Ascii Mode - Delta Electronics ASDA-A Series User Manual

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STX (Communication Start)
ASCII Mode: ':' character
RTU Mode: A silent interval of more than 10ms
ADR (Communication Address)
The valid communication addresses are in the range of 1 to 254.
For example, communication to AC servo drive with address 16 decimal:
ASCII Mode: ADR='1','0' => '1'=31H，'0'=30H
RTU Mode: ADR = 10H
CMD (Command Codes) and DATA (Data Characters)
The format of data characters depends on the command code. The available command codes and examples
for AC servo drive are described as follows:
Command code: 03H, read N words. The maximum value of N is 10.
For example, reading continuous 2 words from starting address 0200H of AC servo drive with address 01H.

ASCII Mode:

Command message:
STX
ADR
CMD
Starting data
address
Number of data
LRC Check
End 1
End 0
Revision April 2009
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Chapter 8 MODBUS Communications|ASDA-A&A+ Series
':'
'0'
'1'
'0'
'3'
'0'
'2'
'0'
'0'
'0'
'0'
'0'
'2'
'F'
'8'
(0DH)(CR)
(0AH)(LF)
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Response message:
STX
ADR
CMD
Number of data
(Count by byte)
Contents of starting
data address
0200H
Contents of second
data address
0201H
LRC Check
End 1
End 0
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':'
'0'
'1'
'0'
'3'
'0'
'4'
'0'
'0'
'B'
'1'
'1'
'F'
'4'
'0'
'E'
'8'
(0DH)(CR)
(0AH)(LF)
8-11
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