Operating instructions

DMD50 Universal Satellite Modem Rear Panel Interfaces
TM118 – Rev. 1.1 5-5
12 Send Timing B (+) ST-B Output
13 Clear T Send B (+) CS-B Output
14 Send Data B (+) SD-B Input
15 Send Timing A (-) ST-A Output
16 Receive Data B (+) RD-B Output
17 Receive Timing A (-) RT-A Output
18 Modulator Fault - Open Collector MF Output
19 Request To Send B (+) RS-B Input
20 Data Terminal Ready A (-) TR-A Input
21 Demodulator Fault DF Output
22 Data Mode B (+) DM-B Output
23 Data Terminal Ready B (+) TR-B Input
24 Terminal Timing A (-) TT-A Input
25 No Connection --- ---
5.3.11 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 5-5 for pinouts.
Table 5-5. 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