CET Electric Technology
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Chapter 5 Modbus Register Map
This chapter provides a complete description of the Modbus register map (Protocol Version 1.0) for
the PMC-33M-A to facilitate the development of 3
rd
party communications driver for accessing
information on the PMC-33M-A. For a complete Modbus Protocol Specification, please visit
http://www.modbus.org. The PMC-33M-A supports the following Modbus functions:
1) Read Holding Registers (Function Code 0x03)
2) Force Single Coil (Function Code 0x05)
3) Preset Multiple Registers (Function Code 0x10)
The following table provides a description of the different data formats used for the Modbus registers.
The PMC-33M-A uses the Big Endian byte ordering system.
Unsigned/Signed 16-bit Integer
Unsigned/Signed 32-bit Integer
Single Precision Floating Point Number
5.1 Basic Measurements
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