Data Communication and Host Modes
Rev 3.0B Feb.08
52
If
the
serial
port
of
the
Raven
is
in
any
mode
other
than
AT
or
PassThru,
the
AT
command
mode
can
be
re
‐
entered
by:
•
Deactivating
DTR
(if
&D2
or
Ignore
DTR,
S211,
is
not
set).
•
Issuing
the
+++
escape
sequence
(if
Disable
AT
Escape,
DAE,
is
not
set).
•
Resetting
or
Power
cycling
the
modem.
Note: DTR needs to be asserted (S211=1 or &D0) by the host before
PPP Mode, SLIP Mode, UDP PAD Mode, or TCP PAD Mode can be
entered.
AT Mode
Using
a
terminal
connection,
AT
commands
are
used
to
configure
the
modem,
command
it
to
do
something,
or
query
a
setting.
For
a
full
listing
of
the
AT
commands,
refer
to
the
appendix.
AceManager
is
a
graphical
user
interface
for
most
AT
Commands.
•
AT
commands
must
always
be
terminated
by
<CR>
(ASCII
character
0x0D),
a
carriage
return
(pressing
enter
on
the
keyboard).
Some
may
also
include
a
new
line
or
line
feed
<LF>
.
•
If
E=1
(Echo
On),
the
AT
command
(including
the
termi
‐
nating
<carriage
return)
will
be
displayed
(output)
before
any
responses.
•
Two
settings
affect
the
format
of
AT
command
output:
V
(Verbose)
and
Q
(Quiet).
•
If
Q=1
(Quiet
On),
no
result
codes
are
output
whatsoever,
so
there
is
no
response
generated
by
a
(non
query)
command.
•
If
Q=0
(Quiet
Off),
result
codes
are
output.
The
format
of
this
output
is
then
affected
by
the
Verbose
setting.
If
Quiet
mode
is
off,
the
result
code
is
affected
as
follows:
For
V=1
(Verbose
mode),
the
textual
result
code
is
sur
‐
rounded
by
a
carriage
return
and
new
line.
Any
AT
query
response
is
also
surrounded
by
a
carriage
return
and
new
line.
For
V=0
(Terse
mode),
a
numeric
result
code
is
output
with
a
single
trailing
carriage
return
(no
new
line
is
output),
while
any
AT
query
response
is
followed
by
a
carriage
return
and
new
line
(there
is
no
preceding
output).
•
For
example,
possible
output
to
the
AT
command
“AT”
with
carriage
return
(assuming
quiet
mode
is
not
on)
is:
