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Rockwell Automation Publication 1766-UM001O-EN-P - September 2021
175
Appendix
E
Connect to Networks via RS-232/RS-485
Interface
The following protocols are supported from the RS-232/RS-485 combination
communication channel (Channel 0) and the RS-232 communication channel
(Channel 2):
•
DF1 Full Duplex
•
DF1 Half-Duplex Master/Slave
•
DF1 Radio Modem
•
DH-485
•
Modbus RTU Master/Slave
•
ASCII
•
DNP3 Slave
RS-232 Communication
Interface
The communications port on Channel 0 of the MicroLogix 1400 controller
utilizes a combined, isolated RS-232/RS-485 interface. RS-232 and RS-485 are
Electronics Industries Association (EIA) standards that specify the electrical
and mechanical characteristics for serial binary communication. They provide
a variety of system configuration possibilities (RS-232 and RS-485 define
electrical connection characteristics, not
protocols).
The MicroLogix 1400 controller supports an additional, non-isolated RS-232
interface on Channel 2. One of the biggest benefits of an RS-232 interface is
that it lets you integrate telephone and radio modems into your control system
(using the appropriate DF1 protocol only, not DH-485 protocol), but it is for
point-to-point connections only between two devices.
RS-485 Communication
Interface
The RS-485 interface supports connection of devices in a multi-drop hard-
wired configuration using DH-485, DF1-Half Duplex, Modbus, or DNP3
protocols. Also, the RS-485 interface supports connection in a multi-drop hard-
wired configuration using ASCII protocols.
Topic
Page
RS-232 Communication Interface
RS-485 Communication Interface
Distributed Network Protocol (DNP3)
Summary of Contents for 1766-L32AWA
Page 10: ...10 Rockwell Automation Publication 1766 UM001O EN P September 2021 Table of Contents Notes ...
Page 302: ...302 Rockwell Automation Publication 1766 UM001O EN P September 2021 Glossary Notes ...
Page 308: ...308 Rockwell Automation Publication 1766 UM001O EN P September 2021 Index Notes ...