Shenzhen Hpmont Technology Co., Ltd
Appendix B Communication Protocol
HD20 Series Inverters User Manual
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153
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6.
Protocol Function
1) Supported function
MODBUS protocol supports the below parameter operation:
Function code
Instructions
0x03
To read the inverter’s function parameters and parameters in operating status
0x06
To rewrite function parameter (whether can be saved by F17.09 at power off) or
control parameter of single inverter
0x08
Circuit diagnosis
0x41
To rewrite function parameter (cannot be saved at power off) or control parameter
of single inverter
0x42
Function parameters management
0x10
To rewrite function parameter (whether can be saved by F17.09 at power off) or
control parameter of certain inverters
0x43
To rewrite function parameter (can be saved at power off) or control parameter of
certain inverters
If the operation command fails, the response is fault code. For instance, continuously read 13
function codes from F00.00 then the return frame will be as follows:
Address
Parameter
Error code
Checksum
0x01
0x83
0x03
0x01
0x31
The fault code is the same as (function parameter
＋
0x80), and its instruction is as follows:
Exception code
Instructions
0x1
Illegal function parameters.
0x2
Illegal register address.
0x3
Data fault. Data is beyond the upper/lower limit.
0x4
Slave operation fails (including fault caused by data invalid).
0x16
Unsupported operation (unsupported to read the attributes, factory default and
upper/lower limit for the control parameter and status parameter).
0x17
The register number of command frame is fault.
0x18
Incorrect information frame, including incorrect information length and incorrect
checking.
0x20
Parameters cannot be modified.
0x21
Parameters are unchangeable when the inverter is in running status.
0x22
Parameters are protected by password.
B