Shenzhen Hpmont Technology Co., Ltd.
Appendix B Communication Protocol
HD5L Series Controller User Manual V1.4
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119
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2.
Scaling of Drive Transmitting Values
Except the parameters of the remarks, all other function codes can define the scaling relationship of
the specified function code via referring the manual’s minimum unit.
Remarks:
Communication data 0 - 2000 of F06.07, F13.04, F13.05, F13.07, F13.08, F13.10, F13.11, F13.18 and F13.20
corresponds to data -1000 - +1000.
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
Not saved at power off
0x41
Saved at power off
To rewrite numbers of function parameters or control
parameters
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 - 0x0004
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
B