Mitsubishi Electric FR-A520-0.4K Instruction Manual page 144

7) 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.
(Example1)
Computer→Inverter
ASCII code→
When Pr. 123 "waiting time setting" ≠ 9999, create the communication request data with no "waiting time" in the data format.
The number of characters is decreased by 1.)
(Example2)
Inverter→Computer
ASCII code→
8) Error code
If any error is found in the data received by the inverter, its definition is sent back to the computer together
with the NAK code. (Refer to page 139.)
Station
Instruction
ENQ
number
code
0 1 E 1 1
H05 H30 H31 H45 H31 H31 H30 H37 H41 H44 H46 H34
↓
H H H H H H H
30 + 31 + 45 + 31 + 31 + 30 + 37 + 41 + 44
H
=1F4
Sum
Station
STX Read data
number
0 1 1 7 7
H02 H30 H31 H31 H37 H37 H30 H03 H33 H30
↓
H H H H H H
30 + 31 + 31 + 37 + 37 + 30
H
=130
Sum
135
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PARAMETERS
Sum check
Data
code
←Binary code
0 7 A D F 4
H H
Sum check
ETX
code
←Binary code
0 3 0
4