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Introduction
to
Modem
Operation
Chapter
4
INTRODUCTION TO
MODEM
OPERATION
4.0
Direct Entry
into
the
1200
BPS
Internal
Modem Command
Mode
This chapter
describes the functional
states
of
the
1200 bps
inter-
nal
modem
and
the
guidelines to follow
when
sending
commands
to
it.
The
responses
which
the
modem
sends
to
your
commands
are
also
described.
For
those
who
want
to
use the
modem's commands
directly,
ac-
cess
the
modem
through your
communications
software.
Then
en-
ter
the
command
AT
Z<CR>
t
which
will
set
the
modem
options
to
their
default values.
4.1
Functional States
The
modem
will
always
be
in
one
of
two
states:
local
command
state
or
on-line
state.
In the
local
command
state,
the
user
is
making
commands
to
the
modem
via
keyboard
or
program
con-
trol.
No
data
is
being
sent or received.
The
local
command
state
is
provided
so that the
modem
can be
commanded
to
perform
vari-
ous
functions,
such
as
changing
configurations
and
dialing.
In
the
on-line
state,
the data
is
sent
and
received over the
phone
lines.
When
on-line, the
modem
will
be
in
the
originate
mode
(when
the
modem
is
making
a
call)
or the
answer
mode
(when
accepting
4-1
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