Veichi AC100-T3-1R5G Manual page 192

AC100 HIGH-PERFORMANCE VC INVERTER MANUAL
There is at lowest 3.5 bytes
vacancy at beginning
Command Code and Communication Data Description
●
Command code: 03 H, read N words (Word), continuously read five words at most.
For example：The frequency inverter whose slave machine address is 01 H, memory initial address is 2100H [(C-00]),
read continuously 3 words, then the structure of that frame is described as follows:
RTU host machine command information
START
Slave machine address
Command code
Start address high-order
Start address low-order
Data number high-order
Data number low-order
CRC CHK low-order
CRC CHK high-order
END
RTU Slave Machine Responding Information（normal）
START
Slave machine address
Command code
Byte number low-order
Data address 2100H high-order
Data address 2100H low-order
Data address 2101H high-order
Data address 2101H low-order
Data address 2102H high-order
Data address 21021H low-order
CRC CHK low-order
CRC CHK high-order
END
Slave Machine Responding Information（abnormal）
START
Slave machine address
Command code
Error code
CRC CHK low-order
CRC CHK high-order
END
RTU DATA FRAME FORMAT
MODBUS MESSAGE
slave machine
function code
address
Transmission time of 3.5 bytes
01H
03H
21H
00H
00H
03H
0FH
F7H
Transmission time of 3.5 bytes
Transmission time of 3.5 bytes
01H
03H
06H
13H
88H
00H
00H
00H
00H
90H
A6H
Transmission time of 3.5 bytes
Transmission time of 3.5 bytes
01H
03H
04H
21H
33H
Transmission time of 3.5 bytes
data
189
Appendix
There is at lowest 3.5 bytes
checking
vacancy at ending