Quectel Wireless Solutions GSM/GPRS Module : User Manual : Page 32

GSM/GPRS Module Series

GC10 Hardware Design

GC10_Hardware_Design Confidential / Released 31 / 76

3.5. Power Saving Technology

Based on system requirements, there are several actions to drive the module to enter into low current

consumption state. For example, “AT+CFUN” can be used to set module into minimum functionality mode

and DTR hardware interface signal can be used to lead system to sleep mode.

3.5.1. Minimum Functionality Mode

Minimum functionality mode reduces the functionality of the module to a minimum level. The consumption

of the current can be minimized when the slow clocking mode is activated at the same time. The mode is

set with the “AT+CFUN” command which provides the choice of the functionality levels <fun>=0,1,4.

 0: Minimum functionality.

 1: Full functionality (default).

 4: Disable both transmitting and receiving of RF part.

If the module is set to minimum functionality by “AT+CFUN=0”, the RF function and SIM card function

would be disabled. In this case, the UART port is still accessible, but all AT commands related with RF

function or SIM card function will not be available.

If the module has been set by the command with “AT+CFUN=4”, the RF function will be disabled, but the

UART port is still active. In this case, all AT commands related with RF function will not be available.

After the module is set by “AT+CFUN=0” or “AT+CFUN=4”, it can return to full functionality by

“AT+CFUN=1”.

For detailed information about “AT+CFUN”, please refer to the document [1].

3.5.2. Sleep Mode

The sleep mode is disabled by default. You can enable it by “AT+QSCLK=1”. On the other hand, the

default setting is “AT+QSCLK=0” and in this mode, the module cannot enter into sleep mode.

When the module is set by the command “AT+QSCLK=1”, you can control the module to enter into or exit

from the sleep mode through pin DTR. When DTR is set to high level, and there is no on-air or hardware

interrupt such as GPIO interrupt or data on UART port, the module will enter into sleep mode

automatically. In this mode, the module can still receive voice, SMS or GPRS paging from network, but

the UART port does not work.