Mitsubishi Electric MELSEC iQ-R Series - Page 39

4 MESSAGES OF SERIAL COMMUNICATION MODULE
4.3 Details of Setting Data
37
4
Sum check range
The sum check range of each message format is as follows:
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)
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)
Format Message structure Reference
Format 1 to format 3 Page 29 Format 1
Page 30 Format 2
Page 31 Format 3
Format 4 Page 32 Format 4
Format 5 Page 33 Format 5
Control code Sum check code
Sum check range
CR
0D H
LF
0A H
Control code
Control code Sum check code
Sum check range
DLE
10 H
ETX
03 H
Control code
Control code Sum check code
Sum check range
05 H 30 H 30 H 46 H 46 H 42 H 52 H 33 H 4D H 30 H 30 H 30 H 30 H 43 H 30 H
00FFBR M000 C003
E
N
Q
Station
No.
PC No.
Command
Message
wait
Character
area
Sum
check
code
Sum check range
10 H 02 H 12 H 00 H F8 H 05 H 07 H 03 H 04 H 00 H 01 H 00 H 01 H 04 H 01 H 00 H 40 H 00 H 00 H 9C H 05 H 00 H 10 H 03 H 30 H 35 H
LHLH LHLH − L
L
H
H
LH
D
L
E
S
T
X
D
L
E
E
T
X
Subcommand
Number of data bytes
Frame ID No.
Station No.
PC No.
Network
No.
Request destination module I/O No.
Request destination module Station No.
Self-station No.
Command
Head device
Device code
Number of device points
Sum check Code
Sum check range (excluding additional codes)