Shenzhen Hpmont Technology Co., Ltd. Appendix B Communication Protocol
HD3N Series User Manual V1.1 - 145 -
3. Protocol Function
Supported function
MODBUS protocol supports the below parameter operation:
Supported function Code Instructions
To read function parameters and status
parameter
0x03
To rewrite single function parameter or
control parameter
0x06 Set by F17.09
0x41 Not saved at power off
To rewrite numbers of function
parameters or control parameters
0x10 Set by F17.09
0x43 Saved at power off
To read function parameters and status parameter
Function code 0x03, command Frame and response Frame are in below table (Take RTU as an
example).
Command
Frame
Address Code
Starting register
address
No. of register
CRC/LRC
checking
Data Frame
bytes
1 1 2 2 2/1
Value or range 0 - 247 0x03 0x0000 - 0xFFFF 0x0001 - 0x000C
Response
Frame
Address Code Read byte no. Register content
CRC/LRC
checking
Data Frame
bytes
1 1 1 2* no. of registers 2/1
Value or range 1 - 247 0x03 2* no. of registers
To rewrite single function parameter or control parameter
Function code 0x06 (set by F17.09), 0x41 (Not saved at power off); command Frame and response
Frame are in below table (Take RTU as an example).
。
Command
Frame
Address Code Register address Register content
CRC/LRC
checking
Data Frame
bytes
1 1 2 2 2/1
Value or range 0 - 247 0x06, 0x41 0x0000 - 0xFFFF 0x0000 - 0xFFFF
Response
Frame
Address Code Register address Register content
CRC/LRC
checking
Data Frame
bytes
1 1 2 2 2/1
Value or range 1 - 247 0x06, 0x41 0x0000 - 0xFFFF 0x0000 - 0xFFFF
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