Delta Electronics ASDA-B Series manual RTU Mode Command message Response message, Adr Cmd

Chapter 8 MODBUS CommunicationsASDA-B Series

RTU Mode:

Command message: Response message:

ADR	01H
CMD	03H
Starting data	02H (Upper bytes)
address	00H (Lower bytes)
Number of data	00H
(Count by word)	02H
CRC Check Low	C5H (Lower bytes)
CRC Check High	B3H (Upper bytes)

Command code: 06H, write 1 word

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

01H

03H

04H

00H (Upper bytes) B1H (Lower bytes) 1FH (Upper bytes) 40H (Lower bytes) A3H (Lower bytes) D4H (Upper bytes)

For example, writing 100 (0064H) to starting data address 0200H of ASDA-B series with address 01H.

ASCII Mode:

Command message:

STX	‘:’
ADR	‘0’
	‘1’
CMD	‘0’
	‘6’
	‘0’
Starting data	‘2’
address	‘0’
	‘0’
	‘0’
Content of data	‘0’
	‘6’
	‘4’
LRC Check	‘9’
	‘3’
End 1	(0DH)(CR)
End 0	(0AH)(LF)

Response message:

STX	‘:’
ADR	‘0’
	‘1’
CMD	‘0’
	‘6’
	‘0’
Starting data	‘2'
address	‘0’
	‘0’
	‘0’
Content of data	‘0’
	‘6’
	‘4’
LRC Check	‘9’
	‘3’
End 1	(0DH)(CR)
End 0	(0AH)(LF)

Revision January 2009 8-11