2/11/98 4:52 PM                                           48                       Monitor, Wizard, Perception                      GroWeather, Energy, & Health                     WeatherLink Protocol  02-11-98                                 Rev 3.3                                                                        Table of Contents:I. IntroductionII. DefinitionsIII. Pseudo code description of WeatherLink command processing loop.IV. Code illustration of the Communication functions used in the examples.V. Link Types and Revision LevelsVI. Command DescriptionVII. Command SummaryVIII. Illustrated Examples A. Reading Calibrated Data  1. Temperature CAL  2. Humidity CAL  3. Barometer  4. Rain  5. Wind Speed  6. Rain Rate  7. UV MED's B. Using the LOOP command C. Using MDMP command D. Invalid Data values E. Calculated Data values  1. Wind Chill  2. Dew Point  3. Temperature-Humidity Index  4. THSWI  5. Wind Run  6. Degree-Days  7. Solar Energy  8. UV Dose  9. Rain Rate F. CRC Checking G. Reading Hi/Low Times and DatesIX. Memory addresses. A. Monitor, Wizard, and Perception Station B. Monitor, Wizard, and Perception Link C. GroWeather Station D. GroWeather Link E. Energy Station F. Energy Link G. Health Station H. Health LinkAppendices      (Contained in "appendix.txt") A Bar/Power Bit definitions B Control Module communication status codes (AOM Status) C Model Numbers D Power Voltage Codes E THSWI Latitude Codes F Wind Direction Sector Codes G1 GroWeather Alarm Bits G2 ET Status bits G3 Leaf Wetness Data/Status byte in the LOOP packet. E1 Energy Alarm Bits H1 Health Alarm BitsI.   Introduction     This document is a technical description of the softwareinterface to both the Standard WeatherLink, which can connect tothe Monitor, Wizard, and Perception models, and the GroWeatherWeatherLink, the Energy WeatherLink, and the Health WeatherLink.The WeatherLink interprets commands sent by a PC over an RS232Cserial link (8 bits, 1 stop bit, no parity).  The commands are acombination of ASCII and binary data.  The command structure andformat are almost identical for the 4 kinds of WeatherLink, butthe available data and their locations are different.     The diagram below illustrates the relationship between thePC, WeatherLink, and Weather Station.  The sensor image, archiveimage, and the archive memory belong to the WeatherLink.   Asshown in the diagram the PC sends commands and receives data fromthe WeatherLink.  The WeatherLink sends commands and receivesdata from the Weather Station.  Data is contained in both theWeatherLink and the Weather Station.  You will notice you canread data from the WeatherLink faster than the Weather Station.Therefore, if the data exists in the WeatherLink and is beingupdated fast enough for your purposes, read it from theWeatherLink. Study the "Command Processing Loop" carefully tounderstand what is in the WeatherLink and when it is updated."RRD" commands read from the WeatherLink.  "WRD" commands readfrom the Weather Station.  The addresses of the data available inthe WeatherLink and the Weather Station are given in section IX.     cmds                 cmds                    (Monitor Station)PC   ->        Weather    ->     Weather Station  (Wizard Station)               Link                               (Perception Station)     data                 data                    (GroWeather)     <-        .          <-                      (Energy Station)               .                                  (Health Station)               .               sensor image               archive image               archive memory     The Appendices, in the separate file "appendix.txt", containdescriptions of coded numerical values and Bit definitions.     Please note Davis Instruments is not responsible for anydamages your use of this information may cause.  Furthermore, wereserve the right to modify our designs without notice.II.  Definitions     station processor memory - 256 bytes of memory directly          accessible by the station processor, organized into 2          banks of 256 nibbles.     link processor memory - 256 bytes of memory directly          accessible by the link processor, organized into 2          banks of 256 nibbles.     archive memory - 32K of memory where weather data is stored          before downloading to PC.     sensor image - Memory containing the latest data from the          weather station. Part of the link processor memory     archive image - Memory where archive entries are assembled          before being written to the archive memory. Part of the          link processor memoryIII.  Pseudo code description of WeatherLink command processing loop.   All references to Inside temperature apply to Soil temperature       on the GroWeather station.   Items marked (G) are only applicable to the GroWeather station                (E) are only applicable to the Energy Station                (H) are only applicable to the Health Station                (O) are only applicable to the Monitor, Wizard, & Perception                (N) are only applicable to the GroWeather, Energy, & Health        // Initialize the Link chip memory        Set archive interval to be 30 minutes.        Set sample interval to be 20 seconds.        Test archive memory.        If (memory test passes)           Do a beep on the weather station.      /*     Wind speed and wind direction are read and stored in the     sensor image each time around the loop.  Temperature is     read once for every ten wind  speed readings.  Humidity,     Barometer, and Rain are updated every time the sensor image     is updated.      */        while (1) // beginning of command processing loop           GetWindSpeed ();           Test for new Gust Value;           GetWindDirection ();              For every 10 wind speed reads {               read Inside and Outside temperature;               Read Rain Rate (N)               read Solar Rad (N)               read UV Intensity (H)               read Alarm and Control-Module communication status (N)               Check current Outside Temp for new Hi/Low in this period                And record in archive image.               Check for new Hi Rain Rate (N)               Check for new Hi Solar Rad (H)               Check for new Hi UV Intensity (H)               }           if (in loop mode)              Transmit copy of sensor image.           if (time to sample sensor image)  Sample sensor image:               Add current data values for variables that are averaged:                Inside & Outside Temperature                Wind Speed                Solar Radiation (N)                UV Intensity (H)               If wind speed is > wind threshold (0), then add one to the                 direction bin corresponding to the current wind direction               Read other values not read in above: (GetRBH)                read Rain                read Barometer                read outside Humidity                read inside Humidity (H) (O)                read Wind Run (G) (E)                read Total ET (G)                read Total Growing Degree-Days (G)                read Total Heating, Chill, Cooling, & THI Degree-Days (E)                read Total Solar Energy (G) (E)                read Bar and Power status bits (N)                read Leaf Wetness value (G)                read Rain Cal (N)            Every 18 seconds                collect data from the ET Sensors to calculate hourly ET (G)              if ( Time to check archive clock )      // Every 16 seconds.              {              Call GetRBH as above (N)              if (it is time to calculate ET) (G)               calculate ET and store in archive Image (G)              if (lastArchiveTime - currentTime >= archiveInterval)               {               // Make sure the sensor image is up to date.               Call GetRBH as above (O)               // Fill in the archive image before archiving               // Hi and Low Outside temps are already set (see above)               // The following reads are stored in the sensor image.               Read current barometric pressure.               Read current outside humidity.               Read the current Leaf Wetness Value (G)               Read current inside humidity. (H) (O)                // The following are incremental values derived from the                 difference between the current value and the previous                 value               Calculate rain in period.               Calculate Wind Run in Period (G) (E)               Calculate Growing Degree Days in period (G)               Calculate Heating Degree Days in period (E)               Calculate Wind Chill Degree Days in period (E)               Calculate Cooling Degree Days in period (E)               Calculate Temp-Hum-Index Degree Days in period (E)               Calculate Solar energy in Period (G) (E)               Calculate UV Dose in period (H)                // The following are average values are derived by                 dividing an accumulator by the number of samples taken               Calculate average Inside temperature for period.               Calculate average Outside temperature for period.               Calculate average wind speed for period.               Calculate Average Solar Rad for period. (N)               Calculate Average UV Intensity (H)               Calculate dominant wind direction for period               Finally, read the primary power voltage code from the station (G) (E)               Write data to archive memory.               Update last archive time:        (O) Set the "last time" to the current station time        (N) set the "last time" so that the next archive happens on the hour               Clear Hi/Low entries in Archive image               Clear Accumulators and sample count               Set the "Previous" registers to the current values               Reset ET data to FFFF (G)               } // create archive record              } // 16 second polling           if (A command is available)              Process the command.           }   // End while (1)...IV.  Code illustration of the Communication functions used in the examples.     The functions "put_serial_char()", "put_serial_string()","send_unsigned()", "get_serial_char()" "get_acknowledge()","fill_buffer()", and "fill_crc_buffer()" are used in the examplesin the next sections to send commands and data to theWeatherLink. You must provide these functions. The illustrationsgiven here are for reference.     All of the example code included with this programmer'sreference disk assumes that the "int" data type is a 16 bit (2byte) signed number. On some machines you may be required to usethe "short int" data type. In most cases, the "char" data type isexplicitly stated as being unsigned. In a few places (i.e. HumCal on GroWeather, etc.) a one byte number needs to be treated asa signed value.     "receive_buffer" is an external (global) array of unsignedchar that is at least 32K in length (the size of the SRAM).     /* +----------------------------------------------------------+         Output a character to current serial port.     */      int put_serial_char (unsigned char c)      {        // write character c to the current serial port      }      /* +-------------------------------------------------------------+       Output a string to current serial port.      */      int put_serial_string (char *s)      {        int i;        for (i = 0; s [i] != '\0'; i++)            put_serial_char (s [i]);      }     /* +-------------------------------------------------------------+       Outputs the unsigned integer (16 bits) to the current       serial port. assumes "Intel" least significant byte first.     */      int send_unsigned (unsigned d)      {        unsigned char *cp;        cp = (unsigned char *) &d;        put_serial_char (*cp);     // Low order byte        put_serial_char (*(cp+1)); // Hi order byte      }     /* +-------------------------------------------------------------+      Read a character from the current serial port.      */      int get_serial_char ()      {          int c          // read a character from the current serial port and assign it to c          // If there has been a timeout or some other error, set c to a negative          // value that indicates the type of error          return c;      }     /* +-------------------------------------------------------------+      anticipates an ACK  to verify that the link has understood      the command it has just received. If the character received      is not ACK, or there has been some serial error (i.e. timeout),      return an error value, otherwise return OK      */      int get_ acknowledge ()      {          int c          c = get_serial_char();          if (c == ACK)             return OK;          else if (c < 0)              // serial error             return serial_error_code;          else                         // did not receive ACK             return c      }     /* +------------------------------------------------------------------+       Read a series of bytes from the current serial port and store them in       the receive buffer.      */        int fill_buffer (int n)        {           int i;           for (i=0; i<n; i++)              {              c = get_serial_char();              if (c >= 0)                 recieve_buffer[i] = c;              else                 // there has been an error getting the next character                 return serial_error_code;              }           return OK;   // we have read in n bytes        }     /* +------------------------------------------------------------------+       Read a series of bytes from the current serial port, perform a CRC       check on the data, and store them in the receive buffer.      */        int fill_crc_buffer (int n)   // n includes the CRC bytes        {           int i;           int crc = 0;               // initialize the CRC checksum to 0           for (i=0; i<n; i++)              {              c = get_serial_char();              if (c >= 0)                 {                 recieve_buffer[i] = c;   // Store the data                 crc =  crc_table [(crc >> 8) ^ c] ^ (crc << 8);                 }              else                 // there has been an error getting the next character                 return serial_error_code;              }           if (crc == 0)              return OK;         // we have read in n bytes and the CRC is OK           else              return CRC_ERROR;  // The CRC check failed.        }V.   Link Types and Revision Levels      WeatherLink hardware modules can be classified by thestation model they are intended for, and by revision level.      There is one link type for the Monitor, Wizard, andPerception stations. The WeatherLink logs all the sensors foreach of these stations, Any sensor or calculated value that thestation does not support will be filled with the appropriateInvalid Data value (see below).      