9.
Network
Indicator
LED:
Network
Status
Indicator
LED.
State
SIM900
function
Off
SIM900
is
not
running
64ms
On/
800ms
Off
SIM900
does
not
find
the
network
64ms
On/
3000ms
Off
SIM900
find
the
network
64ms
On/
300ms
Off
GPRS
communication
10.
ADC
and
PWM
Pins:
ADC
and
PWM
Pins
of
SIM900A.(Refer
page
9,10
for
ADC
and
PWM
commands)
11.
Audio
Interface:
Audio
Pins
(Speaker
and
microphone
pins)
of
SIM900/900A.
12.
SIM
Interface:
SIM
Card
holder
Interface.
13.
Vout:
Regulated
4.2V
output
voltage
for
external
application
circuit.
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