
Shenzhen Hpmont Technology Co., Ltd.
Appendix A MODBUS Communication Protocol
HD3Z Series User Manual V1.2
-71-
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
To Rewrite Numbers of Function Parameters or Control Parameters
Function code 0x10 (set by F17.09), 0x43 (saved at power off); Command frame and response frame
are in below table (take RTU as an example).
Command frame Address Code
Starting
register address
No. of
register
Byte no. of
register content
Register
content
CRC / LRC
checking
Data frame bytes
1
1
2
2
1
2*no. of
registers
2/1
Value or range
0 - 247
0x10,
0x43
0x0000 - 0xFFFF
0x0000 -
0x0004
2*no. of registers
Response frame
Address Code
Starting register
address
No. of operation
registers
CRC checking
Data frame bytes
1
1
2
2
2/1
Value or range
1 - 247
0x10, 0x43 0x0000 - 0xFFFF
0x0000 - 0x0004
This command rewrites the contents of continuous data unit from starting register address where is
mapped as function parameter and control parameter of controller, etc. The controller will start to save
from low address to high address of the register when it continuously saves many register parameters.
The saving will return from the firstly failed address if the saving process isn’t completely successful.
A
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