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CDM-600 Satellite Modem Revision 7
Connector Pinouts MN/CDM600.IOM
5–4
5.5 Audio Interface Connector (P4A)
The Audio interface connection is a 9-pin female D connector located on the rear panel of
the modem. Refer to Table 5-5 for pin assignments.
Table 5-5. Audio Interface Connector Pin Assignments
Pin # Signal Function Direction
1 Tx Audio 1 + In
6 Tx Audio 1 - In
2 Rx Audio 1 + Out
7 Rx Audio 1 - Out
8 Tx Audio 2 + In
4 Tx Audio 2 - In
9 Rx Audio 2 + Out
5 Rx Audio 2 - Out
3 Common
5.6 Remote Control Interface Connector (P4B)
The remote control interface connection is a 9-pin male connector located on the rear
panel of the modem. Refer to Table 5-6 for pin assignments.The remote control port is
intended for connection to an M&C computer, or terminal device. This interface is user
selectable for either EIA-232 or EIA-485.
Table 5-6. Remote Control Interface Connector Pin Assignments
Pin #
Description Direction
1 Ground
2 EIA-232 Transmit Data Out
3 EIA-232 Receive Data In
4 Reserved - do not connect to this pin
5 Ground
6 EIA-485 Receive Data B * In
7 EIA-485 Receive Data A * In
8 EIA-485 Transmit Data B Out
9 EIA-485 Transmit Data A Out
* Use for 2-wire EIA-485 operation