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458	458	== 2.7  Distance alarm function ==
459	459
460	460
461		-(% style="color:blue" %)**AT Command: AT+ALARM1=min,max**
	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:
462	462
463		-**Example 1:**
464	464
465		-AT+ ALARM1 =60,200  ~/~/ Alarm when moisture lower than 60.
	464	+(% style="color:blue" %)**1. Keep Status: Status to be monitor**
466	466
467		-AT+ ALARM2 =min,max
	466	+Keep Status = 1: Monitor Close to Open event
468	468
	468	+Keep Status = 0: Monitor Open to Close event
469	469
470		-**Example 2:**
471	471
472		-AT+ ALARM2 =200,1500  ~/~/ Alarm when temperature lower than 1500
	471	+(% style="color:blue" %)**2. Keep Time: Timeout to send an Alarm**
473	473
	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	+
475	475	== 2.8  Set debug mode ==
476	476
477	477