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Optional
modem
configurations
Jj
The
DCM
212
Modem
has
two
internal
configuration
options.
These
options
must
be performed by a
qualified
Radio Shack
service tech-
nician.
•
Multi-line
phone
operation
•
RS-232
protocol extension
Multi-line
phone
operation
This option
allows the
DCM
212
Modem
to
be used with
multi-line
telephones. Internal
circuitry
can be
configured to
signal
a
local
network
that there
is
a
MODEM
on
the
line
instead
of
a
telephone.
Unless
the
Modem
is
modified
internally,
the
local
network
will start
flashing the
BUSY
indicator
on
the multi-line
telephone
when
the
Modem
seizes
the
line!
RS-232C
protocol extension
There
are
2
RS-232C
lines
that
can be enabled
to
supply your
com-
puter with
more
information.
These
are
the
RI and
HS
lines.
The
DCM
212 has
the
option of
signaling the
RS-232C
cable that the
telephone
is
ringing.
The
RI
pin (No.
22)
on
the
RS-232C
cable
will
toggle
at
the ringing
rate
any
time
the
Modem
is
connected
to
a
ring-
ing
line.
The
HS
pin (No.
12)
on
the
RS-232 can be
enabled
to
supply
the terminal
(computer) with high speed
indication
if
the
Modem
switches to
1200
bps
upon
an
ON-LINE
condition.
81
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