L
.*
F--
c
10.
COMMUNICATIONS
IN
THE
.
BIDIRECTIONAL
.
._
_/.
_..
MODE
MELSEGA
10.3.2
To
wrtte
data
to
8
specla1 applicstlons
area
In
Mer
memory
(1)
Buffer memory is not battery backed up
by
a battery
When the power is turned ON, the
PC CPU
is reset, or the mode
is
switched, all data in the buffer memory is set to the default values.
Therefore, any data changed from the default values must be written
whenever the power is turned
ON,
the
PC CPU
is reset,
or
the mode is
switched.
(2)
Except for mode switching areas, only a
TO
instruction can be used to
write data to the special applications area
(1
OOH
to
11
FH).
(3)
If data is written using the command in a computer program, the
AJ71C24
will
not to operate correctly. Never
try
to write data using a
computer program.
If
the following functions are used in combination with the dedicated
protocol, allocate the user area
in
buffer memory
so
that the same area
will not
be
used by different functions.
If
the same area is allocated to different functions, the data in this area
is rewritten and communications will not be correctly executed.
0
Bidirectional mode send
0
Bidirectional mode receive
0
Buffer memory read/write
(CR/CW
command) function
0
On-demand function
The memory areas preceding and following the special applications
area cannot be allocated as a single area. The areas of
OH
to
FFH
and
120H
to
7FFH
must be recognized as independent areas.
Example:
-
11FH
12on
/
I
(4)
If
designation is made to process the sendheceive data in the bidirec-
tional mode
in
units of words or bytes, the on-demand data with
the
dedicated protocol is processed in the same designated unit.
(5)
Do
not write
'1'
(request to clear) to the bidirectional received data clear
request area (address
10DH).
If
'1'
is written,
all
received data may be cleared, and data communica-
tions might not be correctly executed.
P
10-9
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