Filter
Top Products
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.