,F
.4
c
L-
9.
COMMUNICATIONS IN THE
.
._..
NO-PROTOCOL
MODE
9.5
Receiving Data
In
the No-Protocol Mode
(External
Device
-.
AJ71C24)
MELSEC-A
(1)
Data receive area
Addrerr
(defautt)
to
FFH
The
AJ71 C24
stores the received data length and received data
in
the
data receive area.
With default setting, buffer memory area 80H to FFH is allocated as the
receive area.
This area may be changed as needed. See Section
6.4.5
for the
procedure to change the data receive area.
For example,
if
the data to be received is greater
than
the
AJ71C24
receive area
(127
words
in
default setting), data is received
in
more than
one transmission.
It
is advisable to set as 'data receive area" is larger than "received data
length".
,I
The unit (word/byte) of received data length
-
- -
depends on the setting with the word/byte set-
The actual length of received data is written
the set length of data has been received.
I
ting
area (address
103H).
Buffer
memory
when the receive completed code is received
or
Received data
Received data is stored sequentially from the
lowest address until the completed code is
received or the set length of data has been
received.
(2)
Reading received data
c
L-
P
L1
.-
IC
Y
-
There are
two
ways of making a request to read the received data:
0By receiving the receive completed code (data receive
in
variable
0
By receiving the set length of data (data receive in fixed length).
(a) By receiving the receive completed code (variable length)
length), and
The
AJ71C24
makes a request
to
read the received data to the
sequence program when
it
receives the receive completed code,
predetermined by the user and set to the
AJ71 C24
buffer memory.
The default receive completed code is
CR,
LF (ODOAH), but this may
be changed to any value
in
the range of OOOOH to OOFFH. (For the
procedure to change the read completed code, see Section
7.4.1
.)
9-9
_.
..
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