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Chapter 3
Registers
Registers are
used
to
store
the
parameters
which
control
communica-
tions.
Each
register
has
variables that
determine
how
the
Modem
operates or supplies
information
on
the
Modem's
current condition.
The
DCM
212's
17
registers
and
the default values are
shown
in
Table
7.
Register
SO
defines the
number
of
ringing
signals
before
a
call
is
an-
swered,
register
SI
counts the
rings, registers
S2-S5
define the func-
tion
key
characters,
registers
S6-S12
are
used
to control
function
time,
and
register
S16
is
for the
self-test.
S13-S15
are
the
bit-mapped
registers.
With
the exception
of
the
last
3 bit
registers,
you
can
read the
current
value
of a
register
or assign a
new
value
to
match
the
registers
to
your
particular
environment
by
using the
command
syntax.
Command
syntax
Sx?
Check
the
register
value
Use
this
syntax to check
register
values.
The
value of each
register
is
displayed
on
the screen in
decimal
numbers
in
the range
to 255.
For
example,
to
check
the value
of
register
SO, type:
AT SO?
(ENTER)
On
the
screen,
you
will
see
—
000
OK
You
can
also
check
the values
of
plural
registers
in the
same
command
line.
To
check the
values
of
register
SO and
register
S7, type:
AT
SO?
S7?
(
ENTER
)
33
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