4 DATA COMMUNICATION USING BIDIRECTIONAL PROTOCOL
4.1 Receiving Data from Target Device
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4
Receive data arrangement
The following shows the example of the arrangement of data received from the target device when it is stored in the receive
area.
• The received message is stored to the C24 buffer memory (Receive data storage area).
• The data is stored in the receive data storage area in the order of the data reception from low address, (L) (H), to next
address, (L) (H).
When received data "ABCDEFG123" was stored (for the CH1 side)
When the data length unit is in bytes, 00H is stored in the higher byte of the last data storage position in the receive area when
the data length of the message is an odd byte.
ABCDEFG1 23
LH LH
5
B
D
F
1
3
A
C
E
G
2
ENQ
05
H
00
H
41
H
42
H
43
H
44
H
45
H
46
H
47
H
31
H
32
H
33
H
77
H
02
H
ACK
06
H
(00
H
) (05
H
)
(42
H
) (41
H
)
(44
H
) (43
H
)
(46
H
) (45
H
)
(31
H
) (47
H
)
(33
H
) (32
H
)
C24
Reception area
(buffer memory)
Received data
Receive data count
Sum
check
code
Data
length
(0005H)
Received data
Transmitted data (Response message)
Target device
(Normal completion)
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