Mitsubishi Electric GOT2000 Series Connection Manual page 76

(8) Sum check code
The sum check code is obtained by converting the lower 1 byte (8 bits) of the result (sum), after having added
the sum check target data as binary data, to 2-digit ASCII code (Hex).
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2. MICROCOMPUTER CONNECTION (SERIAL)
2.5 Message Formats
STX Command Address
R D 0 1 0
02 52 44 30 31 30
H H H H H
(H) (L) (H)
Sum check is performed in this range.
52 + 44 + 30 + 31 + 30 + 30
H H H H H
Sum
Number of
ETX
points
Check
0 0 2 B
30 30 32 03 42
H H H H H H
(L) (H) (L) (H)
+ 30 + 32 + 03 = 1BC
H H H H H
C
43
H
(L)