Chapter 4 Parameters

Command code: 03H, read N words. The maximum value of N is 12. For example, reading continuous 2 words from starting address 2102H of AMD with address 01H.

ASCII mode:

Command message:

STX

‘:’

ADR 1

‘0’

ADR 0

‘1’

CMD 1

‘0’

CMD 0

‘3’

 

‘2’

Starting data address

‘1’

‘0’

 

 

‘2’

 

‘0’

Number of data

‘0’

(count by word)

‘0’

 

‘2’

LRC CHK 1

‘D’

LRC CHK 0

‘7’

END 1

CR

END 0

LF

Response message:

STX

‘:’

ADR 1

‘0’

ADR 0

‘1’

CMD 1

‘0’

CMD 0

‘3’

Number of data

‘0’

(count by byte)

‘4’

Content of starting

‘1’

data address

‘7’

2102H

 

‘7’

 

 

‘0’

 

‘0’

Content of data address

‘0’

2103H

‘0’

 

‘0’

LRC CHK 1

‘7’

LRC CHK 0

‘1’

END 1

CR

END 0

LF

RTU mode:

Command message:

ADR

01H

CMD

03H

Starting data address

21H

 

02H

Number of data

00H

(count by word)

02H

CRC CHK Low

6FH

CRC CHK High

F7H

Response message:

ADR

01H

CMD

03H

Number of data

04H

(count by byte)

 

 

 

Content of data address

17H

2102H

70H

 

Content of data address

00H

2103H

00H

 

CRC CHK Low

FEH

CRC CHK High

5CH

Revision May 2008, ME14, SW V3.04

4-63

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Delta Electronics VFD-M manual Stx Adr, Lrc Chk, 6FH, F7H, Feh, 5CH