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

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

From 79.4 to 79.3 From 80.3 to 80.2

From version 80.2

edited by Xiaoling
on 2023/06/14 15:52

Change comment: There is no comment for this version

To version 79.4

edited by Xiaoling
on 2023/06/13 14:39

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Title

@@ -1,1 +1,1 @@
--LDS12-LB -- LoRaWAN LiDAR ToF Distance Sensor User Manual
++DDS20-LB -- LoRaWAN Ultrasonic Liquid Level Sensor User Manual

Content

@@ -1,5 +1,5 @@
  (% style="text-align:center" %)
--[[image:image-20230614153353-1.png]]
++[[image:image-20230613133716-2.png||height="717" width="717"]]
@@ -7,6 +7,7 @@
++
  **Table of Contents：**
  {{toc/}}
@@ -18,14 +18,14 @@
  = 1. Introduction =
--== 1.1 What is LoRaWAN LiDAR ToF Distance Sensor ==
++== 1.1 What is LoRaWAN Ultrasonic liquid level Sensor ==
--The Dragino LLDS12 is a (% style="color:blue" %)**LoRaWAN LiDAR ToF (Time of Flight) Distance Sensor**(%%) for Internet of Things solution. It is capable to measure the distance to an object as close as 10 centimeters (+/- 5cm up to 6m) and as far as 12 meters (+/-1% starting at 6m)!. The LiDAR probe uses laser induction technology for distance measurement.
++The Dragino DDS20-LB is a (% style="color:blue" %)**LoRaWAN Ultrasonic liquid level sensor**(%%) for Internet of Things solution. It uses (% style="color:blue" %)**none-contact method **(%%)to measure the (% style="color:blue" %)**height of liquid**(%%) in a container without opening the container, and send the value via LoRaWAN network to IoT Server.
--The LLDS12 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.
++The DDS20-LB sensor is installed directly below the container to detect the height of the liquid level. User doesn't need to open a hole on the container to be tested. The none-contact measurement makes the measurement safety, easier and possible for some strict situation.
--It detects the distance between the measured object and the sensor, and uploads the value via wireless to LoRaWAN IoT Server.
++DDS20-LB uses (% style="color:blue" %)**ultrasonic sensing technology**(%%) for distance measurement. DDS20-LB is of high accuracy to measure various liquid such as: (% style="color:blue" %)**toxic substances**(%%), (% style="color:blue" %)**strong acids**(%%), (% style="color:blue" %)**strong alkalis**(%%) and (% style="color:blue" %)**various pure liquids**(%%) in high-temperature and high-pressure airtight containers.
  The LoRa wireless technology used in DDS20-LB allows device to send data and reach extremely long ranges at low data-rates. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption.
@@ -56,7 +56,6 @@
  * IP66 Waterproof Enclosure
  * 8500mAh Battery for long term use
--
  == 1.3 Specification ==
@@ -85,7 +85,6 @@
  * Sleep Mode: 5uA @ 3.3v
  * LoRa Transmit Mode: 125mA @ 20dBm, 82mA @ 14dBm
--
  == 1.4 Suitable Container & Liquid ==
@@ -94,15 +94,13 @@
  * Container Thickness:
  ** Pure metal material.  2~~8mm, best is 3~~5mm
  ** Pure non metal material: <10 mm
--* Pure liquid without irregular deposition.
++* Pure liquid without irregular deposition.(% style="display:none" %)
--(% style="display:none" %)
--
  == 1.5 Install DDS20-LB ==
--(% style="color:blue" %)**Step 1**(%%):  ** Choose the installation point.**
++(% style="color:blue" %)**Step 1**(%%):   Choose the installation point.
  DDS20-LB (% style="color:red" %)**MUST**(%%) be installed on the container bottom middle position.
@@ -110,7 +110,7 @@
  (((
--(% style="color:blue" %)**Step 2**(%%):   **Polish the installation point.**
++(% style="color:blue" %)**Step 2**(%%):   Polish the installation point.
  )))
  (((
@@ -126,7 +126,7 @@
  (((
--(% style="color:blue" %)**Step3:   **(%%)**Test the installation point.**
++(% style="color:blue" %)**Step3:   **(%%)Test the installation point.
  )))
  (((
@@ -143,11 +143,11 @@
  (((
--(% style="color:blue" %)**LED Status:**
++(% style="color:red" %)**LED Status:**
  )))
  * (((
