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CL3-E CANopen/USB Technical Manual

ConfigurationModbus RTU Parent topic: Modbus RTU

General

In general Modbus is based on big endian coding.

The only exception are the commands with the function code 2Bh, 64h and 65h, which are based on CANopen. The data of these commands is coded in little endian. The message itself is still big endian coded.

Example
 

Example command 2Bh: The value 12345678h will be written in the (nonexistent) object 0123h:

SA
Slave address
FC
Function code
Data
Data area, decoding depending on the used function code
CRC
Cyclic redundancy check
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