User's Manual

SIM900B EVB User Guide
SIM900B-EVB_UGD_V1.01 18 14.04.2010
6. Illustration:
6.1 Running:
(1) Connect the SIM900B module to the 60pins connector on SIM900B EVB, inserting 5V
direct current source adapter, switching the S1 switch on off state, S2 switch on ON
state;
(2) Press the PWRKEY for about 1 second, and then SIM900B module begins running.
You can see the light on the EVB flashing at a certain frequency. By the state, you can judge
whether the EVB and SIM900B can run or not. No function and test can be executed when
we have not connected necessary accessories.
6.2 Connecting Net and calling
(1) connect the serial port line to the MAIN serial port, open the HyperTerminal(AT
command windows) on your Personal computer, the location of the HyperTerminal in
windows2000 is START→accessory→communication→HyperTerminal. Set correct
Baud Rate and COM number. The Baud Rate of SIM900B is 115200, and the COM
number based on which USB port your serial port line insert in, you should select such
as COM3 or COM4 etc.
(2) Connect the antenna to the SIM900B module using an antenna transmit line, insert SIM
card into the SIM card interface, insert headphones or headset into its interface.
(3) Act on the step of
running which mentioned above, power on the system, typing the
AT command in the HyperTerminal, and then the SIM900B module will execute its
corresponding function.
6.3 Downloading
Connect the serial port line to the debug port, connect the direct current source adapter, run the
download program and press the START key, then switch the S1 switch on ON state, S2 switch
on ON state, then EVB provide the function of downloading.
6.4 Turns off
Turn off SIM900B module: press the PWRKEY for about 1 second, SIM900B module will be
turned off.