Delta Electronics AC Motor Drive VFD-G, User Manual

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Chapter 4 Parameters
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Revision July 2008, EG03, SW V1.06 4-73
™ (8 , E , 1 : 9-04=1 or 2, 9-05=04)
0 1 2 3 4 5 6 7
Start
bit
Even
parity
Stop
bit
8-bit character
11-bit character frame
™ (8, O, 1: 9-04=1 or 2, 9-05=05)
0 1 2 3 4 5 6 7
Start
bit
Odd
parity
Stop
bit
8-bit character
11-bit character frame
3. Communication Protocol
3.1 Communication Data Frame:
ASCII mode:
STX Start character ‘:’ (3AH)
ADR 1
ADR 0
Communication address:
8-bit address consists of 2 ASCII codes
CMD 1
CMD 0
Command code:
8-bit command consists of 2 ASCII codes
DATA (n-1)
…….
DATA 0
Contents of data:
N X 8-bit data consists of 2n ASCII codes.
n<=25, maximum of 50 ASCII codes
LRC CHK 1
LRC CHK 0 LRC check sum:
8-bit check sum consists of 2 ASCII codes
END 1
END 0
End characters:
END1= CR (0DH), END0= LF(0AH)
RTU mode:
START A silent interval of more than 10 ms
ADR Communication address: 8-bit address
CMD Command code: 8-bit command
DATA (n-1)
…….
DATA 0
Contents of data:
N X 8-bit data, n<=25
CRC CHK Low
CRC CHK High
CRC check sum:
16-bit check sum consists of 2 8-bit characters
END A silent interval of more than 10 ms