--**Onboard LED**: When power on device, the onboard LED will fast blink 4 times which means detect the sensor well.
++Onboard LED: When power on device, the onboard LED will fast blink 4 times which means detect the sensor well.
  )))
  * (((
@@ -163,12 +163,16 @@
  (((
--(% style="color:red" %)**Note :**(%%)** (% style="color:blue" %)Ultrasonic coupling paste(%%)**(% style="color:blue" %) (%%) is subjected in most shipping way. So the default package doesn't include it and user needs to purchase locally.
++(% 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.**
++(% style="color:blue" %)**Step4:   **(%%)Install use Epoxy ab glue.
  )))
  (((
@@ -187,13 +187,11 @@
  (((
--(% style="color:red" %)**Note :**
--
--(% style="color:red" %)**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 1:**(%%) 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" %)**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.
++(% 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.
  )))
@@ -200,11 +200,12 @@
  == 1.6 Applications ==
--* Smart liquid control solution
++* Smart liquid control solution.
--* Smart liquefied gas solution
++* Smart liquefied gas solution.
++
  == 1.7 Precautions ==
@@ -212,9 +212,8 @@
  * 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.
++* 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" %)
--(% style="display:none" %)
  == 1.8 Sleep mode and working mode ==
@@ -243,7 +243,6 @@
  )))
  |(% 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.
--
  == 1.10 BLE connection ==
@@ -288,7 +288,7 @@
  == 2.1 How it works ==
--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.
++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.
  (% style="display:none" %) (%%)
@@ -302,9 +302,9 @@
  [[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 DDS20-LB.
++(% style="color:blue" %)**Step 1:**(%%) Create a device in TTN with the OTAA keys from DDS45-LB.
--Each DDS20-LB is shipped with a sticker with the default device EUI as below:
++Each DDS45-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"]]
@@ -333,10 +333,10 @@
  [[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 DDS20-LB
++(% style="color:blue" %)**Step 2:**(%%) Activate on DDS45-LB
--Press the button for 5 seconds to activate the DDS20-LB.
++Press the button for 5 seconds to activate the DDS45-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.
@@ -347,7 +347,7 @@
  (((
--DDS20-LB will uplink payload via LoRaWAN with below payload format:
++DDS45-LB will uplink payload via LoRaWAN with below payload format:
  )))
  (((
@@ -358,7 +358,7 @@
  |=(% style="width: 62.5px;background-color:#D9E2F3;color:#0070C0" %)(((
  **Size(bytes)**
  )))|=(% style="width: 62.5px;background-color:#D9E2F3;color:#0070C0" %)**2**|=(% style="background-color:#D9E2F3;color:#0070C0" %)**2**|=(% style="background-color:#D9E2F3;color:#0070C0" %)1|=(% style="background-color:#D9E2F3;color:#0070C0" %)2|=(% style="background-color:#D9E2F3;color:#0070C0" %)**1**
--|(% style="width:62.5px" %)Value|(% style="width:62.5px" %)[[BAT>>||anchor="H2.3.1A0BatteryInfo"]]|(((
++|(% style="width:62.5px" %)**Value**|(% style="width:62.5px" %)[[BAT>>||anchor="H2.3.1A0BatteryInfo"]]|(((
  [[Distance>>||anchor="H2.3.2A0Distance"]]
  (unit: mm)
  )))|[[Digital Interrupt (Optional)>>||anchor="H2.3.3A0InterruptPin"]]|(((
@@ -365,13 +365,13 @@
  [[Temperature (Optional )>>||anchor="H2.3.4A0DS18B20Temperaturesensor"]]
  )))|[[Sensor Flag>>||anchor="H2.3.5A0SensorFlag"]]
--[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDDS20%20-%20LoRaWAN%20Liquid%20Level%20Sensor%20User%20Manual/WebHome/1654850511545-399.png?rev=1.1||alt="1654850511545-399.png"]]
++[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDDS75%20-%20LoRaWAN%20Distance%20Detection%20Sensor%20User%20Manual/WebHome/1654850511545-399.png?rev=1.1||alt="1654850511545-399.png"]]
  === 2.3.1  Battery Info ===
--Check the battery voltage for DDS20-LB.
++Check the battery voltage for DDS45-LB.
  Ex1: 0x0B45 = 2885mV
@@ -382,20 +382,18 @@
  (((
--Get the distance. Flat object range 20mm - 2000mm.
++Get the distance. Flat object range 30mm - 4500mm.
