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GSM Module
AT+ZEDT? +ZEDT:
1
OK
AT+ZEDT =?
+ZEDT: (0,1)
OK
Parameter
<NUM> range: 0
~
1
Remarks
The command “+ZEDT” is mainly used to set the module at low power
consumption mode; under low power consumption mode; the module
could intermittently turn off the RF components, besides, the MCU
、
DSP
、
PLL ,
external clock at digital baseband part can enter dormant mode, and
26MHz main crystal oscillator would enable/disable regularly to reduce the
module’s power consumption.
Whether or not the module can enter low power consumption mode
depends on the following factors: 1) Key (including ON/OFF key) event and
exception/external interruption; 2) whether or not receive valid DTR signal;
3) OTA event (e.g., receive text message, incoming call, etc.)
In order to make the module enter low power consumption mode, please
use the command “AT+ZEDT
?
” to check the module’s current settings after
start-up; if returning with “+ZEDT: 0”, please use the command “AT+ZEDT=1”
to change the settings; If you ever use the ON/OFF jumper cap, remove it.
Disconnect the COM port---including AT port and debugging port. The
module would enter the low power consumption mode after a while (1
~
3
minutes).
The default value of the setting value <NUM> is 0.
Besides, the command “+ZEDT” would effect the status LED. After setting
AT+ZEDT=1, the status LED would not flash. The status LED will restore
normally after changing the settings through the command AT+ZEDT=0 and
restarting the module.
2.9.6
+ZDSLEEP: 32KHz Deep sleep mode
Description
This command is used to enable/disable 32KHz sleep mode.
Format
AT+ZDSLEEP=<mode>
AT+ZDSLEEP=1
Enable sleep mode
Example
AT+ZDSLEEP=0
Disable sleep mode
Parameter
<mode>
0: disable sleep mode
1: enable sleep mode
2.9.7
+CUSD: send USSD data
Description
Send USSD data
(
ASCII code
)
51