Rockwell Automation 2755 Enhanced Decoder Series B - Manual (Page 32)

3–2 Overview of Decoder Operations
Publication 2755-833
•
set host communication parameters
•
define up to 8 primary and 128 extended match codes
•
specify up to eight discrete outputs and the conditions that will
activate each output
•
set display format for data on LCD display and/or AUX port
terminal
•
define operating parameters for AUX port ASCII terminal when
used for manual data entry
Configuration Screens
The decoder has built-in menus and screens for configuration and
monitoring operations. You access these menus by connecting one of
several standard ASCII terminals (or a computer emulating one of
those terminals) to the AUX port of the decoder. The process of
configuring the decoder at the AUX port is called AUX terminal
configuration.
The configuration menus support five different languages: English,
French, German, Italian, and Spanish.
Host Commands
The decoder also supports a set of host commands for configuring
the decoder and monitoring operations. Host commands are sent to
the decoder from a PLC controller or computer and perform the
same functions as the configuration software.
The HOST port accepts commands using the RS-232 and RS-422
interfaces and a variety of communication protocols, as well as the
RS-485 interface using Allen-Bradley DH485 protocol. Appendix F
lists the protocol options for each interface.
The decoder can operate as a stand-alone device or connected to a
host device. As a stand-alone device, the decoder uses output
modules to control external devices. The decoder sends discrete
output signals to external control equipment based on the results of
decoded data.
The discrete outputs can be controlled remotely by host commands
or manually via the configuration screens.
Chapter 7 provides information on how to control the discrete I/O.
Appendixes G and H show various examples of input and output
module connections.
Stand-alone Operation