Figure 4-6. Rs-422 Block Diagram; Table 4-1. M&C Jumper Settings (As/4973) - Comtech EF Data SDM-100A Installation And Operation Manual

SDM-100A Satellite Modem
J1
5 TT
31,32 -5V
6 SD
37,38 +5V
13 MC
15 DF
16 MF
14 CS
7 RS
8 ST
33,34 +12V
10 RT
35,36 -12V
11 RD
12 RR
9 DM
1,2 GND
39,40 GND
3 INTF0
4 INTF1
JP10
JP22
JP2
JP3
JP11
JP6, JP7
Notes:
Rev. 0

Figure 4-6. RS-422 Block Diagram

Table 4-1. M&C Jumper Settings (AS/4973)
Jumper Position
1 to 2 RS-485
3 to 4 RS-485
5 to 6 RS-232-C
7 to 8 RS-232-C
3 to 4 RS-485
5 to 6 RS-232-C
1 to 2 4-wire
2 to 3 2-wire
1 to 2 4-wire
2 to 3 2-wire
1 to 2 CTS shorted to TX FPGA
3 to 4 CTS shorted to M&C
5 to 6 CTS shorted to RTS (RTS Loopback)
1 to 2 32/64k ROM size
2 to 3 128/256/512k ROM size
1. JP6 selects ROM size for U207, XILINX firmware.
2. JP7 selects ROM size for U208, DSP firmware.
DEMOD FAULT
MOD FAULT
GND
Function
(also 1 to 2 = SDM-100 operation)
Theory of Operation
P1
+TT 35
-TT 17
+S 22
-SD 4
+MC 34
-MC 16
21
3
+C 27
25
+R
+ST
23
-ST
5
+RT 26
-RT 8
+RD 24
-RD 6
+RR 31
-RR 13
+DM 29
-DM 11
1,19,20,37
4–15