Changes for page DS20L -- LoRaWAN Smart Distance Detector User Manual 01

Last modified by Mengting Qiu on 2023/12/14 11:15

From 77.2 to 77.3 From 79.8 to 79.9

From version 77.3

edited by Xiaoling
on 2023/06/13 14:02

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To version 79.8

edited by Xiaoling
on 2023/06/13 14:51

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@@ -85,69 +85,145 @@
  * Sleep Mode: 5uA @ 3.3v
  * LoRa Transmit Mode: 125mA @ 20dBm, 82mA @ 14dBm
--== 1.4 Rated environmental conditions ==
++== 1.4 Suitable Container & Liquid ==
--(% border="1" cellspacing="5" style="background-color:#f2f2f2; width:500px" %)
--|(% style="background-color:#d9e2f3; color:#0070c0; width:163px" %)**Item**|(% style="background-color:#d9e2f3; color:#0070c0; width:90px" %)(((
--**Minimum value**
--)))|(% style="background-color:#d9e2f3; color:#0070c0; width:70px" %)(((
--**Typical value**
--)))|(% style="background-color:#d9e2f3; color:#0070c0; width:87px" %)(((
--**Maximum value**
--)))|(% style="background-color:#d9e2f3; color:#0070c0; width:40px" %)**Unit**|(% style="background-color:#d9e2f3; color:#0070c0; width:50px" %)**Remarks**
--|(% style="width:174px" %)Storage temperature|(% style="width:86px" %)-25|(% style="width:66px" %)25|(% style="width:90px" %)80|(% style="width:48px" %)℃|(% style="width:203px" %)
--|(% style="width:174px" %)Storage humidity|(% style="width:86px" %) |(% style="width:66px" %)65%|(% style="width:90px" %)90%|(% style="width:48px" %)RH|(% style="width:203px" %)(1)
--|(% style="width:174px" %)Operating temperature|(% style="width:86px" %)-15|(% style="width:66px" %)25|(% style="width:90px" %)60|(% style="width:48px" %)℃|(% style="width:203px" %)
--|(% style="width:174px" %)Working humidity|(% style="width:86px" %)(((
--
++* Solid Wall container such as: steel, iron, glass, ceramics, non-foaming plastics etc.
++* Container shape is regular, and surface is smooth.
++* Container Thickness:
++** Pure metal material.  2~~8mm, best is 3~~5mm
++** Pure non metal material: <10 mm
++* Pure liquid without irregular deposition.(% style="display:none" %)
--
--)))|(% style="width:66px" %)65%|(% style="width:90px" %)80%|(% style="width:48px" %)RH|(% style="width:203px" %)(1)
++== 1.5 Install DDS20-LB ==
++
++
++(% style="color:blue" %)**Step 1**(%%):   Choose the installation point.
++
++DDS20-LB (% style="color:red" %)**MUST**(%%) be installed on the container bottom middle position.
++
++[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDDS20%20-%20LoRaWAN%20Liquid%20Level%20Sensor%20User%20Manual/WebHome/image-20220615091045-3.png?rev=1.1||alt="image-20220615091045-3.png"]]
++
++
  (((
--(% style="color:red" %)**Remarks: (1)  a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing);       **
++(% style="color:blue" %)**Step 2**(%%):   Polish the installation point.
++)))
--(% style="color:red" %)**                       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)**
++(((
++For Metal Surface with paint, it is important to polish the surface, first use crude sand paper to polish the paint level , then use exquisite sand paper to polish the metal level to make it shine & smooth.
++)))
--
++[[image:image-20230613143052-5.png]]
++
++
++No polish needed if the container is shine metal surface without paint or non-metal container.
++
++[[image:image-20230613143125-6.png]]
++
++
++(((
++(% style="color:blue" %)**Step3:   **(%%)Test the installation point.
  )))
--== 1.5 Effective measurement range Reference beam pattern ==
++(((
++Power on DDS20-LB, check if the blue LED is on, If the blue LED is on, means the sensor works. Then put ultrasonic coupling paste on the sensor and put it tightly on the installation point.
++)))
++(((
++It is necessary to put the coupling paste between the sensor and the container, otherwise DDS20-LB won't detect the liquid level.
