
18 Rockwell Automation Publication 1769-UM012B-EN-P - January 2014
Chapter 1 Compact I/O ASCII Module
Connect the D-sub Connector
Pins
All the pins are always active.
Figure 1 - RS-232 Wiring Diagram - Module to DTE Device (hardware handshaking disabled)
(1) Connect to the shield of the cable.
Pins unused for a particular physical network must not be connected via the
serial cable to any other device. In particular, do not use cables 1747-CP3 and
1756-CP3.
Pin RS-232 RS-422 RS-485
1 Do Not Connect Transmit Data - Transmit/Receive Data -
2 Receive Data Do Not Connect Do Not Connect
3 Transmit Data Do Not Connect Do Not Connect
4 Do Not Connect Receive Data - Do Not Connect
5 Common Common Common
6 Do Not Connect Receive Data + Do Not Connect
7 Request To Send Request To Send Request To Send
8 Clear To Send Clear To Send Clear To Send
9 Do Not Connect Transmit Data + Transmit/Receive Data +
NC1
RXD2
TXD3
NC4
COM5
NC6
RTS7
CTS8
NC9
DCD
TXD
RSD
DSR
COM
DTR
CTS
RTS
GND
8
2
3
6
7
20
5
4
1
1
3
2
6
5
4
8
7
(1)
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