Rockwell Automation 1769-ASCII Compact I/O ASCII Module - Manual (Page 18)

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.
IMPORTANT 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 +
NC 1
RXD 2
TXD 3
NC 4
COM 5
NC 6
RTS 7
CTS 8
NC 9
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)
ASCII DTE DTE 9-pin 25-pin