Chapter 11 Description of Parameter Settings
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C200 Series
11-124
‘0’ ‘E’
Number of data
(count by byte)
‘4’
LRC Check
‘8’
‘1’ CR
‘3’
END
LF
‘8’
The first data content
‘8’
‘0’
‘F’
‘A’
The second data content
‘0’
‘9’
LRC Check
‘A’
CR
END
LF
RTU mode:
Command Message:
Response Message
ADR
01H
ADR
01H
CMD 10H CMD
1 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’
Check sum
ASCII mode:
LRC (Longitudinal Redundancy Check) is calculated by summing up, module 256, and 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,
01H+03H+21H+02H+00H+02H=29H, the 2’s-complement negation of 29H is
D7
H.
RTU mode:
CRC (Cyclical Redundancy Check) is calculated by the following steps:
Step 1:
Load a 16-bit register (called CRC register) with FFFFH.
Step 2:
Exclusive OR the first 8-bit byte of the command message with the low order byte of the 16-bit CRC
register, putting the result in the CRC register.
Step 3:
Examine the LSB of CRC register.
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