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Optional Modem Configurations
The DC-2212 modem has four internal
configuration options. These options
must be
performed by a qualified Radio Shack
service
technician.
• Multi-line phone operation
• RS-232 protocol extension
• Synchronous mode operation
Option 1. Multi-line Phone Operation
This option
allows the
DC-2212 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!
Option 2. RS-232 Protocol Extension
There are two RS-232-C lines that may be
enabled
to
supply your
computer
with
further
information
.
These
are
RI
and
HS lines.
The DC-2212
has
the option
of
signaling
the RS-232
cable that
the
telephone
is
ringing.
The RI pin
on
the RS-232 cable will toggle
at
the
ringing rate anytime
the modem is
connected to a
ringing line. The
HS
pin
on the
RS-232 may
be enabled
to
supply
the
terminal
(computer)
with high
speed indication
if the modem
sw
itches to 1200 baud
mode upon
on-line condition.
Option 3. Synchronous Mode Operation
This option
allows you
to
communicate
in
synchronous
mode
.
In thi
s
mode
,
all
automatic features are
disabled
and only
manual
operation
is
allowed
.
A
jumper is used
to determine if
you will
be required to
use
INT
CLOCKing.
39
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