Data Communication and Host Modes
Rev 3.0B Feb.08
52
SLIP
SLIP
mode
is
entered
be
using
the
“
AT\ASLIP
”
command.
As
in
PPP
Mode,
the
IP
address
that
the
host
assumes
is
affected
by
the
setting
of
*HOSTPRIVMODE.
SLIP
does
not
negotiate
the
IP
address
with
the
connected
device
or
computer,
so
before
making
a
SLIP
connection,
the
SLIP
driver
on
that
device
or
computer
must
be
configured
to
use
the
IP
address
specified
by
querying
S110
.
UDP and UDP Pad
When
the
modem
is
in
UDP
PAD
(Packet
Assembly
and
Disas
‐
sembly)
Mode,
all
characters
received
on
the
serial
port
are
assembled
into
UDP
packets
and
sent
to
the
remote
IP
address/port
or
the
Raven,
and
any
packets
received
from
the
same
IP/port
‐
destined
for
the
device
port
of
Raven
(see
*DPORT)
‐‐
are
disassembled
and
dumped
onto
the
serial
line.
A
UDP
session
is
initiated
by
one
of
the
following
events:
•
Using
the
Dial
UDP
(DP)
AT
command
(example,
ATDP192.168.3.23/3456).
•
Setting
the
Startup
Mode
Default
(MD)
to
3
(UDP)
so
that
a
UDP
session
is
entered
automatically
when
the
modem
registers
onto
the
network.
Serial
data
will
be
sent
to
the
IP/port
specified
in
S53.
Incoming
UDP
packets
will
be
processed
out
the
serial
port
if
•
UDP
auto
answer
is
enabled
(S82=2);
•
The
destination
IP
address
matches
that
in
S53
(if
Friends
Mode
is
enabled,
the
IP
address
also
needs
to
be
present
on
the
Friends
List);
•
Or
allow
any
IP
is
set
(AIP=1);
•
The
modem
is
in
AT
mode
(not
in
a
current
UDP
or
TCP
session).
UDP
packet
assembly
is
affected
by
the
values
of
S50
(PAD
Forwarding
Time
‐
out)
and
S51
(PAD
Forwarding
Character).
Data
received
in
the
serial
buffer
will
be
transmitted
when
the
idle
inter
‐
character
time
‐
out
specified
in
S50
(in
tenths
of
seconds)
occurs
or
when
a
character
is
received
that
matches
S51
(if
non
‐
zero).
UDP Auto Answer
UDP
auto
answer
(previously
called
UDP
half
‐
open)
is
set
with
S82=2.
When
set,
the
Raven
will
automatically
establish
a
UDP
session
to
the
source
IP
address
and
port
of
the
UDP
packet
received.
The
Raven
will
remain
“locked”
to
this
one
