M20 EVB User Guide
5. Illustration
5.1. Power on operations
(1) Connect the M20 module to the 50-pin connector in the M20 EVB. Put Switch S1 to ON state.
Put Switch S2 to OFF state, and Switch S3 to OFF state. Plug in 5V DC adapter.
The LED L1 in the EVB will be turned on.
(2) Press the PWRKEY button for more than 2 seconds, and the module will begin to run.
The blinking mode of the LED L2 indicates the status of the module.
5.2. Communicate with the module
(1) Connect the UART0 in EVB to PC’s USB port through the USB to UART converter cable.
Open the HyperTerminal (AT command dialog window) on PC. The location of the
HyperTerminal tool in Windows XP is START →Program →Accessory →Communication
→HyperTerminal. Set correct Baud Rate and COM port number. The default Baud Rate of
M20 is 115200, and the COM port number can be checked by the Device Manager on PC.
(2) Connect the antenna to the M20. Insert a SIM card into the SIM card socket. Insert a headset
or a handset into the audio interface.
(3) Power on the module according to 6.1. Type AT command in the HyperTerminal, and then the
module will execute its corresponding function. Customer can refer to Document [1] for AT
commands. For instance, typing “ATD112;” will originate an emergency call.
5.3. Firmware upgrade
Connect the UART0 Port in EVB to PC’s USB port through the USB to UART converter cable.
Run the firmware upgrade tool in PC and press the START key. Switch S3 and S1 to ON state, as
shown in Figure 19. Then the firmware upgrade operation will start. Customer can refer to
Document [4] for detailed steps of using firmware upgrade tools.
M20_EVB_UGD_V1.01 - 24 -
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