7.
INITIAL
SETTING
OF
TRANSMISSION CONTROL DATA TO
BUFFER
MEMORY
,-
.
.
MELSEGA
7.1
Setting RS-232C CD Terminrl Check Enrble/Dirrble
Setting this RS-232C CD terminal check function to enable or disable deter-
mines whether or not the AJ71 C24 checks the ONlOFF status of the CD signal
(receive carrier detection signal).
Disabling the RS-232C CD terminal check function.
If a "1" is written to buffer memory address 1
OBH,
the
AJ71 C24 does not check
the ON/OFF status
of
the CD signal. It operates as
if
the CD signal were
ON.
Setting Method
1OB:- bl
bO
Default:
0
WOOrl
0
signal
status
checked
(Pre8mt)
1:
signal
status
not
dleckd
(Absent)
IPOINT~
1
I
I
I
Set bits bl to b15
of
address lOBH to either
0
or
1.
(The AJ71 C24 will ignore the settings.)
~____
PHow
to disabie the RS-232C CD terminal check function (AJ71 C24
1/0
addresses
80
to
9F).
I
(Sequence
Program)
Write
-1'
to
buffer address
memory
1 OBH.
When the RS-232C is set to use halfduplex transmission (see Section 7.2),
set the CD terminal check to "Enabled". Section 4.5.2 explains the con-
necting procedure.
If
the CD terminal check is set to "Disabled", the transmission method is
automatically set to fullduplex transmission.
7-2
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