Comtech EF Data SDM-300A - Manual (Page 87)

SDM-300A Satellite Modem Revision 6
External Connections MN/SDM300A.IOM
4–9
Table 4-6. 37-Pin Connector Pinouts (Optional)
Pin # RS-422/MIL-188-144
1, 19 Shield
3 MF
4 SD-A
5 ST-A
6 RD-A
7 RS-A
8 RT-A
9 CS-A
11 DM-A
13 RR-A
16 MC-A
17 TT-A
20, 37 SIGGND
21 DF
22 SD+B
23 ST+B
24 RD+B
25 RS+B
26 RT+B
27 CS+B
29 DM+B
31 RR+B
34 MC+B
35 TT+B
There are jumpers on the PL/6031 RS-422 interface. Place the jumpers on the center pin and the
pin towards the Master Clock (MC) to allow an external clock input on pins 16 and 34.
If desired, place the jumpers on the TR side to allow an external clock input on pins 12 and 30.
Place the jumpers on the TR side for Demand Assigned Multiple Access (DAMA) applications.