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1.1 PRINCIPAL FEATURES

The System 57 MODBUS Interface provides a facility for digital

communication between the System 57 Control System and an external

computer system. MODBUS is a well supported digital data

communication protocol which provides a set of standard commands

by which system data can be communicated. Two different interface

modules are available to support the most widely used electrical

interface standards, thereby ensuring compatibility with most external

systems. Using the MODBUS Interface it is possible to read

configuration, alarm status and other information from any channel in

the rack and to perform calibration and other procedures.

The MODBUS Interface is commonly used to connect the System 57

Control System to plant control systems to provide central monitoring

of system status often with graphical display.

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