Mitsubishi MELSEC LJ71C24, User Manual

Page: 204 / 428

11 - 18 11 - 18
11 DATA COMMUNICATION USING THE BIDIRECTIONAL PROTOCOL
(2) Transmission data arrangement
The following example shows an arrangement of the transmission data to be sent
to the external device when storing it in the transmission area.
(Example) When "ABCDEFG123" is sent:
H L
02
H
77
H
33
H
32
H
31
H
47
H
46
H
45
H
44
H
43
H
42
H
41
H
00
H
05
H
3 2 1 G F E D C B A
H L
ENQ
Sum
check
code
5
(00
H
) (05
H
)
B
(42
H
)
D
(44
H
)
F
(46
H
)
1
(31
H
)
3
(33
H
)
A
(41
H
)
C
(43
H
)
E
(45
H
)
G
(47
H
)
2
(32
H
)
Transmission
data count
designation
Transmission
data designation
Transmission area
(buffer memory)
C24
External device
Receive data (response message)
ACK
06
H
(Normal completion)
(0005
H
)
Data
length
Transmission data