Chapter 8 MODBUS Communications
|
ASDA-A&A+ Series
8-12
Revision April 2009
RTU Mode:
Command message:
Response message:
ADR 01H
ADR 01H
CMD 03H
CMD 03H
02H (Upper bytes)
Starting data
address
00H (Lower bytes)
Number of data
(Count by byte)
04H
00H
00H (Upper bytes)
Number of data
(Count by word)
02H
Contents of starting
data address
0200H
B1H (Lower bytes)
CRC Check Low
C5H (Lower bytes)
1FH (Upper bytes)
CRC Check High
B3H (Upper bytes)
Contents of second
data address
0201H
40H (Lower bytes)
CRC Check Low
A3H (Lower bytes)
CRC Check High
D4H (Upper bytes)
Command code: 06H, write 1 word
For example, writing 100 (0064H) to starting data address 0200H of ASDA-A and ASDA-A+ series with
address 01H.
ASCII Mode:
Command message:
Response message:
STX ‘:’
STX ‘:’
‘0’
‘0’
ADR
‘1’
ADR
‘1’
‘0’
‘0’
CMD
‘6’
CMD
‘6’
‘0’
‘0’
‘2’
‘2'
‘0’
‘0’
Starting data
address
‘0’
Starting data
address
‘0’
‘0’
‘0’
‘0’
‘0’
‘6’
‘6’
Content of data
‘4’
Content of data
‘4’
‘9’
‘9’
LRC Check
‘3’
LRC Check
‘3’
End 1
(0DH)(CR)
End 1
(0DH)(CR)
End 0
(0AH)(LF)
End 0
(0AH)(LF)
Call 1(800)985-6929 for Sales
deltaacdrives.com
Call 1(800)985-6929 for Sales
deltaacdrives.com
