Section 1 - Overview; Introduction - Honeywell UDC2300 Product Manual

1.1

Introduction

The communications
option
Monitor or slave mode
Message exchanges
10/00 RS422/485 ASCII Communications Option Product Manual
Section 1 – Overview
The RS422/485 Communications Option on the UDC2300 Controller
provides a serial multi-drop link whereby up to 31 UDC controllers
connect directly to a host computer.
The UDC controller can be placed in monitor or slave by the host
computer. When monitored, the controller will send Configuration,
Tuning, and Operating parameters to the host computer. When in slave,
the controller will be switched through the communications interface
board to "Slave" operation. This means that the computer can write
configuration or tuning information into any controller on the link
including overriding of PV, the setpoint, and output.
The computer and the controllers talk to each other through a series of
message exchanges. There are two RS422/485 message exchange
protocols: Configuration or Loopback.
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