++)))
--(% style="color:blue" %)**1. The tested object is a white cylindrical tube made of PVC, with a height of 100cm and a diameter of 7.5cm.**
++(((
++After paste the DDS20-LB well, power on DDS20-LB. In the first 30 seconds of booting, device will check the sensors status and BLUE LED will show the status as below. After 30 seconds, BLUE LED will be off to save battery life.
++)))
--[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDDS75%20-%20LoRaWAN%20Distance%20Detection%20Sensor%20User%20Manual/WebHome/1654852253176-749.png?rev=1.1||alt="1654852253176-749.png"]]
++(((
++(% style="color:red" %)**LED Status:**
++)))
--(% style="color:blue" %)**2. The object to be tested is a "corrugated cardboard box" perpendicular to the central axis of 0 °, and the length * width is 60cm * 50cm.**
++* (((
++Onboard LED: When power on device, the onboard LED will fast blink 4 times which means detect the sensor well.
++)))
--[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDDS75%20-%20LoRaWAN%20Distance%20Detection%20Sensor%20User%20Manual/WebHome/1654852175653-550.png?rev=1.1||alt="1654852175653-550.png"]]
++* (((
++(% style="color:blue" %)**BLUE LED**(% style="color:red" %)** always ON**(%%): Sensor is power on but doesn't detect liquid. There is problem in installation point.
++)))
++* (((
++(% style="color:blue" %)**BLUE LED**(% style="color:red" %)** slowly blinking**(%%): Sensor detects Liquid Level, The installation point is good.
++)))
++(((
++LDDS20 will enter into low power mode at 30 seconds after system reset or power on, Blue LED will be off after that.
++)))
++
++(((
++(% style="color:red" %)**Note 2:**
++)))
++
++(((
++(% style="color:red" %)**Ultrasonic coupling paste** (%%) is subjected in most shipping way. So the default package doesn't include it and user needs to purchase locally.
++)))
++
++
++(((
++(% style="color:blue" %)**Step4:   **(%%)Install use Epoxy ab glue.
++)))
++
++(((
++Prepare Eproxy AB glue.
++)))
++
++(((
++Put Eproxy AB glue in the sensor and press it hard on the container installation point.
++)))
++
++(((
++Reset DDS20-LB and see if the BLUE LED is slowly blinking.
++)))
++
++[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDDS20%20-%20LoRaWAN%20Liquid%20Level%20Sensor%20User%20Manual/WebHome/image-20220615091045-8.png?width=341&height=203&rev=1.1||alt="image-20220615091045-8.png"]]      [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDDS20%20-%20LoRaWAN%20Liquid%20Level%20Sensor%20User%20Manual/WebHome/image-20220615091045-9.png?width=284&height=200&rev=1.1||alt="image-20220615091045-9.png"]]
++
++
++(((
++(% style="color:red" %)**Note 1:(%%) (% style="color:blue" %)Eproxy AB glue**(%%) needs 3~~ 5 minutes to stable attached. we can use other glue material to keep it in the position.
++)))
++
++(((
++(% style="color:red" %)**Note 2:(%%) (% style="color:blue" %)Eproxy AB glue**(%%) is subjected in most shipping way. So the default package doesn't include it and user needs to purchase locally.
++)))
++
++
  == 1.6 Applications ==
--* Horizontal distance measurement
--* Liquid level measurement
--* Parking management system
--* Object proximity and presence detection
--* Intelligent trash can management system
--* Robot obstacle avoidance
--* Automatic control
--* Sewer
--* Bottom water level monitoring
++* Smart liquid control solution.
--== 1.7 Sleep mode and working mode ==
++* Smart liquefied gas solution.
++
++== 1.7 Precautions ==
++
++
++* At room temperature, containers of different materials, such as steel, glass, iron, ceramics, non-foamed plastics and other dense materials, have different detection blind areas and detection limit heights.
++
++* For containers of the same material at room temperature, the detection blind zone and detection limit height are also different for the thickness of the container.
++
++* When the detected liquid level exceeds the effective detection value of the sensor, and the liquid level of the liquid to be measured shakes or tilts, the detected liquid height is unstable.(% style="display:none" %)
++
++
++== 1.8 Sleep mode and working mode ==
++
++
  (% style="color:blue" %)**Deep Sleep Mode: **(%%)Sensor doesn't have any LoRaWAN activate. This mode is used for storage and shipping to save battery life.
  (% style="color:blue" %)**Working Mode:** (%%)In this mode, Sensor will work as LoRaWAN Sensor to Join LoRaWAN network and send out sensor data to server. Between each sampling/tx/rx periodically, sensor will be in IDLE mode), in IDLE mode, sensor has the same power consumption as Deep Sleep mode.
