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9.
COMMUNICATIONS IN THE NO-PROTOCOL MODE
MELSEC-A
(3)
Data receive procedure
3eading data by the read completed codel
I
Completed code
(Default: CR LF (ODOAH)
I1
bee
if changed)
:ompuler
;
;
L , H ! L , H ~
,
! L , H
AJ71 C24
Reed rsqusrt signal X n l is turned ON
when read complete sods
1%
received
(Received data read
request)
(Received data read
completed)
y ( n + t ) l
3eading data by the set data length
(
Set
data length
AJ71 C24
Read request slgnal Xnt is turned
ON when the set length of data has
been
received.
(Received data read
request)
(Received data read
completed)
(4)
Data receive program examples
Example 1 : By receiving completed code, in word units (buffer memory allocation: default]
T o store "AJ71C24[
1"
CR, LF, received from an external device, to D O to D5 of PC CPU.
:AJ71C24
I10
addresses: IAO to
IBF)
Computer
AJ
1
71
1
c 2 ; 4 [ ]
;
CL
10 bytes
I2
=5words
AJ71 C24
Received data read request
p r \
Receive data
length is stored
Received data read completed YIBI
PC CPU (program)
(
PC CPU program example)
j2yiG7 (l)K
MOVP
DO
K1
AJ71C24 buffer memory
Sequence program
data memory
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