SimCom SIM900 Operation User's Manual page 8

Now the c connection is s established
NOT TE: A HEX str ring such as "
the b baud rate of f 115200 imm
since e it is used fo or synchroniz
afte er SIM900/90 00A is power
au uto‐baudin g
IF is enabled,
usta art up the ME E, and the "A
com mmand line.
All manuals and user guides at all-guides.com
d and you ca an send the A
"00 49 49 49 9 49 FF FF FF
mediately aft ter SIM900 is
zation with P PC tool. Only
red ON and u unsolicited re
d, the unsolic ited result co
AT" prefix no t "at" prefix
AT‐Comman nds to the GS SM modem
FF" will be s sent out thro ugh serial po
s powered on n. The string g shall be ign
y enter the AT T commands s through ser
esult code "R RDY" is receiv ved from seri
odes "RDY" a and so on are e not indicat
must be set at the begin nning of each
ort at
ored
rial port
ial port.
ted when
h