M10 Hardware DesignGSM network and the software protocol stack is closed. Thus the parts of AT commands relatedwith SIM card and Protocol stack will not be accessible, and the others can be used as well as innormal mode.Use the “AT+QALARM” command to set the alarm time. The RTC remains the alarm time if themodule is power down by “AT+QPOWD=1” or by PWRKEY pin. Once the alarm time is expiredand executed, the module will go into the alarm mode. In this case, the module will send out anUnsolicited Result Code (URC) when set as fixed baud rate:ALARM RINGRDYThis result code does not appear when autobauding is active.During alarm mode, use “AT+CFUN” command to query the status of software protocol stack; itwill return 0 which indicates that the protocol stack is closed. Then after 90s, the module willpower down automatically. However, during alarm mode, if the software protocol is started by“AT+CFUN=1” command, the process of automatic power down will not be available. In alarmmode, driving the PWRKEY to a low level voltage for a period will cause module to power down(Please refer to the power down chapter).The table follow briefly summarizes the AT commands that are used usually during alarm mode,for details of the instructions refer to document [1]:Table 7: AT commands used in alarm modeAT command FunctionAT+QALARM Set alarm timeAT+CCLK Set data and time of RTCAT+QPOWD Power downAT+CFUN Start or close the protocol stack3.4.2 Turn offFollowing procedure can be used to turn off the module:z Normal power down procedure: Turn off module using the PWRKEY pinz Normal power down procedure: Turn off module using AT commandz Over-voltage or under-voltage automatic shutdown: Take effect if over-voltage orunder-voltage is detected3.4.2.1 Turn off module using the PWRKEY pin (Power down)You can turn off the module by driving the PWRKEY to a low level voltage for some time. Thepower down scenario illustrates as following figure.M10_HD_V1.00 - 26 -Quectel