Rtu Mode - Delta Electronics ASDA-A Series User Manual

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Chapter 8 MODBUS Communications| ASDA-A&A+ Series

RTU Mode:

Command message:
ADR
CMD
Starting data
address
Number of data
(Count by word)
CRC Check Low
CRC Check High
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:
STX
ADR
CMD
Starting data
address
Content of data
LRC Check
End 1
End 0
8-12
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01H
03H
02H (Upper bytes)
00H (Lower bytes)
00H
02H
C5H (Lower bytes)
B3H (Upper bytes)
':'
'0'
'1'
'0'
'6'
'0'
'2'
'0'
'0'
'0'
'0'
'6'
'4'
'9'
'3'
(0DH)(CR)
(0AH)(LF)
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Response message:
ADR
CMD
Number of data
(Count by byte)
Contents of starting
data address
0200H
Contents of second
data address
0201H
CRC Check Low
CRC Check High
Response message:
STX
ADR
CMD
Starting data
address
Content of data
LRC Check
End 1
End 0
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01H
03H
04H
00H (Upper bytes)
B1H (Lower bytes)
1FH (Upper bytes)
40H (Lower bytes)
A3H (Lower bytes)
D4H (Upper bytes)
':'
'0'
'1'
'0'
'6'
'0'
'2'
'0'
'0'
'0'
'0'
'6'
'4'
'9'
'3'
(0DH)(CR)
(0AH)(LF)
Revision April 2009
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