10.
COMMUNICATIONS IN THE BIDIRECTIONAL
MODE
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MELSEC-A
10.9
Transmitting Data
In
the Bidirectional
Mode
(AJ71C24
+
Computer)
Transmitting means outputting data which was written
to
the bidirec-
tional mode send buffer memory area (hereafter referred to as the send
area), from the AJ71C24 to a computer in response to turning
ON
the
PC
CPU
send request signal C/(n+l)O).
(1) Send area and writing send data
The send data length and send data are written to the send area.
(a) The length
of
data to be written (having been written) to the bidirec-
tional 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 designated
length of designated data from the send data storage area sequen-
tially from the lower address.
By default, the buffer memory area
OH
to
7FH
is allocated to the
send area.
This area may be changed as needed. Section 7.4.4 gives the
procedure for changing the send area addresses.
The unit
of
rend data length
depends on the setting at address
103H
of
the wordlbyte setting area.
Send data length storage area
Designate the length
of
data
to
be
sont with the TO in*truction.
Designated
valuo
ir transmitted as
the data length.
Send data storage area
Send data is transmitted requentially
from the lowert address.
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