Communication Cards
3-10 Rev 2/01
3.5 CONNECTING COMMUNICATIONS CARDS TO WIRING
Signal wiring connections to the communications cards are made through the terminal block located on
the serial communications cards, or through the RJ11 TELCO connector supplied on the modem card.
3.5.1 EIA-232 Communications Card Wiring
The EIA-232 communications card provides for RS232 signals on the host port. This communications
card also provides a means to switch external power to communication devices such as a radio to
conserve power. LEDs are provided for diagnostic functions. The screw terminals and their functions
are as follows:
Terminal Function
RXD Receive data
TXD Transmit data
DTR Data Terminal Ready
RTS Ready to Send
DCD Data Carrier Detect
GND Ground
IN Switched Power input
(Out) Switched power output
3.5.1.1 Auxiliary Power Wiring
Switched auxiliary power is used for radios or other devices that do not have a built-in sleep mode to
automatically shut the device off. Control of auxiliary power is set up by using the Radio Power
Control function of the ROCLINK software to achieve the required power cycling. The switched
method involves wiring the power through the EIA-232 communications card as shown in Figure 3-5.
If the auxiliary device already has a built-in sleep mode, or for some reason you do not need to cycle
the auxiliary power, you can wire directly to the RADIO terminals for power as described in Section 2.
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