GSM/GPRS Module Series
M35 User Manual
M35_User_Manual Confidential / Released 30 / 85
Before the completion of the power down procedure, the module sends out the result code shown below:
NORMAL POWER DOWN
1. This result code does not appear when autobauding is active and DTE and DCE are not correctly
synchronized after start-up. The module is recommended to set a fixed baud rate.
2. As logout network time is related to the local mobile network, it is recommended to delay about 12
seconds before disconnecting the power supply or restarting the module.
3. For more details about the application of STATUS pin, please refer to the Chapter 3.13.
After that moment, no further AT commands can be executed. Then the module enters the power down
mode, only the RTC is still active.
3.4.2.2. Power Down Module Using 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 to 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 as shown below:
NORMAL POWER DOWN
After that moment, no further AT commands can be executed. And then the module enters the power
down mode, only the RTC is still active.
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
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