Honeywell UMC800 manual Serial Communication Ports, Communication port descriptions

Equipment Identification

Serial Communication Ports

Serial Communication Ports

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

Communication

Port

(on CPU Module)

Configuration

Display

COMM A

(with optional

communication

board)

COMM B

(with optional

communication

board)

Table 2 Communication port descriptions

Description

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.

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.

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.

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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