819
‐
1XRT
Serial
Cellular
Data
Modem
8
Figure
1:
819
‐
1XRT
HyperTerminal
Port
Settings
4.
Confirm
contact
with
the
modem
with
AT+GSN.
This
prints
out
the
ESN
of
the
modem
i.e.
(+GSN:
45262036).
If
you
get
an
Error
or
no
communication
message,
verify
the
modem
is
connected
to
the
proper
COM
port
and
powered
on.
See
Figure
2.
5.
Verify
good
signal
strength
with
AT+CSQ?
.
A
typical
reply
is
+CSQ?
19,99.
Signal
strength
ranges
from
0
to
31,
the
higher
the
number
the
stronger
the
signal.
6.
Confirm
your
registration
on
the
cellular
network
with
AT+CSS?
.
A
reply
of
+CSS?
2,Z,99999
indicates
you
are
not
registered.
It
may
take
up
to
15
seconds
after
power
‐
up
to
register
on
the
network.
Once
registered,
a
typical
response
is
+CSS?:
1,A,4152
where
1
is
the
band
class,
1=800
MHz,
2=1900
MHz,
A
‐
F
is
the
band
(Z
indicates
you
are
not
registered
on
network),
4152
is
the
SID,
i.e.
the
cell
tower
ID,
(99999
indicates
you
are
not
registered
on
network).
7.
Confirm
the
phone
number
currently
in
the
modem
with
AT$KWDIR?
.
It
should
be
10
digits
(i.e.
0000005555)
prior
to
activation.
8.
Perform
the
activation
instructions
specific
to
your
carrier
as
indicated
in
Appendix
1:
Subscriber
Activation,
(i.e.,
for
Verizon,
OTASP
can
be
initiated
with
an
AT
command
of
AT+CDV*22899
).
Wait
2
minutes.
9.
After
the
unit
has
been
activated,
verify
programming
success
with
AT$KWDIR?
.
It
should
now
display
your
assigned
number.