--== 1.8 Button & LEDs ==
++== 1.9 Button & LEDs ==
  [[image:Main.User Manual for LoRaWAN End Nodes.D20-LBD22-LBD23-LB_LoRaWAN_Temperature_Sensor_User_Manual.WebHome@1675071855856-879.png]]
@@ -166,12 +166,11 @@
  )))
  |(% style="width:167px" %)Fast press ACT 5 times.|(% style="width:117px" %)Deactivate Device|(% style="width:225px" %)(% style="color:red" %)**Red led**(%%) will solid on for 5 seconds. Means device is in Deep Sleep Mode.
--== 1.9 BLE connection ==
++== 1.10 BLE connection ==
--DDS45-LB support BLE remote configure.
++DDS20-LB support BLE remote configure.
--
  BLE can be used to configure the parameter of sensor or see the console output from sensor. BLE will be only activate on below case:
  * Press button to send an uplink
@@ -181,12 +181,12 @@
  If there is no activity connection on BLE in 60 seconds, sensor will shut down BLE module to enter low power mode.
--== 1.10 Pin Definitions ==
++== 1.11 Pin Definitions ==
  [[image:image-20230523174230-1.png]]
--== 1.11 Mechanical ==
++== 1.12 Mechanical ==
  [[image:Main.User Manual for LoRaWAN End Nodes.D20-LBD22-LBD23-LB_LoRaWAN_Temperature_Sensor_User_Manual.WebHome@1675143884058-338.png]]
@@ -200,15 +200,18 @@
  (% style="color:blue" %)**Probe Mechanical:**
--[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDDS45%20-%20LoRaWAN%20Distance%20Detection%20Sensor%20User%20Manual/WebHome/1654915562090-396.png?rev=1.1||alt="1654915562090-396.png"]]
++[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDDS20%20-%20LoRaWAN%20Liquid%20Level%20Sensor%20User%20Manual/WebHome/image-20220615090910-1.png?rev=1.1||alt="image-20220615090910-1.png"]]
--= 2. Configure DDS45-LB to connect to LoRaWAN network =
++[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDDS20%20-%20LoRaWAN%20Liquid%20Level%20Sensor%20User%20Manual/WebHome/image-20220615090910-2.png?rev=1.1||alt="image-20220615090910-2.png"]]
++
++= 2. Configure DDS20-LB to connect to LoRaWAN network =
++
  == 2.1 How it works ==
--The DDS45-LB is configured as (% style="color:#037691" %)**LoRaWAN OTAA Class A**(%%) mode by default. It has OTAA keys to join LoRaWAN network. To connect a local LoRaWAN network, you need to input the OTAA keys in the LoRaWAN IoT server and press the button to activate the DDS45-LB. It will automatically join the network via OTAA and start to send the sensor value. The default uplink interval is 20 minutes.
++The DDS20-LB is configured as (% style="color:#037691" %)**LoRaWAN OTAA Class A**(%%) mode by default. It has OTAA keys to join LoRaWAN network. To connect a local LoRaWAN network, you need to input the OTAA keys in the LoRaWAN IoT server and press the button to activate the DDS20-LB. It will automatically join the network via OTAA and start to send the sensor value. The default uplink interval is 20 minutes.
  (% style="display:none" %) (%%)
@@ -222,9 +222,9 @@
  [[image:image-20230613140140-4.png||height="453" width="800"]](% style="display:none" %)
--(% style="color:blue" %)**Step 1:**(%%) Create a device in TTN with the OTAA keys from DDS45-LB.
++(% style="color:blue" %)**Step 1:**(%%) Create a device in TTN with the OTAA keys from DDS20-LB.
--Each DDS45-LB is shipped with a sticker with the default device EUI as below:
++Each DDS20-LB is shipped with a sticker with the default device EUI as below:
  [[image:image-20230426084152-1.png||alt="图片-20230426084152-1.png" height="233" width="502"]]
@@ -253,10 +253,10 @@
  [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LSN50v2-S31-S31B%20LoRaWAN%20Temperature%20%26%20Humidity%20Sensor%20User%20Manual/WebHome/image-20220611161308-6.png?width=744&height=485&rev=1.1||alt="图片-20220611161308-6.png"]]
--(% style="color:blue" %)**Step 2:**(%%) Activate on DDS45-LB
++(% style="color:blue" %)**Step 2:**(%%) Activate on DDS20-LB
--Press the button for 5 seconds to activate the DDS45-LB.
