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Tandy
protocol
mode
operation
Each number
dialed
is
flashed
on
your
screen
in
the
sequence
and
speed
specified.
See
Programming
commands
in
Appendix
A
for
fast
and
slow
signaling
rates.
3.
When
the
carrier
tone
is
heard, the
Modem
sends the message:
CONNECT
When
the
DCM
212 reaches the
end
of
its
programmed
dialer
memory,
another
carriage return/line feed
is
issued
and
the
Modem's
line
status
circuitry
checks the
progress
of
the
call
made.
The
types
of
line
conditions detectable
by
the
Modem
are discussed
in
the section
Line
status conditions.
Line
status
conditions
After a
number
has been
successfully dialed,
one
of
three
status
con-
ditions
results:
ring
back,
busy
signal,
or
re-order
signal.
Line
condition
1
—
ring
back
When
the
Modem
hears the
phone
ring,
the
message
RINGING
...
is
displayed.
Each
ring cycle detected
by
the
Modem
is
counted
until
the ringing
stops.
The
Modem
stops
counting
when
the
telephone
receiver
is
picked
up
or
if
it
has
been
programmed
(using the
/
com-
mand)
to
abort
a
call
that
is
not
answered
on
a designated
number
of
rings.
When
the ringing
stops,
the
Modem
checks
for
carrier.
When
it
detects
the
carrier,
it
outputs the
message
CONNECT.
As
soon
as the
carrier
tone
is
received
from
the
called
modem,
you can
begin
communica-
tions.
You
are
now
in
the
ON-LINE
mode.
Line
condition
2
—
busy
signal
When
a busy
signal
is
detected,
the
message
BUSY
appears
on
your
display.
The
Modem
disconnects
from
the telephone
lines
and
returns
to
the
OFF-LINE
waiting
state until
it
receives
the
wake-up
command.
22
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