L
10.
COMMUNICATIONS
IN
THE
BIDIRECTIONAL
MODE
MELSEC-A
10.3
Programming Hints
10.3.1
System
configuratkm and communications
mode
for
bidirectional
mode
communications
(1)
System configuration and the
AJ71C24
mode setting
Data communications
in
the bidirectional mode is possible only
in
the
system where a computer and the
AJ71C24
are linked
in
a
1
:
1
ratio.
The mode setting switch
in
the
AJ71C24
should be set
in
any position
of
'1'
to
'8',
or
the mode switching function can be used to set
the
mode
number from
'1'
to
'8'
(see Sections
3.4
and
7.6.2).
c
'k
-
rr
(2)
Usable
with
dedicated protocols
When data communications is executed
in
the bidirectional mode, data
communications using the dedicated protocol is possible with the other
interface.
Data communications using the bidirectional mode and the no-protocol
mode at the same time is not possible.
Computer -P*
C0mPut.r
Computer
g
Q
F
RS-232C
communications
RS4p-d
-c--
inthe~mocb
w#ldedicrdsdpalocds
with
dedicated protocols inthebdhdodmode
Fs4p--
..
..
t
CPU
3
3=
dub
modub
CPU
+
5
I
I
AI71
C24
AI71
C24
c
Y
.--
'.
d.
1
n
10-8
1
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