++Press the button for 5 seconds to activate the DDS20-LB.
  (% style="color:green" %)**Green led**(%%) will fast blink 5 times, device will enter (% style="color:blue" %)**OTA mode**(%%) for 3 seconds. And then start to JOIN LoRaWAN network. (% style="color:green" %)**Green led**(%%) will solidly turn on for 5 seconds after joined in network.
@@ -267,7 +267,7 @@
  (((
--DDS45-LB will uplink payload via LoRaWAN with below payload format:
++DDS20-LB will uplink payload via LoRaWAN with below payload format:
  )))
  (((
@@ -291,7 +291,7 @@
  === 2.3.1  Battery Info ===
--Check the battery voltage for DDS45-LB.
++Check the battery voltage for DDS20-LB.
  Ex1: 0x0B45 = 2885mV
@@ -360,7 +360,7 @@
  The payload decoder function for TTN V3 is here:
  (((
--DDS45-LB TTN V3 Payload Decoder:  [[ttps:~~/~~/github.com/dragino/dragino-end-node-decoder>>https://github.com/dragino/dragino-end-node-decoder]]
++DDS20-LB TTN V3 Payload Decoder:  [[ttps:~~/~~/github.com/dragino/dragino-end-node-decoder>>https://github.com/dragino/dragino-end-node-decoder]]
  )))
@@ -367,7 +367,7 @@
  == 2.4  Uplink Interval ==
--The DDS45-LB by default uplink the sensor data every 20 minutes. User can change this interval by AT Command or LoRaWAN Downlink Command. See this link: [[Change Uplink Interval>>||anchor="H3.3.1SetTransmitIntervalTime"]]
++The DDS20-LB by default uplink the sensor data every 20 minutes. User can change this interval by AT Command or LoRaWAN Downlink Command. See this link: [[Change Uplink Interval>>||anchor="H3.3.1SetTransmitIntervalTime"]]
  == 2.5  Show Data in DataCake IoT Server ==
@@ -395,7 +395,7 @@
  (% style="color:blue" %)**Step 3**(%%)**: Create an account or log in Datacake.**
--(% style="color:blue" %)**Step 4**(%%)**: Search the DDS45-LB and add DevEUI.**
++(% style="color:blue" %)**Step 4**(%%)**: Search the DDS20-LB and add DevEUI.**
  [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDDS75%20-%20LoRaWAN%20Distance%20Detection%20Sensor%20User%20Manual/WebHome/1654851029373-510.png?rev=1.1||alt="1654851029373-510.png"]]
@@ -409,19 +409,19 @@
  == 2.6 Datalog Feature ==
--Datalog Feature is to ensure IoT Server can get all sampling data from Sensor even if the LoRaWAN network is down. For each sampling, DDS45-LB will store the reading for future retrieving purposes.
++Datalog Feature is to ensure IoT Server can get all sampling data from Sensor even if the LoRaWAN network is down. For each sampling, DDS20-LB will store the reading for future retrieving purposes.
  === 2.6.1 Ways to get datalog via LoRaWAN ===
--Set PNACKMD=1, DDS45-LB will wait for ACK for every uplink, when there is no LoRaWAN network,DDS45-LB will mark these records with non-ack messages and store the sensor data, and it will send all messages (10s interval) after the network recovery.
++Set PNACKMD=1, DDS20-LB will wait for ACK for every uplink, when there is no LoRaWAN network,DDS20-LB will mark these records with non-ack messages and store the sensor data, and it will send all messages (10s interval) after the network recovery.
  * (((
--a) DDS45-LB will do an ACK check for data records sending to make sure every data arrive server.
++a) DDS20-LB will do an ACK check for data records sending to make sure every data arrive server.
  )))
  * (((
--b) DDS45-LB will send data in **CONFIRMED Mode** when PNACKMD=1, but DDS45-LB won't re-transmit the packet if it doesn't get ACK, it will just mark it as a NONE-ACK message. In a future uplink if DDS45-LB gets a ACK, DDS45-LB will consider there is a network connection and resend all NONE-ACK messages.
