Xinje VH6 Series - Page 225

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Start
bit
0
1
2
3
4
5
6
7
Odd
parity
Stop
bit
(1－8－1, even parity)
Start
bit
0
1
2
3
4
5
6
7
Even
parity
Stop
bit
(1－8－1, no parity)
Start
bit
0
1
2
3
4
5
6
7
Stop
bit
Appendix B-3-2. Communication data structure
RTU mode
START
Keep no input signal at least 10ms
Address
Communication address: 8-bit binary address
Function
Function code: 8-bit binary address
DATA（n-1）
Data content: N*8-bit data, N<=8, max 8 bytes
……………
DATA 0
CRC CHK Low
CRC parity
CRC CHK High
16-bit CRC parity code is composed of two 8-bit binary
END
Keep no IO signal at least 10ms
Communication address
00H: all frequency converter broadcast
01H: communicate with 01 address inverter.
0FH: communication with 15 address inverter.
10H: communication with 16 address inverter. And so on... , up to 254 (FEH).
Function code and data
Function
code
Explanation
03H
Read the contents of registers, read multiple registers, but not more than 12 at a
time, each time can only read the same group of data
06H
Write data into the register
08H
Loop detection
(1) Function code 03H: read register
For example, read the register address 7000H (operation frequency).
RTU mode
Format of inquiry information
Format of response information
Address
01H
Address
01H
Function code
03H
Function code
03H
Register address
70H
Byte number
02H
00H