Chapter 6: Connector Pin Assignments
The popular 9-pin D sub-miniature connector is used for interfacing to communication lines. The
connector is equipped with 4-40 threaded standoffs (female screw lock) to provide strain relief. Connector
pin assignments are as follows:
Pin No.
Signal
1 Rx-
2 Tx+
3 Tx-
4
5 Ground
6
7
8
9 Rx+
Table 6-1:
Connector Pin Assignments
The following table shows pin connections between two devices for Simplex, Half-Duplex, and Full-
Duplex operations.
Mode
Card 1
Card 2
Rx+ pin 9
Tx+ pin 2
Simplex, 2-wire, receive only, RS422
Rx- pin 1
Tx- pin 3
Tx+ pin 2
Rx+ pin 9
Simplex, 2-wire, transmit only, RS422
Tx- pin 3
Rx- pin 1
Tx+ / Rx+ pin 2 Tx+ / Rx+ pin 2
Half-Duplex, 2-wire,
RS485
Tx- / Rx- pin 3
Tx- / Rx- pin 3
Tx+ pin 2
Rx+ pin 9
Tx- pin 3
Rx- pin 1
Rx+ pin 9
Tx+ pin 2
Full-Duplex, 4-wire,
RS485
Rx- pin 1
Tx- pin 3
Table 6-2:
Data Cable Wiring
Manual PCI-ICM-1S
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