Mitsubishi Electric MELSEC IQ-R series Reference Manual page 39

Sum check range
The sum check range of each message format is as follows:
Format Message structure
Format 1 to format 3
Control code
Format 4
Control code
Format 5
Control code
Calculation of a sum check code
For sum check code, set the numerical values of the lower 1 byte (8 bits) of the added result (sum) as binary data within the
sum check range.
Calculate sum check code except for the additional code. (Page 35 Additional code (10H))
Ex.
In the following case of 1C frame format 1, the sum check code will be 'C0'.
Formula: 30H + 30H + 46H + 46H + 42H + 52H + 33H + 4DH + 30H + 30H + 30H + 30H = 2C0H
Sum check code: 'C0' (ASCII code 43H, 30H)
E
N
Q
0 0 F F B R
05 30 30 46 46 42 52
H H H H H H H
Sum check range
In the following case of 4C frame format 5, the sum check code will be '05'.
Formula: 12H + 00H + F8H + 05H + 07H + 03H + 04H + 00H + 01H + 00H + 01H + 04H + 01H + 00H + 40H + 00H + 00H +
9CH + 05H + 00H = 205H
Sum check code: '05' (ASCII code 30H, 35H)
D S
L T
E X
L H
10 02 12 00 F8 05
H H H H H H
Sum check range
Sum check range
Sum check range
3 M 0 0 0 0
33 4D 30 30 30 30
H H H H H H
L H
07 03 04 00 01 00
H H H H H H
Sum check range (excluding additional codes)
Sum check code
Control code
Sum check code
CR
0D
H
Control code
Sum check code
DLE ETX
10 03
H H
C 0
43 30
H H
L H L H L − H
01 04 01 00 40 00 00 9C
H H H H H H H H
4 MESSAGES OF SERIAL COMMUNICATION MODULE
Reference
Page 29 Format 1
Page 30 Format 2
Page 31 Format 3
Page 32 Format 4
LF
0A
H
Page 33 Format 5
D E
L T
E X
L
L H H
05 00 10 03 30 35
H H H H H H
4.3 Details of Setting Data
4
37