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19.5 Message Formats
19.5.3 Formats 1, 2 (GOT-A900 series microcomputer connection)
(6) Data
Specifies data to read from/write to the specified device data. (word unit)
Data notated in Hex is converted to a 4-digit ASCII code (Hex) and transmitted from the upper digit.
(7) Error code
This is the response message at faulty communication appended with error contents.
Error code is transmitted in 1 byte.
For details of the error codes generated in format 2 (GOT-A900 series microcomputer connection
(format 2)), refer to the following:
Error code list
(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).
Sum check is performed in this range.
02
H
STX
03
H
ETX
(H) (L)
BC
42
H 43H
Sum
Check
(H) (L)
Command
RD
52
H 44H
(H) (L)
Address
01
30
H 31H
0
30
H
0
30
H
(H) (L)
Number of
points
02
30
H 32H
52H + 44H + 30H + 31H + 30H + 30H + 30H + 32H + 03H = 1BCH
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