Appendix C Communication Protocol Shenzhen Hpmont Technology Co., Ltd
―184― HD30 Series Inverters User Manual
Exception code Instructions
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.
2) The command and response frame of MODBUS protocol parameter (in RTU mode)
①
To read inverter parameters (function code 0x03)
Protocol data unit Length of data (byte) Range
Command frame
Address 1 0－247, 0 is broadcast address
Function code 1 0x03
Starting register address 2 0x0000－0xFFFF
No. of register 2 0x0001－0x000C
CRC/LRC checking 2/1
Response frame
Address 1 1－247
Function code 1 0x03
Read byte no. 1 2* no. of registers
Register content 2* no. of registers
CRC/LRC checking 2/1
②
To rewrite function parameter (whether can be saved by F17.09 at power off) or control
parameter (function code 0x06) of single inverter (function code 0x06)
③
To rewrite function parameter (cannot be saved at power off) or control parameter of single
inverter (function code 0x41)
Protocol data unit Length of data (byte) Range
Command frame
Address 1 0－247, 0 is broadcast address
Function code 1 0x06. 0x41
Register address 2 0x0000－0xFFFF
Register content 2 0x0000－0xFFFF
CRC/LRC checking 2/1
Response frame
Address 1 1－247
Function code 1 0x06. 0x41
Register address 1 0x0000－0xFFFF
Register content 2 0x0000－0xFFFF
CRC/LRC checking 2/1
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