Owner's manual

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+