9.
COMMUNICATIONS
IN
THE NO-PROTOCOL
MODE
..,.
,
MELSEGA
1
,
.
9.8
Sendlng Data
In
the No-Protocol Mode
(AJ71C24
-.
External Device)
In
this section, "sending" means outputting data which is
in
the no-protocol
mode AJ71C24 send area to an external device receive area. This
is
in
response to turning the PC CPU send request signal (Y(n+l)O)
ON.
(1) Send area and writing send data
).
.
f-
c
,..
c
e-
P-
-*.
C.
P-
r
The send data length and send data are written to the send area.
(a) The length of send data to be written (or having been written) to the
send data storage area is written to the no-protocol send data
length storage area in either words or bytes.
(b) The data to
be
transmitted is written to the send data storage area.
When the send request signal (Y(n+l)O) is turned
ON
after (a) and
(b) have been executed,
the
AJ71C24 transmits the set length of
set data from the send data storage area in the order of address
number.
By
default, buffer memory area
OH
to
7FH
is allocated to the
AJ71 C24 send area.
It
is
however possible to change the send area allocation. (See
Section 7.4.4.)
The unit word/byte
of
send data
Addresa
(-4
Buffer
memory
r-----
length depends on the setting
(address
103H).
Use the
TO
instruction to set the
to
length of data to be transmitted.
7FH
Data to be transmitted is stored
sequentially from the lowest ad-
dress.
9-
15
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