GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 29 / 80
3.5. Power Saving
Based on system requirements, there are several actions to drive the module to enter low current
consumption status. 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 be not 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 be not 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 SLEEP mode.
When the module is set by the command with AT+QSCLK=1, you can control the module to enter 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 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.
To Next Page
Loading...
Need help?
General
