Chapter 5 ParametersVFD-S Series

( 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

3.Communication Protocol

3.1Communication Data Frame:

ASCII mode:

STX

Start character ‘:’ (3AH)

ADR 1

Communication address:

ADR 0

8-bit address consists of 2 ASCII codes

CMD1

Command code:

CMD0

8-bit command consists of 2 ASCII codes

DATA (n-1)

Contents of data:

 

n x 8-bit data consist of 2n ASCII codes.

…….

n <= 25maximum of 50 ASCII codes

DATA 0

LRC CHK 1

LRC check sum:

LRC CHK 0

8-bit check sum consists of 2 ASCII codes

END1

End characters:

END0

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

RTU mode:

 

START

A silent interval of more than 10 ms

ADR

Communication address: 8-bit address

 

 

CMD

Command code: 8-bit command

DATA (n-1)

Contents of data:

…….

n x 8-bit data, n<= 25

DATA 0

 

 

 

CRC CHK

CRC check sum:

Low

CRC CHK

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

High

 

END

A silent interval of more than 10 ms

 

 

Revision August 2006, SE08, SW V2.61

5-65

Page 122
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