Comtech EF Data SDM-309B - Manual (Page 29)

Installation SDM-309B Satellite Modem
2-2–4 MN/U-SDM309B Rev. #
2.2.1 Data I/O
For information and pinouts on the data connectors, please refer to the appropriate
subSection in Section 4.2 and Appendix C.
2.2.2 Remote (J6)
The remote connector on the modem is used to interface the Monitor and Control
functions to a remote location. This interface can be either RS232 or RS485. For a
complete discussion on the remote interface, refer to Sections 4.1.2 and 4.1.3.
2.2.2.1 Connector Pinout (J6)
The remote interface is provided on a 9 pin female "D" connector. Screw locks and
latching blocks are provided for mechanical security of the mating connector. The
remote connector is a DCE interface.
RS485 RS232
Pin# Name Pin# Name
1. GND 1.
2. 2. RD (RX)
3. 3. TD (TX)
4. +RX/TX 4.
5. -RX/TX 5. GND
6. 6. DSR
7. 7. RTS
8. +RX/TX 8. CTS
9. -RX/TX 9.
2.2.3 Fault (J7)
The fault connector on the modem is used to provide FORM C contact closures for the
purpose of fault reporting. There are three (3) FORM C summary fault contacts,
modulator, demodulator, and common equipment. For a complete discussion on what
faults are monitored refer to Section 3.1.5. To get a system summary alarm connect all
the FORM C contacts in parallel.
2.2.3.1 Connector Pinout (J7)
The fault interface is provided on a 9 pin female "D" connector. Screw locks and
latching blocks are provided for mechanical security on the mating connector.
Pin # Name
1. NO COMMON EQUIPMENT IS OK
2. COM