SimCom SIM900 Operation User's Manual page 5

B) POWERING SIM900/900
Step 1: P Put the jump per between
Step 2: C Connect one e end of the s
end at c omputers se erial port.
Step 3: I Insert a valid d SIM card in
Step 4: : : Apply the 9 9V~12V DC vo
Step 5: N Now press th he Power ON
Step 6: N Now press o nboard Swit
switch O OR apply the pulse shown
5Sec>T
HIGH
LOW
NOTE: A After power O ON the netw
once the e sim900/90 0A modem i
64ms ON N Time/3000 0ms OFF Tim
All manuals and user guides at all-guides.com
0A modem in n Manual M
ST & MAN P PINS.
serial Cable a at the DB9 se
the onboard d SIMCARD h
oltage sourc e at DC‐IN ja
N switch to tu urn on the b
ch (S/W) and d keep it pre
n below at E XT‐EN pin.
TON>1
TOFF>=
work LED will blink at the
s registered to the netw
me.
Mode:
erial connect tor of the mo odem and an
holder.
ack of SM900 0/900A mod em.
oard.
essed for at le east 1 sec an nd then relea
1.7 Sec
rate of 64ms s ON time/8 800ms OFF T
ork the netw work LED will l blink at the
nother
ase the
ime and
e rate of