03 (0X03) Read Holding Registers" Function - Toshiba TOSVERT VF-AS3 Instruction Manual

3.4. "03 (0x03) Read Holding Registers" function

This Modbus request is used to read a value continuously from contiguous inverter parameters.
Request Format:
Byte
0 Function Code = 0x03
1 Communication No. of Starting Parameter Hi
2 Communication No. of Starting Parameter Lo
3 Number of Parameters Hi (0)
4 Number of Parameters Lo (1 - 125)
Response format:
Byte
0 Function Code = 0x03
1 Byte Count (B = 2 × Number of Points)
2 First Parameter Data Hi
3 First Parameter Data Lo
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B Last Parameter Data Hi
B+1 Last Parameter Data Lo
Exception response format:
Byte
0 Function Code = 0x83
Exception Code
1: Illegal Function
1
2: Illegal Data Address
3: Illegal Data Value
If the communication number that doesn't exist is read, device returns 0x8000.
Meaning
Meaning
Meaning
Notes
27
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