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Modem
Registers
must remain
active after dialing
before
it
is
recognized
as
valid.
In
other words, noise
from
the
phone
line
(voices
and
interference)
can
occasionally
have
the
same
frequency
as
the
carrier
signal.
To
safeguard
against misinterpretation of
noise as
carrier,
the value
of
S9
sets
a
time
window
during
which
the
signal
must
sustain
the
proper
carrier
frequency.
It is
highly unlikely that
any
noise
can
sustain
the
frequency
asso-
ciated with
the
carrier signal for
600
milliseconds,
the
default
value.
Increasing
this
value further decreases the
likelihood.
We
recommend
against
changing
this
value
to a shorter period,
how-
ever.
Note
that
the value
in register
S9
is
a
value expressed
in
1/10
seconds.
For
instance,
a value of
6.0
=
,6
seconds or 600
milliseconds
10.0
=
1.0
second
or
1000
milliseconds
24.0
=
2.4
seconds
or
2400
milliseconds
Also note
that the value of
S9 has
no
effect
upon
the
time be-
tween
when
loss
of
carrier
occurs
and
when
the
modem
goes
on
hook
(hangs up).
The
value
in
the
S10
register
determines
this
time
window.
6.13
Register
S10
-
Carrier
Loss
to
Disconnect Delay
Time
To
Display
Modem
To Change
Status,
Enter:
Displays:
Status,
Enter:
AT
S10?
<CR>
007
ATS10=n<CR>
(700 msec.)
(n-1-255)
6-9
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