Veikong VFD500 Series User Manual page 144

VFD500 high performance vector control frequency inverter user manual Appendix A Modbus communication protocol
A.3.1 Command code 0x03 Read multiple registers or status words
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 wrong if 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* n byte
1byte
1byte
1byte
2byte
2byte
1byte
2byte
2byte
1byte
1byte
1byte
2byte
2byte
1byte
2* n byte
- 142-
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