Table 2-4. 25-Pin D Connector Pinouts - Comtech EF Data SDM-300A Installation And Operation Manual

SDM-300A Satellite Modem
Rev. 4

Table 2-4. 25-Pin D Connector Pinouts

25-Pin D Connector
Pin # EIA-422
1 SHLD
2 SD-A
3 RD-A
4 RS-A
5 CS-A
6 DM-A
7 SIGGND
8 RR-A
9 RT+B
10 RR-B
11 TT+B
12 ST+B
13 CS+B
14 SD+B
15 ST-A
16 RD+B
17 RT-A
18 LL
19 RS+B
20* MC-A
21 DF
22 DM+B
23* MC+B
24 TT-A
25 MF
*Note: Use the MASTER clock for EXTERNAL clock input. This clock input
should equal the data rate unless the Asymmetrical Loop Timing Option (ASLT)
is available. The ASLT option allows selection of different clock rates that vary
from the digital data rate. Refer to the Utility/Modem Type/Modem Options menu
for the ASLT option information.
EIA-232 V.35
SHLD SHLD
TXD SD-A
RXD RD-A
RTS RTS
CTS CTS
DSR DSR
SIGGND SIGGND
DCD RLSD
SCR+B
SCTE+B
SCT+B
SD+B
ST SCT-A
RD+B
RXC SCR-A
LL LL
MC MC-A
DF DF
MC-B
TXC SCTE-A
MF MF
Installation
2–9