Delta Electronics ASDA-A Series User Manual page 269

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Chapter 8 MODBUS Communications| ASDA-A&A+ Series
11-bit character frame (For 8-bit character)
8N2
Start
bit
8E1
Start
bit
8O1
Start
bit
Communication Protocol:
ASCII Mode:
STX
ADR
CMD
DATA(n-1)
.......
DATA(0)
LRC
End 1
End 0
RTU Mode:
STX
ADR
CMD
DATA(n-1)
.......
DATA(0)
CRC
End 1
8-10
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0 1 2 3
8-data bits
11-bits character frame
0 1 3
2
8-data bits
11-bits character frame
0 1 2 3
8-data bits
11-bits character frame
Start character': ' (3AH)
Communication address: 1-byte consists of 2 ASCII codes
Command code: 1-byte consists of 2 ASCII codes
Contents of data: n word = n x 2-byte consists of n x 4 ASCII codes, n≤12
Command code: 1-byte consists of 2 ASCII codes
End code 1: (0DH)(CR)
End code 0: (0AH)(LF)
A silent interval of more than 10ms
Communication address: 1-byte
Command code: 1-byte
Contents of data: n word = n x 2-byte, n≤12
Command code: 1-byte
A silent interval of more than 10ms
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4 5 6
7
4 5 6
7
4 5 6
7
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Stop
Stop
bit
bit
Even
Stop
parity
bit
Odd
Stop
parity
bit
Revision April 2009
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