The GroWeather, Energy, and Health stations are substatialydifferent from each other, both in the sensors supported, and inthe types of calculated values. The corresponding Links aretherefore also different. The primary difference, from theprogrammer's viewpoint, is the memory locations of the desireddata which can be found in the corresponding memory address tablebelow.      There are 3 different revision levels of WeatherLinkmodules. These represent changes and upgrades made over the lifeof the product.      The Rev C (and earlier) level is only used forMonitor/Wizard/ Perception Links. This version does not supportthe use of SR modems for communicating with the PC at distancesgreater than 50 feet      The only difference between Monitor Links made at Rev D andRev C is that the Rev D WeatherLinks support the use of SRmodems. The GroWeather, Energy, and Health Links are alsomanufactured at the Rev D level.      The Rev E Link implements a slightly differentcommunication protocol between it and the PC to provide greatercommunication reliability. This consists, primarily, of extra CRCinformation that must be provided by the PC so that theWeatherLink can verify every command. Also, ALL data returned bythe WeatherLink has a CRC code included, not just LOOP, MDMP, andSRD data. This means that the Rev E link is software incompatiblewith previous versions.  The actual commands used to program aRev E link, however, are the same as the corresponding Rev Dlink. Two additional commands are added to allow Rev E links tooperate with the Rev D communication protocol ("Rev D EmulationMode").      In addition, the GroWeather and Energy versions of the RevE link implements a simple powersavings procedure with the AOMfor use with solar powered radio installations.      At this time only the GroWeather link is available in Rev Eversions. Contact Davis' technical support atsupport@davisnet.com for information on getting Energy or Healthversions of the Rev E link if required.      Most of the included software examples assume you are NOTusing a Rev E WeatherLink. Please read the "CRC Checking"(section VIII-F) for information on how to generate the necessaryCRC codes. Or, read the description of the "CRC0" command for howto disable CRC command checking.VI.  Command Description      Commands must be in upper case and terminated with acarriage return (0dh). Do not insert spaces between binary dataarguments. If an argument description uses the character '|' thenone byte of data is to be formed from the 4 bit values on eitherside. For example: "bank | n-1" becomes the single byte "0x13"where bank = 1 and n = 4     Rev E links must also include a two byte CRC code with eachcommand so that the WeatherLink can verify correct transmission.The CRC code is transmitted BEFORE the command. It is possible toprogram Rev E links to use the Rev D communication protocol, ifdesired.     If a command is understood, an ASCII 6 (0x06) (ACK) isreturned (before any returned data).  If the command was notunderstood, an ASCII 33 (0x21) (!) is returned. Note that thisimplies that the command passed its CRC check sum if the link isa Rev E. For Rev E links, if the command does not pass its CRCcheck sum, then an ASCII 24 (0x18) (CAN) is returned.     Some commands return a data stream and a CRC check sum.  Thegenerator polynomial for the check sum is x^16 + x^12 + x^5 + 1(CRC-CCITT backward).     All binary data is transferred in "Intel" format: leastsignificant byte first. In addition, multi-nibble data values onthe station are stored least significant nibble first. This doesnot make a difference when you look at byte sized pieces ofmemory, since the Link will correctly align the nibbles whensending byte data.     Use the appropriate table in section IX to determine thememory locations and sizes for the data you would like to operateon. If you read data with an odd length, the upper nibble of thelast (most significant) byte will be set to 0, not sign extended.If you write data with an odd length, the upper nibble of thelast byte will be ignored. Sign extension is taken care of fordata in the sensor image and archive image on the link.     The commands "RRD" and "RWR" operate on the link processormemory. These commands execute faster than the "WRD" and "WWR"commands which operate on the station processor memory.     The MDMP command is only available on the GroWeather,Energy, and Health Links.     The CRC0 and CRC1 commands are only available on Rev E links.DMP     Transfer the contents of the archive memory beginning ataddress 0 using the XMODEM CRC protocol.  This command can beused with any standard communication package (i.e. Procomm). Thearchive memory is organized as a set of equal sized archiverecords. The appropriate link memory addresses section contains adescription of the size and structure of an archive image, whichis the same as the format of the archive records.i.e.put_serial_string ("DMP");put_serial_char (0x0d);MDMP     Dumps an image of the current contents of the Stationprocessor memory to the serial port. This typically takes around6 seconds and is much faster than requesting lots of piecesseparately. 256 bytes are sent along with a 2 byte CRC check sumin a similar fashion to the SRD command below. The memory tablesbelow show how this data is organized. See "Using the MDMPcommand" (section VIII-C) below for how to do the appropriate bitmasking and shifting to extract data from the received data.     NOTE: MDMP uses archive memory 7F00-7FFF to record thememory image from the station before sending it on the computer.This archive memory is not available for normal archive purposes,but the last MDMP can be read by using the SRD command, or theDMP command.     The MDMP command is only available on the GroWeather,Energy, and Health Links.put_serial_string ("MDMP");put_serial_char (0x0d);LOOP 65536-n      Send 'n' packets of weather data (sensor image) from theWeatherLink.  The first byte (01) signals the start of a newblock.  This is followed by binary data (15 bytes for theMonitor/Wizard/Perception, 33 bytes for the GroWeather, 27 bytesfor the Energy, or 25 bytes for the Health) and a 2 byte CRCcheck sum.  The CRC check sum is calculated on the data only. The"start of block" byte is not included in the CRC calculation. See"CRC Checking" (section VIII-F) below for how to use the CRCinformation.Monitor, Wizard, and Perception Sensor Image:     start of block                     1 byte     inside temperature                 2 bytes     outside temperature                2 bytes     wind speed                         1 byte     wind direction                     2 bytes     barometer                          2 bytes     inside humidity                    1 byte     outside humidity                   1 byte     total rain                         2 bytes     not used                           2 bytes     CRC checksum                       2 bytes                                       --------                                       18 bytesGroWeather Sensor Image:     start of block                     1 byte     Archive memory address of       the next Archive record          2 bytes     Bar/Power status bits              1 byte     See Appendix A     Soil temperature                   2 bytes     Air temperature                    2 bytes     wind speed                         1 byte     wind direction                     2 bytes     barometer                          2 bytes     Rain Rate                          1 byte     outside humidity                   1 byte     total rain                         2 bytes     Solar Radiation                    2 bytes     Total Wind Run                     3 bytes     Total ET                           2 bytes     Total Degree-Days                  3 bytes     Total Solar Energy                 3 bytes     Alarm Bits and AOM status          3 bytes    See Appendices G1 & B     Leaf Wetness Data and status       1 byte     See Appendix G3     CRC checksum                       2 bytes                                       --------                                       36 bytesEnergy Sensor Image:     start of block                     1 byte     Archive memory address of       the next Archive record          2 bytes     Bar/Power status bits              1 byte     See Appendix A     Inside temperature                 2 bytes     Outside temperature                2 bytes     wind speed                         1 byte     wind direction                     2 bytes     barometer                          2 bytes     Rain Rate                          1 byte     outside humidity                   1 byte     total rain                         2 bytes     Solar Radiation                    2 bytes     Total Wind Run                     3 bytes     Total Solar Energy                 3 bytes     Alarm Bits and AOM status          3 bytes    See Appendices E1 & B     CRC checksum                       2 bytes                                       --------                                       30 bytesHealth Sensor Image:     start of block                     1 byte     Archive memory address of       the next Archive record          2 bytes     Bar/Power status bits              1 byte     See Appendix A     Inside temperature                 2 bytes     Outside temperature                2 bytes     wind speed                         1 byte     wind direction                     2 bytes     barometer                          2 bytes     Rain Rate                          1 byte     total rain                         2 bytes     Solar Radiation                    2 bytes     Inside humidity                    1 byte     outside humidity                   1 byte     UV Intensity                       1 bytes     UV Dose                            2 bytes     Alarm Bits and AOM status          3 bytes    See Appendices H1 & B     CRC checksum                       2 bytes                                       --------                                       28 bytesExample:      put_serial_string ("LOOP");      send_unsigned ((unsigned) (65536 - n));      put_serial_char (0x0d);     See "Using the LOOP command" (section VIII-B) for examplesof how to extract data from a Loop imageRRD bank address n-1     Read 'n' nibbles from the link processor memory from'address' in bank 'bank'. n = 1...8     On Rev E links, the data returned will also include a 2 byteCRC code. See "CRC Checking" (section VIII-F) for how to use theCRC information.put_serial_string ("RRD"); // Send the command.put_serial_char (bank);    // bank = 0 or 1.put_serial_char (address); // address = 0..FFput_serial_char (n - 1);   // Get n nibbles..put_serial_char (0x0d);    // Send CR...RWR bank | n-1  address data     Write 'n' nibbles of 'data' into the link processor memorybeginning at 'address' in bank 'bank.'  n = 1..8put_serial_string("RWR");  // Send the command.put_serial_char(0x13);     // bank = 1  n = 4put_serial_char(0x54);     // address = 54h (Last Archive Time)send_unsigned (0);         // write 0.put_serial_char(0x0D);     // Send CR...SRD address n-1     Read 'n' bytes of archive memory beginning at 'address.'Both 'address' and 'n-1' are 16 bit numbers between 0 and 0x7FFF.A two byte CRC checksum is sent at the end of the data stream.See "CRC Checking" (section VIII-F) for how to use the CRCinformation.put_serial_string ("SRD"); // Send the command.send_unsigned (address);   // Start sending from address.send_unsigned (n-1);       // Send n bytes.put_serial_char (0x0d);    // Send CR...SWR address data     Write 'data' (one byte) to 'address' in archive memory.'address' is a 16 bit number between 0 and 0x7FFF.put_serial_string ("SWR"); // Send the command.send_unsigned (address);   // Send two byte address.put_serial_char (data);    // Send byte of data.put_serial_char (0x0d);    // Send CR...WRD n | bank address     Read 'n' nibbles of data from the station processor memorystarting at 'address' in bank 'bank'. For bank 0 use 'bank' = 2for bank 1 use 'bank' = 4. A maximum of 8 nibbles can be read.     On Rev E links, the data returned will also include a 2 byteCRC code. See "CRC Checking" (section VIII-F) for how to use theCRC information.put_serial_string ("WRD"); // Send read command.put_serial_char (0x44);    // read 4 nibbles from bank 1.put_serial_char (0xB0);    // Read beginning at B0h.                           // (Period Length on GroWeather)put_serial_char (0x0D);    // Send CR...WWR n | bank address data     Write 'n' nibbles of data to the station processor memorystarting at 'address' in bank 'bank'. For bank 0 use 'bank' = 1for bank 1 use 'bank' = 3. A maximum of 8 nibbles can be written.put_serial_string ("WWR"); // Send write command.put_serial_char (0x31);    // n = 3, writing to bank 0.put_serial_char (0x34);    // Write to AAh.=                           // Daily ET Alarm Threshold on GroWeathersend_unsigned (0x0FFF);    // Send 4095 or 0FFFh.put_serial_char (0x0D);    // Send CR...SAP n     Set the archive interval to 'n' minutes.  'n' is one byte.put_serial_string ("SAP");      // Send the command.put_serial_char (n);            // Set interval to 'n' minutes.put_serial_char (0x0D);          // Send CR...SSP 256-n     Set the time interval between samples of the sensor image inthe WeatherLink to 'n' seconds.  'n' is one byte.  At eachsampling instant the sensor image is sampled and variables thatare "averaged" are accumulated.  The maximum number of samples inan interval is 255.put_serial_string ("SSP");      // Send the command...put_serial_char ((unsigned char) (256 - newSamplePeriod));put_serial_char (0x0D);          // Send CR...STOP     Tell the WeatherLink to stop it's constant updating ofweather information from the weather station.  The command alsodisables the archive timer on the WeatherLink.  Stopping weatherstation reads allows the WeatherLink to process commands morequickly.put_serial_string ("STOP");put_serial_char (0x0d);START     Tell the WeatherLink to begin "reading" the weather stationand archiving weather information. This command is only needed ifyou have previously sent a STOP command.put_serial_string ("START");put_serial_char (0x0d);ARC     Force a write to archive memory.put_serial_string ("ARC");put_serial_char (0x0d);IMG     Force a sampling of the sensor image.put_serial_string ("IMG");put_serial_char (0x0d);DBT     Disable the archive timer.put_serial_string ("DBT");put_serial_char (0x0d);EBT     Enable the archive timer.put_serial_string ("EBT");put_serial_char (0x0d);CRC0     Disable CRC command checking for Rev E links. This commandwill set a Rev E WeatherLink into Rev D emulation mode. This meansthat CRC check sums are not required (not allowed either!) forcommands sent to the WeatherLink. Also, only LOOP, MDMP, and SRDdata from the WeatherLink include CRC check sums.     