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Hayes
protocol
reference
S16
Self-test
toggle
Apply
value
1
to
S16
when
you want
to
set
the
Modem
to
self-test
mode.
The
self-test
mode
forces
the
Modem
to "talk to
itself!'
Using
this
fea-
ture,
you
will
be
able to
tell if
the
Modem
is
functioning
correctly.
When
the
Modem
is
in
self-test
mode,
the
internal
switches are
select-
ed such
that
data transmitted
from
the
computer
is
looped
back
to
the
receiver
and
processed
just as
if
it
were
in
communications
over
the telephone
lines.
Keys
entered
from
the
computer
are
echoed
to the
screen.
Before
executing
a
self-test,
be
sure to
disconnect the
wall
jack
phone
line
cord
from
the wall jack.
To
set
the
Modem
for
self-test
in originate
mode,
type:
AT
S16=1
D [ENTER]
Self-test
mode
ON.
.
Originate
mode.
To
set
the
Modem
for
self-test
in
answer mode,
type:
AT
S16=1
A (ENTER)
Seif-test
mode
ON.
Answer mode.
Bit-mapped
registers
S13,
S14
and
S15
are
the
bit-mapped
registers.
The
register bits
are de-
fined in tables
14-16.
Bit-mapped
registers,
which
provide
some
useful information,
may
be
accessed
through your
own
program. However,
do
not use
these
registers
to control the
DCM
212.
Writing
to
bit-mapped
registers
may
produce
unpredicable
results.
70
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