Delta ASD-B2-0121-B, User Manual

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Chapter 8 MODBUS Communications
Revision June 2010
8-11
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-B2 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)