Comtech EF Data SDM-9000 - Manual (Page 49)

SDM-9000 Satellite Modem Installation
Rev. 4 2–7
2.4.6 Remote (J6)
The remote connector is used to interface the M&C functions to a remote location. This
is a Data Circuit Terminating Equipment (DCE) interface that can be either RS-232-C or
RS-485. Refer to Appendix B for remote control operation information.
The remote interface connection is a 9-pin female D connector located on the rear panel
of the modem. Screw locks are provided for mechanical security of the mating connector.
RS-485 RS-232-C
4-Wire Mode 2-Wire Mode
Pin # Name Name Pin # Name
1 GND GND 1
2 2 RD (RX)
3 3 TD (TX)
4 +TX +RX/TX 4
5 -TX -RX/TX 5 GND
6 6 DSR
7 7 RTS
8 +RX +RX/TX 8 CTS
9 -RX -RX/TX 9