6-3
6.1.3 Data Frame for RTU Mode
Master/Client (PLC etc.) sends request to Slave/Server (AC Drive),
and the slave/server sends a response to the master/client (PC, PLC).
The data received is illustrated here.
The data length varies depending on the command (Function).
Node Address
Function Code
DATA
CRC CHECK
Signal Interval
Note:
The AC Drive response time is 10ms
Node Address
00H: Broadcast to all the drivers
01H: to the No. 01 AC Drive
0FH: to the No.15 AC Drive
10H: to the No.16 AC Drive and so on...., max to No.
254 (FEH)
Function Code
03H: Read the register contents
06H: Write a WORD to register
08H: Loop test
10H: Write several data to register (complex number
register write)
LRC
ex. NODE ADDRESS
01H
FUNCTION 03H
COMMAND
01H
00H
+ DATA
LENGTH
0AH
------------------------------------------
0FH
------
2’s
complement
Checksum
F1H
CS (H)
46H (ASCII)
CS (L) =
31H (ASCII)
Checksum Calculation
STX(3AH)
Start Bit = 3AH
Node Address Hi
Communication Address(Station): 2-digit ASCII Code
Node Address Lo
Function Hi
Function Code (command): 2-digit ASCII Code
Function Lo
Command Start Address
Command Start byte: 4-digit ASCII Code
Command Start Address
Command Start Address
Command Start Address
Data length
The length of the command: 4-digit ASCII Code
Data length
Data length
Data length
LRC Check Hi
LRC Check Code: 2-digit ASCII Code
LRC Check Lo
END Hi
End Byte: END Hi=CR(0DH), END Li = LF(0AH)
END Lo
6.1.2 Date Format Frame for ASCII Mode