Tandy 1400 LT User Manual page 21

Testing
Your
Modem
The
modem
responds:
OK
This
resets register
S16 and
frees
the
modem
for
normal
opera-
tions.
8)
Remember
to
plug the
phone
cable
back
in
before
making
a
call.
If
there
is
a problem:
1)
Is
the
modem
firmly seated
in
the expansion
slot?
2)
Double check
that
you have
disconnected
the
phone
line.
3.2
Remote
Digital
Loopback
RDL
is
an advanced
test
feature
which
allows
one
modem
to re-
quest the
remote
modem
to
"loopback"
data sent
to
it.
The
RDL
feature allows
you
to
make
a
complete unattended
test
of
the
re-
mote
modem.
Your
local
modem
sends the data over the
phone
lines
to
the remote
modem. The
remote
modem
will
then
loop-
back
whatever
is
sent,
and
you
should
see
your
test
message
ap-
pear
on
your screen
exactly as
you
sent
it.
This
test
must be performed when
the
modems
are
on
line.
To
begin the
test,
you must
enter the
command
mode,
using the
+++
escape code.
Once
on
line
and
in
command
mode, you
can
tell
the
modem
to
begin the
test.
1)
In
command
mode,
enter:
AT02<CR>
3-3