Delta VFD004L11A User Manual page 64

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VFD-L Series
RTU mode:
Command message:
3.4 CHK (check sum)
ASCII mode:
LRC (Longitudinal Redundancy Check) is calculated by summing up, module 256, the
values of the bytes from ADR1 to last data character then calculating the hexadecimal
representation of the 2's-complement negation of the sum.
For example, reading 1 word from address 0401H of the AC drive with address 01H
Starting data
address
Number of data
LRC CHK 1
LRC CHK 0
RTU mode:
Starting address
Number of data
(count by word)
CRC CHK Low
CRC CHK High
ADR 01H
CMD 06H
Data address 01H
00H
Data content 17H
70H
CRC CHK Low 86H
CRC CHK High 22H
STX ':'
ADR 1 '0'
ADR 0 '1'
CMD 1 '0'
CMD 0
'3'
'0'
'4'
'0'
'1'
'0'
'0'
'0'
'1'
'F'
'6'
END 1 CR
END 0 LF
ADR 01H
CMD 03H
21H
02H
00H
02H
6FH
F7H
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Response message:
Data address
Data content
CRC CHK Low
CRC CHK High
01H+03H+04H+01H+00H+01H=0AH, the
2's-complement negation of 0AH is F6H.
5-46
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ADR 01H
CMD 06H
01H
00H
17H
70H
86H
22H