3.
SPECIFICATIONS
MELSEC-A
POINT1
When using a DCl/DC3 code to control data receive or DC2/DC4 code to
control data receive,
the
AJ71 C24 will execute the corresponding DC code
control if the user’s data (received from the external device) contains a
DC code.
However, if the user’s data (whose request to send was transmitted by a
PC CPU) contains a DC code, that data will be transmitted.
(6)
Handling DTR/DSR signals when DTR/DSR controls are not used
When DTR/DSR controls are not used, the AJ71C24 handles DTR/DSR
signals as follows:
(a) DTR signal is normally
ON.
(b) The DSR signal
ON/OFF
state
is
ignored.
(7) Transmission control when the AJ71C24 mode number is
9
to D
When the AJ71 C24 RS-232C and RS-422 are set to the same mode,
the
AJ71 C24 controls data communications as shown below:
(mode number
9:
no-protocol mode, modes
A
to D: dedicated protocol
(formats 1 to 4))
(a) When DTR/DSR controls are executed
Whenthe
Rs23x
m
used
as
the
main channel:
WhemtheR5422isused
(LI
the
main channel:
PCCPU
AJ7lC24
PC
CPU
Aril-4
The
+
mark indicates controlling sendlreceive
data
marked
by
**.
(b) When DCl/DC3 transmission control is executed
WhentheRS232Cisused
a8
the
main channel:
Whenthe
RS4p
b
used
a8
the
main channel:
The
+
mark indicates controlling
receive
data marked by
**.
3-26
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