RTU mode:

Command message:

Address

01H

Function

10H

Starting data

05H

address

00H

Number of data

00H’

(count by word)

02H

Number of data

04

(count by byte)

The first data

13H

content

88H

The second data 0FH

content

A0H

CRC Check Low

‘4D’

CRC Check High ‘D9’

Chapter 5 Parameters|VFD-B Series

Response message:

Address

01H

Function

10H

Starting data address 05H

00H

Number of data

00H

(count by word)

02H

CRC Check Low

41H

CRC Check High

04H

3.4 Check sum

ASCII mode:

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

‘:’

Address 1

‘0’

Address 0

‘1’

Function 1

‘0’

Function 0

‘3’

‘0’

Starting data address

‘4’

‘0’

‘1’

‘0’

Number of data

‘0’

‘0’

‘1’

LRC Check 1

‘F’

LRC Check 0

‘6’

END 1

CR

END 0

LF

01H+03H+04H+01H+00H+01H=0AH, the 2’s-complement negation of 0AH is F6H.

RTU mode:

Address

01H

Function

03H

Starting data address

21H

02H

Revision July 2008, BE16, SW V4.08 & V5.00

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