Chapter 4 Parameters

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LRC CHK 1

 

‘9’

 

 

 

 

 

 

 

 

LRC CHK 0

 

‘A’

 

 

 

 

 

 

 

 

END 1

CR

 

 

 

 

 

 

 

 

END 0

 

LF

 

 

 

 

 

 

 

 

RTU mode:

 

 

 

 

 

 

 

 

 

 

Command message:

 

Response message:

 

 

Error response message

 

ADR

01H

 

ADR

 

01H

 

ADR

01H

 

 

 

 

 

 

 

 

 

 

 

CMD

10H

 

CMD 1

 

10H

 

CMD 1

90H

 

Data starting

05H

 

Data starting

 

05H

 

Error

02H

 

address

00H

 

address

 

00H

 

CRC CHK LOW

CDH

 

Number of data

00H

 

Number of data

 

00H

 

CRC CHK HIGH

C1H

 

 

 

 

 

 

 

 

 

 

 

(Word)

02H

 

(Word)

 

02H

 

 

 

 

Number of data

04

 

CRC CHK LOW

 

41H

 

 

 

 

(Byte)

 

 

 

 

 

 

 

 

 

 

The first

13H

 

CRC CHK HIGH

 

04H

 

 

 

 

data

88H

 

 

 

 

 

 

 

 

The second

0FH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

data

A0H

 

 

 

 

 

 

 

 

CRC CHK LOW

4DH

 

 

 

 

 

 

 

 

CRC CHK HIGH

D9H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3.4CHK (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

‘:’

ADR 1

‘0’

ADR 0

‘1’

CMD 1

‘0’

CMD 0

‘3’

 

 

Data starting address

‘0’

 

‘4’

 

‘0’

 

 

 

‘1’

4-78

Revision July 2008, EG03, SW V1.06

Page 129
Image 129
Delta Electronics VFD-G manual 0FH