Delta-electronics ASDA-B Series Manual do Utilizador descarregar pdf (Página 245)

Chapter 8 MODBUS Communications|ASDA-B Series

8-10 Revision January 2009

STX (Communication Start)

ASCII Mode: ’:’ character

RTU Mode: A silent interval of more than 10ms

ADR (Communication Address)

The valid communication addresses are in the range of 1 to 254.

For example, communication to AC servo drive with address 16 decimal:

ASCII Mode: ADR=’1’,’0’ => ‘1’=31H，’0’=30H

RTU Mode: ADR = 10H

CMD (Command Codes) and DATA (Data Characters)

The format of data characters depends on the command code. The available command codes and examples

for AC servo drive are described as follows:

Command code: 03H, read N words. The maximum value of N is 10.

For example, reading continuous 2 words from starting address 0200H of AC servo drive with address 01H.

ASCII Mode:

Command message: Response message:

STX ‘:’ STX ‘:’

‘0’ ‘0’

ADR

‘1’

ADR

‘1’

‘0’ ‘0’

CMD

‘3’

CMD

‘3’

‘0’ ‘0’

‘2’

Number of data

(Count by byte)

‘4'

‘0’ ‘0’

Starting data

address

‘0’ ‘0’

‘0’ ‘B’

‘0’

Contents of starting

data address

0200H

‘1’

‘0’ ‘1’

Number of data

‘2’ ‘F’

‘F’ ‘4’

LRC Check

‘8’

Contents of second

data address

0201H

‘0’

End 1 (0DH)(CR) ‘E’

End 0 (0AH)(LF)

LRC Check

‘8’

End 1 (0DH)(CR)

End 0 (0AH)(LF)

1 2 ... 240 241 242 243 244 245 246 247 248 249 250 ... 320 321

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