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458	458	== 2.7  Distance alarm function ==
459	459
460	460
461		-NDS03A can monitor the timeout for a status change, this feature can be used to monitor some events such as door opening too long etc. Related Parameters are:
	461	+(% style="color:blue" %)**AT Command: AT+ALARM1=min,max**
462	462
	463	+**Example 1:**
463	463
464		-(% style="color:blue" %)**1. Keep Status: Status to be monitor**
	465	+AT+ ALARM1 =60,200  ~/~/ Alarm when moisture lower than 60.
465	465
466		-Keep Status = 1: Monitor Close to Open event
	467	+AT+ ALARM2 =min,max
467	467
468		-Keep Status = 0: Monitor Open to Close event
469	469
	470	+**Example 2:**
470	470
471		-(% style="color:blue" %)**2. Keep Time: Timeout to send an Alarm**
	472	+AT+ ALARM2 =200,1500  ~/~/ Alarm when temperature lower than 1500
472	472
473		-Range 0 ~~ 65535(0xFFFF) seconds.
474	474
475		-If keep time = 0, Disable Alarm Base on Timeout feature.
476		-
477		-If keep time > 0, device will monitor the keep status event and send an alarm when status doesn't change after timeout.
478		-
479		-
480		-(% style="color:blue" %)**AT Command to configure:**
481		-
482		-(% style="color:blue" %)**PB14 PIN:**
483		-
484		-(% style="color:#037691" %)**AT+TTRIG=1,30** (%%) **~-~->**  When the **Keep Status** change from connected to disconnect, and device remains in disconnect status for more than 30 seconds. NDS03A will send an uplink packet, the [[Alarm bit>>url:http://wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/CPL01%20LoRaWAN%20Outdoor%20PulseContact%20%20Sensor%20Manual/#H2.3.3Real-TimeOpen2FCloseStatus2CUplinkFPORT3D2]] (the second bit of 1^^st^^ byte of payload) on this uplink packet is set to 1.
485		-
486		-(% style="color:#037691" %)**AT+TTRIG=0,0 ** (%%) **~-~->** Default Value, disable timeout Alarm.
487		-
488		-
489		-(% style="color:blue" %)**PB15 PIN:**
490		-
491		-(% style="color:#037691" %)**AT+TTRIG2=1,30**
492		-
493		-(% style="color:#037691" %)**AT+TTRIG2=0,0 **
494		-
495		-
496	496	== 2.8  Set debug mode ==
497	497
498	498