Rockwell Automation 1747-KE DH-485/RS-232C INTERFACE MODULE - Manual (Page 14)

14 DH485/RS-232C Interface Module
Publication 1747-IN006B-EN-P - October 2005
Figure 13 RS-232/423 DTE to DCE (Soft or No Handshake to DCE)
Figure 14 RS-422
Figure 15 RS-485
NC
RXD
TXD
DTR
COM
DSR
RTS
CTS
NC
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
8
3
2
20
7
6
4
5
22
CD
COM
RI
RXD
TXD
DTR
DSR
RTS
CTS
(1)
(1)
(1) Connect DSR to DTR and CD, and CTS to RTS when using devices that cannot disable their hardware handshaking.
TXD-
RXD-
COM
RXD+
TXD+
1
2
3
4
5
6
7
8
9
RXD-
TXD-
COM
TXD+
RXD+
TRXD-
COM
TRXD+
1
2
3
4
5
6
7
8
9
TRXD-
COM
TRXD+