Delta Electronics ASDA-AB „ Communication Protocol Ascii Mode, Stx, Cmd, DATA0 LRC, DATA0 CRC

Chapter 8 MODBUS CommunicationsASDA-AB Series
11-bit character frame (For 8-bit character)
8N2
	Start	0	1	2		3		4	5	6	7	Stop	Stop
	bit											bit	bit
							8-data bits
8E1					11-bits character frame
	Start	0	1	2		3		4	5	6	7	Even	Stop
	bit											parity	bit
							8-data bits
8O1					11-bits character frame
	Start	0	1	2		3		4	5	6	7	Odd	Stop
	bit											parity	bit

8-data bits

11-bits character frame

„Communication Protocol: ASCII Mode:

STX	Start character’: ’ (3AH)
ADR	Communication address: 1-byte consists of 2 ASCII codes
CMD	Command code: 1-byte consists of 2 ASCII codes
DATA(n-1)
…….	Contents of data: n word = n x 2-byte consists of n x 4 ASCII codes, n≤12
DATA(0)
LRC	Command code: 1-byte consists of 2 ASCII codes
End 1	End code 1: (0DH)(CR)
End 0	End code 0: (0AH)(LF)
RTU Mode:
STX	A silent interval of more than 10ms
ADR	Communication address: 1-byte
CMD	Command code: 1-byte
DATA(n-1)
…….	Contents of data: n word = n x 2-byte, n≤12
DATA(0)
CRC	Command code: 1-byte
End 1	A silent interval of more than 10ms

8-10 Revision January 2009