M10 Hardware Design
GSM network and the software protocol stack is closed. Thus the parts of AT commands related
with SIM card and Protocol stack will not be accessible, and the others can be used as well as in
normal mode.
Use the “AT+QALARM” command to set the alarm time. The RTC remains the alarm time if the
module is power down by “AT+QPOWD=1” or by PWRKEY pin. Once the alarm time is expired
and executed, the module will go into the alarm mode. In this case, the module will send out an
Unsolicited Result Code (URC) when set as fixed baud rate:
ALARM RING
RDY
This result code does not appear when autobauding is active.
During alarm mode, use “AT+CFUN” command to query the status of software protocol stack; it
will return 0 which indicates that the protocol stack is closed. Then after 90s, the module will
power 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 alarm
mode, 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 mode
AT command
Function
AT+QALARM
Set alarm time
AT+CCLK
Set data and time of RTC
AT+QPOWD Power
down
AT+CFUN
Start or close the protocol stack
3.4.2 Turn off
Following procedure can be used to turn off the module:
z
Normal power down procedure: Turn off module using the PWRKEY pin
z
Normal power down procedure: Turn off module using AT command
z
Over-voltage or under-voltage automatic shutdown: Take effect if over-voltage or
under-voltage is detected
3.4.2.1 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. The
power down scenario illustrates as following figure.
M10_HD_V1.00
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