Mitsubishi Electric FR-F740 EC Instruction Manual page 423

Parameter
● 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. 6-160: Sum check code (examples)
When Pr. 123, Pr. 337 "Waiting time setting" ≠ 9999, create the communication request data
without "waiting time" in the data format. (The number of characters decreases by 1.)
FR-F700 EC
Example 1
Station
ENQ
Computer
number
→ Inverter
0
H05 H30
ASCII-Code
Example 2
Station
Inverter
ENQ
number
→ Computer
0
ASCII-Code H02 H30
Communication operation and setting
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
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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