A
.-
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.-
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-._...
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...
,
,.,,
..1,
_.
,
..
.
.
-
-
3.
SPECIFICATIONS
1.
"
I
'i'
.
7
'8
'.
'i
-
MELSEC-A
(d) DSR signal
0
During DTR/DSR control, when this signal is OFF, data is not
0
If DTR/DSR control is not executed, the DSR signal status will be
0
When the external device can receive data, make sure that this
transmitted from the AJ71 C24 to an external device.
ignored.
signal is
ON.
(e) CD signal
The AJ71C24 operates according to the setting of the CD terminal
check.
\
I
CD Tormlnal Chock Enablod
Full-
duplex
The
AJ71
C24
pefforms tranrmiesion
processing when the
CD
signal
transmirsion soquome
of the
(receivs carrier detection) is
ON.
The
AJ7lC24
is initialized when the
CD
signal
is
turned
OFF
during dda com-
munications in the dedicated protocol.
I
CD
Tormlnal
Chock Dkabkd
The
A171
C24
performs transmission
processing regardless
of the
ON/OFF stat.
of
the
CD
signal. (This
enables data communications with
those external devices which cannot
control (ON/OFF) the
CD
signal.)
Setting impossible
(f)
DTR signal
The AJ71C24 system controls the DTR signal as follows:
The AJ71C24 system turns ON the DTR signal when communica-
tions is enabled if the dedicated protocol or bidirectional mode is
currently used.
When DTR/DSR control is executed, the AJ71C24 system turns
ON/OFF the DTR signal according to the size of available area of
the receive data storage
OS
area during communications
in
the
no-protocol mode. (The DTR signal turns
ON
when the data com-
munications
of
the AJ71 C24 is enabled.)
Section 3.5.2 gives for the ON/OFF timing of the
DTR
signal.
Since the received data is stored
in
the
OS
area when the DTR
signal is OFF, read the received data using the sequence program
(See Section
9);
This signal is ON during DTR/DSR control.
(2)
ON/OFF definitions are as follows:
ON
:
5V to 15 VDC
OFF
:
-5
V
to -15 VDC
(3) Interface connector
The following type of RS-232C connector is used. Use a matching
connector.
25-pin D-sub (female) screw-fixing type
3-4
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