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Chapter
5
speaker
off
all
of
the time or the
M2
command
entered
to
send
all
signals,
including the Carrier
Signal,
to
the speaker.
Note
that
the
M2
command
can
be used
as
a
form
of
trouble-
shooting.
If
unanticipated
call
terminations
occur
frequently, enter
M2
and
listen
to
the Carrier
signal.
If
it
changes tone
or
stops,
the
modem
will
drop
the connection. In
this
case,
the
phone
lines
are
faulty
or the
modem
at
the other
end
is
malfunctioning.
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Example:
AT M<CR>
This
command
is
used
to
turn
off
the
speaker
so that
no
signals
are sent
to
the speaker.
Notice
that
no
parameter
is
entered
so
that
is
assumed.
5.9
-
Return
to
On-line
State/Initiate
or
Exit
RDL
Default
Parameter
Parameter
Command
Value
Range
Description
O
OO
0-2
0=Return
to
on
line
state.
1-Exit
RDL
and
return
on-line
.
2=Initiate
RDL
and
return on-line.
This
command
is
generally
used
to
return to the
On-Line
State
after
an Escape
Code
(+++) has
been
entered
to exit
to
the
Com-
mand
State, as in
the following
example.
5-1
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