Delta Electronics VFD-EL manual For RTU

Chapter 4 Parameters

For RTU:

	( 8.N.2 )
		Start			0	1			2			3	4	5	6		7		Stop		Stop
			bit																bit		bit
										8-bit character
									11	-bit character frame
		( 8.E.1 )																	Even
		Start			0	1			2			3	4	5	6		7				Stop
			bit																parity		bit
										8-bit character
									11	-bit character frame
	( 8.O.1 )
		Start			0	1			2			3	4	5	6		7		Odd		Stop
			bit																parity		bit
										8-bit character
									11	-bit character frame
( 8.N.1 )
Start				0		1			2		3	4	5	6		7		Stop
	bit																	bit
									8-bit character
							10	-bit character frame
( 8.E.2 )																		Even Stop				Stop
Start				0		1			2		3	4	5	6		7
	bit																	parity		bit		bit
									8-bit character
							12	-bit character frame
( 8.O.2 )																				Stop
Start				0		1			2		3	4	5	6		7		Odd				Stop
	bit																	parity		bit		bit

8-bit character

12-bit character frame

3.Communication Protocol

3.1Communication Data Frame:

ASCII mode:

STX	Start character ‘:’ (3AH)
Address Hi	Communication address:
	8-bit address consists of 2 ASCII codes
Address Lo
Function Hi	Command code:
	8-bit command consists of 2 ASCII codes
Function Lo
DATA (n-1)	Contents of data:
to	Nx8-bit data consist of 2n ASCII codes
DATA 0	n<=20, maximum of 40 ASCII codes

Revision August 2008, 2ELE, V1.02 4-87