Delta Electronics VFD-VL manual Start, End

		Chapter 4 Parameters
RTU mode:
	START	A silent interval of more than 10 ms
	Address	Communication address: 8-bit address
	Function	Command code: 8-bit command
	DATA (n-1)	Contents of data:
	to	n×8-bit data, n<=16
	DATA 0
	CRC CHK Low	CRC check sum:
		16-bit check sum consists of 2 8-bit characters
	CRC CHK High
	END	A silent interval of more than 10 ms
3.2 Address (Communication Address)

Valid communication addresses are in the range of 0 to 254. A communication address equal to 0, means broadcast to all AC drives (AMD). In this case, the AMD will not reply any message to the master device.

00H: broadcast to all AC drives

01H: AC drive of address 01

0FH: AC drive of address 15

10H: AC drive of address 16

:

FEH: AC drive of address 254

For example, communication to AMD with address 16 decimal (10H):

ASCII mode: Address=’1’,’0’ => ‘1’=31H, ‘0’=30H

RTU mode: Address=10H

3.3 Function (Function code) and DATA (data characters)

The format of data characters depends on the function code. 03H: read data from register

06H: write single register

08H: loop detection

10H: write multiple registers

The available function codes and examples for VFD-VL are described as follows:

(1) 03H: multi read, read data from registers.

Example: reading continuous 2 data from register address 2102H, AMD address is 01H.

ASCII mode:			Response message:
	Command message:
	STX	‘:’	STX	‘:’
	Address	‘0’	Address	‘0’
		‘1’		‘1’
	Function	‘0’	Function	‘0’
		‘3’		‘3’
		‘2’	Number of data	‘0’
	Starting data	‘1’	(Count by byte)	‘4’
	address	‘0’	Content of starting	‘1’
		‘2’		‘7’
			address
	Number of data	‘0’		‘7’
			2102H
	(count by word)	‘0’		‘0’

Revision Nov. 2008, VLE1, SW V1.03 4-89