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Getting to Know Your Modem
Tandy's DC-2212 high
speed
,
intelligent
modem has
all the features needed
to
enhance
your
data-communications
applications -
including
a
data
output rate four
times
faster
than that of the
standard "dumb"
modem.
This direct-connect,
212-A type
modem is not
only designed with standard automatic
dial,
answer
,
and
disconnect features, but
a
wide
range of system configuration
enhancements as
well.
After
dialing is
completed, the
DC-2212 modem monitors the
call
and
reports its progress to
your computer over
the
serial
RS-232-C
link. These
functions
,
which are roughly equivalent
to the
functions of an operator
making
a
call,
include:
• Waiting
while the
phone rings until the dialed number
answers
• Hanging up
and redialing
later
if
the number is busy,
or
if the
call
has not been
answered
after
a specified
length
of time
• Hanging up the handset
at
the
end of a completed call
Each
call-progress signal -
ring
-back,
no
tone, busy tone
,
or dial tone -
that the
modem detects is printed out
as a serial status
message
on your display. An auto-
disconnect
feature
permits the modem to disconnect
if a carrier signal
is not maintained
after
a
data
call
has been
set
up
or
upon
command
.
This
feature
is useful in preventing
the tie-up
of expensive computer facilities
due to wrong-number
calls
,
failure
of
the
distant party to disconnect from
a
time-sharing
system, or
line
failures.
All functions
of
the DC-2212 modem
are controlled
by
ASCII (American National
Standard Code for Information Interchange) encoded
commands
that
you
program from
your
computer keyboard
over
the
serial
RS-232-C
interface
.
For example, you
can
control the
selection of
pulse-
or
tone-dialing through the
dialer programming
mode
command,
or
the number
of
times the phone
is
to ring before being
answered
by using
the
advanced
programming
enable command.
3
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