Delta Electronics AC Motor Drive VFD-G User Manual
Page 129
Chapter 4 Parameters|
4-78
Revision July 2008, EG03, SW V1.06
LRC CHK 1
‘9’
LRC CHK 0
‘A’
END 1
CR
END 0
LF
RTU mode:
Command message:
Response message:
Error response message
ADR 01H
ADR 01H
ADR 01H
CMD
10H
CMD 1
10H
CMD 1
90H
Data starting
05H
Data starting
05H
Error
02H
address
00H
address
00H
CRC CHK LOW
CDH
Number of data 00H
Number of data
00H
CRC CHK HIGH
C1H
(Word) 02H
(Word) 02H
Number of data
(Byte)
04
CRC CHK LOW
41H
The first
13H
CRC CHK HIGH
04H
data 88H
The second
0FH
data A0H
CRC CHK LOW
4DH
CRC CHK HIGH D9H
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.
STX ‘:’
ADR 1
‘0’
ADR 0
‘1’
CMD 1
‘0’
CMD 0
‘3’
‘0’
‘4’
‘0’
Data starting address
‘1’