Comtech EF Data SDM-300A - Manual (Page 82)

SDM-300A Satellite Modem Revision 6
External Connections MN/SDM300A.IOM
4–4
4.1.1 Remote Connector and Pinouts (J6)
The remote connector is a 9-pin subminiature female D connector (J6) located on the rear panel of
the modem. Screw locks are provided for mechanical security of the mating connector.
The remote connector interfaces the M&C functions to a remote location. The remote location can
be an M&C computer located away from the modem, but attached via cable to the remote
connector. This DCE interface is user selectable for either RS-232 or RS-484. Refer to Appendix
A for a description of the remote interface commands.
Refer to Table 4-2 for pinout information.
Table 4-2. Remote Connector and Pinouts (J6)
Pinout
RS-232 RS-485
Pin # Name Pin #
Name
(2-Wire)
Name
(4-Wire)
1 1 GND
2 RD (RX) 2
3 TD (TX) 3
4 4* +RX/TX +TX
5 GND 5* -RX/TX -TX
6 DSR 6
7 RTS 7
8 CTS 8* +RX/TX +RX
9 9* -RX/TX -RX
*For 2-Wire Operation:
• Only two wires are required.
• Tie pins 4 and 8 together (both +).
• Tie pins 5 and 9 together (both -).