Comtech EF Data SLM-5650A - Manual (Page 62)

SLM-5650A Satellite Modem Revision 8
Rear Panel Connectors and Pinouts MN-SLM5650A
3–4
3.3.2 P1 Overhead Data Interface Connector (DB-25M)
This is a male Type ‘D’ 25-pin ‘D’ (DB-25M) connector that allows for
connection of the EIA-422, EIA-485 and EIA-232 data interfaces used
with overhead framing. It also supports signaling for tactical applications.
P1 Overhead Data Connector (DB-25M) Pinout
Pin # Signal Function Name
1 EIA-422 Transmit Data “A”, Input Tx Data A
14 EIA-422 Transmit Data “B”, Input Tx Data B
2 EIA-422 Transmit Clock “A”, Output Tx Clk A
15 EIA-422 Transmit Clock “B”, Output Tx Clk B
3 EIA-422 Transmit Byte Sync “A”, Output Tx Sync A
16 EIA-422 Transmit Byte Sync “B”, Output Tx Sync B
4 EIA-422 Receive Data “A”, Output Rx Data A
17 EIA-422 Receive Data “B”, Output Rx Data B
5 EIA-422 Receive Clock “A”, Output Rx Clk A
18 EIA-422 Receive Clock “B”, Output Rx Clk B
6 EIA-422 Receive Byte Sync “A”, Output Rx Sync A
19 EIA-422 Receive Byte Sync “B”, Output Rx Sync B
7 Shield Ground
20 EIA-485 Transmit Data “-“ 485 Tx Data -
8 EIA-485 Transmit Data “+” 485 Tx Data +
21 EIA-422 Transmit Handover Sync “A”, Input THS A
9 EIA-485 Receive Data “-“ 485 Rx Data -
22 EIA-485 Receive Data “+” 485 Rx Data +
10 EIA-422 Transmit Handover Sync “B”, Input THS B
23 EIA-232 Clear to Send 232 CTS
11 EIA-232 Receive Data 232 Rx Data
24 EIA-232 Request to Send 232 RTS
12 EIA-232 Transmit Data 232 Tx Data
25 EIA-422 Transmit Handover Control “A”, Input THC A
13 EIA-422 Transmit Handover Control “B”, Input THC B
* For EIA-485 2-Wire Operation:
• Only two wires are required
• Tie pins 8 and 22 together (both +)
• Tie pins 9 and 20 together (both -)