Command Codes - Tandy DCM212 Operation Manual

Hayes
protocol
mode
operation
3
In
Hayes
protocol
mode,
commands
instruct
the
DCM
212's operation
and
register
values determine
how
the
commands
will
be
executed.
The
command
structure
is
patterned
from
the industry standard AT-string
command
interface,
thus
making
the
DCM
212 Hayes-software
com-
patible.
Command
codes
All
command
lines
in
Hayes
protocol
mode
begin with the
AT
(atten-
tion code)
string
and end
with a
carriage return
(
(
ENTER
)
).
AT
must
be
entered
in uppercase
letters,
but
the
commands
following
can be
entered
in either upper- or
lowercase.
When
the
AT
command
is
received,
the
Modem
will automatically
set
the operation speed and
parity.
You
can
store
a
sequence of
commands
in
the
command
buffer
memory,
provided
the
command
line
does not exceed
the 40-character buffer
capacity.
These commands,
however,
must be
entered
in
a
"logical"
order to be
executed.
If
the
command
line
exceeds the buffer-character
limit,
the
Modem
will
not
execute the
commands
and
instead sends
the
ERROR
result
code
(Table
8).
Example:
AT
V1
S6=3
DP9,
T{111)555-1234; [ENTER]
Now,
to
review the
commands,
one by
one:
AT
Beginning
of
command
line.
Places
the
Modem
in
command
recep-
tive
mode.
V1 Display the verbal
result
code. (Refer
to
Result
codes
later in this
section.)
S6=3
Wait 3 seconds
for
the
dial
tone (see Table
7,
Registers).
DP9,
Dial
9
with pulse
dialing,
then
pause
for
2 seconds
(default
value
of
register S8).
29