Shenzhen Hpmont Technology Co., Ltd. Chapter 9 MODBUS Communication Protocol
HD09 Series User Manual V1.1 -65-
Exception code Instructions
0x21 Parameters are unchangeable when the controller is in running status.
0x22 Parameters are protected by password.
For example: Write slave 2 frequency setting channel selection F00.10 (range 0x00-0x04), register
contents write 0x08 is overrun. The error code is 0x86 (0x06 + 0x80) and the exception code should be
0x03.
Address Code Register address Register contents Checksum
Request
frame
0x02 0x06 0x00 0x0A 0x00 0x08 0xa8 0x3D
Address Error code Exception code Checksum
Response
frame
0x02 0x86 0x03 0xF2 0x61
9.4 Address Mapping Relationship
The function parameters, control parameters and status parameters of the HD09 can be mapped to
MODBUS read and write registers.
9.4.1 Function Parameters Address Mapping
The group number of the HD09 function parameter is mapped to the high byte of the register address.
The correspondence relationship is shown in the following table. The intra-group index is mapped to
the low byte of the register address. The index of the function parameter F00 - F23 refers to the user
manual.
Register address high
byte
Group
No
Register address high
byte
Group
No
Register address high
byte
Group
No
0x00 F00 0x06 F06 0x12 F18
0x01 F01 0x08 F08 0x13 F19
0x02 F02 0x09 F09 0x14 F20
0x03 F03 0x0f F15 0x17 F23
0x04 F04 0x10 F16
0x05 F05 0x11 F17
For example, the register address of function parameter F03.02 is 0x0302 and the register address of
function parameter F16.01 is 0x1001.
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