If CRC command checking is enabled when you issue thiscommand, you MUST include the CRC code. CRC command checking isonly disabled AFTER the command is received and validated. The CRCcode is given below.     CRC0 command is only available on Rev E Links.     Note, the last character of the command is an ASCII zerocharacter.put_serial_char (44);            // CRC code first byte (decimal)put_serial_char (247);           // CRC code second byte (decimal)put_serial_string ("CRC0");      // The fourth character is a zeroput_serial_char (0x0d);CRC1     Enable CRC command checking for Rev E links. This command willreturn a Rev E WeatherLink to normal operation. This means that CRCcheck sums ARE required for commands sent to the WeatherLink. Also,ALL data from the WeatherLink includes CRC check sums.     If CRC command checking is disabled when you issue thiscommand, you MUST NOT include the CRC code. CRC command checking isonly enabled AFTER the command is received.     CRC1 command is only available on Rev E Links.put_serial_string ("CRC1");put_serial_char (0x0d);VII. Command SummaryDMP    Transfer the contents of the archive memory using the XMODEMCRC protocol.MDMP    Dumps an image of Station processor memory to the serialport. This command is only available on the GroWeather, Energy,and Health Links.LOOP 65536-n    Send 'n' packets of weather data (sensor image) from theWeatherLink.RRD bank address n-1    Read 'n' (1-8) nibbles from the link memory from 'address' in'bank'.RWR bank | n-1  address data    Write 'n' (1-8) nibbles of 'data' into the link memory at'address' in 'bank.'SRD address n-1    Read 'n' bytes of archive memory beginning at 'address.' Both'address' and 'n-1' are 16 bit numbers.SWR address data    Write 'data' (one byte) to 'address' (2 bytes) in archivememory.WRD n | bank address    Read 'n' (1-8) nibbles of data from the station memorystarting at 'address'  For a bank 0 use 'bank' = 2, for a bank 1use 'bank' = 4.WWR n | bank address data    Write 'n' (1-8) nibbles of data to the station memorystarting at 'address' For bank 0 use 'bank' = 1, for bank 1 use'bank' = 3.SAP n    Set the archive interval to 'n' minutes.  'n' is one byte.SSP 256-n    Set the time interval between samples of the sensor image to'n' seconds.  'n' is one byte. The maximum number of samples inan interval is 255.STOP    Tell the WeatherLink to stop updating the sensor image andarchiving.START    Tell the WeatherLink to begin updating the sensor image andarchiving data. This command is only needed if you havepreviously sent a stop command.ARC    Force a write to archive memory.IMG    Force a sampling of the sensor image.DBT    Disable the archive timer.EBT    Enable the archive timer.CRC0    Disable CRC command checking for Rev E links.CRC1    Enable CRC command checking for Rev E links.VIII.     Illustrated ExamplesA.   Reading Calibrated Data     Most of the data values displayed on the Station's LCD havebeen calibrated. The term "calibrated" here means a user suppliedoffset has been added to the "raw" number read by the weatherstation. The data stored in "XxxxDta" memory locations (i.e.Tp1Dta, SpdDta, etc. See Section IX) are uncalibrated. This goesfor LOOP data, and archived data as well. Thus, you may have tocalibrate the data you read off the station (or link). You shouldtake the time to read the station's user manual to familiarizeyourself with some of the Cal number basics.     There are several approaches to how to implement Calnumbers. 1: Your program takes input from the user and recordsthe Cal numbers in a configuration file on the PC. Optionally theprogram could set the station's Cal numbers at the same time sothey agree. 2. Or, the user could set the Cal number on thestation (either manually or with another program) and yourprogram reads the required Cal numbers off the station.     Always check sensor values for invalid data BEFORE applyingcalibration numbers. Do not apply a calibration number to aninvalid data value. See "Invalid Data values" below for moreinformation.     The rest of this section will explain how to use the secondapproach. The following Cal Numbers are explained: 1 Temperature,2 Humidity, 3 Barometer, 4 Rain, 5 Wind Speed, 6 Rain Rate, and 7UV MED's.1.   Temperature CAL     Each of the two temperature sensors has a separate Calnumber. Only the current station data and all Linkdata--including the sensor image (LOOP) and archived data--needsto be calibrated. Hi/Low data on the station and "derived" data(i.e. Dewpoint, Wind chill, and THI) already have the Cal numbertaken into account. The value at the Cal number location is anoffset (in Degrees F*10) to be added to the data. Note: thisvalue is a signed data value.     Reading Inside Temp on the Monitor (or Wizard orPerception):put_serial_string ("WRD"); // Send read command.put_serial_char (0x44);    // read 4 nibbles from bank 1.put_serial_char (0x52);    // Read beginning at 52h.                           // (Inside Temp Cal on Monitor)put_serial_char (0x0D);     // Send CR...get_acknowledge();         // verify that the command wasreceived and got ACKfill_buffer(2);            // get the returned data (in bytes)InTempCAL = *((int *) receive_buffer)                           // read the Cal number out of thebufferput_serial_string ("WRD"); // Send read command.put_serial_char (0x44);    // read 4 nibbles from bank 1.put_serial_char (0x30);    // Read beginning at 30h.                           // (Inside Temp Data on Monitor)put_serial_char (0xd);     // Send CR...get_acknowledge();         // verify that the command wasreceived and got ACKfill_buffer(2);            // get the returned data (in bytes)InTemp = *((int *) receive_buffer)                           // read the Raw Temperature out of thebuffer// Verify that the Raw Temperature is not an invalid data valuebefore// applying the cal number. See "Invalid Data values" below for// more information.InTemp = InTemp + InTempCal  // InTemp is now Calibrated     Reading Outside Temp on the Energy Station:put_serial_string ("WRD"); // Send read command.put_serial_char (0x34);    // read 3 nibbles from bank 1.put_serial_char (0x45);    // Read beginning at 45h.                           // (Outside Temp Cal on Energy)put_serial_char (0xd);     // Send CR...get_acknowledge();         // verify that the command wasreceived and got ACKfill_buffer(2);            // get the returned data (in bytes)     // Note that the upper nibble of the last byte will be set     //  to 0 Also, even though the address was odd, the nibbles      //  are aligned so that the addressed nibble is the least      //  significant nibble of the first byteOutTempCAL = *((int *) receive_buffer)                           // read the Cal number out of thebufferif(OutTempCAL > 2048)      // Check for negative numbers   {   OutTempCAL = OutTempCAL - 4096;                           // convert a 3 nibble 2's complementnegative                           // number into a "real" negativenumber   }put_serial_string ("WRD"); // Send read command.put_serial_char (0x34);    // read 3 nibbles from bank 1.put_serial_char (0x36);    // Read beginning at 36h.                           // (Outside Temp Data on Energy)put_serial_char (0xd);     // Send CR...get_acknowledge();         // verify that the command wasreceived and got ACKfill_buffer(2);            // get the returned data (in bytes)OutTemp = *((int *) receive_buffer)                           // read the Raw Temperature out of thebufferif(OutTemp > 2048)         // Check for negative numbers   {   OutTemp = OutTemp - 4096; // convert a 3 nibble 2's complementnegative                             //  number into a "real" negativenumber   }// Verify that the Raw Temperature is not an invalid data value// before applying the cal number. See "Invalid Data values" // below for more information.OutTemp = OutTemp + OutTempCAL  // OutTemp is now Calibrated2.   Humidity CAL     Only Outside Humidity on the GroWeather, Energy, Health,and on the Monitor Rev C or later have a CAL number. It consistsof either a signed 2-byte number (on the Monitor) or a signed 1-byte number (on the other stations) to be added to the currentstation data and Link data including the sensor image (LOOP) andarchived data. Hi/Low and "Derived" values (dewpoint, THI, etc.)already take the Cal number into account.     After adding the Cal number to the data, you will need tomake sure that the result is in the range 1 to 100. If not, thenclip the data at these boundaries.Reading Outside Hum on the Monitor:put_serial_string ("WRD"); // Send read command.put_serial_char (0x44);    // read 4 nibbles from bank 1.put_serial_char (0xDA);    // Read beginning at DAh.                           // (Outside Hum Cal on Monitor)put_serial_char (0xd);     // Send CR...get_acknowledge();         // verify that the command wasreceived and got ACKfill_buffer(2);            // get the returned data (in bytes)OutHumCAL = *((int *) receive_buffer)                           // read the Cal number out of thebufferput_serial_string ("WRD"); // Send read command.put_serial_char (0x24);    // read 2 nibbles from bank 1.put_serial_char (0x98);    // Read beginning at 98h.                           // (Outside Hum Data on Monitor)put_serial_char (0xd);     // Send CR...get_acknowledge();         // verify that the command wasreceived and got ACKfill_buffer(1);            // get the returned data (in bytes)OutHum = *((unsigned char *) receive_buffer)                           // read the Raw Humidity out of thebufferif (OutHum == 128)         // if the raw sensor value is 128,then either the   return HUM_ERROR_VALUE  // hum sensor is not working or not attached.OutHum = OutHum + OutHumCal                        // OutHum is now Calibrated, but possiblyout of rangeif (OutHum >100)   OutHum = 100;else if (OutHum < 1)   OutHum = 1;             // OutHum has been clipped to therange 1 - 100.3.   Barometer     The weather station measures the absolute atmosphericpressure. In order to convert this to a Standard Barometricpressure, the station subtracts a calibration offset value. Thisis determined by having the user enter the desired Barometricreading (derived from some other source i.e. airport, newspaperetc.). The station stores the difference between the desiredreading and the actual reading in the "StnDrd" memory register.This calibration number must be subtracted from the currentStation data and Link data including the sensor interface (LOOP)and archived data.     Note: since at higher elevations the absolute pressuredecreases, the barometric pressure is generally larger than theatmospheric pressure and since the calibration number issubtracted from the data, it is generally a negative number. Itis 2 bytes longReading Barometer on the Monitor (or Perception):put_serial_string ("WRD"); // Send read command.put_serial_char (0x44);    // read 4 nibbles from bank 1.put_serial_char (0x2C);    // Read beginning at 2Ch.                           // (Barometer Standard on Monitor)put_serial_char (0xd);     // Send CR...get_acknowledge();         // verify that the command wasreceived and got ACKfill_buffer(2);            // get the returned data (in bytes)BarCAL = *((int *) receive_buffer)   // read the Cal number outof the bufferput_serial_string ("WRD"); // Send read command.put_serial_char (0x44);    // read 4 nibbles from bank 1.put_serial_char (0x00);    // Read beginning at 00h.                           // (Barometer Data on Monitor)put_serial_char (0xd);     // Send CR...get_acknowledge();         // verify that the command wasreceived and got ACKfill_buffer(2);            // get the returned data (in bytes)Barometer = *((int *) receive_buffer)                           // read the Raw Barometer out of thebufferBarometer = Barometer - BarCal  // Barometer is now Calibrated4.   Rain     Rain data on all stations and links are stored in "unit-less" clicks. The RainCal number tells how many clicks are in aninch of rain. The most common numbers are: 10 for the 0.1" raincollector, 100 for the 0.01" rain collector, and 127 for the0.2mm rain collector.Reading Yearly Rain on the Monitor (or Wizard):put_serial_string ("WRD"); // Send read command.put_serial_char (0x44);    // read 4 nibbles from bank 1.put_serial_char (0xD6);    // Read beginning at D6h.                           // (Rain Cal on Monitor)put_serial_char (0xd);     // Send CR...get_acknowledge();         // verify that the command wasreceived and got ACKfill_buffer(2);            // get the returned data (in bytes)RainCAL = *((int *) receive_buffer)   // read the Cal number outof the bufferput_serial_string ("WRD"); // Send read command.put_serial_char (0x44);    // read 4 nibbles from bank 1.put_serial_char (0xCE);    // Read beginning at CEh.                           // (Yearly Rain Data on Monitor)put_serial_char (0xd);     // Send CR...get_acknowledge();         // verify that the command wasreceived and got ACKfill_buffer(2);            // get the returned data (in bytes)RainClicks = *((int *) receive_buffer)                           // read the Raw Rain out of the bufferYearRain = (float) RainClicks / (float) RainCal                           // Make sure this is a floating pointcalculation                           // YearRain is now Calibrated inInches     Reading Daily Rain on the GroWeather Station:put_serial_string ("WRD"); // Send read command.put_serial_char (0x44);    // read 4 nibbles from bank 1.put_serial_char (0xCF);    // Read beginning at CFh.                           // (Rain Cal on GroWeather)put_serial_char (0xd);     // Send CR...get_acknowledge();         // verify that the command wasreceived and got ACKfill_buffer(2);            // get the returned data (in bytes)RainCAL = *((int *) receive_buffer)                           // read the Cal number out of thebufferput_serial_string ("WRD"); // Send read command.put_serial_char (0x34);    // read 3 nibbles from bank 1.put_serial_char (0xC9);    // Read beginning at C9h.                           // (Daily Rain Data on GroWeather)put_serial_char (0xd);     // Send CR...get_acknowledge();         // verify that the command wasreceived and got ACKfill_buffer(2);            // get the returned data (in bytes)     // Note that the upper nibble of the last byte will be set     //  to 0 Also, even though the address was odd, the nibbles      //  are aligned so that the addressed nibble is the least      //  significant nibble of the first byteRainClicks = *((int *) receive_buffer)  // read the Raw Rain out     // of the buffer. Since Rain is unsigned, we do not need to      // Check for negative numbersDailyRain = (float) RainClicks / (float) RainCal                   // Make sure this is a floating point calculation                   // YearRain is now Calibrated in Inches5.   