User guide

M80 EVB User Guide
M80_EVB_UGD_V1.2 - 35 -
6. Insert earphone or handset into audio interface.
For Power On operation, please refer to chapter5.1.
7. After waiting for 2~3 seconds, customer should first input “AT” or “at” string once or more
until receiving “OK” from the module in the HyperTerminal. The module is set to
autobauding mode in default configuration. This operation is to synchronize the baud rate
between the computer and the module.
8. Input AT command and the module will execute its corresponding function.
Customer can refer to document [1] for the details of AT commands. For instance, when inputting
“ATD112;” an emergency call is established.
5.4.2. Auxiliary UART
Quectel module provides two UART ports for achieving Dual UART.
“AT+QEAUART=1” which is sent via main UART is used to enable Auxiliary UART. Please
restart the module after executing the command. For more details, please refer to document [1].
5.5. Firmware upgrade
1. Insert the plug of the 5V power adapter.
2. Connect PC and EVB (Main UART) correctly with USB to UART cable.
3. Start the Firmware Upgrade Tool in the PC and choose right COM port.
4. Press the START button in the Firmware Upgrade Tool.
5. Switch the S4 and S1 in the EVB to ON state
After these steps, the firmware refreshing process will be proceeding. For more details, please
refer to document [4].
5.6. Charging
The battery can be charged in both ghost mode and charging mode. About the difference between
them, you can refer to the document [7].
5.6.1. Ghost mode
1. Connect the battery to the battery contact pin.
2. Insert the plug of the 5V power adapter.
3. Switch S1 to OFF state, Switch S2 to ON state, Switch S3 to OFF state, and Switch S4 to
OFF state.
4. Monitor the VBAT voltage and charging state via “AT+CBC”.
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