Comtech EF Data DMDVR20 LBST Rev 1.1 - Manual (Page 74)

DMDVR20 LBST Satellite Modem Rear Panel Interfaces
TM136 – Rev. 1.1 5-5
5.3.9 REMOTE (J20)
The Remote Port is a RS-485 or RS-232 Connection for remote monitor and control of the
modem. It is a 9-Pin Female “D” Connector. Refer to Table 5-4 for pinouts.
Table 5-4. Remote Port (RS-485 or RS-232) 9-Pin Female “D” Connector (J20)
Pin No. Signal Name Signal Direction
1 Transmit Data RS-485 (+) TX-485-B Output
2 Transmit Data RS-232 TXD-232 Output
3 Receive Data RS-232 RXD-232 Input
4 NC NC ---
5 Ground GND ---
6 Transmit Data RS-485 (–) TX-485-A Output
7 NC No Connection ---
8 Receive Data RS-485 (+) RX-485-B/CTS Input
9 Receive Data RS-485 (–) RX-485-A Input
When operating the remote port as RS232 using a cable pinned 1 for 1
may cause communication failures due to miss routing of standard
RS232 com port signals.
When operating the remote port as RS232, the cable used should only
have pins 2, 3 and 5 connected.
5.3.10 ETHERNET (J21) (FUTURE OPTION)
The ETHERNET Port (J21) can be used for the Monitor & Control (M&C) Functions of the unit.
The physical interface is a standard female RJ-45 Connector.