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91	91	== 1.3  Specification ==
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93	93	=== 1.3.1  Rated environmental conditions ===
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95	95	[[image:image-20220610154839-1.png]]
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97		-(((
98		-**Remarks: (1) a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing);  b. When the ambient temperature is 40-50 ℃, the highest humidity is the highest humidity in the natural world at the current temperature (no condensation)**
99		-)))
	98	+**Remarks: (1) a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing);**
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	100	+**b. When the ambient temperature is 40-50 ℃, the highest humidity is the highest humidity in the natural world at the current temperature (no condensation)**
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103	103	=== 1.3.2  Effective measurement range Reference beam pattern ===
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105	105	**(1) The tested object is a white cylindrical tube made of PVC, with a height of 100cm and a diameter of 7.5cm.**
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269	269	* If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor.
270	270	* If the sensor value lower than 0x0118 (280mm), the sensor value will be invalid. Since v1.1.4, all value lower than 280mm will be set to 0x0014(20mm) which means the value is invalid.
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	273	+
272	272	=== 2.3.3  Interrupt Pin ===
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274	274	This data field shows if this packet is generated by interrupt or not. [[Click here>>||anchor="H3.3A0SetInterruptMode"]] for the hardware and software set up.
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838	838	* Solid ON for 5 seconds once device successful Join the network.
839	839	* Blink once when device transmit a packet.
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841	841	== 2.8  ​Firmware Change Log ==
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1041	1041	* Example 2: Downlink Payload: 06000003 ~/~/ Set the interrupt mode to rising edge trigger
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1044	1044	= 4.  FAQ =
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1046	1046	== 4.1  What is the frequency plan for LDDS75? ==
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1101	1101	* (% style="color:red" %)**8 **(%%)**:** 8500mAh battery
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1104	1104	= 7. ​ Packing Info =
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1116	1116	* Weight / pcs : g
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1119	1119	= 8.  ​Support =
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1121	1121	* Support is provided Monday to Friday, from 09:00 to 18:00 GMT+8. Due to different timezones we cannot offer live support. However, your questions will be answered as soon as possible in the before-mentioned schedule.