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SIM800C_Hardware_Design_V1.00 23 2014-10-30
AT+CFUN=4： Flight mode (disable RF function).
Table 7: The current consumption of Minimum Functionality Mode (BS-PA-MFRMS=9)
Current consumption(mA) (sleep mode)
Minimum functionality mode minimizes the current consumption to the lowest level. If SIM800C is set to
minimum functionality by “AT+CFUN=0”, the RF function and SIM card function will be disabled. In this
case, the serial port is still accessible, but all AT commands correlative to RF function and SIM card function
will not be accessible.
For detailed information about AT command “AT+CFUN=<fun>“, please refer to document [1].
4.3.2. Sleep Mode 1 (AT+CSCLK=1)
Customer can control SIM800C module to enter or exit the sleep mode (AT+CSCLK=1) by DTR signal. When
DTR is in high level and without interrupt (on air and hardware such as GPIO interrupt or data in serial port),
SIM800C will enter sleep mode automatically. In this mode, SIM800C can still receive paging or SMS from
network but the serial port is not accessible.
4.3.3. Wake Up SIM800C from Sleep Mode 1
When SIM800C is in sleep mode 1(AT+CSCLK=1), the following methods can wake up the module:
Pull down DTR pin.
The serial port will be active after DTR pin is pulled to low level for about 50ms.
Receive a voice or data call from network.
Receive a SMS from network.
Receive external interrupt.
Note: After module has received incoming call or new SMS, serial port can report URC, but the serial port can
not input AT command. Only after the DTR pin is pulled to low level for 50ms, the serial port can input AT
command.
4.3.4. Sleep Mode 2 (AT+CSCLK=2)
In this mode, SIM800C will continuously monitor the serial port data signal. When there is no data transfer over 5
seconds on the RXD signal and there is no on air and hardware interrupts (such as GPIO interrupt), SIM800C will
enter sleep mode 2 automatically. In this mode, SIM800C can still receive paging or SMS from network.
4.3.5. Wake Up SIM800C from Sleep Mode 2
When SIM800C is in sleep mode 2 (AT+CSCLK=2), the following methods can wake up the module:
Send data to SIM800C via main serial port (the first character will lose).
Receive a voice or data call from network.
Receive a SMS from network.
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