SimCom SIM900 Operation User's Manual page 2

PI INOUT:
1. DC IN Jack: D DC Input PIN
2. Power Enab ble Switch: T
board. Whe n pressed tu
3. Power Indic cator LED: M
4. EXT‐EN: Exte ernal enable
circuit.
5. S/W: Onboa ard switch to
6. Power ON s election jum
Automatic)
7. RI LED and B Buzzer: Incom
State R I Response
Standb by H igh
Voice C Call Th he PIN is cha
ch hanged to Hi
1. .Establish th
2. .Hang up the
Data ca all Th he PIN is cha
ch hanged to Hi
1. .Establish th
2. .Hang up the
SMS Th his PIN chan
ch hanged to HI
URC Th his PIN chan
it is changed t
8. Buzzer Enab ble Jumper: J
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N for GSM M ODEM.
his is Power enable switc
urns ON the b board and w
odem powe r indicator L
es pin to turn n ON or OFF S
o turn ON or r OFF SIM900
mper: To sele ect the powe
ming messag ge and call in
anged to Low w. when any
igh
e call
e call
anged to Low w. when any
igh
e call
e call
ged to LOW and kept LO
IGH.
ged to LOW and kept LO
to HIGH.
Jumper to en nable or disa
ch to Turn O N or turn OF FF power to t
hen released d turns OFF t the board
ED.
SIM900A mo odule with ex xternal contr
0A module m manually.
er ON mode o of the SIM90 00A (Manual
ndicator LED and buzzer.
of the follow wing events o occurs the PI
of the follow wing events o occurs the PI
OW for 120m s when SMS is received a
OW for 120m s when URC is reported
able onboard d buzzer.
the
rolling
or
IN will
IN will
and then
and then