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Communication operation and settings
● Sum check code
The sum check code is 2-digit ASCII (hexadecimal) representing the lower 1 byte (8 bits)
of the sum (binary) derived from the checked ASCII data.
Fig. 6-111: Sum check code (examples)
When Pr. 123 "Waiting time setting" ≠ 9999, create the communication request data without
"waiting time" in the data format. The number of characters decreases by 1.
6 - 210
Example 1
Station
ENQ
number
Computer
→ Inverter
0
H05
H30
ASCII Code
Example 2
Station
STX
number
Inverter
→ Computer
0
ASCII-Code
H02
H30
Instruction
code
1
1
1
0
E
H31
H45
H31
H31
H30
H
H
H
H
H
H
30 + 31 + 45 + 31 + 31 + 30 + 37 + 41 + 44
H
= F 4
Data read
1
1
7
7
0
H31
H31
H37
H37
H30
H
H
H
H
H
H
30 + 31 + 31 + 37 + 37 + 30
H
= 30
Parameter
Sum
Data
check
code
7
4
A
D
F
H37
H41
H44
H46
H34
H
H
H
Binary
code
Sum
ETX
check
code
3
0
H03
H33
H30
Binary
code
I000039C
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