Product specifications

5-4
WeatherLink
WeatherLink for APRS with Streaming Data Logger (6540)
The Streaming Data Logger is designed for ham radio operators with the capability of accepting APRS data packets.
The product will allow the user to transmit weather data over ham radio without the need for a PC. Some
configurations may require a TNC modem. TNC (Terminal Node Controller) modems translate the data from a
Vantage Pro or Vantage Pro2 into packets for transmission via ham radio.
Hardware Installation and Requirements
In addition to the WeatherLink requirements, the streaming data capability has the following additional hardware
requirements.
• Ham radio with attached TNC modem capable of accepting APRS data packets.
• Computer running any version of Windows™ with at least 3 MB of RAM and 512 KB of hard disk space.
For further and more detailed information on APRS, please visit the following website:
http://web.usna.navy.mil/~bruninga/aprs.html.
Streaming Function Specifications
Time Out Period: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .The streaming data logger utilizes a time-out period for ceasing
streaming whenever software attempts to communicate to the logger.
Once communications to WeatherLink are initiated and successful,
the streaming data logger will be unable to communicate with the
Streaming Data Utility until the Time Out Period expires.
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 to 255 seconds (user selectable)
Default Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Streaming Interval:
Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 to 99 minutes (user selectable)
Default Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 minutes
Streaming Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . .Available Rates: 1200, 2400, 4800, 9600, 19200 (WeatherLink 5.6 or
later
Default: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9600
Streaming Data Output Parameters: . . . . . . . . . . . . . . . . Day of the Month, Time in GMT & 24 hour format, Latitude &
Longitude, Wind direction (in degrees), Wind Speed (1 min. avg. in
mph), High Wind Speed (in mph in the last 5 min.), Temperature (°F),
Rainfall (inches) in the last hour, Rainfall (inches) in the last 24 hours,
Daily Rainfall (inches since midnight), Humidity (in %, omitted if
missing), Barometric pressure (mb/hPa, omitted if missing), Solar
Radiation (in W/m2, omitted if missing).
WeatherLink for Alarm Output with Connector Block (6544)
The Connector Block is designed to allow you to turn heaters, fans, and other devices on or off using the data from
your weather station. The utility software steps you through the choices. For each of four outputs, you can enter up
to eight different weather parameters. Enter threshold values for each, select from nine different test conditions, and
logically combine the entries together as you choose. Our connector block provides the interface between your
Vantage Pro2 console or Weather Envoy and an electrical device. For high-power devices, you may also need to add
electrical relays (not supplied by Davis Instruments).
Hardware Installation and Requirements
In addition to the requirements for WeatherLink, the Irrigation capability has the following additional hardware
requirements.
• Computer running any version of Windows™ with at least 3 MB of RAM and 512 KB of hard disk space.
• Relays: You may need to obtain your own relays in order to switch equipment at voltages higher than 28 volts or
power levels above 10 Watts.
Caution: The Alarm Output data logger is not suitable for any use in which the health or safety of any person or the value or pro-
tection of valuable property is dependent on the operation of the device.