About these examples, Appendix a, Appendix – Rockwell Automation 1734-485ASC POINT I/O ASCII User Manual User Manual
Page 61: Serial port connector
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Publication 1734-UM009B-EN-P - July 2003
Appendix
B
Using the ASCII Modules with the
ControlLogix System Application Examples
About These Examples
For these application examples, the 1734-PDN POINT I/O interface
was used to interface with the DeviceNet network. The ASCII modules
act as a normal slave to the master scanner. The data that is sent
to/from the scanner contains the ASCII data and some specialty bytes.
Serial Port Connector
The ASCII devices are connected to the ASCII modules via a:
· 3-wire communications cable for the RS-232 network.
· 2-wire communications cable for the RS-485 network.
· 4-wire communications cable for the RS-422 network.
Table B.1 Module Terminations
Terminal
RS-232
RS-485
RS-422
0
Tx
1
S+
1
Tx+
1
1
Rx
2
NC
Rx+
1
2
NC
S-
2
Tx-
2
3
NC
NC
Rx-
2
4
NC
NC
NC
5
NC
NC
NC
6
NC
CG
CG
7
SG
SG
SC
1 S+ and Tx+ are transmit from the module
2 S- and Rx- are receive into the module