Delta Electronics VFD-G manual Ascii mode, RTU mode

Chapter 4 Parameters

™(8 , E , 1 : 9-04=1 or 2, 9-05=04)

Start	0	1	2	3	4	5	6	7	Even Stop
bit									parity bit

8-bit character

11-bit character frame

™(8, O, 1: 9-04=1 or 2, 9-05=05)

Start	0	1	2	3	4	5	6	7	Odd	Stop
bit									parity	bit

8-bit character

11-bit character frame

3.Communication Protocol

3.1Communication Data Frame:

ASCII mode:

STX	Start character ‘:’ (3AH)
ADR 1	Communication address:
ADR 0	8-bit address consists of 2 ASCII codes
CMD 1	Command code:
	8-bit command consists of 2 ASCII codes
CMD 0
DATA (n-1)	Contents of data:
…….	N X 8-bit data consists of 2n ASCII codes.
	n<=25, maximum of 50 ASCII codes
DATA 0
LRC CHK 1	LRC check sum:
LRC CHK 0	8-bit check sum consists of 2 ASCII codes
END 1	End characters:
END 0	END1= CR (0DH), END0= LF(0AH)
RTU mode:
START	A silent interval of more than 10 ms
ADR	Communication address: 8-bit address
CMD	Command code: 8-bit command
DATA (n-1)	Contents of data:
	N X 8-bit data, n<=25
…….
DATA 0
CRC CHK Low	CRC check sum:
CRC CHK High	16-bit check sum consists of 2 8-bit characters
END	A silent interval of more than 10 ms

Revision July 2008, EG03, SW V1.06 4-73