User Manual

GSM/GPRS Module Series
GC10 Hardware Design
GC10_Hardware_Design Confidential / Released 28 / 76
3.4.2.2. Power Down Module by AT Command
It is also a safe way to turn off the module via AT command “AT+QPOWD=1”. This command will let the
module log off from the network and allow the firmware to save important data before completely
disconnecting the power supply.
Before the completion of the power down procedure, the module sends the result code, shown as below:
NORMAL POWER DOWN
Please refer to the document [1] for details about the AT command “AT+QPOWD”.
3.4.2.3. Over-voltage or Under-voltage Automatic Shutdown
The module will constantly monitor the voltage applied on the VBAT, if the voltage is≤3.5V, the following
URC will be presented:
UNDER_VOLTAGE WARNING
If the voltage is≥4.5V, the following URC will be presented:
OVER_VOLTAGE WARNING
The normal input voltage range is from 3.3V to 4.6V. If the voltage is >4.6V or <3.3V, the module would
automatically shut down itself.
If the voltage is <3.3V, the following URC will be presented:
UNDER_VOLTAGE POWER DOWN
If the voltage is >4.6V, the following URC will be presented:
OVER_VOLTAGE POWER DOWN
When autobauding is active and DTE&DCE are not correctly synchronized after start-up, this result code
will not appear. It is recommended to set a fixed baud rate for the module.
NOTE