SimCom SIM900 Operation User's Manual page 7

Now sele ect the COM M port
Now clic ck on the res store default t setting and d click OK
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Hyp
Bau
Dat
Pari
Stop
Flow
perTerminal Setting
ud rate: 9600 0
ta Bits: 8
ity: None
p bits: 1
w Control: N None