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3 DATA COMMUNICATION USING NONPROCEDURAL PROTOCOL
3.1 Receiving Data from Target Device
When the data of "G" or later in the reception message shown in the above figure is received normally, the data is stored in the
C24 OS area.
The received data stored in the OS area will be read to the CPU module in the next read operation.
ABCDE FGH
3
STX
D
B
A
E
C
(00
H
)
(03
H
)
(41
H
)
(02
H
)
(43
H
)
(42
H
)
(45
H
)
(44
H
)
(02
H
) (41
H
) (42
H
) (43
H
) (44
H
) (45
H
) (46
H
) (47
H
) (48
H
) (03
H
)
S
T
X
E
T
X
C24
INPUT
n 3
Reception area
(buffer memory)
Reception error occurred data
CPU module
Head data
Receive complete code
Receive data
count
Target device
Reception
abnormal
detection
INPUT
instruction
Received data
Transmitted data
Module READY (X1E)
Reception data read request (X3)
Reception abnormal detection (X4)
INPUT instruction
INPUT instruction completion device
INPUT instruction completion device + 1
(normal completion/abnormal
completion)
1 scan
Receive data count (Un\G1536)
Received data
Received data (from Un\G1537)
ERR LED turns ON
Reception abnormal
detection data
Data reception
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