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17	17	(((
18	18	The Dragino NMDS200 is a(% style="color:blue" %)** NB-IoT Microwave Radar distance sensor**(%%). It uses (% style="color:blue" %)**24Ghz Microwave**(%%) to detect the distance between sensor and different objects. Compare vs ultrasonic or Lidar measurement method, Microwave Radar is (% style="color:blue" %)**more reliable for condensation / dusty environment**(%%). It can sense correct distance even there is water or thick dust on top of the sensor.
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20	20	The NMDS200 can be applied to scenarios such as horizontal distance measurement, parking management system, object proximity and presence detection, intelligent trash can management system, robot obstacle avoidance, automatic control, sewer, etc.
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22	22	NMDS200 can (% style="color:blue" %)**measure two distances**(%%): the closest object and next object behind the closest one.
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24	24	NMDS200 (% style="color:blue" %)**supports Alarm Feature**(%%), user can set the NMDS200 to uplink data in a short interval when the distance is out of configured range.
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26	26	NarrowBand-Internet of Things (NB-IoT) is a (% style="color:blue" %)**standards-based low power wide area (LPWA) technology**(%%) developed to enable a wide range of new IoT devices and services. NB-IoT significantly improves the power consumption of user devices, system capacity, and spectrum efficiency, especially in deep coverage.
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28	28	NMDS200 (% style="color:blue" %)**supports different uplink**(%%) methods including (% style="color:blue" %)**TCP, MQTT, UDP, and CoAP**(%%) for different application requirements.
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30	30	NMDS200 is powered by (% style="color:blue" %)**8500mAh Li-SOCI2 battery**,(%%) It is designed for long-term use of up to 5 years. (Actually Battery life depends on the use environment, update period & uplink method)
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32	32	To use NMDS200, user needs to check if there is NB-IoT coverage in the field and with the Nb-IoT bands that NMDS200 supports. If local operator support it, user needs to get a** (% style="color:blue" %)NB-IoT SIM card(%%)** from the operator and install into NMDS200 to get NB-IoT network connection.
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50	50	* Micro SIM card slot for NB-IoT SIM
51	51	* 8500mAh Battery for long-term use
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53	53	== 1.3 Radar probe specification ==
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56	56	* Measuring Method: FMCW
57		-* Frequency: 24.000 24.500 GHz
	73	+* Frequency: 24.000 ~~ 24.500 GHz
58	58	* Measurement output power: 6dBm
59		-* Measure range: 0.5 20m
	75	+* Measure range: 0.5 ~~ 20m
60	60	* Accuracy: ±0.1m
61	61	* Resolution: 0.01m
62	62	* Horizontal Angel: 78°
63	63	* Vertical Angel: 23°
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65	65	== 1.4  Storage Temperature ==
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81	81	* Sewer
82	82	* Bottom water level monitoring
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84	84	== 1.6  Specification ==
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98	98	* B20 @H-FDD: 800MHz
99	99	* B28 @H-FDD: 700MHz
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101	101	== 1.7  Installation ==
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104	104	Sensor measure direction and angle is as below. When install the sensor, please make sure the sensor direct to object.
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107		-[[image:image-20221207170748-1.png]] [[image:image-20221207170748-2.png||height="366" width="672"]]
	129	+[[image:image-20221207170748-1.png]]
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	132	+ [[image:image-20221207170748-2.png||height="345" width="634"]]
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111	111	== 1.8  Pin Definitions and Switch ==
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124	124	The diagram below shows the working flow in the default firmware of NMDS200:
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126		-[[image:image-20221021110615-5.png]]
	151	+[[image:image-20221021110615-5.png||height="996" width="492"]]
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128	128
129	129	== 2.2 ​ Configure NMDS200 ==
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186	186	(% style="color:red" %)**Note: the valid AT Commands can be found at:  **(%%)[[**https:~~/~~/www.dropbox.com/sh/351dwor6joz8nwh/AADn1BQaAAxLF_QMyU8NkW47a?dl=0**>>url:https://www.dropbox.com/sh/351dwor6joz8nwh/AADn1BQaAAxLF_QMyU8NkW47a?dl=0]]
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189		-
190	190	=== 2.2.3 Use CoAP protocol to uplink data ===
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298	298	|=(% scope="row" style="width: 60px;" %)**Size(bytes)**|(% style="width:50px" %)**8**|(% style="width:30px" %)**2**|(% style="width:30px" %)**2**|(% style="width:75px" %)**1**|(% style="width:30px" %)**1**|(% style="width:50px" %)**1**|(% style="width:60px" %)**2**|(% style="width:60px" %)**2**
299	299	|=(% style="width: 93px;" %)**Value**|(% style="width:67px" %)[[Device ID>>||anchor="H2.4.1A0A0DeviceID"]]|(% style="width:40px" %)[[Ver>>||anchor="H2.4.2A0VersionInfo"]]|(% style="width:45px" %)[[BAT>>||anchor="H2.4.3A0BatteryInfo"]]|(% style="width:75px" %)[[Signal Strength>>||anchor="H2.4.4A0SignalStrength"]]|(% style="width:54px" %)MOD|(% style="width:62px" %)Exit flag|(% style="width:94px" %) [[Distance 1>>||anchor="H2.4.5A0Distance"]] |(% style="width:93px" %) [[Distance 2>>||anchor="H2.4.5A0Distance"]]
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301		-(% border="1" style="background-color:#ffffcc; color:green; width:350px" %)
	325	+(% border="1" style="background-color:#ffffcc; color:green; width:429px" %)
302	302	|(% style="width:60px" %)**4**|(% style="width:60px" %)**2**|(% style="width:60px" %)**2**|(% style="width:60px" %)**4**|(% style="width:100px" %)(((
303	303	**1-32 group**
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305		-|(% style="width:98px" %)[[Time stamp>>||anchor="H2.4.6A0Timestamp"]]| Distance 1 | Distance  2|(% style="width:67px" %)Time stamp|(% style="width:98px" %)...
	329	+|(% style="width:98px" %)[[Time stamp>>||anchor="H2.4.6A0Timestamp"]]| Distance 1 | Distance  2|(% style="width:67px" %)Time stamp|(% style="width:100px" %)...
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307	307	If we use the MQTT client to subscribe to this MQTT topic, we can see the following information when the NMDS200 uplink data.
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