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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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129	129	* Sewer
130	130	* Bottom water level monitoring
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132		-
133		-
134		-
135	135	== 1.6  Pin mapping and power on ==
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272	272	* If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor.
273	273	* 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	+
275	275	=== 2.3.3  Interrupt Pin ===
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277	277	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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841	841	* Solid ON for 5 seconds once device successful Join the network.
842	842	* Blink once when device transmit a packet.
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844	844	== 2.8  ​Firmware Change Log ==
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1044	1044	* Example 2: Downlink Payload: 06000003 ~/~/ Set the interrupt mode to rising edge trigger
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1047	1047	= 4.  FAQ =
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1049	1049	== 4.1  What is the frequency plan for LDDS75? ==
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1104	1104	* (% style="color:red" %)**8 **(%%)**:** 8500mAh battery
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1107	1107	= 7. ​ Packing Info =
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1119	1119	* Weight / pcs : g
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1122	1122	= 8.  ​Support =
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1124	1124	* 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.