Delta Electronics AC Motor Drive VFD-EL User Manual
Page 134
Chapter 4 Parameters|
Revision August 2008, 2ELE, V1.02
4-91
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’
CR
END 1
END 0
LF
01H+03H+04H+01H+00H+01H=0AH, the 2’s-complement negation of 0AH is F6H.
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