Appendix B Communication Protocol
Shenzhen Hpmont Technology Co., Ltd
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154
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HD20 Series Inverters User Manual
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
④
Circuit diagnosis (function code 0x08)
Protocol data unit
Length of data (byte)
Range
Command frame
Address
1
0
－
247, 0 is broadcast address
Function code
1
0x08
Subfunction code
2
0x0000
－
0x0030
Data
2
0x0000
－
0xFFFF
CRC /LRC checking
2/1
Response frame
Address
1
1
－
247
Function code
1
0x08
Subfunction code
2
0x0000
－
0x0030
Data
2
0x0000
－
0xFFFF
CRC /LRC checking
2/1