Wind Speed     While all of the stations have a Wind Speed cal number,there are very few situations where it is useful. Primarily ifyou do not attach a Davis anemometer, or if you are not measuringwind speed. The formula for Wind Speed in MPH is "SpdDta" * 1600/ "SpdCal". Since, the default Cal number is 1600, you can justread "SpdDta" in MPH directly without any further calculation.     The Speed Cal only effects the LCD display of the currentand Hi wind speed. It is not used in any "Derived" calculations(i.e. Wind Chill, THSWI, or ET).     Setting the Cal Number to 3600 will cause the display to bein Hz. That is it will show the number of anemometer revolutionsper second.6.   Rain Rate     Rain Rate is only available on the GroWeather, Energy, andHealth stations. There are two different ways that the Rain Ratedata is stored. On the Links (both Sensor Image and archiveddata), the rate is stored in inches per hour times 10. Thecurrent station rain cal is used to calculate this value. SeeBelow.     On the Station, the current rain rate (and the Hi rate onthe Health station) is stored as "The number of half-secondsbetween the last rain click and the previous rain click. Giventhe information above about the station's rain Cal number, theformula for converting raw rate data is:Rate(in/hr) = 7200(1/2 sec/hr) / ("RateDta"(1/2sec/clicks)*                                  "RainCal"(clicks/In))7.   UV MED's     The UV MED's Cal number is designed to allow the UV MED'sdisplays to be adjusted for different skin types. UV Intensitydata is stored in tenths of an Index, but can be displayed inboth Index and MED's per Hour. UV Doses are stored as "Standard"MED's and always displayed in MED's. The UV MED's Cal number is anumber between 1 and 14 which represents a multiplication factorof 0.1 to 1.4.  The "Standard" Cal number is 10, representing amultiplication factor of 1.0.     The formula for converting UV Index to "Standard" MED's is:UV_MEDs = (3/7) * UV_Index     The formula to convert "Standard" MED's to calibrated MED'sis:Caled_MEDs = Standard_MEDs * "UVCal" / 10Note: Make sure that you perform both of the above conversionsusing floating point arithmetic!B.   Using the LOOP command     The LOOP command is the preferred way to acquire real timeupdates of weather data. The data sent in a LOOP packet is thedata from the Link's Sensor interface. The pseudo-codedescription of the link processing loop above describes how oftenthis data is updated from the station. The answer to the question"How often is the data updated?" in the FAQ contains some usefulapproximate timing figures. LOOP data is also CRC checked (Seebelow for how to implement CRC Checking).     Assuming that you want a virtually continuous stream of looppackets, one approach is to ask for a large number (say 1000) ofpackets in one LOOP command, another approach is to ask for a fewpackets (5-10) in one LOOP command and repeat the request whenthey have arrived.  In either case there is the possibility thatmissed characters or other communication difficulties may causethe receiver to become unsynchronized with the link as to wherethe data packets begin. If this happens you should first stop thestream of LOOP data by sending another valid command (like a readof Link memory). Then clear your receive buffer and send the LOOPcommand again.     Another feature of the LOOP command, only available on theGroWeather, Energy, and Health stations, is the ability tomonitor the archiving of data. On these stations, one of the datafields is the "NewPtr" that indicates the SRAM address where thenext archive record is to be written. If this number changesduring the course of reading LOOP packets, you know that thestation has created a new archive record. This feature is used inthe "Strip Charts" in the GroWeather, Energy, and Health softwareto keep the PC database current with the archive memory.     The following examples show how to extract data from a databuffer filled with LOOP data. See above for a description offill_crc_buffer() and see below for how CRC checking is done.     Example of reading a Monitor Sensor Image. (reading a Wizardor a Perception is the same only omitting the fields of non-existing sensors).put_serial_string ("LOOP");send_unsigned ((unsigned) (65535));   // request 1 LOOP packetput_serial_char (0x0d);get_acknowledge();         // verify that the command wasreceived and got ACKheader = get_serial_char();    // This should be the block headerbyteif (header != 1) { error = 1;}                        //  If the header byte is not 1 thenthere is an error// assuming there is no error ...CRC_Error = fill_crc_buffer(17);  // 15 data bytes + 2 CRC bytes.                                  // Header Byte is not includedin CRC check// assuming there is no CRC error, the data is stored inrecieve_buffer ...inside_temperature =  *((int *)(receive_buffer+0));outside_temperature =  *((int *)(receive_buffer+2));wind_speed =  *((unsigned char *)(receive_buffer+4));wind_direction =  *((int *)(receive_buffer+5));barometer =  *((int *)(receive_buffer+7));inside_humidity = *((unsigned char *)(receive_buffer+9));outside_humidity = *((unsigned char*)(receive_buffer+10));rain =  *((unsigned *)(receive_buffer+11));     Example of reading a GroWeather sensor imageput_serial_string ("LOOP");send_unsigned ((unsigned) (65535));   // request 1 LOOP packetput_serial_char (0x0d);get_acknowledge();         // verify that the command wasreceived and got ACKheader = get_serial_char();    // This should be the block headerbyteif (header != 1) { error = 1;}            //  If the header byte is not 1 then there is an error// assuming there is no error ...CRC_Error = fill_crc_buffer(34);  // 32 data bytes + 2 CRC bytes.                           // Header Byte is not included in CRC check// assuming there is no CRC error, the data is stored inreceive_buffer ...New_pointer = *((unsigned int *)(receive_buffer));bar_power_flag  =  *(( unsigned char *)(receive_buffer+2));soil_temperature =  *((int *)(receive_buffer+3));air_temperature =  *((int *)(receive_buffer+5));wind_speed =  *((unsigned char *)(receive_buffer+7));wind_dir =  *((int *)(receive_buffer+8));barometer =  *((int *)(receive_buffer+10));rain_rate = *((unsigned char *)(receive_buffer+12));outside_humidity = *((unsigned char*)(receive_buffer+13));rain =  *((unsigned *)(receive_buffer+14));solar_rad =  *((int *)(receive_buffer+16));wind_run = *((unsigned char *) (recieve_buffer+18)) +            *((unsigned char *) (recieve_buffer+19))*256 +            *((unsigned char *) (recieve_buffer+20))*65536ET = *((unsigned char *) (recieve_buffer+21))ET_Flags = *((unsigned char *) (recieve_buffer+22))Deg_Days = *((unsigned char *) (recieve_buffer+23)) +            *((unsigned char *) (recieve_buffer+24))*256 +            *((unsigned char *) (recieve_buffer+25))*65536Energy = *((unsigned char *) (recieve_buffer+26)) +            *((unsigned char *) (recieve_buffer+27))*256 +            *((unsigned char *) (recieve_buffer+28))*65536Alarm_Flags = *((unsigned char *) (recieve_buffer+29)) +            *((unsigned char *) (recieve_buffer+30))*256 +            (*((unsigned char *) (recieve_buffer+31)) &            0x0F)*65536AOM_status = (*((unsigned char *)(recieve_buffer+31)) & 0xF0) >> 4LeafWetnessData = (*((unsigned char *)(recieve_buffer+32)) &                  0xF);LeafWetnessEnabled = (*((unsigned char *)(recieve_buffer+32)) &                  0x40) == 0x40;          // Check the value of bit 6C.   Using MDMP command     While the MDMP command is only available on the GroWeather,Energy, and Health stations, it is very useful any time you wantto examine several station memory locations at once. Forinstance, looking at all the Hi/Lows or all the Alarm thresholds.You could, in principal, use MDMP as an alternative to the LOOPcommand to provide real time data, but it imposes a greaterburden on the Station, Link, and PC processing power andbandwidth. It is therefore not recommend for continuous use.     There are 2 difficulties that must be addressed whenextracting MDMP data. First, locating the desired data in thedata buffer. Second, making sure that the number is sign extendedif the value is supposed to be a negative number.     Assuming that the MDMP data is stored in a continuous bytesized buffer starting with byte 0, Bank 0 data from the stationwill be found in Bytes 0-127. Bank 1 data from the station willbe found in Bytes 128-255. Remembering that the addresses in thetables below are in nibbles, even addresses are stored in theLeast-Significant-Nibble of their corresponding byte, and oddaddresses are in the Most-Significant-Nibble.     To request and store a memory dump:put_serial_string ("MDMP");  // Request Memory Dumpput_serial_char (0x0d);get_acknowledge();         // verify that the command was                            // received and got ACKCRC_Error = fill_crc_buffer(258);  // 256 data bytes + 2 CRC bytes.                              // receive_buffer has memory dump data.Some examples of reading data out of this buffer:     Wind speed on the GroWeather is located at address 0x060 =96. This corresponds to byte 48 in the buffer. Since the datastarts on an even address and is only 2 nibbles long andunsigned, byte 48 is the Wind Speed without any furtherprocessing.WindSpeed = receive_buffer(48);     Daily ET on the GroWeather is located at address 0x0A7 =167. This corresponds to the upper nibble of byte 83 in thebuffer. Since the data value is 3 nibbles long, the whole of byte84 is also part of this data field. The data is unsigned so we donot have to worry about sign extension.// Mask and shift nibble 1nibble1 = (receive_buffer[83] & 0xF0) >> 4;  // Add in the upper 2 nibblesDayET = nibble1 + (receive_buffer[84] * 16);      Hi Air Temp on the GroWeather is located at address 0x145 =325 (69 in Bank 1). This corresponds to the upper nibble of byte162 (128 + 34.5). The data field also includes all of byte 163.After extracting the data, we must check for a negative value.// Mask and shift nibble 1nibble1 = (receive_buffer[162] & 0xF0) >> 4;  // Add in the upper 2 nibblesHiAirTemp = nibble1 + (receive_buffer[163] * 16);// Check the sign bit of a 3-nibble 2's complement numberif (HiAirTemp > 2048)   HiAirTemp = HiAirTemp - 4096;   // If negative, make it so     And finally, Soil Temp Low Alarm Threshold on the GroWeatheris located at address 0x13C = 316 (60 in Bank 1). Thiscorresponds to byte 158. The data also extends into the lowernibble of byte 159. Again the data needs to be sign extended ifnecessary// Mask out the Hi nibblenibble3 = (receive_buffer[159] & 0x0F) * 256; // add lower byte to nibble3SoilLowAlarm = receive_buffer[158] + nibble3; // Check the sign bit of a 3-nibble numberif (SoilLowAlarm > 2048)           // If negative, make it so   SoilLowAlarm = SoilLowAlarm - 4096;        D.   Invalid Data values     In general there are 2 different ways that numerical data isstored on the weather station: Signed and Unsigned. These twomethods use different values to indicate that the sensor is notattached (or not working).  Signed data can use either thelargest positive or smallest negative number that fits into it'sdata size. Unsigned data uses the largest value.     You must keep in mind the size (in nibbles) of the datafield you are examine since this will affect the numerical valuesto be checked for.     These Data values are also used in Alarm Thresholds toindicate that no threshold has been set and therefore not to testfor that particular alarm condition.     Always check sensor values for invalid data BEFORE applyingcalibration numbers. Do not apply a calibration number to aninvalid data value.     Rain Rate is a special case dealt with below.     Data that accumulates over time (i.e. Rain, ET, Degree-Days,Wind Run, Solar Energy, and UV Dose) is unsigned data. The errorvalue is used only for inactive alarm thresholds.Signed Data Values:     Temperature: All temperatures, Hi/Lows, Alarm thresholds,and Cal numbers are Signed data. On the Monitor, the Wizard, andthe Perception, these values are stored in 4 nibble fields.Therefore the error values are 0x7FFF = 32767 and 0x8000 = -32768.On the GroWeather, Energy, and Health stations, these values arestored in 3 nibble fields. And the error values are 0x7FF = 2047and 0x800 = -2048.     Barometer: The current and stored barometer data is storedin 4 nibble fields on all stations. The barometer alarm is storedin 2 nibbles, and uses the value 0x7F = 127 or 0x80 = -128 forinvalid data.     Wind Direction: On the Monitor, and Wizard stations, thewind direction is stored in a 4 nibble field and uses the values0x7FFF or 0x8000 to indicate an invalid wind direction.     On the GroWeather, Energy, and Health stations, winddirection is stored in a 3 nibble field and uses the values 0x7FFor 0x800 to indicate an invalid wind direction.     This information only applies to the current wind directionon the station, or in the sensor image on the link (i.e. LOOPdata packet). The data stored in the archive memory is anunsigned byte with the compass direction of the prevailing windfrom 0-15. The value 255 is used to indicate that there waseither no wind or no wind direction data during the archiveperiod.     In addition, the GroWeather, Energy, and Health stationsalso have 1 nibble fields that record both the current winddirection and the wind direction at the time of the hi windspeed. All 16 values of a 1 nibble number are needed to representthe 16 different compass points. You will need to check the valueof the appropriate status bit in order to determine if the datais valid.     Humidity: Since valid Humidity values only range from 1% to100%, it does not make much difference whether humidity isconsidered a signed or unsigned value. An illegal Humidityreading is represented by the value 0x80 which can either bethought of as 128 or -128 depending upon whether the data issigned or unsigned. The weather station treats the data as signedfor the purposes of clearing Hi/Low values.Unsigned Data Values:     Wind Speed: Except for Rev A Monitors, and Wizards, windspeed data on all stations is 2 nibbles long and unsigned. On theRev A Monitors and Wizards, the data is signed.     The wind speed hi alarm threshold on all Monitors andWizards is a 4 nibble signed number using 0x7FFF or 0x8000 toindicate an invalid alarm.     On the GroWeather, Energy, and Health stations, the windspeed hi alarm is a 2 nibble unsigned number which uses 0xFF =255 to indicate an invalid alarm. Note that this means that whilethe current (and Hi) data can display the value of 255, the alarmcan not be set to this value, since that value is used toindicate the absence of a wind speed alarm.     Solar Rad: Solar rad is a 3 nibble unsigned number that uses0xFFF = 4095 to indicate invalid data.     