POWERI
A)
Step
1:
Step
2:
another
Step
3
:
I
Step
4:
A
Step
5:
N
ING
SIM900/
POWERING
Put
the
jum
Connect
one
end
at
comp
Insert
a
valid
Apply
the
9V
Now
press
th
/900A
MOD
SIM900/900
per
between
e
end
of
the
puters
serial
d
SIM
card
in
V~12V
DC
vo
he
Power
‐
ON
DEM:
0A
Modem
i
n
ST
&
AUT
P
serial
Cable
port.
the
onboard
ltage
source
N
switch
to
t
n
Automatic
PINS.
at
the
DB9
s
d
SIMCARD
h
at
DC
‐
IN
jac
urn
on
the
b
c
Mode:
serial
connec
holder.
ck
of
SM900A
board.
ctor
of
the
m
A
modem.
modem
and
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