Rockwell Automation Allen-Bradley 1769-ASCII User Manual page 19

Figure 2 - RS-232 Wiring Diagram - Module to Printer (hardware handshaking enabled, standard
printer adapter cable)
ASCII DTE
1 NC
2 RXD
3 TXD
4 NC
5 COM
6 NC
7 RTS
8 CTS
9 N.C.
Figure 3 - RS-422 Wiring Diagram
ASCII
1 TXD-
2
NC
3 NC
4
RXD-
5 COM
6 RXD+
7
RTS
8 CTS
9 TXD+
Figure 4 - RS-485 Wiring Diagram
ASCII
1 TRXD-
2 NC
3
NC
4
NC
5 COM
6 NC
7
RTS
8
CTS
9 TRXD+
Rockwell Automation Publication 1769-UM012B-EN-P - January 2014
Compact I/O ASCII Module
DTE
9-pin 25-pin
CD 1 8
TXD 3 2
RXD 2 3
DSR 6 6
COM 5 7
DTR 4 20
CTS 8 5
RTS 7 4
RI 9 22
GND 1
RXD-
TXD-
COM
TXD+
RXD+
TRXD-
COM
TRXD+
Chapter 1
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