++b) DDS20-LB will send data in **CONFIRMED Mode** when PNACKMD=1, but DDS20-LB won't re-transmit the packet if it doesn't get ACK, it will just mark it as a NONE-ACK message. In a future uplink if DDS20-LB gets a ACK, DDS20-LB will consider there is a network connection and resend all NONE-ACK messages.
  )))
  Below is the typical case for the auto-update datalog feature (Set PNACKMD=1)
@@ -432,7 +432,7 @@
  === 2.6.2 Unix TimeStamp ===
--DDS45-LB uses Unix TimeStamp format based on
++DDS20-LB uses Unix TimeStamp format based on
  [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LHT65N%20LoRaWAN%20Temperature%20%26%20Humidity%20Sensor%20Manual/WebHome/image-20220523001219-11.png?width=627&height=97&rev=1.1||alt="图片-20220523001219-11.png" height="97" width="627"]]
@@ -451,7 +451,7 @@
  User need to set (% style="color:blue" %)**SYNCMOD=1**(%%) to enable sync time via MAC command.
--Once DDS45-LB Joined LoRaWAN network, it will send the MAC command (DeviceTimeReq) and the server will reply with (DeviceTimeAns) to send the current time to DDS45-LB. If DDS45-LB fails to get the time from the server, DDS45-LB will use the internal time and wait for next time request (AT+SYNCTDC to set the time request period, default is 10 days).
++Once DDS20-LB Joined LoRaWAN network, it will send the MAC command (DeviceTimeReq) and the server will reply with (DeviceTimeAns) to send the current time to DDS20-LB. If DDS20-LB fails to get the time from the server, DDS20-LB will use the internal time and wait for next time request (AT+SYNCTDC to set the time request period, default is 10 days).
  (% style="color:red" %)**Note: LoRaWAN Server need to support LoRaWAN v1.0.3(MAC v1.0.3) or higher to support this MAC command feature, Chirpstack,TTN V3 v3 and loriot support but TTN V3 v2 doesn't support. If server doesn't support this command, it will through away uplink packet with this command, so user will lose the packet with time request for TTN V3 v2 if SYNCMOD=1.**
@@ -479,7 +479,7 @@
  )))
  (((
--Uplink Internal =5s，means DDS45-LB will send one packet every 5s. range 5~~255s.
++Uplink Internal =5s，means DDS20-LB will send one packet every 5s. range 5~~255s.
  )))
@@ -486,17 +486,17 @@
  == 2.7 Frequency Plans ==
--The DDS45-LB uses OTAA mode and below frequency plans by default. If user want to use it with different frequency plan, please refer the AT command sets.
++The DDS20-LB uses OTAA mode and below frequency plans by default. If user want to use it with different frequency plan, please refer the AT command sets.
  [[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20Frequency%20Band/>>http://wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20Frequency%20Band/]]
--= 3. Configure DDS45-LB =
++= 3. Configure DDS20-LB =
  == 3.1 Configure Methods ==
--DDS45-LB supports below configure method:
++DDS20-LB supports below configure method:
  * AT Command via Bluetooth Connection (**Recommended**): [[BLE Configure Instruction>>http://wiki.dragino.com/xwiki/bin/view/Main/BLE%20Bluetooth%20Remote%20Configure/]].
@@ -518,10 +518,10 @@
  [[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20AT%20Commands%20and%20Downlink%20Command/>>http://wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20AT%20Commands%20and%20Downlink%20Command/]]
--== 3.3 Commands special design for DDS45-LB ==
++== 3.3 Commands special design for DDS20-LB ==
--These commands only valid for DDS45-LB, as below:
++These commands only valid for DDS20-LB, as below:
  === 3.3.1 Set Transmit Interval Time ===
@@ -603,7 +603,7 @@
  = 4. Battery & Power Consumption =
--DDS45-LB use ER26500 + SPC1520 battery pack. See below link for detail information about the battery info and how to replace.
++DDS20-LB use ER26500 + SPC1520 battery pack. See below link for detail information about the battery info and how to replace.
  [[**Battery Info & Power Consumption Analyze**>>http://wiki.dragino.com/xwiki/bin/view/Main/How%20to%20calculate%20the%20battery%20life%20of%20Dragino%20sensors%3F/]] .
@@ -612,7 +612,7 @@
  (% class="wikigeneratedid" %)
--User can change firmware DDS45-LB to:
++User can change firmware DDS20-LB to:
  * Change Frequency band/ region.
@@ -620,7 +620,7 @@
  * Fix bugs.
