SimCom SIM900 Operation User's Manual page 4

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