Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 427)

D Appendix
D–1
Understanding the Communication Protocols
Use the information in this appendix to understand the differences in
communication protocols. The following protocols are supported from the
RS-232 communication channel:
•
DF1 Full-Duplex and DF1 Half-Duplex Slave
All MicroLogix 1000 controllers support the DF1 full-duplex protocol.
Series D or later discrete and all MicroLogix 1000 analog controllers also
support DF1 half-duplex slave protocol. Note that the MicroLogix 1000
HHP cannot be used to select or configure the DF1 half-duplex slave
protocol.
•
DH-485
Series C or later discrete and all MicroLogix 1000 analog controllers can
communicate on DH-485 networks using an AIC+ Advanced Interface
Converter.
For information about required network connecting equipment, see chapter 3,
Connecting the System.
RS-232 is an Electronics Industries Association (EIA) standard that specifies
the electrical, mechanical, and functional characteristics for serial binary
communication. It provides you with a variety of system configuration
possibilities. (RS-232 is a definition of electrical characteristics; it is not a
protocol.)
One of the biggest benefits of the 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). The distance over which you are
able to communicate with certain system devices is virtually limitless.
RS-232 Communication
Interface