Command - Tandy 1400 LT User Manual

Introduction
to
Modem
Operation
There
are
two parameters
shown
in this
example.
The
first
(M2)
indicates that the speaker
will
be on
at
all
times.
The
second
command
(DT)
tells
the
modem
to
dial,
using
touch
tone* the
fol-
lowing
number.
(See the
D
and
M
commands).
Regarding
the
PHONE
NUMBER:
The numbers
in this string
can
be
added together without the parentheses
and
dash.
However,
if
it
is
more
readable
to
use these
delimiters,
the
modem
will
accept
them.
Line
Editing
When
entering
commands
to
the
modem,
editing
can be
done
by
using the
backspace
key,
which
deletes
the
last
character entered,
The
backspace key does
not delete the attention code,
"AT."
Note
that
when
backspacing over a "space," the space
is
ignored
and
the
next character
is
erased regardless of
whether
or
not
it
appears properly
on
the screen.
Null
Parameters
Commands
to
the
modem
consist of a
letter,
such
as
D
for
DIAL,
followed
by
a
number,
or
parameter,
generally
0,
1,
or
2. If
a
command
parameter
is
inadvertently or
intentionally
left
out the
modem
assumes
a
value of
0.
For
instance,
if
a
command
were
entered
"AT
M
DT
(555)
555-llll<CR>,"
it
would be
equivalent
to
"AT
MO
DT
(555)
555-llll<CR>". The
parameter
associated
with the
M
command
would be
instead of 2
as in the previous
example.
The
result
of
this
change would be
to
turn the speaker
off.
4.4
Command
Results
After the
CARRIAGE RETURN
("<CR>"
above) has
been
en-
tered,
the
modem
returns
a
RESULT
CODE
after
every operation.
4-5