Delta Electronics Network Device VFD-S Especificaciones descargar pdf (Pagina 70)

VFD-S Series

5-53

RTU mód:

Command message: Response message:

ADR 01H ADR 01H

CMD 10H CMD 10H

05H 05H Starting Data

address

00H

Starting Data

address

00H

00H 00H Number of data

(count by word)

02H

Number of data

(count by word)

02H

CRC CHK Low 41H Number of data

(count by Byte)

04H

CRC CHK High 04H

17H Data content of

address 0500H

70H

03H Data content of

address 0501H

E8H

CRC CHK Low C8H

CRC CHK High 2EH

3.4 CHK (check sum)

ASCII mód:

LRC (Longitudinal Redundancy Check) is calculated by summing up, module 256, the

values of the bytes from ADR1 to last data character then calculating the hexadecimal

representation of the 2’s-complement negation of the sum.

For example, reading 1 word from address 0401H of the AC drive with address 01H

STX ‘:’

‘0’ ADR 1

ADR 0

‘1’

‘0’ CMD 1

CMD 0

‘3’

‘0’

‘4’

‘0’

Starting data

address

‘1’

‘0’

Number of data

‘1’

‘F’ LRC CHK 1

LRC CHK 0

‘6’

CR END 1

END 0

01H+03H+04H+01H+00H+01H=0AH, the

2’s-complement negation of 0AH is F6H.

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 129 130

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Delta Electronics Network Device VFD-S Especificaciones Pagina 70

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