Product specifications

DS7862 (Rev. D, 1/4/07)
5-17
WeatherLink
7862
WeatherLink for Windows
™
Data Logger and Software
The WeatherLink data logger (referred to as the WeatherLink)
contains a microprocessor, ROM, and 32K RAM. When used with
the WeatherLink software, it does the following:
• Makes current sensor output data available for real-time “bulletin” display on the computer.
• Logs weather data for subsequent transfer to the computer.
• Enables user to set and clear data in the weather station console (time and date, highs and lows, alarm thresholds,
calibration numbers, etc.) from the computer.
• Manages data communication with the computer.
Details of data formatting and content are contained in the Programmer’s Reference Library (#7864, available upon
request); the contents of the Library may be downloaded from the Davis website (http://www.davisnet.com/support/
download).
The WeatherLink software provides a wide range of numeric and graphical display features.
General Description
The WeatherLink software enables transfer of data from the WeatherLink to your computer for creation of a
permanent weather database. Once stored in the database, the information may be used in the generation of a wide
variety of numerical reports and graphical displays.
System Requirements
Computer running Windows™ 95, 98, ME, NT 4.0, Windows 2000 or XP with at least one free serial port and 5 MB
of free disk space, or Computer running Windows™ 98 SE, ME, Windows 2000 or XP with at least one free USB port
and 5 MB free disk space. The amount of disk space necessary for the data files depends on the archive interval.
Database files containing data stored at a 30-minute archive interval require approximately 36K of disk space per
month of data. The file size changes in a linear fashion depending on the archive interval. For example, data stored
at a 1-minute interval requires approximately 1 MB/month, while the data stored at a 2-hour interval requires
approximately 9K/month. For phone modem connections, the following additional hardware is required: One external
modem to connect to the WeatherLink and one internal modem or external modem connected to your computer
(modems must be Hayes compatible and run at either 1200 or 2400 baud), and Telephone Modem Adapter (#7870).
Current Data
Current data are contained in an 18-byte “sensor image” which is available to be transmitted to the computer for real-
time ”bulletin” display.
Sensor Image Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Inside Temperature, Outside Temperature, Wind Direction (0°-360°),
Wind Speed, Rainfall Total, Inside Humidity, Outside Humidity,
Barometer
Transmission Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . Once per second (approximately)
Data Logging
Weather data are stored in 21-byte archive records. The records are contained in the 32K “archive” (1560 records)
which may be transferred to the computer using the software. Maxima, minima, and averages are taken over the
archive interval.
Archive Record Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . Inside Temperature (avg.), Outside Temperature (avg.), Maximum Air
Temperature, Minimum Air Temperature, Wind Direction (dominant),
Wind Speed (avg.), Maximum Wind Speed, Rainfall (increment), Inside
Humidity (last), Outside Humidity (last), Barometric Pressure (last),