c
10.
COMMUNICATIONS IN
THE
BIDIRECTIONAL MODE
MELSEC-A
-
-,
10.
COMMUNICATIONS IN THE BIDIRECTIONAL
MODE
r-
-'
Bidirectional communications with a computer is possible only when a
computer and an
AJ71 C24
are linked in a
1.
:
1
ratio..
Always read this section when the
RS422
and
RS-232C
interfaces are used
with a dedicated protocol and in the bidirectional mode with the mode
setting switch
of
the
AJ71C24
being set to any position from
'1'
to
'8'
or
with
the mode switching function being used to set the mode number to
any of
'1'
to
'8'.
It
is not necessary to read this section when the interfaces are used with
a dedicated protocol and
in
the no-protocol mode.
POINT]
Buffer memory used in the bidirectional mode
In sections other than this, buffer memory used in the bidirectional mode
is described as the buffer memory used for the no-protocol mode. Be-
cause the application purposes are the same, simply think
of
the 'no-
protocol mode' as the 'bidirectional mode'.
Examples:
0
No-protocol mode send area
0
No-protocol send buffer memory head address setting area
-
Bidirectional mode send area
+
Bidirectional send buffer memory head address setting area
10-
1
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