EF-Series Instruction Manual
Rev 2/01 3-11
Figure 3-5. Wiring Switched Auxiliary Power
3.5.2 EIA-485 Communications Card Wiring
The EIA-485 communications card provides for RS-485 signals on the host port (Comm1). Wiring
should be twisted-pair cable. This board also provides additional protection for the external wiring and
the board circuitry. LEDs are provided for diagnostic functions. The terminals and their functions are
as follows:
Terminal Function
A RS485 positive
B RS485 negative
GND Ground
RS232
Comm
Card
+
Switched Power
–
to Radio or
Other Device
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