3
General Overview
The short-range modem pair will allow you to ex-
tend the range of your WatchDog Weather Station
up to 4000 ft. Because the station is hardwired to
your computer, it is not necessary to have a line of
sight with the station.
Components
The components of the short-range modem pair
are as follows:
1. Optically Isolated RS-485 Converter
2. 3349CB RS-422 Connector Assembly
3. Short-range modem adaptor and modular con-
nector cable.
4. A/C adapter
The 2 converters must be connected by a length
of 6-wire cable (2 twisted pair, 1 ground, 1 volt-
age). The recommended wire type is number 24
AWG twisted-pair telephone cable with a shunt
capacitance of 16 picofarads/foot and a length no
greater than 4000 feet.
