Serial communication ports – Honeywell UMC800 User Manual

Page 18

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Equipment Identification
Serial Communication Ports

10

UMC800 Controller Installation and User Guide

Release F

4/01

Serial Communication Ports

The controller contains dedicated serial ports for external communications. These are described in Table 2.

Table 2 Communication port descriptions

Communication

Port

(on CPU Module)

Description

Configuration

Configuration Port - This RS232 port is a dedicated connection for
communications with a PC running the Control Builder configuration program.
The communications link layer protocol is proprietary. Communication is
through a null modem cable or through a modem.

Display

This RS 422 port is a dedicated connection for communications with the
operator interface. Separate power leads included in the cable also supply
power to the operator interface. The communications link layer is proprietary
and not intended for external use.

COMM A

(with optional

communication

board)

RS 485 Serial communication port using Modbus RTU protocol. This port allows
the controller to operate as a slave device on a multi-drop bus with up to 31
other UMC800 controllers and Modbus compatible devices. A PC host can be
connected to the bus and used for controller configuration and monitoring tasks.

COMM B

(with optional

communication

board)

RS 485 Serial communication port using Modbus RTU protocol. This port allows
the controller to operate as a master device to up to 16 slave Modbus
compatible devices. Data transferred through this port is integrated into the
user’s control strategy through read and write function blocks.

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