262 Macintosh
User's
Handbook
link has been made. The carrier
is
the basis for all telecommun-
ications. In
order
to
relay information, the carrier
is
modu-
lated.
That
is, it
is
altered in some predetermined pattern. In
our
case this modulation
is
via a series
of
tones as described
previously.
The
Auto
Answer light could be lit
for
one
of
two reasons.
Of
course, it will be on when the
modem
is
in
auto
answer
mode.
That
is, the modem will answer the telephone without
any
specific instructions. To
enter
this mode, either set
DIP
switch
number
5
to
the
up
position
or
enter
the
command
AT
SO=
I.
The lamp will also light momentarily when the phone
is
ringing to indicate
an
incoming call.
MacTerminal
The MacTerminal software package enables the Mac
to
utilize a modem
and
communicate with
another
computer. The
name describes its
primary
function. The application
is
designed to
turn
the Mac into a
computer
terminal. At the time
of
this writing, the official version
of
the Mac Terminal applica-
tion had
not
yet been released.
Our
examples are based
upon
a
prerelease version which is very close to the final product. For
this reason, the following discussion may vary slightly from
your experience with the MacTerminal application.
Basically, MacTerminal operates in a
manner
similar
to
other
applications used
on
the Mac. When the application
is
opened, the software will create a document. In the case
of
MacTerminal, the
document
is
a place where information will
appear
as it
is
received from the modem
and,
in most cases, as it
is
entered into the
computer
for
transmission. When
under
the
application, all characters entered
onto
the Mac Terminal doc-
ument will be sent to the modem via the serial communications
port
on
the Mac's back panel.
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