UV Intensity: UV Intensity is stored as a 2 nibble unsignednumber. The current value, hi value, and hi alarm use the value0xFF = 255 to indicate invalid data.Rain Rate Data     The rain rate data is stored as a 3 nibble unsigned number.Because of the way that rain rate is measured and calculated,larger data values correspond to smaller rain rates. Setting thehi rain rate to zero, for instance, results in an infinite rainrate that is displayed with dashes. These dashes will not go awayuntil the hi rain rate is cleared. When a rain rate value iscleared, it is set to 0xFFF = 4095, the display will read 0.0inches per hour. In some cases, the station treats this value asa signed number and uses the value 0x7FF = 2047 to indicate acleared rain rate.E.   Calculated Data values     Here are some formulas and code examples for how tocalculate some of the "Derived" data values found on the station:1.   Wind Chill     Wind chill represents how cold the temperature feels in thepresence of wind. It is based on the current wind speed(calibration is ignored) and the current outside temperature(calibration is used). The following C code shows how this isdone. Note that if the temperature is above 91, the wind has noeffect on the wind chill./* Chill Factor (cf) at 5 MPH intervals */unsigned char chillTableOne [] ={156, 151, 146, 141, 133, 123, 110, 87, 61, 14, 0};/* delta cf for interpolation of table one */unsigned char chillTableTwo [] ={0, 16, 16, 16, 25, 33, 41, 74, 82, 152, 0};/*+-----------------------------------------+   Assumes temperature is in F.   & speed is in Mph   Returns Chill in F*/float ChillCalc (int speed, float t){   int index;   float cf, chill;   if (speed > 50)                  // Max. speed of 50 mph.      speed = 50;   index = 10 - speed / 5;          // this division is notrounded!   cf = chillTableOne [index] +            (chillTableTwo [index] / 16.0) * (speed % 5); // '%' is the mod operator that gives the remainder when the // first operand is divided by the second operand // Only apply chill factor if the temperature is less that 91.4   if ( t < 91.4 )      chill =  cf * ((t - 91.4) / 256.0) + t;   else      chill = t;return chill;}2.   Dew Point     The dewpoint is the temperature that dew begins to form.Water will condense on an object that is colder that the dewpointof the surrounding air. It represents the absolute amount ofwater in the atmosphere -- a higher dewpoint means there is morewater in the air. This value is based on the outside temperatureand outside humidity (both calibrated)./****************** * DewCalc Computes the dew point based on Relative Hum & Temp * rh in % (i.e. 0.0 - 100.0), temp in F * Computes dp in C and converts to F if using those units ******************/float DewCalc (float rh, float temp){   // verify that the input data is valid before continuing   if (rh<1 || rh>100 || temp<-100 || temp>200)      {      return NO_DATA;  // return with "error" if input is invalid.      }   float dp, ews, num, den;   temp= (5.0/9.0)*(temp-32.0);  // convert temp to C   ews= rh*0.01*exp((17.502*temp)/(240.9+temp));                            // ews is proportional to the vapor pressure   num= 240.9*(log(ews));   // "log" is really "ln" (i.e. log base e)   den= 17.5-(log(ews));   dp= num/den;   if (tempUnits == FAHRENHEIT)  // Convert back to F if required.      dp= (9.0/5.0)*dp+32;   return dp;}3.   Temperature-Humidity Index     Temperature-Humidity Index (THI) is a measure of"sultriness", or "how hot does it feel?". Based on a paper byR.G. Steadman, it uses outside temperature and outside humidity(both calibrated).  The station determines THI by interpolationfrom the table in the file thitable.h. This table is indexed bytemperature in 1 degree intervals for each row, and humidity in10 percent intervals for each column.     Because this measurement is primarily intended formonitoring human health and comfort in hot weather, it onlycovers temperatures greater than 68 F (20 C). If the temperatureis less than 68 F then the station only displays that the THI is"LO". In addition, if the calculated THI is greater than 125 F(51 C) then the station reports a THI of 125 F alternated with adisplay of "HI". There are status bits on the station to let youknow if either of these conditions exist.4.   THSWI     Temperature-Humidity-Sun-Wind Index (THSWI) extends THI byadding in the effects of the Sun and the Wind. For a completediscussion, see the paper "The Assessment of Sultriness. Part II:..." contained in Volume 18 of the Journal of AppliedMeteorology.     If either the Solar sensor, or the anemometer is notattached (or not working) then the corresponding component ofTHSWI will not be calculated. Wind direction is used to determineif the anemometer is working since there is no other way todistinguish between an absent anemometer and a valid reading of 0MPH. This means you can not use a Wizard II-S anemometer (speedonly, no wind direction) if you want the station to calculateTHSWI.     THSWI has the same temperature limits as THI as describedabove.5.   Wind Run     Wind run measures the total volume of wind that has passedby the anemometer. It is implemented on the station by countingthe number of revolutions of the anemometer. Every 1600revolutions is one mile of wind run. Thus every 160 revolutionsis one tenth of a mile of wind run. You can use wind run datafrom the archive as an average wind speed after taking intoaccount the archive period. The following table shows how toconvert wind run data into average wind speed data. There is noadvantage to using this technique for archive intervals of 1 or 5minutes.     You can also use this table to convert average wind speeddata into wind run by dividing the wind speed data by the givenfactor. The resolution of the resulting wind run data will be thesame as the conversion factor.Conversion factors for Wind Run to Average MPHArchive   multiply wind  Resolution (0.1 mile of wind run = XXMPH)interval  run by         MPH120       0.5            0.0560        1.0            0.130        2.0            0.215        4.0            0.410        6.0            0.65         12.0           1.21         60.0           6.06.   Degree-Days     Degree days are calculated by "integrating" the amount bywhich the current temperature is above (or below) a thresholdover time. Here is how you could calculate degree-day values froman existing temperature database.     First, select the temperature threshold you will use, andwhether you are calculating Heating Degree-days (temperature isbelow the threshold), Cooling Degree-days (temperature is abovethe threshold), or Growing Degree-days (like Cooling DD with anoptional hi temperature limit). Also select the time period ofthe calculation. This procedure will give the total Degree-daysover the whole period.     Second, Clear out your Degree-day accumulator.     Third, for each record in your data base in the specifiedperiod, calculate the difference between the temperature and thethreshold. For Heating degree-days, use threshold - temperature;for Cooling degree-days use, use temperature - threshold; forGrowing degree-days, use MIN(temperature, hi_threshold) -low_threshold. Only use these numbers if the value is greaterthan 0, otherwise use 0.     Fourth, multiply the value from step 3 by the number ofminutes in the archive period and add to the accumulator. Repeatsteps 3 and 4 for each record in the data base in the specifiedperiod.     Fifth, after all the data points have been accumulated,divide the result by 1440 (the number of minutes in a day). Thisis the total accumulated degree-days during the selected period.     Note that degree-day values calculated by the stationconsole may differ from values calculated from the algorithmgiven above because the station samples the temperature values ona real time basis instead of using averaged values.7.   Solar Energy     Solar energy, measured in Langleys, is Solar radiationintegrated over time. One Langley equals 11.622 Watt hours persquare meter = 697.32 Watt minutes per square meter.8.   UV Dose     UV Dose is UV Intensity, measured in MED's per hour,integrated over time.  See above for how to convert UV Index intoMED's per hour.9.   Rain Rate     Rain Rate data on the station is stored as the number of «seconds between rain clicks. See above for how to convert this toinches per hour. If the number of « seconds is 0, then thedisplay will dash because the corresponding rate would beinfinite. If the number of « seconds is greater than 720 = 6minutes, then the corresponding rate is less that 0.1 inch perhour.     One consequence of the way that rain rate is calculated isthat there can be no rate determination until the second rainclick occurs. Further, there will be some delay before any changein the rain rate is displayed, and this delay will be longer whenthe rate decreases. Any time the station notices that more than 6seconds have gone by without a rain click, the rate value iscleared to 0 (« seconds = 0xFFF = 4095). This is checked every 4seconds, so it might take as long as 10 seconds after the lastrain click for the rate value to be cleared.F.   CRC Checking     The CRC checking used by the WeatherLink is based on the CRC-CCITT standard. The heart of the method involves a CRC-accumulator that uses the following formula on each successivedata byte. After all the data bytes have been "accumulated",there will be a two byte CRC checksum that will get processed inthe same manner as the data bytes. If there has been notransmission error, then the final CRC-accumulator value will be0 (assuming it was set to zero before accumulating data).     In the following code, "crc" is the crc accumulator (16 bitsor 2 bytes), "data" is the data or crc checksum byte to beaccumulated, and "crc_table" is the table of CRC values found inthe CCITT.h header file. The operator "^" is an exclusive-or(XOR), ">> 8" shifts the data right by one byte (divides by 256),and "<< 8" shifts the data left by one byte (multiplies by 256).crc =  crc_table [(crc >> 8) ^ data] ^ (crc << 8);     Rev E WeatherLinks also require CRC codes on all commandssent from the PC (unless they have been disabled with the "CRC0"command.). The end of line character (0x0D) is included in theCRC calculation. The following code shows one way to implementthis. Basically, the command to be sent is stored in the"command_buffer". A CRC code is calculated on this data and issent to the WeatherLink. Then the command is sent.unsigned char command_buffer [32];int command_len;unsigned int crc;// generate the commandcommand_buffer[0] = 'M';command_buffer[1] = 'D';command_buffer[2] = 'M';command_buffer[3] = 'P';command_buffer[4] = 0x0d;       // an MDMP commandcommand_len = 5;                // 5 characters in the command// we can not use C string functions since the commands couldcontain// null bytes.// calculate the CRC codecrc = 0;                        // initialize the crc valuefor (j=0; j<command_len; j++)   // for each character in thecommand   {   crc =  crc_table [(crc >> 8) ^ command_buffer[j]] ^ (crc << 8);                           // accumulate the j'th character into                           // the crc. Uses the above formula.   }// send the CRC codesend_unsigned(crc);// send the commandfor (j=0; j<command_len; j++)   {   put_serial_char(command_buffer[j]);   }// We are ready to receive an acknowledge and the requested data.G.   Reading Hi/Low Times and Dates     On the Monitor, Wizard, and Perception stations, the timesand dates of hi, low, and stored (bar) data takes 7 nibbles andhas exactly the same format as the station time and date. Thetime uses 4 nibbles: the first two contain the hour in BCD andthe next two contain the minutes also in BCD. The date is storedin 3 nibbles: the first two contain the day in BCD and the thirdnibble holds the month in binary.     This is also the same format used for the "TimeStamp" fieldin the archive image and archive records on all stations. Thefirst two bytes are the time and the second two bytes are thedate.     On the GroWeather station, the times and dates are stored in4 nibbles. The first nibble is used to indicate how many days agothe Hi/Low was recorded (0-14). If the event was more than 14days ago, then the value 15 is stored. The upper 3 nibblescontain the time, expressed as the number of minutes aftermidnight, in binary.     On the Energy and Health stations, the date of hi/low eventsis not recorded. The time is stored in 3 nibbles, expressed asthe number of minutes after midnight, in binary.     In the following examples the function convert_BCD()converts one byte from BCD to binary. (e.g. if you pass in 69 =0x45, the function will return 45 = 0x2D.) There are many ways torepresent the time and date on the PC. These examples will usethe following structures:struct time {   int hour, minutes;} hi_low_time;struct date {   int day, month;} hi_low_date, current_date;Reading the time and date of the high wind speed on the Monitor:put_serial_string ("WRD"); // Send read command.put_serial_char (0x42);    // read 4 nibbles from bank 0.put_serial_char (0x64);    // Read beginning at 64h.                           // (Time of hi wind speed on Monitor)put_serial_char (0xd);     // Send CR...get_acknowledge();         // verify that the command was received and got ACKfill_buffer(2);            // get the returned data (in bytes)hi_low_time.hour = convert_BCD(receive_buffer[0]);    // convert hourshi_low_time.minutes = convert_BCD(receive_buffer[1]); // convert minutesput_serial_string ("WRD"); // Send read command.put_serial_char (0x32);    // read 3 nibbles from bank 0.put_serial_char (0x68);    // Read beginning at 68h.                           // (Date of hi wind speed on Monitor)put_serial_char (0xd);     // Send CR...get_acknowledge();         // verify that the command wasreceived and got ACKfill_buffer(2);            // get the returned data (in bytes)hi_low_date.day = convert_BCD(receive_buffer[0]);    // convert dayhi_low_date.month = receive_buffer[1] & 0x0F;        // extract monthReading the time and date of high outside temp on the GroWeatherput_serial_string ("WRD"); // Send read command.put_serial_char (0x44);    // read 4 nibbles from bank 1.put_serial_char (0x54);    // Read beginning at 64h.                      // (Time/date of hi outside temp on GroWeather)put_serial_char (0xd);     // Send CR...get_acknowledge();         // verify that the command was received and got ACKfill_buffer(2);            // get the returned data (in bytes)days_ago = recieve_buffer[0] & 0x0F;   // Mask out the relative dateminutes = *((unsigned int*) recieve_buffer);minutes = minutes >> 8;    // minutes now contains the time ofthe hitime.hour = minutes / 60;     // integer divisiontime.minutes = minutes % 60;  // remainder after dividing by 60if (days_ago < 15)            // has the Hi/low expired?   // calculate the Hi/low date by subtracting days_ago from the current date   hi_low_date = current_date - days_ago;else   {  // Mark date invalid since we don't know how log ago the hi low happened   hi_low_date.day = hi_low_month = 0;   }Reading the time of high THI on the Energyput_serial_string ("WRD"); // Send read command.put_serial_char (0x32);    // read 3 nibbles from bank 0.put_serial_char (0x9F);    // Read beginning at 9Fh.                           // (Time of hi THI on Energy)put_serial_char (0xd);     // Send CR...get_acknowledge();         // verify that the command wasreceived and got ACKfill_buffer(2);            // get the returned data (in bytes)minutes = *((unsigned int*) recieve_buffer);     // minutes now contains the time of the hitime.hour = minutes / 60;     // integer divisiontime.minutes = minutes % 60;  // remainder after dividing by 60IX.  Memory addresses.NOTES:     In the tables below, the third hex digit of the addressindicates the memory bank (0 or 1) where the data is stored.     Bit locations are indicated by a memory location namefollowed by a period and a number from 0-3. for example:"BarSteady     Equ BarFlag.0" indicates that the Bar Steady flagis located in bit 0 of the nibble named BarFlag.     Multi-nibble values are stored least significant nibblefirst. The addresses listed in the tables below are the addressesof the least significant nibble. Commands like WRD will correctlyalign nibbles into bytes before transmission to the PC for valuesthat begin on both even and odd addresses.     The station date is encoded in 3 nibbles on the Monitor,Wizard, and Perception stations and 5 nibbles on the GroWeather,Energy and Health stations. The first 2 nibbles store the day ofthe month in BCD. The third nibble is a number (1..12)representing the month. On the GroWeather, Energy and Healthstations, the last 2 nibbles are the year minus 1900 in binary.For example August 5 1996 is stored as "5 0 8 0 6" in increasingaddress order. Day = 05, Month = 8, Year = 60 hex = 96 = 1996;     The station time is encoded in 6 nibbles.  The first 2nibbles store the hour in BCD.  The second 2 nibbles store theminutes in BCD. The last 2 nibbles store the seconds in BCD.     On the Monitor, Wizard, and Perception stations, Hi/LowTimes are stored exactly like the station time. Hi/Low Dates use3 nibbles and record the Day and Month of the Hi/Low event in thesame manner as the first 3 nibbles of the station date.     On the GroWeather, Energy, and Health stations, Hi/LowTime/Dates are stored differently. On the GroWeather they take 4nibbles and include both time and date information, on the Energyand Health, only the time is recorded. In both storage schemesthe time is recorded in 3 nibbles as a binary number giving thenumber of minutes since midnight. On the GroWeather, 1 nibble,the First, is used to indicate how many days ago the Hi/Low wasrecorded (0-14). If the event was more than 14 days ago, then thevalue 15 is stored.     The TimeStamp field in archive records and in the archiveimage consists of 4 bytes that identify the time and date of thestored record, or the current time and date on the station. Thefirst byte is the hours (0-23) in BCD, the second is the minutes(0-60) in BCD, the third is the day of the month (0-31) in BCD,and the fourth is the month (1-12) in binary.     Temperatures and Degree-Days are stored in tenths of øF.     Humidity is stored as a percent (1-100).     Pressure is stored in thousandths of an inch.     Wind speeds are stored in miles per hour.     Wind Run is stored as tenths of a mile.     Rain is stored as "clicks" or rain bucket tips.     Rain Rate is stored on the station as 1/2 seconds between      clicks, and on the link in Tenths of an inch per hour,      calculated from the station's Rain Cal number.     Solar Radiation is stored as Watts per square meter.     Solar energy is stored in tenths of a Langley.     UV Intensity is stored in tenths of a UV Index.     UV Dose is stored in tenths of a "standard" MED     ET is stored in 100'th of an inch.     Leaf Wetness ranges from 0 to 15 with 0 = Dry and 15 = Wet.     THI Stands for Temperature-Humidity Index     THSWI Stands for Temperature-Humidity-Sun-Wind IndexA.   Monitor, Wizard, and Perception StationBank 0Address Data     Data Size (nibbles)004D     Model:      DS  1      ; Weather Station type  SeeAppendix C005E     SpdDta:     DS  2      ; Current wind speed.0060     SpdHi:      DS  4      ; Hi wind speed.0064     SpdHTime:   DS  4      ; BCD hour and minutes of hi.0068     SpdHDate:   DS  3      ; BCD day of month + 1 nibble formonth006B     SpdAHi:     DS  4      ; Wind speed hi alarm threshold0079     BarFlag:    DS  1      ; Indicates the status of the bartrend arrows         BarSteady     Equ BarFlag.0  ; If BarSteady = 1, thenIgnore BarRise         BarRise       Equ BarFlag.1  ; and BarFall Bits         BarFall       Equ BarFlag.2008A     DewDta:     DS  4      ; Current dew point in tenths F.008E     DewHi:      DS  4      ; Hi dew point in tenths F.0092     DewLo:      DS  4      ; Lo dew point in tenths F.0096     DewHTime:   DS  4      ; Time of hi dew point.009A     DewLTime:   DS  4      ; Time of lo dew point.009E     DewLDate:   DS  3      ; Date of lo dew point.00A1     DewHDate:   DS  3      ; Date of hi dew point.00A4     DewAHi:     DS  4      ; Hi dew point alarm.00A8     ChlDta:     DS  4      ; Current wind chill in tenths F.00AC     ChlLo:      DS  4      ; Low wind chill.00B0     ChlLTime:   DS  4      ; Time of low wind chill reading.00B4     ChlLDate:   DS  3      ; Date of low wind chill reading.00B7     ChlALo:     DS  4      ; Low wind chill alarm.Bank 1Address Data     Data Size (nibbles)0100     BarDta:     DS  4      ; Absolute barometric pressure.011A     BarAlm:     DS  2      ; Barometric pressure alarm.012C     StnDrd:     DS  4      ; Bar Calibration offset.                                ; LCD Display = BarDta - StnDrd0130     Tp1Dta:     DS  4      ; Current inside temperature.0134     Tp1Hi:      DS  4      ; Hi inside temperature.0138     Tp1Lo:      DS  4      ; Low inside temperature.013C     Tp1HTime:   DS  4      ; Time of hi inside temperature.0140     Tp1LTime:   DS  4      ; Time of low inside temperature.0144     Tp1HDate:   DS  3      ; Date of hi inside temperature.0147     Tp1LDate:   DS  3      ; Date of lo inside temperature.014A     Tp1AHi:     DS  4      ; Hi inside temperature alarm.014E     Tp1ALo:     DS  4      ; Low inside temperature alarm.0152     Tp1Cal:     DS  4      ; Inside temperature cal number.0156     Tp2Dta:     DS  4      ; Current outside temperature.015A     Tp2Hi:      DS  4      ; Hi outside temperature.015E     Tp2Lo:      DS  4      ; Lo outside temperature.0162     Tp2HTime:   DS  4      ; Time of hi outside temperature.0166     Tp2LTime:   DS  4      ; Time of lo outside temperature.016A     Tp2HDate:   DS  3      ; Date of hi outside temperature.016D     Tp2LDate:   DS  3      ; Date of low outsidetemperature.0170     Tp2AHi:     DS  4      ; Hi outside temperature alarm.0174     Tp2ALo:     DS  4      ; Low outside temperature alarm.0178     Tp2Cal:     DS  4      ; Outside temperature cal number.0180     Hm1Dta:     DS  2      ; Inside humidity.0182     Hm1Hi:      DS  2      ; Hi inside humidity.0184     Hm1Lo:      DS  2      ; Low inside humidity.0186     Hm1HTime:   DS  4      ; Time of hi inside humidity.018A     Hm1LTime:   DS  4      ; Time of low inside humidity.018E     Hm1HDate:   DS  3      ; Date of hi inside humidity.0191     Hm1LDate:   DS  3      ; Date of low inside humidity.0194     Hm1AHi:     DS  2      ; Hi inside humidity alarm.0196     Hm1ALo:     DS  2      ; Low inside humidity.0198     Hm2Dta:     DS  2      ; Current outside humidity.019A     Hm2Hi:      DS  2      ; Hi outside humidity.019C     Hm2Lo:      DS  2      ; Low outside humidity.019E     Hm2HTime:   DS  4      ; Time of hi outside humidity.01A2     Hm2LTime:   DS  4      ; Time of low outside humidity.01A6     Hm2HDate:   DS  3      ; Date of hi outside humidity.01A9     Hm2LDate:   DS  3      ; Date of low outside humidity.01AC     Hm2AHi:     DS  2      ; Hi outside humidity alarm.01AE     Hm2ALo:     DS  2      ; Low outside humidity alarm.01B4     DirDta:     DS  4      ; Wind direction (0...359)01BE     Time:       DS  6      ; Time on station. BCD hour minsecond.01BE     Hour       (DS  2)     ; BCD Hours (00 - 23)01C0     Minute     (DS  2)     ; BCD Minutes01C2     Second     (DS  2)     ; BCD Seconds01C4     TimeAlm:    DS  4      ; Station alarm.01C4     HrAlm      (DS  2)     ; BCD Time alarm Hours (00 - 23)01C6     MinAlm     (DS  2)     ; BCD Time alarm Minutes01C8     Date:       DS  5      ; Station date.01C8     Day        (DS  2)     ; BCD Day of the month01CA     Month      (DS  1)     ; stored in binary 1-1201CE     YRnDta:     DS  4      ; Rain clicks recorded this year.01D2     DRnDta:     DS  4      ; Rain clicks recorded since last                                ;   clear of daily rain.01D6     RnCal:      DS  4      ; Number of clicks equivalent to1 inch.01DA     Hm2Cal:     DS  4      ; Outside hum cal number.B.   Monitor, Wizard, and Perception LinkBank 0Address Data     Data Size (nibbles)004D     Model:      DS  1      ; Weather Station type  SeeAppendix CBank 1Address Data     Data Size (nibbles)0100     NewPtr      DS  4      ; Address of next archive entry.0104     OldPtr      DS  4      ; Address of oldest archiveentry.; Sensor image begins here. (11Ch) - (139h)011C     Tin         DS  4      ; Inside temperature0120     Tout        DS  4      ; Outside temperature0124     WSp         DS  2      ; Wind speed0126     WDir        DS  4      ; Wind direction012A     Barom       DS  4      ; Barometer012E     Hin         DS  2      ; Inside humidity0130     Hout        DS  2      ; Outside humidity0132     Rain        DS  4      ; Rain0136     Unused      DS  4      ; Unused bytes sent in the LOOPcommand; End of sensor image. (139h) Size = 1Eh = 30 nib = 15 bytes013A     SamplePer   DS  2      ; Sample Period = 256 - "Data"seconds013C     ArcPeriod   DS  2      ; Archive interval in minutes.0140     PrevRain    DS  4      ; Rain click total at time oflast archive.0148     LastArchiveTime  DS  4 ; Time in min. since midnight oflast archive.015E     WDirs       ds 32      ; Histogram of wind directions.; Archive Image begins here: (188h)-(1B1h)0188     ArchiveImage0188     Barom       Ds  4      ; Barometer reading at archivetime.018C     Hin         Ds  2      ; Inside humidity at archivetime.018E     Hout        Ds  2      ; Outside humidity at archivetime.0190     Rain        Ds  4      ; Rainfall in period.0194     TinAvg      Ds  4      ; Average inside temperature.0198     TOutAvg     Ds  4      ; Average outside temperature.019C     WspAvg      Ds  2      ; Average wind speed in period.019E     Wdir        Ds  2  ; Dominant wind direction in archiveperiod. (0-15)01A0     THiOut      Ds  4      ; Hi Tout in period.01A4     Gust        Ds  2      ; Hi wind speed in period.01A6     TimeStamp   Ds  8      ; Archive entry time and date.01AE     TLowOut     Ds  4      ; Low Tout in period.;End of Archive Image (1DF) Size = 2Ah = 42 Nibbles = 21 BytesC.   GroWeather StationBank 0Address Data     Data Size (nibbles)000E     LWReg       DS  1      ; Leaf Wetness Enabled Register         LWEnabled     Equ LWEnabled.2  ; 0 = Soil Temp, 1 = Leaf Wetness0036     AlarmReg:   DS  5      ; Bit flags for each alarm. SeeAppendix G1003B     AOMStat:    DS  1      ; AOM Load Status report.  SeeAppendix B003D     DirFlags:   DS  1         BadDirF       Equ DirFlags.2   ; Is current Dir Bad?1=bad, 0=good         BadHiDir      Equ DirFlags.3   ; Is Hi Dir Bad?1=bad,0=good004D     Model:      DS  1      ; Weather Station type.  SeeAppendix C0049     HiTHIFlags: DS  1      ; Hi THI status Flags         HiTHILowFl    Equ HiTHIFlags.2 ; Hi THI Value is >= 125         HiTHIHiFl     Equ HiTHIFlags.3 ; Hi THI Value is belowrange005F     THIFlags:   DS  1      ; THI status flags         THILowFl      Equ THIFlags.2   ; 1 = Air Temp < 68degrees         THIHiFl       Equ THIFlags.3   ; 1 = THI >= 125 degrees0060     SpdDta:     DS  2      ; # of pulses in 2.25 seconds,equiv. to MPH0062     SpdHi:      DS  2      ; High Wind speed (MPH)0064     SpdHTime:   DS  4      ; Time of High Wind Speed0068     SpdAHi:     DS  2      ; High Wind Speed alarm (MPH)006A     SpdCal:     DS  4      ; Wind Speed Calibration Number0075     HiDir:      DS  1      ; Compass Rose Direction of Hiwind speed                                ;  0=N, 1=NNE, 2=NE, etc.                                ;  See Appendix F007A     BarFlag:    DS  1      ; Indicates the status of the bartrend arrows         BarSteady     Equ BarFlag.0  ; If BarSteady = 1, thenIgnore BarRise         BarRise       Equ BarFlag.1  ; and BarFall Bits         BarFall       Equ BarFlag.2007B     PwrFlags:   DS  1         BattLow       Equ PwrFlags.2  ; 1 = the Battery Voltageis low         PowLow        Equ PwrFlags.3  ; 1 = the primary powervoltage is low008A     DewDta:     DS  3      ; Current Dewpoint Data (DegreesF*10)008D     DewAHi:     DS  1      ; Dew point alarm stored here.008E     ChlDta:     DS  3      ; Current Wind Chill Data(Degrees F*10)0091     ChlLo:      DS  3      ; Low Wind Chill0094     ChlLTime:   DS  4      ; Time/Date of Low Wind Chill0098     ChlALo:     DS  3      ; Wind Chill Low Alarm Threshold009E     RunDta:     DS  4      ; Daily Wind Run Data (Miles *10)00A2     RunTDta:    DS  5      ; Total (Period) Wind RunData(Miles *10)00A7     ETDDta:     DS  3      ; Daily ET (Inches *100)00AA     ETDAl:      DS  3      ; Daily ET Alarm Threshold(Inches *100)00AD     ETTDta:     DS  4      ; Total ET (Inches *100)00B1     ETTAl:      DS  4      ; Total ET Alarm Threshold(Inches *100)Bank 1Address Data     Data Size (nibbles)0100     BarDta:     DS  4      ; Current Barometer Data (Inches*1000)0118     BarSto:     DS  4      ; Stored Bar Data011C     BarStoT:    DS  4      ; Stored Bar Time and Date0120     StnDrd:     DS  4      ; Bar Calibration Offset                                ; LCD Display = BarDta - StnDrd0124     BarAlm:     DS  2      ; Bar Trend Alarm Threshold0130     Tp1Dta:     DS  3      ; Current Soil Temperature Data(Degrees F*10)0133     Tp1Hi:      DS  3      ; Hi Soil Temp Data0136     Tp1Lo:      DS  3      ; Low Soil Temp Data0139     Tp1AHi:     DS  3      ; Soil Temp Hi Alarm Threshold013C     Tp1ALo:     DS  3      ; Soil Temp Low Alarm Threshold013F     Tp1Cal:     DS  3      ; Soil Temp Cal Number0142     Tp2Dta:     DS  3      ; Current Air Temp Data(DegreesF*10)0145     Tp2Hi:      DS  3      ; Hi Air Temp Data0148     Tp2Lo:      DS  3      ; Low Air Temp Data014B     Tp2AHi:     DS  3      ; Air Temp Hi Alarm Threshold014E     Tp2ALo:     DS  3      ; Air Temp Low Alarm Threshold0151     Tp2Cal:     DS  3      ; Air Temp Cal Number0154     Tp2HTime:   