Chapter 5 Parameters_VFD-B Series
5-98
Revision 10/2005, BE13, SW V4.08
RTU mode:
Command message: Response message:
Address 01H Address 01H
Function 10H Function 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
Number of data
(count by byte)
04 CRC Check Low 41H
13H CRC Check High 04H
The first data content
88H
0FH
The second data
content
A0H
CRC Check Low ‘9’
CRC Check High ‘A’
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 ‘:’
‘0’ Address 1
Address 0
‘1’
‘0’ Function 1
Function 0
‘3’
‘0’
‘4’
‘0’
Starting data address
‘1’
‘0’
‘0’
‘0’
Number of data
‘1’
‘F’ LRC Check 1
LRC Check 0
‘6’
CR END 1
END 0
LF
01H+03H+04H+01H+00H+01H=0AH, the 2’s-complement negation of 0AH is F6H.
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