Chapter 5 Parameters
VFD-E Series
5-92 Revision August 2006, 01EE, SW--PW V1.03/CTL V2.03
Command message: Response message:
‘7’ ‘7’
LRC Check
‘1’
LRC Check
‘1’
CR CR
END
LF
END
LF
RTU mode:
Command message:
Response message:
Address 01H Address 01H
Function 06H Function 06H
01H 01H
Data address
00H
Data address
00H
17H 17H
Data content
70H
Data content
70H
CRC CHK Low 86H CRC CHK Low 86H
CRC CHK High 22H CRC CHK High 22H
3.4 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.
STX ‘:’
‘0’Address 1
Address 0
‘1’
‘0’Function 1
Function 0
‘3’
‘0’
‘4’
‘0’
Starting data address
‘1’
‘0’
‘0’
‘0’
Number of data
‘1’
‘F’LRC Check 1
LRC Check 0
‘6’
CREND 1
END 0
LF
01H+03H+04H+01H+00H+01H=0AH, the 2’s-complement negation of 0AH is F6H.
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