Section 3 - Establishing Communications And Testing; Preparing The Controller For Communications; Table 3-1 Communications Parameters - Honeywell UDC2300 Product Manual

Section 3 – Establishing Communications and Testing
3.1

Preparing the Controller for Communications

Introduction
Synchronization
Configurable
parameters
10/00 RS422/485 ASCII Communications Option Product Manual
Each controller on the RS422/485 Communications link must be
configured at the controller level for certain parameters before
communications between the Host and the Controller can be
accomplished.
Before you attempt to exchange messages between your computer and the
controllers on the RS422/485 link, you must set up the controller for the
same form of data transmission that the host computer's RS422/485
interface uses. This is called Synchronization.
You must match the controller Baud Rate and Parity with that of your
computer.
Table 3-1 is a list of parameters that should be configured with their
definitions and range of settings or selections. The procedure for entering
the information into the controller is found in Table 3-2.
Table 3-1 Communications Parameters
Parameter
Communications Enables or disables the Communication function in the
State controller.
Communications This is a number that is assigned to a controller (limited
Address to 31 controllers) that will be used during
communications. This number will be its address on the
link (address 0-99).
Shed Enable Term used to describe a point in time when the controller,
which had been working as a slave, reverts to an
independent, stand alone controller using its own inputs,
configuration data and control mode. Shed will happen
when a controller is in slave, the shed is not zero, and the
communication stops.
This selection enables or disables the Shed function.
Shed Time The number selected will represent how many sample
periods will elapse before the controller sheds from
computer control. Each period equals 1/3 second. 0 = No
shed.
Definition
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