DS  4      ; Time/Date of Hi Air Temp0158     Tp2LTime:   DS  4      ; Time/Date of Low Air Temp015C     DDDDta:     DS  3      ; Daily Degree-Day Data (DegreesF*10)015F     DDTDta:     DS  5      ; Total Degree-Day Data (DegreesF*10)0164     DDBase:     DS  3      ; Degree-Day Base temp (DegreesF*10)0167     DDTAHi:     DS  5      ; Degree-Day Total AlarmThreshold016C     DDMax:      DS  3      ; Degree-Day Max temp (DegreesF*10)0173     Hm2Dta:     DS  2      ; Current Outside Humidity Data(0-100%)0175     Hm2Hi:      DS  2      ; Hi Outside Hum Data0177     Hm2Lo:      DS  2      ; Low Outside Hum Data0179     Hm2HTime:   DS  4      ; Time/Date of Hi Outside Hum017D     Hm2LTime:   DS  4      ; Time/Date of Low Outside Hum0181     Hm2AHi:     DS  2      ; Outside Hum Hi Alarm Threshold0183     Hm2ALo:     DS  2      ; Outside Hum Low Alarm Threshold0185     Hm2Cal:     DS  2      ; Outside Hum Cal Number018B     DirDta:     DS  3      ; Current Wind Direction Data (0-360)0194     Time:       DS  6      ; Current Station Time(HH:MM:SS)0194     Hour       (DS  2)     ; BCD Hours (00 - 23)0196     Minute     (DS  2)     ; BCD Minutes0198     Second     (DS  2)     ; BCD Seconds019A     TimeAlm:    DS  4      ; Station Time Alarm (HH:MM)019A     HrAlm      (DS  2)     ; BCD Time alarm Hours (00 - 23)019C     MinAlm     (DS  2)     ; BCD Time alarm Minutes019E     Date:       DS  5      ; Current Station Date (DD:M:YY)019E     Day        (DS  2)     ; BCD Day of the month01A0     Month      (DS  1)     ; stored in binary 1-1201A1     Year       (DS  2)     ; Year = 1900+binary data01A3     THIDta:     DS  3      ; Current THI Data (Degrees F*10)01A6     THIHi:      DS  3      ; Hi THI Data01A9     THIHTime:   DS  4      ; Time/Date of Hi THI01AD     THIAHi:     DS  3      ; THI Hi Alarm Threshold01B0     PerLen:     DS  4      ; Length of Period that tracksTotal values                           ; Low order nibble is in 1/16'ths of aday (90 min)01B1     PerDay     (DS 3)      ; Upper 3 nibbles are the numberof Whole days                                ; in the period01B4     ACTime:     DS  4      ; AutoClear Time (Same format asTime) (HH:MM)01B8     SradDta:    DS  3      ; Current Solar Radiation Data                                ;      (Watts per square Meter)01BB     SEngDDta:   DS  4      ; Daily Solar Energy Data(Langleys *10)01BF     SEngTDta:   DS  6      ; Total Solar Energy Data(Langleys *10)01C5     YRnDta:     DS  4      ; Total Rain Data01C9     DRnDta:     DS  3      ; Daily Rain Data01CC     DRnAHi:     DS  3      ; Daily Rain Alarm Threshold01CF     RnCal:      DS  4      ; Rain Cal Number (Number ofclicks in 1 inch)01D3     RateDta:    DS  3      ; Current Rain Rate in 1/2seconds per click01D6     RateHi:     DS  3      ; Hi Rain Rate Data01D9     RateHTime:  DS  4      ; Time/Data of Hi Rain Rate01DD     PowVolt:    DS  1      ; Voltage of the primary powersource                                ;  See Appendix D01DE     LeafDta:    DS  1      ; Current Leaf Wetness DataD.   GroWeather Link; Memory Bank 0 AT 0hAddress Data     Data Size (nibbles)004F     Model:      DS 1       ; Weather Station type  SeeAppendix C; ET data input registers. used to calculate hourly data for ETcalculation.0080     ETTemp      ds 5       ; ET Temperature accumulator0085     ETSun       ds 5       ; ET Solar Rad accumulator008A     ETHum       ds 4       ; ET Humidity accumulator008E     ETWind      ds 4       ; ET Wind Speed accumulator0092     ETTSamp     ds 2       ; Count of ET Temp samples0094     ETSSamp     ds 2       ; Count of ET Sun samples0096     ETHSamp     ds 2       ; Count of ET Hum samples0098     ETWSamp     ds 2       ; Count of ET Wind samples009A     ETSampCnt   ds 2       ; Count of ET Sample readings009E     ETDay       ds 3       ; Shadow of Station Daily ET Data00A1     ETTot100    ds 5       ; Shadow of Station Total ET Data; Memory Bank 1 AT 100hAddress Data     Data Size (nibbles)0106     OldPtr      ds 4       ; Points to oldest entry inarchive memory.; Sensor image begins here. (10Ah) - (14Fh); Each Field is in full bytes for ease of PC Loop modeinterpretation010A     NewPtr      ds 4       ; Points to next free archivememory location.010E     SIStatus    ds 2       ; Bar trend and Power flags  SeeAppendix A0110     GTSoil      ds 4       ; Current Soil temperature.0114     GTAir       ds 4       ; Current Air temperature.0118     GWSp        ds 2       ; Current wind speed.011A     GWDir       ds 4       ; Current Wind direction indegrees.011E     GBarom      ds 4       ; Current Barometer reading.0122     GRate       ds 2       ; Current Rain Rate0124     GHout       ds 2       ; Current outside humidity.0126     GTRain      ds 4       ; Total rainfall.012A     GSun        ds 4       ; Current Solar Rad in W/m^2012E     GTRun       ds 6       ; Total Wind Run0134     TET         ds 4       ; Total ET0138     GTDegDay    ds 6       ; Total Degree-Days013E     GTEnrgy     ds 6       ; Total Solar Energy0144     Galarms     ds 6       ; Current Alarm Bits  SeeAppendix G1 and B0146     LWData      ds 2       ; Current Leaf Wetness Data andStatus                                ;   See Appendix G3; End of sensor image. (14Ah) Size = 42h = 66nib = 33bytes0150     SamplePer   ds 2       ; Sample Period = 256 - "Data"seconds0152     ArcPeriod   ds 2       ; Archive period in minutes.0154     LastArchiveTime  ds 4  ; Time of last archive in min.since midnight.; Accumulation registers.0158     WspAccum    ds 4       ; Sum of wind speed samples inarchive per.015C     TinAccum    ds 5       ; Sum of Soil temp samples inarchive per.0161     ToutAccum   ds 5       ; Sum of out temp samples inarchive per.0166     SunAccum    ds 5       ; Sum of Solar Rad samples inarchive per.0178     Samples     ds 2       ; Number of samples taken inperiod.017C     LnkRnCal    ds 4       ; Link copy of the Station's RainCal0180     WDirs       ds 32      ; Histogram of wind directions.; Archive Image begins here: (1A0h)-(1DFh)01A0     ArchiveImage01A0     Barom       Ds 4       ; Barometer reading at archivetime.01A4     Hout        Ds 2       ; Outside humidity at archivetime.01A6     WspAvg      Ds 2       ; Average wind speed in period.01A8     Gust        Ds 2       ; Hi wind speed in period.01AA     Wdir        Ds 2  ; Dominant wind direction in archiveperiod. (0-15)01AC     Rain        Ds 4       ; Rainfall in period.01B0     TinAvg      Ds 4       ; Average Soil temperature.                           ; If Leaf Wetness is enabled, holds LWdata instead01B4     TOutAvg     Ds 4       ; Average outside temperature.01B8     TimeStamp   Ds 8       ; Archive entry time and date.01C0     THiOut      Ds 4       ; Hi Tout in period.01C4     TLowOut     Ds 4       ; Low Tout in period.01C8     DegDays     Ds 4       ; Degree-Days in period01CC     ETArc       Ds 2       ; ET in period01CE     ETStat      ds 2       ; bitmapped ET Calc. flagsSee Appendix G201D0     Wind Run    Ds 4       ; Wind run in period01D4     Sun         Ds 4       ; Average Solar Radiation inperiod01D8     Energy      Ds 4       ; Solar energy in period01DC     HiRate      Ds 2       ; Hi Rain Rate in period01DE     GArcPowV    DS 2       ; Station Power voltage atarchive time                                ;   See Appendix D;End of Archive Image (1DF) Size = 40h = 64 Nibbles = 32 Bytes; previous values registers:  These registers contain the value; of accumulated values at the beginning of the archive period01E0     PrevRun     ds 601E6     PrevDD      ds 601EC     PrevEnrg    ds 601F2     PrevRain    ds 401FF     WindThresh  ds 1       ; Wind Direction statistics aremade when the                                ; wind speed is greater thanWindThresh.E.   Energy StationBank 0Address Data     Data Size (nibbles)0036     AlarmReg:   DS  5      ; Bit flags for each alarm.  SeeAppendix G1003B     AOMStat:    DS  1      ; AOM Load Status report.  SeeAppendix B003D     DirFlags:   DS 1         BadDirF       Equ DirFlags.2    ; Is current Dir Bad?1=bad,0=good         BadHiDir      Equ DirFlags.3    ; Is Hi Dir Bad1=bad,0=good0049     HiTHIFlags: DS 1       ; Hi THI Flags         HiTHILowFl    Equ HiTHIFlags.2  ; Hi THI Value is >= 125         HiTHIHiFl     Equ HiTHIFlags.3  ; Hi THI Value is belowrange004D     Model:      DS  1      ; Weather Station type  SeeAppendix C005F     THIFlags:   DS  1      ; THI Flags         THILowFl      Equ THIFlags.2    ; 1 = Air Temp < 68degrees         THIHiFl       Equ THIFlags.3    ; 1 = THI >= 125 degrees0060     SpdDta:     DS  2      ; # of pulses in 2.25 seconds =.to MPH0062     SpdHi:      DS  2      ; High Wind speed (MPH)0064     SpdHTime:   DS  3      ; Time of High Wind Speed0067     HiDir:      DS  1      ; Compass Rose Direction of Hiwind speed                                ;  0=N, 1=NNE, 2=NE, etc.                                ;  See Appendix F0068     SpdAHi:     DS  2      ; High Wind Speed alarm (MPH)006A     SpdCal:     DS  4      ; Wind Speed Calibration Number007A     BarFlag:    DS 1       ; Indicates the status of the bartrend arrows         BarSteady     Equ BarFlag.0  ; If BarSteady = 1, thenIgnore BarRise         BarRise       Equ BarFlag.1  ; and BarFall Bits         BarFall       Equ BarFlag.2007B     PwrFlags:   DS 1         BattLow       Equ PwrFlags.2 ; 1 = the Battery Voltageis low         PowLow        Equ PwrFlags.3 ; 1 = the primary powervoltage is low008A     DewDta:     DS  3      ; Current Dewpoint Data (DegreesF*10)008D     ChlDta:     DS  3      ; Current Wind Chill Data(Degrees F*10)0090     ChlLo:      DS  3      ; Low Wind Chill Data0093     ChlLTime:   DS  3      ; Time of Low Wind Chill0096     ChlALo:     DS  3      ; Wind Chill Low Alarm Threshold0099     THIDta:     DS  3      ; Current THI Data (Degrees F*10)009C     THIHi:      DS  3      ; Hi THI Data009F     THIHTime:   DS  3      ; Time of Hi THI00A2     THIAHi:     DS  3      ; THI Hi Alarm Threshold00A5     RunDta:     DS  4      ; Daily Wind Run Data (Miles *10)00A9     RunTDta:    DS  5      ; Total (Period) Wind Run Data(Miles *10)00B2     DirDta:     DS  3      ; Current Wind Direction Data (0-360)00B5     DewAHi:     DS  1      ; Dew point alarm stored hereBank 1Address Data     Data Size (nibbles)0100     BarDta:     DS  4      ; Current Barometer Data (Inches*1000)0118     StnDrd:     DS  4      ; Bar Calibration Offset                                ; LCD Display = BarDta - StnDrd011C     BarAlm:     DS  2      ; Bar Trend Alarm Threshold0124     Tp1Dta:     DS  3      ; Current Inside Temp. Data(Degrees F*10)0127     Tp1Hi:      DS  3      ; Hi Inside Temperature Data012A     Tp1Lo:      DS  3      ; Low Inside Temperature Data012D     Tp1HTime:   DS  3      ; Time of Hi Inside TemperatureData0130     Tp1LTime:   DS  3      ; Time of Low Inside TemperatureData0133     Tp1Cal:     DS  3      ; Inside Temperature Cal Number0136     Tp2Dta:     DS  3      ; Current Outside Temp. Data(Degrees F*10)0139     Tp2Hi:      DS  3      ; Hi Outside Temperature Data013C     Tp2Lo:      DS  3      ; Low Outside Temperature Data013F     Tp2HTime:   DS  3      ; Time of Hi Outside TemperatureData0142     Tp2LTime:   DS  3      ; Time of Low Outside TemperatureData0145     Tp2Cal:     DS  3      ; Outside Temperature Cal Number0148     Tp2AHi:     DS  3      ; Outside Temperature Hi AlarmThreshold014B     Tp2ALo:     DS  3      ; Outside Temperature Low AlarmThreshold0151     HtDDDDta:   DS  3      ; Heating Degree-Day Daily(Degrees F*10)0154     HtDDTDta:   DS  5      ; Heating Degree-Day Total(Degrees F*10)015C     ChDDDDta:   DS  3      ; Wind Chill Degree-Day Daily(Degs F*10)015F     ChDDTDta:   DS  5      ; Wind Chill Degree-Day Total(Degs F*10)0164     HtDDBase:   DS  3      ; Heating/Wind Chill Degree-DayBase temp                                ;(Degrees F*10)016A     CoDDDDta:   DS  3      ; Cooling Degree-Day Daily(Degrees F*10)016D     CoDDTDta:   DS  5      ; Cooling Degree-Day Total(Degrees F*10)0175     THDDDDta:   DS  3      ; THI Degree-Day Daily (DegreesF*10)0178     THDDTDta:   DS  5      ; THI Degree-Day Total (DegreesF*10)017D     CoDDBase:   DS  3      ; Cooling/THI Degree-Day Basetemp                                ; (Degrees F*10)0184     Hm2Dta:     DS  2      ; Current Outside Humidity Data(0-100%)0186     Hm2Hi:      DS  2      ; Hi Outside Hum Data0188     Hm2Lo:      DS  2      ; Low Outside Hum Data018A     Hm2HTime:   DS  3      ; Time of Hi Outside Hum Data018D     Hm2LTime:   DS  3      ; Time of Low Outside Hum Data0190     Hm2AHi:     DS  2      ; Outside Hum Hi Alarm Threshold0192     Hm2ALo:     DS  2      ; Outside Hum Low Alarm Threshold0194     Hm2Cal:     DS  2      ; Outside Hum Cal Number019C     Time:       DS  6      ; Current Station Time (HH:MM:SS)019C     Hour       (DS  2)     ; BCD Hours (00 - 23)019E     Minute     (DS  2)     ; BCD Minutes01A0     Second     (DS  2)     ; BCD Seconds01A2     TimeAlm:    DS  4      ; Station Time Alarm (HH:MM)01A2     HrAlm      (DS  2)     ; BCD Time Alarm Hours (00 - 23)01A4     MinAlm     (DS  2)     ; BCD Time Alarm Minutes01A6     PerLen:     DS  4      ; Length of Period that tracksTotal values                           ; Low order nibble is in 1/16'ths of aday (90 min)01A7     PerDay     (DS  3)     ; Upper 3 nibbles are the numberof Whole days                                ; in the period.01AA     ACTime:     DS  4      ; AutoClear Time (Same format asTime) (HH:MM)01AE     Date:       DS  5      ; Current Station Date (DD:M:YY)01AE     Day        (DS 2)      ; BCD Day of the month01B0     Month      (DS 1)      ; stored in binary 1-1201B1     Year       (DS 2)      ; Year = 1900+binary data01B3     SRadDta:    DS  3      ; Solar Radiation(Watts persquare Meter)01B6     SEngDDta:   DS  4      ; Daily Solar Energy (Langleys*10)01BA     SEngTDta:   DS  6      ; Total Solar Energy (Langleys*10)01C0     YRnDta:     DS  4      ; Total Rain Data01C4     DRnDta:     DS  3      ; Daily Rain Data01C7     DRnAHi:     DS  3      ; Daily Rain Alarm Threshold01CA     RnCal:      DS  4      ; Rain Cal Number (Number ofclicks in 1 inch)01D1     RateDta:    DS  3      ; Current Rain Rate in 1/2seconds per click01D4     RateHi:     DS  3      ; Hi Rain Rate Data01D7     RateHTime:  DS  3      ; Time of Hi Rain Rate01DD     PowVolt:    DS  1      ; Voltage code of the primarypower source                                ;   See Appendix DF.   