GSM/GPRS/GNSS Module Series
MC60 Series Hardware Design
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3.8.2. Power down GSM Part
The following procedures can be used to turn off the GSM part:
Normal power down procedure: Turn off GSM part using the PWRKEY pin
Normal power down procedure: Turn off GSM part using command
AT+QPOWD
Under-voltage automatic shutdown: Take effect when under-voltage is detected
3.8.2.1. Power down GSM Part Using the PWRKEY Pin
It is a safe way to turn off the GSM part by driving the PWRKEY to a low level voltage for a certain time.
The power down scenario is illustrated as the following figure.
The power down procedure causes the GSM module to log off from the network and allows the firmware
to save important data before completely disconnecting the power supply.
Before the completion of the power down procedure, the GSM module sends out the result code shown
below:
NORMAL POWER DOWN
1. When unsolicited result codes do not appear when autobauding is active and DTE & DCE are not
correctly synchronized after start-up, the GSM module is recommended to be set to 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.
After that moment, no further AT commands can be executed. Then the GSM module enters the power
-down mode.
NOTES
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