(2) AJ71C24 is set to
I'
non-priority
'I.
,
,:.tin, data send.
-
h
Data
External device
B
Data
I
\
Yh
I
I
1~~71
c24
I
c-
SD (send d8ta)
RS
(send request)
CS
(cloar
to
send)
-
CD (receive carrier
dotrot)
RD (received data)
nonprbrily
',
tnnm(-
Resend
th.
co
li(lml
I",,.,,
Section 5.4.2 gives
Interruptod when
J
ON.
Data
C-1
contents of the send.
Data C-2
/
~
(1
1
AJ71C24 stores received
The following steps describe the operations required for an external device at
every timing mentioned by
(1)
to
(6)
in the above figure.
The signal name
Is
the signal of the AJ71C24.
As described in
(l),
turn ON/OFF the CD signal of the AJ71C24 with the
external device and do data transmission to the AJ7l C24.
(Note that
5)
and
6)
are different in the non-priority setting.)
1) When not transmitting data from the external device to the
AJ71C24, turn the CD signal OFF.
2)
When doing a data send, check the
RS
signal.
If
the
RS
signal is
OFF,
turn the CD signal ON.
If the
RS
signal Is ON, wait until
it
turns OFF. After the
RS
is turned
OFF, turn the CD signal ON.
3)
After turning the CD signal ON, transmit data.
4) After completing the data send, turn OFF the CD signal.
5)
Even
if
the
RS
signal turns ON during data transmission, continue
the data send to the AJ71C24. (This occurs when the AJ7lC24
and the external device start data transmission simultaneously.)
6)
After the send from the external device is completed, transmit data
from
the
AJ71 C24 to the external device.
Section 5.4.2 gives details.
When DTWDSR control is being executed.
When
(a)
starting
or
during data transmission to the AJ71C24, and
(b)
if the DTR(ER) signal of
AJ71C24 turns
OFF,
interrupt data transmission until the DTR signal turns
ON.
See Section 3.5.2.
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