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9. COMMUNICATIONS IN THE NO-PROTOCOL MODE
MELSEC-A
(3)
Data receive procedure
leading data by the read completed code/
(Received data read
completed)
Y(n+l)l
I
Completed code
-
(Defeuif: C R LF (ODOAHI
A
s u
X
' " &
(program)
ur"esring
by program
;ompuler
leading data by the set data length1
w v e d data
(1 byte if changed]
8
8
# C L
,
,
-
8
n
F
L , H I L , H
I
,
IL
, n
Set data length
.
.
:omwter
A1 SJ71 C24
Read request signs,
xn,
is turned ON
when
read complete code is received
(Received data read
request1
X . 1
'
l L , H
L , ; H ;
+
Read request signal
Xnl
is turned
41 SJ71 C24
ON when the set length of data has
been received.
(Received data read
re9uesti
(4)
Data receive program examples
xample
1 :
By receiving completed code, in word units (buffer memory allocation: default:
'o store "AlSJ71C24[]" CR, LF, received from an external device, to DO to D6 of AlSCPU.
41SJ71C24 I/O addresses: 1AO to IBF)
Received data read request
X l A1
Receive
data
Received data read completed Y l B 1
A1 SCPU (program)
A1 SCPU program example
AlSJ71 C24 buffer memoly
Sequence program
data memory
9 - 10
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