Chapter 4 Parameters

 

DATA (n-1)

Contents of data:

 

to

Nx8-bit data consist of 2n ASCII codes

 

DATA 0

n<=16, maximum of 32 ASCII codes

 

LRC CHK Hi

LRC check sum:

 

LRC CHK Lo

8-bit check sum consists of 2 ASCII codes

 

END Hi

End characters:

 

END Lo

END1= CR (0DH), END0= LF(0AH)

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:

 

CRC CHK High

16-bit check sum consists of 2 8-bit characters

 

 

 

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

3.3Function (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-VE 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:

Command message:

 

 

Response message:

 

STX

‘:’

 

STX

‘:’

Address

‘0’

 

Address

‘0’

‘1’

 

‘1’

 

 

 

Function

‘0’

 

Function

‘0’

‘3’

 

‘3’

 

 

 

 

 

 

 

 

Starting data

‘2’

 

Number of data

‘0’

address

‘1’

 

(Count by byte)

‘4’

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Revision August 2008, 03VE, SW V2.04

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Delta Electronics VFD-VE Series manual Data, Start, End

VFD-VE Series specifications

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