Energy LinkBank 0Address Data     Data Size (nibbles)004F     Model:      DS  1      ; Weather Station type  SeeAppendix C0080     PrevChDD    ds  6      ; previous Wind Chill Degree-DaysTotal0086     PrevCoDD    ds  6      ; previous Cooling Tot Degree-Days Total008C     PrevTHDD    ds  6      ; previous THI Degree-Days TotalBank 1Address Data     Data Size (nibbles)0106     OldPtr      ds  4      ; Points to oldest entry inarchive memory.; Sensor image begins here. (10Ah) - (14Fh); Each Field is in full bytes for ease of PC Loop modeinterpretation010A     NewPtr      ds  4      ; Points to next free archivememory location.010E     SIStatus    ds  2      ; Bar trend and Power flags  SeeAppendix A0110     TIn         ds  4      ; Current Inside temperature.0114     TAir        ds  4      ; Current Air temperature.0118     WSp         ds  2      ; Current wind speed.011A     WDir        ds  4      ; Wind direction in degrees.011E     Barom       ds  4      ; Current Barometer reading.0122     Rate        ds  2      ; Current Rain Rate0124     Hout        ds  2      ; Current outside humidity.0126     TRain       ds  4      ; Total rain.012A     Sun         ds  4      ; Current Solar Rad in W/m^2012E     TRun        ds  6      ; Total Wind Run0134     TEnrgy      ds  6      ; Total Solar Energy013A     Alarms      ds  6      ; Current Alarm Bits  SeeAppendix E1 & B; End of sensor image. (13Fh) Size = 36h = 54 nibbles = 27 bytes0150     SamplePer   ds  2      ; Sample Period = 256 - "Data"seconds0152     ArcPeriod   ds  2      ; Archive period in minutes.0154     LastArchiveTime  ds  4 ; Time of last archive in min.since midnight; Accumulation registers.0158     WspAccum    ds  4      ; Sum of wind speed samples inarchive per.015C     TinAccum    ds  5      ; Sum of Soil temp samples inarchive per.0161     ToutAccum   ds  5      ; Sum of out temp samples inarchive per.0166     SunAccum    ds  5      ; Sum of Solar Rad samples inarchive per.0178     Samples     ds  2      ; Number of samples taken inperiod.017C     LnkRnCal    ds  4      ; Link copy of the Station's RainCal0180     WDirs       ds 32      ; Histogram of wind directions.; Archive Image begins here: (1A0h)-(1DFh)01A0     ArchiveImage01A0     Barom       Ds  4      ; Barometer reading at archivetime.01A4     Hout        Ds  2      ; Outside humidity at archivetime.01A6     WspAvg      Ds  2      ; Average wind speed in period.01A8     Gust        Ds  2      ; Hi wind speed in period.01AA     Wdir        Ds  2 ; Dominant wind direction in archiveperiod. (0-15)01AC     Rain        Ds  4      ; Rainfall in period.01B0     TinAvg      Ds  4      ; Average inside temperature.01B4     TOutAvg     Ds  4      ; Average outside temperature.01B8     Time        Ds  4      ; Archive entry time in BCD(HH:MM).01BC     Date        Ds  4      ; Archive entry date in BCD(MM:DD)01C0     THiOut      Ds  4      ; Hi Tout in period.01C4     TLowOut     Ds  4      ; Low Tout in period.01C8     HtDegDays   Ds  2      ; Heating Degree-Days in period01CA     ChDegDays   Ds  2      ; Wind Chill Degree-Days inperiod01CC     CoDegDays   Ds  2      ; Cooling Degree-Days in period01CE     THDegDays   Ds  2      ; THI Degree-Days in period01D0     Wind Run    Ds  4      ; Wind run in period01D4     Sun         Ds  4      ; Average Solar Radiation inperiod01D8     Energy      Ds  4      ; Solar energy in period01DC     HiRate      Ds  2      ; Hi Rain Rate in period01DE     PowerVolt   Ds  2      ; Station Power Voltage atarchive time                                ;  See Appendix D;End of Archive Image (1DF).  Size = 40h = 64 Nibbles = 32 Bytes; previous values registers01E0     PrevRun     ds  6      ; Previous Total Wind Run01E6     PrevHtDD    ds  6      ; Previous Heating DD01EC     PrevEnrg    ds  6      ; Previous Total Solar Energy01F2     PrevRain    ds  4      ; Used to archive Previous Rainamount.01FF     WindThresh  ds  1      ; Wind Direction statistics aremade when the                                ; wind speed is greater thanWindThresh.G.   Health StationBank 0Address Data     Data Size (nibbles)000A     BarFlag:    DS  1      ; Indicates the status of the bartrend arrows         BarSteady     Equ BarFlag.0  ; If BarSteady = 1, thenIgnore BarRise         BarRise       Equ BarFlag.1  ; and BarFall Bits         BarFall       Equ BarFlag.2000B     PwrFlags:   DS  1         BattLow       Equ PwrFlags.2  ; 1 = the Battery Voltageis low         PowLow        Equ PwrFlags.3  ; 1 = the primary powervoltage is low000D     OTHIRange:  DS  1      ; Range bits for Outside THI         OTHILowFl      Equ OTHIRange.0  ; 1 = Outside Temp < 68degrees         OTHIHiFl       Equ OTHIRange.1  ; 1 = THI >= 125 degrees         HiOTHILowFl    Equ OTHIRange.2  ; 1 = Hi THI Value isbelow range         HiOTHIHiFl     Equ OTHIRange.3  ; 1 = Hi THI Value is >=125000E     THSWIRange: DS  1      ; Range bits for Outside THSWI         THSWILoFl      Equ THSWIRange.0  ; 1 = Outside Temp < 68degrees         THSWIHiFl      Equ THSWIRange.1  ; 1 = THSWI >= 125degrees         HiTHSWILoFl    Equ THSWIRange.2  ; 1 = Hi THSWI Value isbelow range         HiTHSWIHiFl    Equ THSWIRange.3  ; 1 = Hi THSWI Value is>= 125000F     ITHIRange:  DS  1      ; Range bits for Inside THI         ITHILowFl      Equ ITHIRange.0  ; 1 = Inside Temp < 68degrees         ITHIHiFl       Equ ITHIRange.1  ; 1 = THI >= 125 degrees         HiITHILowFl    Equ ITHIRange.2  ; 1 = Hi THI Value is >=125         HiITHIHiFl     Equ ITHIRange.3  ; 1 = Hi THI Value isbelow range0037     LatCode:    DS  1      ; Code for the current Latitudezone                                ;  See Appendix E0038     AlarmReg:   DS  5      ; Bit flags for each alarm  SeeAppendix H1003D     AOMStat:    DS  1      ; AOM Load Status report  SeeAppendix B003E     DirFlags:   DS  1         BadDirF       Equ DirFlags.2    ; Is current Dir Bad?1=bad,0=good         BadHiDir      Equ DirFlags.3    ; Is Hi Dir Bad1=bad,0=good004D     Model:      DS  1      ; Weather Station type  SeeAppendix C0060     SpdDta:     DS  2      ; # of pulses in 2.25 seconds =MPH0062     SpdHi:      DS  2      ; High Wind speed (MPH)0064     SpdHTime:   DS  3      ; Time of High Wind Speed0067     HiDir:      DS  1      ; Compass Rose Direction of Hiwind speed                                ;  0=N, 1=NNE, 2=NE, etc.                                ;  See Appendix F0068     SpdAHi:     DS  2      ; High Wind Speed alarm (MPH)006A     SpdCal:     DS  4      ; Wind Speed Calibration Number008A     DewDta:     DS  3      ; Current Dewpoint Data (DegreesF*10)008D     DewAHi:     DS  1      ; Dewpoint Alarm is stored here008E     ChlDta:     DS  3      ; Current Wind Chill Data(Degrees F*10)0091     ChlLo:      DS  3      ; Low Wind Chill0094     ChlLTime:   DS  3      ; Time of Low Wind Chill0097     ChlALo:     DS  3      ; Wind Chill Low Alarm Threshold009A     ITHIDta:    DS  3      ; Current Inside THI Data(Degrees F*10)009D     ITHIHi:     DS  3      ; Hi Inside THI00A0     ITHIHTime:  DS  3      ; Time of Hi Inside THI00A3     ITHIAHi:    DS  3      ; Inside THI Hi Alarm Threshold00AA     DirDta:     DS  3      ; Current Wind Direction Data (0-360)00AD     SRadDta:    DS  3      ; Current Solar Radiation Data                                ;  (Watts per square Meter)00B0     SRadHDta:   DS  3      ; Hi Solar Radiation00B3     SRadHTim:   DS  3      ; Time of Hi Solar RadBank 1Address Data     Data Size (nibbles)0100     BarDta:     DS  4      ; Current Barometer Data (Inches*1000)0118     StnDrd:     DS  4      ; Bar Calibration Offset                                ; LCD Display = BarDta - StnDrd011C     BarAlm:     DS  2      ; Bar Trend Alarm Threshold0124     Tp1Dta:     DS  3      ; Current Inside Temperature Data0127     Tp1Hi:      DS  3      ; Hi Inside Temperature012A     Tp1Lo:      DS  3      ; Low Inside Temperature012D     Tp1HTime:   DS  3      ; Time of Hi Inside Temp0130     Tp1LTime:   DS  3      ; Time of Low Inside Temp0133     Tp1AHi:     DS  3      ; Inside Temp Hi Alarm Threshold0136     Tp1ALo:     DS  3      ; Inside Temp Low Alarm Threshold0139     Tp1Cal:     DS  3      ; Inside Temp Cal Number013C     Tp2Dta:     DS  3      ; Current outside TempData(Degrees F*10)013F     Tp2Hi:      DS  3      ; Hi Outside Temp0142     Tp2Lo:      DS  3      ; Low Outside Temp0145     Tp2HTime:   DS  3      ; Time of Hi Outside Temp0148     Tp2LTime:   DS  3      ; Time of Low Outside Temp014B     Tp2AHi:     DS  3      ; Outside Temp Hi Alarm Threshold014E     Tp2ALo:     DS  3      ; Outside Temp Low AlarmThreshold0151     Tp2Cal:     DS  3      ; Outside Temp Cal Number0154     OTHIDta:    DS  3      ; Current Outside THI Data(Degrees F*10)0157     OTHIHi:     DS  3      ; Hi Outside THI015A     OTHIHTime:  DS  3      ; Time of Hi Outside THI015D     OTHIAHi:    DS  3      ; Outside THI Hi Alarm Threshold0160     THSWDta:    DS  3      ; Current Outside THSWI Data(Degrees F*10)0163     THSWHi:     DS  3      ; Hi THSWI0166     THSWHTime:  DS  3      ; Time of Hi THSWI0169     THSWAHi:    DS  3      ; THSWI Hi Alarm Threshold0170     Hm1Dta:     DS  2      ; Current Inside Humidity Data (0-100%)0172     Hm1Hi:      DS  2      ; Hi Inside Hum Data0174     Hm1Lo:      DS  2      ; Low Inside Hum Data0176     Hm1HTime:   DS  3      ; Time of Hi Inside Hum0179     Hm1LTime:   DS  3      ; Time of Low Inside Hum017C     Hm1AHi:     DS  2      ; Inside Hum Hi Alarm Threshold017E     Hm1ALo:     DS  2      ; Inside Hum Low Alarm Threshold0180     Hm2Dta:     DS  2      ; Current Outside Humidity Data(0-100%)0182     Hm2Hi:      DS  2      ; Hi Outside Hum Data0184     Hm2Lo:      DS  2      ; Low Outside Hum Data0186     Hm2HTime:   DS  3      ; Time of Hi Outside Hum0189     Hm2LTime:   DS  3      ; Time of Low Outside Hum018C     Hm2AHi:     DS  2      ; Outside Hum Hi Alarm Threshold018E     Hm2ALo:     DS  2      ; Outside Hum Low Alarm Threshold0190     Hm2Cal:     DS  2      ; Outside Hum Calibration Number0198     Time:       DS  6      ; Current Station Time (HH:MM:SS)0198     Hour       (DS  2)     ; BCD Hour (00 - 23)019A     Minute     (DS  2)     ; BCD Minutes019C     Second     (DS  2)     ; BCD Seconds019E     TimeAlm:    DS  4      ; Station Time Alarm (HH:MM)019E     HrAlm      (DS  2)     ; BCD Hour (00 - 23)01A0     MinAlm     (DS  2)     ; BCD Minutes01A2     PerLen:     DS  4      ; Length of Period that tracksTotal values                           ; Low order nibble is in 1/16'ths of aday01A3     PerDay     (DS  3)     ; Upper 3 nibbles are the numberof Whole days                                ; in the period01A6     Date:       DS  5      ; Current Station Date (DD:M:YY)01A6     Day        (DS  2)     ; BCD Day of the month01A8     Month      (DS  1)     ; stored in binary 1-1201A9     Year       (DS  2)     ; Year = 1900 + binary01AB     ACTime:     DS  4      ; AutoClear Time (Same format atTime) (HH:MM)01AF     YRnDta:     DS  4      ; Total Rain Data01B3     DRnDta:     DS  3      ; Daily Rain Data01B6     DRnAHi:     DS  3      ; Daily Rain Alarm Threshold01B9     RnCal:      DS  4      ; Rain Cal Number (Number ofclicks in 1 inch)01C0     RateDta:    DS  3      ; Rain Rate in 1/2 seconds perclick01C3     RateHi:     DS  3      ; Hi Rain Rate Data01C6     RateHTime:  DS  3      ; Time of Hi Rain Rate01C9     UVIdxDta:   DS  2      ; Current UV Intensity Data(Index*10)01CB     UVIdxHDta:  DS  2      ; Hi UV Intensity01CD     UVIdxHTim:  DS  3      ; Time of Hi UV Intensity01D0     UVIdxHAlm:  DS  2      ; UV Intensity Hi Alarm Threshold01D2     UVTDose:    DS  4      ; Total UV Dose01D6     UVDDose:    DS  3      ; Daily UV Dose01D9     UVDHAlm:    DS  3      ; Daily UV Dose Hi Alarm01DC     UVCal:      DS  2      ; MED's Cal number (x10)H.   Health LinkBank 0Address Data     Data Size (nibbles)004F     Model:      DS  1      ; Weather Station type  SeeAppendix CBank 1Address Data     Data Size (nibbles)0106     OldPtr      ds  4      ; Points to oldest entry inarchive memory.; Sensor image begins here. (10Ah) - (14Fh); Each Field is in full bytes for ease of PC Loop modeinterpretation010A     NewPtr      ds  4      ; Points to next free archivememory location.010E     SIStatus    ds  2      ; Bar trend and Power flags  SeeAppendix A0110     TIn         ds  4      ; Current Inside temperature.0114     TAir        ds  4      ; Current Air temperature.0118     WSp         ds  2      ; Current wind speed.011A     WDir        ds  4      ; Wind direction in degrees.011E     Barom       ds  4      ; Current Barometer reading.0122     Rate        ds  2      ; Current Rain Rate0124     TRain       ds  4      ; Total rainfall.0128     Sun         ds  4      ; Current Solar Rad in W/m^2012C     HIn         ds  2      ; Current inside humidity.012E     Hout        ds  2      ; Current outside humidity.0130     UVIdx       ds  2      ; current UV Intensity0132     UVDose      ds  4      ; Total UV Dose0136     Alarms      ds  6      ; Current Alarm Bits; End of sensor image. (13Bh) Size = 32h = 50 nib = 25 bytes0150     SamplePer   ds  2      ; Sample Period = 256 - "Data"seconds0152     ArcPeriod   ds  2      ; Archive period in minutes.0154     LastArchiveTime  ds  4 ; Time of last archive in minutessince midnight; Accumulation registers.0158     WspAccum    ds  4      ; Sum of wind speed samples inarchive per.015C     TinAccum    ds  5      ; Sum of Soil temp samples inarchive per.0161     ToutAccum   ds  5      ; Sum of out temp samples inarchive per.0166     SunAccum    ds  5      ; Sum of Solar Rad samples inarchive per.016B     UVAccum     ds  5      ; Sum of UV Rate samples inarchive per.0178     Samples     ds  2      ; Number of samples taken inperiod.017C     LnkRnCal    ds  4      ; Link copy of the Station's RainCal0180     WDirs       ds 32      ; Histogram of wind directions.; Archive Image begins here: (1A0h)-(1DFh)01A0     ArchiveImage01A0     Barom       Ds  4      ; Barometer reading at archivetime.01A4     WspAvg      Ds  2      ; Average wind speed in period.01A6     Gust        Ds  2      ; Hi wind speed in period.01A8     Wdir        Ds  2 ; Dominant wind direction in archiveperiod. (0-15)01AA     HiRate      Ds  2      ; Hi Rain Rate in period01AC     Rain        Ds  4      ; Rainfall in period.01B0     TinAvg      Ds  4      ; Average inside temperature.01B4     TOutAvg     Ds  4      ; Average outside temperature.01B8     Time        Ds  8      ; Archive entry time and date.01C0     THiOut      Ds  4      ; Hi Tout in period.01C4     TLowOut     Ds  4      ; Low Tout in period.01C8     HIn         Ds  2      ; Inside humidity at archivetime.01CA     Hout        Ds  2      ; Outside humidity at archivetime.01CC     UVIndex     Ds  2      ; Average UV Intensity01CE     HHiIdx      ds  2      ; Hi UV Intensity in period01D0     UVDose      Ds  4      ; UV Dosage in period01D4     Sun         Ds  4      ; Average Solar Radiation inperiod01D8     HiSun       Ds  4      ; High Solar Rad in period;End of Archive Image (1DB).  Size = 3Ch = 60 Nibbles = 30 Bytes; Accumulation previous values registers01E0     PrevDose    ds 4  Used to archive Previous UV Doseamount.01F2     PrevRain    ; ds 4  Used to archive Previous Rainamount.01FF     WindThresh  ; ds 1  0-7 Mph for wind directioncalculations.