--Firmware and changelog can be downloaded from : **[[Firmware download link>>url:https://www.dropbox.com/sh/a5ue0nfrzqy9nz6/AABbvlATosDJKDwBmbirVbMYa?dl=0]]**
++Firmware and changelog can be downloaded from : **[[Firmware download link>>url:https://www.dropbox.com/sh/ph4uyz0rchflrnw/AADr1f_5Sg30804NItpfOQbla?dl=0]]**
  Methods to Update Firmware:
@@ -630,16 +630,16 @@
  = 6. FAQ =
--== 6.1  What is the frequency plan for DDS45-LB? ==
++== 6.1  What is the frequency plan for DDS20-LB? ==
--DDS45-LB use the same frequency as other Dragino products. User can see the detail from this link:  [[Introduction>>doc:Main.End Device Frequency Band.WebHome||anchor="H1.Introduction"]]
++DDS20-LB use the same frequency as other Dragino products. User can see the detail from this link:  [[Introduction>>doc:Main.End Device Frequency Band.WebHome||anchor="H1.Introduction"]]
--== 6.2  Can I use DDS45-LB in condensation environment? ==
++== 6.2  Can I use DDS20-LB in condensation environment? ==
--DDS45-LB is not suitable to be used in condensation environment. Condensation on the DDS45-LB probe will affect the reading and always got 0.
++DDS20-LB is not suitable to be used in condensation environment. Condensation on the DDS20-LB probe will affect the reading and always got 0.
  = 7.  Trouble Shooting =
@@ -656,41 +656,20 @@
  In the case if user can see the console output but can't type input to the device. Please check if you already include the (% style="color:blue" %)**ENTER**(%%) while sending out the command. Some serial tool doesn't send (% style="color:blue" %)**ENTER**(%%) while press the send key, user need to add ENTER in their string.
--== 7.3  Why does the sensor reading show 0 or "No sensor" ==
++== 7.3  Why i always see 0x0000 or 0 for the distance value? ==
--~1. The measurement object is very close to the sensor, but in the blind spot of the sensor.
++(((
++LDDS20 has a strict [[**installation requirement**>>||anchor="H1.5A0InstallLDDS20"]]. Please make sure the installation method exactly follows up with the installation requirement. Otherwise, the reading might be always 0x00.
--2. Sensor wiring is disconnected
++If you have followed the instruction requirement exactly but still see the 0x00 reading issue, please. please double-check the decoder, you can check the raw payload to verify.
++)))
--3. Not using the correct decoder
--
--== 7.4  Abnormal readings The gap between multiple readings is too large or the gap between the readings and the actual value is too large ==
--
--
--1) Please check if there is something on the probe affecting its measurement (condensed water, volatile oil, etc.)
--
--2) Does it change with temperature, temperature will affect its measurement
--
--3) If abnormal data occurs, you can turn on DEBUG mode, Please use downlink or AT COMMAN to enter DEBUG mode.
--
--downlink command: (% style="color:blue" %)**F1 01**(%%), AT command: (% style="color:blue" %)**AT+DDEBUG=1**
--
--4) After entering the debug mode, it will send 20 pieces of data at a time, and you can send its uplink to us for analysis
--
--[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDDS75%20-%20LoRaWAN%20Distance%20Detection%20Sensor%20User%20Manual/WebHome/image-20230113135125-2.png?width=1057&height=136&rev=1.1||alt="image-20230113135125-2.png"]]
--
--
--Its original payload will be longer than other data. Even though it is being parsed, it can be seen that it is abnormal data.
--
--Please send the data to us for check.
--
--
  = 8. Order Info =
--Part Number: (% style="color:blue" %)**DDS45-LB-XXX**
++Part Number: (% style="color:blue" %)**DDS20-LB-XXX**
  (% style="color:red" %)**XXX**(%%): **The default frequency band**
@@ -710,12 +710,15 @@
  * (% style="color:red" %)**CN470**(%%): LoRaWAN CN470 band
++
++
++
  = 9. Packing Info =
  (% style="color:#037691" %)**Package Includes**:
--* DDS45-LB LoRaWAN Distance Detection Sensor x 1
++* DDS20-LB LoRaWAN Ultrasonic Liquid Level Sensor x 1
  (% style="color:#037691" %)**Dimension and weight**:
@@ -727,6 +727,9 @@
  * Weight / pcs : g
++
++
++
  = 10. Support =

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