Rockwell Automation 1747-KE,D17476.12 DH-485/RS-232C Interface Module - Manual (Page 46)

Publication 1747-UM005B-EN-P - March 2006
4-8 Installation and System Configuration
Connect Cable to CONFIG or
DF1 Ports The CONFIG and DF1 ports communicate to user devices through
RS-423/232, RS-422, and RS-485 Communication modes.
The Communication mode is selected by setting jumpers JW1 and JW2
as described on pages 4-5 and 4-6.
Use these pin assignments to construct communication cables for the
CONFIG and DF1 ports. These connectors must be wired to
correspond to the selected communication mode.
Pin Assignments for CONFIG and DF1 Ports
IMPORTANT
The following table and cable drawings assume the
peripheral devices have conventional pin
assignments. Check the documentation for your
device to verify signals conform to those shown.
Pin for
Interface
Module RS-423/232
Signal RS-422
Signal RS-485
Signal IBM AT Standard
RS-423/232
Signal 25-pin
Pin 9-pin
Pin
1 (1)
(1) In RS-423 mode, these pins are still connected to their RS-422 loads. Do not use these pins in RS-423
mode.
TXD- TRXD- DCD or
CD 8 1
2 RXD RXD- (3)
(3)
In RS-485 mode, these pins are still connected to their RS-422 receivers. Do not use these pins in
RS-485 mode.
RXD 3 2
3 TXD (2)
(2)
In RS-422 and RS-485 modes these pins are connected to their RS-423 drivers and receivers. Do not
use these pins in either RS-422 or RS-485 modes.
(2) TXD 2 3
4 DTR (2) (2) DTR 20 4
5 COM COM COM COM 7 5
6 DSR RXD+ (3) DSR 6 6
7 RTS (2) (2) RTS 4 7
8 CTS (2) (2) CTS 5 8
9 (1) TXD+ TRXD+ RI 22 9
IMPORTANT
The signal names on a DCE device are viewed from
a DTE perspective. For example, TXD is a DTE
output and also a DCE input.