Serial
Port
Configuration
Page
|
37
DSR:
Sets
the
Data
Set
Ready
to
Always
On,
On
When
Available,
On
When
Connected
or
Always
Off.
The
DSR
parameter
determines
how
the
modem
controls
the
state
of
the
Data
Set
Ready
circuit.
The
default
value
is
Always
Off.
―
Always
On:
DSR
is
always
on.
―
On
When
Available:
DSR
is
on
when
the
RF
signal
present
and
phone
registered
on
network.
―
On
When
Connected:
DSR
is
on
when
connected
to
CDMA.
―
Always
Off:
DSR
is
always
off.
DCD:
The
DCD
parameter
determines
how
the
modem
controls
the
state
of
the
Carrier
Detect
circuit
and
the
amber
DCD
LED
on
the
front
panel.
The
default
value
is
Connect
On.
―
Always
On:
DCD
is
always
on.
―
Connect
On:
DCD
is
on
when
connected
to
a
remote
host.
―
Always
Off:
DCD
is
always
off.
RI:
The
RI
parameter
determines
how
the
modem
controls
the
state
of
the
Ring
Indicator
circuit.
The
default
value
is
Always
Off.
―
Always
On:
RI
is
always
on.
―
Connect
On:
RI
tracks
incoming
ring
pulse.
―
Always
Off:
RI
is
always
off.
8.1.1
EXTERNAL
PAD
SETTINGS
PAD
Mode:
Select
button
to
set
the
PAD
mode
of
the
modem
as
a
Server
or
Client.
―
Server
mode
waits
for
inbound
TCP
connections
from
remote
client
or
UDP
data
being
sent
to
the
external
modem’s
IP
address.
For
example,
server
mode
can
be
used
for
mobile
termination
calls.
When
in
server
mode,
it
is
possible
for
the
connected
serial
device
to
make
an
outbound
TCP
or
UDP
connection
when
an
AT
Command
is
issued
(remote
IP
address:
port
number,
e.g.
ATD*166.23.42.10:5000).
―
Client
mode
keeps
an
always
‐
on
TCP
connection
to
a
remote
server
or
sends
all
UDP
to
the
IP
address
and
port
number
specified.
For
example,
client
mode
can
be
used
for
mobile
origination
calls.
Note:
It
is
possible
to
override
Server
mode
and
make
an
outgoing
client
connection
using
the
RS
‐
232
command
set.
atd*xxx.xxx.xxx.xxx
–
When
in
server
mode,
and
no
connection
is
active,
the
atd*
command
(followed
by
an
IP
address)
can
be
issued
to
initiate
an
outbound
client
connection
to
the
specified
IP
address
and
Outgoing
Port
parameter.
To
hang
‐
up
such
a
connection,
3
‘+’
characters
must
be
inserted
into
the
outgoing
stream
(“+++”).
The
modem
will
return
to
command
mode
once
it
has
seen
the
“+++”
and
respond
with
OK.
The
connection
can
then
be
broken
by
entering
“ath”.
The
modem
will
return
to
server
mode.
Such
a
client
connection
can
be
repeated
again
as
necessary,
as
long
as
each
connection
is
hung
‐
up
before
a
new
one
is
made.
