Rockwell Automation 1747-KE DH-485/RS-232C INTERFACE MODULE - Manual (Page 13)

DH485/RS-232C Interface Module 13
Publication 1747-IN006B-EN-P - October 2005
Figure 10 RS-232/423 DTE to DCE (Non-modem Hardware Handshake to DCE)
Figure 11 RS-232/423 DTE to DCE (Modem Hardware Handshake to DCE)
Figure 12 RS-232/423 DTE to DCE (No Handshake to DCE)
NC
RXD
TXD
DTR
COM
DSR
RTS
CTS
NC
1
2
3
4
5
6
7
8
9
CD
TXD
RXD
COM
RI
1
2
3
4
5
6
7
8
9
8
3
2
20
7
6
4
5
22
DTR
DSR
RTS
CTS
NC
RXD
TXD
DTR
COM
DSR
RTS
CTS
NC
1
2
3
4
5
6
7
8
9
CD
TXD
RXD
COM
RI
1
2
3
4
5
6
7
8
9
8
3
2
20
7
6
4
5
22
DTR
DSR
RTS
CTS
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 CTS to RTS when using devices that cannot disable their hardware handshaking.