J-box/Signal Converter:
In the case of Venus 1500-controlled
radios, a J-box/signal converter is used to send RS4-22 signal and
power to the server radio. The signal converter will be one of two
types: one that accepts serial information from a computer via
RS-232 and one that accepts RS-232 information and a modem or
dial-up input. The same J-box/signal converter (
with both the indoor and outdoor server radios.
Figure 3: J-box/Signal
Converter
RS-232:
RS-232 is a standard PC communication type with a
maximum cable length of 25 feet (8 m). The output of the client
radio is RS-232.
RS-422:
RS-422 is a standard differential communication type
with a maximum cable length between the J-box/signal converter
and the serial radio of 1000 feet (300 m).
Signal Strength Indicator:
The server and client radios have
eight LEDs that are used to display signal strength. Refer to the left side of
number of LEDs that are lit on the client radio indicates the signal strength, with eight being
full strength and one indicating a weak signal. The specific address needs to be set on the
server radio to display signal strength, as explained in
Section 3.1
.
Figure 4: Outdoor Server/Client Radio Board Layout
4
Introduction