Chziri ZVF200-M User Manual page 79

RTU Mode:
Command message
ADR
01H
CMD
10H
00H
Starting data address
11H
00H
Number of data
(count by word)
02H
Number of data
04H
(count by byte)
13H
The first data
content
88H
0FH
The second data
content
A0H
CRC CHK Low B2H
CRC CHK High
49H
3.5 CHK (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.
-152-
Appendix
Response message:
ADR
01H
CMD
10H
00H
Starting data address
11H
00H
Number of data
(count by word)
02H
CRC CHK Low 11H
CRC CHK High
CDH
STX
':'
'0'
ADR 1
ADR 0
'1'
'0'
CMD 1
CMD 0
'3'
'0'
'4'
Starting data address
'0'
'1'
'0'
'0'
Number of data
'0'
'1'
'F'
LRC CHK 1
LRC CHK 0
'6'
CR
END 1
END 0
LF
RTU mode:
ADR
01H
CMD
03H
21H
Starting address
02H
00H
Number of data
(count by word)
02H
CRC CHK Low
6FH
CRC CHK High
F7H
-153-
Appendix
01H+03H+04H+01H+00H+01H=0AH,
the 2's-complement negation of 0AH
is F6H.