D120
Series
DTU
User
Manual
E
‐
Lins
Technology
Co.,
Limited
provide
power
supply
with
our
products,
you
configured
the
Hyper
Terminal
successfully
3.6
Test
command
Test
AT
command
AT<CF>
//Test
“at“command
OK
//Response
ok
parameter
if
successfully
connected,
you
can
make
sure
the
module
have
no
malfunction
AT+CSQ<CF>
//
to
check
the
Signal
quality
+CSQ:
**,
##
//
**
Should
be
the
number
between
10
and
31,
the
signal
quality
becomes
better
as
the
number
grows.
##
should
be
is
99,
Or
you
should
checking
the
equipment
of
antenna
or
SIM
card.
Have
show
detect
Baud
Make
call
