Veikong VFD500 Series Operation Manual page 106

VFD500 high performance vector control frequency inverter user manualAppendix A

Request PDU
Command code
initial address
Number of registers

Response PDU
Command code
Initial address
Number of registers

Wrong PDU
Command code
Abnormal code
Currently Modbus protocol 0x03 command code does not support cross-group read multiple function
codes, it will be wrongif more than the current group of function code number
A.3.2 Command code 0x06 write single registers or status word command codes
Request PDU
Command code
Initial address
Register value

Respond PDU
Command code
Register address
Register value

Wrong PDU
Command code
Abnormal code
A.3.3 Command 0x10write multiple registers or status word command codes

Request PDU
Command code
Initial address
Number of Register
Number of Byte
Register Value
1byte
2byte
2byte
1byte
1byte
2* nbyte
1byte
1byte
1byte
2byte
2byte
1byte
2byte
2byte
1byte
1byte
1byte
2byte
2byte
1byte
2* nbyte
- 103-
Modbus communication protocol
0x03
0x0000～0xFFFF(high 8
bit in front)
0x0001-0x0010 (1～
16,high 8 bit in front)
0x03
2n（n means Number of
registers）
Register value high 8 bit
in front,first send initial
address'register value
0x83
See A.4Abnormal
response information
0x06
0x0000～0xFFFF(high 8
bit in front)
0x0000～
0xFFFF(register value
high 8 bit in front)
0x06
0x0000～0xFFFF
0x0000～0xFFFF
0x86
See A4 Abnormal
response information
0x10
0x0000～0xFFFF(high 8
bit in front)
0x0001～0x0010(1～16,
high 8 bit in front)
2n (n is number of
Register)
Register value high 8 bit