Chapter 4 Description of Parameters | VFD-VJ
4-62
3. Communication Protocol
Communication Data Frame
ASCII mode :
STX Start character = ‘ : ’ (3AH)
Address Hi
Communication address:
8-bit address consists of 2 ASCII codes
Address Lo
Function Hi
Command code:
8-bit command consists of 2 ASCII codes
Function Lo
DATA (n-1)
Contents of data:
N x 8-bit data consist of 2n ASCII codes
N ≤ 16, maximum of 32 ASCII codes (20 sets of data)
…….
DATA 0
LRC CHK Hi
LRC check sum:
8-bit check sum consists of 2 ASCII codes
LRC CHK Lo
END Hi
End characters:
END Hi = CR (0DH), END Lo = LF (0AH)
END Lo
RTU mode:
START A silent interval of more than 10 ms
Address Communication address: 8-bit address
Function Command code: 8-bit command
DATA (n-1)
Contents of data:
N × 8-bit data, n ≤16
…….
DATA 0
CRC CHK Low
CRC check sum:
16-bit check sum consists of 2 8-bit characters
CRC CHK High
END A silent interval of more than 10 ms
Communication Address (Address)
00H: broadcast to all hybrid servo drives
01H: hybrid servo drive of address 01
0FH: hybrid servo drive of address 15
10H: hybrid servo drive of address 16
:
FEH: Hybrid servo drive of address 254
Function code (Function) and DATA (Data characters)
03H: read data from register
06H: write single register
Example: reading continuous 2 data from register address 2102H, AMD address is 01H.
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