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any key
after
the X command is issued and
before
0 N L I NE 0 R I G I NATE is
displayed on the
screen.
This will
shut
down the dialer and return the message
DISCONNECT
.
Busy Number Redial Interruption
While the modem is in the 60-second timer delay
(before
making another attempt to
redial a number found busy), you can interrupt the process by using the
0 0
wake-
up
sequence.
The wake-up command forces the modem into the command receptive
state
and aborts the busy redial mode
.
Aborting
On-Line Modes
There are four
conditions
which will abort an on-line
status
while you are in
communications
over
the telephone lines.
1. Loss of carrier
2. Loss of Data Terminal Ready
(DTR)
3. Reception of a Long Space
4. Transmission of the Abort Character
Condition 1 - Loss of Carrier
The carrier is the
sound
you hear if you pick up the receiver while the DC-2212 is in
communications with another modem. If
you
are
operating at
low
speed
(less than 1200
baud), the carrier
sounds
like
a steady,
pure tone. You will be
able
to hear a
change
in
the pitch of the tone if
you
type on the keyboard. During high speed operations (1200
baud), the carrier
sounds
like running
water,
or
static.
Regardless of the speed
of
operation
,
the tone
(or
noise) is the carrier signal
.
When the
carrier signal
is detected
,
the CD indicator lights on the front panel. If the carrier is
interrupted longer than 300
milliseconds,
the modem will begin the disconnect
sequence.
The message DISCONNECT is displayed on
your screen
and the modem
goes
into the
off-line state.
A "loss of
carrier"
disconnect
can
result other than from being turned off by one of
the modems. If you drop the receiver back onto the telephone
cradle,
or shout into the
handset,
the noise
generated
may be
strong enough
to MASK the carrier
so
that the
DC-2212 thinks
canier
is turned
off.
Although the low
speed carrier
is less
susceptible
to noise than the high speed
carrier,
there is
always
the possibility of data errors
.
19
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