Lrc (Ascii Mode) - Delta Electronics ASDA-A Series User Manual

Call 1(800)985-6929 for Sales
RTU Mode:
Command message:
ADR
CMD
Starting data
address
Content of data
CRC Check Low
CRC Check High

LRC (ASCII Mode):

LRC (Longitudinal Redundancy Check) is calculated by summing up, module 256, the values of the bytes
from ADR 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 0201H of the ASDA-A and ASDA-A+ series AC servo drive with
address 01H.
STX
ADR
CMD
Starting data address
Number of data
LRC Check
End 1
End 0
01H+03H+02H+01H+00H+01H = 08H, the 2's complement negation of 08H is F8H.
Hence, we can know that LRC CHK is 'F','8'.
Revision April 2009
Call 1(800)985-6929 for Sales
deltaacdrives.com
Chapter 8 MODBUS Communications|ASDA-A&A+ Series
01H
06H
02H (Upper bytes)
00H (Lower bytes)
00H (Upper bytes)
64H (Lower bytes)
89H (Lower bytes)
99H (Upper bytes)
':'
'0'
'1'
'0'
'3'
'0'
'2'
'0'
'1'
'0'
'0'
'0'
'1'
'F'
'8'
(0DH)(CR)
(0AH)(LF)
deltaacdrives.com
Response message:
ADR
CMD
Starting data
address
Content of data
CRC Check Low
CRC Check High
sales@deltaacdrives.com
01H
06H
02H (Upper bytes)
00H (Lower bytes)
00H (Upper bytes)
64H (Lower bytes)
89H (Lower bytes)
99H (Upper bytes)
8-13
sales@deltaacdrives.com