  )))
  (((
--For example, if the data you get from the register is **0x06 0x05**, the distance between the sensor and the measured object is(% style="color:#4472c4" %)** **
++For example, if the data you get from the register is **0x0B 0x05**, the distance between the sensor and the measured object is(% style="color:#4472c4" %)** **
--(% style="color:blue" %)**0605(H) = 1541 (D) = 1541 mm.**
++(% style="color:blue" %)**0B05(H) = 2821 (D) = 2821 mm.**
  )))
  * If the sensor value is 0x0000, it means system doesn't detect ultrasonic sensor.
++* If the sensor value lower than 0x001E (30mm), the sensor value will be 0x00.
--* If the sensor value lower than 0x0014 (20mm), the sensor value will be invalid.
--
--
  === 2.3.3  Interrupt Pin ===
@@ -442,7 +442,7 @@
  The payload decoder function for TTN V3 is here:
  (((
--DDS20-LB TTN V3 Payload Decoder:  [[ttps:~~/~~/github.com/dragino/dragino-end-node-decoder>>https://github.com/dragino/dragino-end-node-decoder]]
++DDS45-LB TTN V3 Payload Decoder:  [[ttps:~~/~~/github.com/dragino/dragino-end-node-decoder>>https://github.com/dragino/dragino-end-node-decoder]]
  )))
@@ -449,7 +449,7 @@
  == 2.4  Uplink Interval ==
--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"]]
++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"]]
  == 2.5  Show Data in DataCake IoT Server ==
@@ -477,7 +477,7 @@
  (% style="color:blue" %)**Step 3**(%%)**: Create an account or log in Datacake.**
--(% style="color:blue" %)**Step 4**(%%)**: Search the DDS20-LB and add DevEUI.**
++(% style="color:blue" %)**Step 4**(%%)**: Search the DDS45-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"]]
@@ -487,22 +487,23 @@
  [[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-20220610165129-11.png?width=1088&height=595&rev=1.1||alt="image-20220610165129-11.png"]]
++
  == 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, DDS20-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, DDS45-LB will store the reading for future retrieving purposes.
  === 2.6.1 Ways to get datalog via LoRaWAN ===
--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.
++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.
  * (((
--a) DDS20-LB will do an ACK check for data records sending to make sure every data arrive server.
++a) DDS45-LB will do an ACK check for data records sending to make sure every data arrive server.
  )))
  * (((
--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.
++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.
  )))
  Below is the typical case for the auto-update datalog feature (Set PNACKMD=1)
@@ -513,7 +513,7 @@
  === 2.6.2 Unix TimeStamp ===
--DDS20-LB uses Unix TimeStamp format based on
++DDS45-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"]]
@@ -532,7 +532,7 @@
  User need to set (% style="color:blue" %)**SYNCMOD=1**(%%) to enable sync time via MAC command.
--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).
++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).
  (% 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.**
@@ -560,7 +560,7 @@
  )))
  (((
--Uplink Internal =5s，means DDS20-LB will send one packet every 5s. range 5~~255s.
++Uplink Internal =5s，means DDS45-LB will send one packet every 5s. range 5~~255s.
  )))
@@ -567,17 +567,17 @@
  == 2.7 Frequency Plans ==
--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.
++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.
  [[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 DDS20-LB =
++= 3. Configure DDS45-LB =
  == 3.1 Configure Methods ==
--DDS20-LB supports below configure method:
++DDS45-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/]].
@@ -585,7 +585,6 @@
  * LoRaWAN Downlink.  Instruction for different platforms: See [[IoT LoRaWAN Server>>http://wiki.dragino.com/xwiki/bin/view/Main/]] section.
--
  == 3.2 General Commands ==
@@ -600,10 +600,10 @@
  [[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 DDS20-LB ==
++== 3.3 Commands special design for DDS45-LB ==
--These commands only valid for DDS20-LB, as below:
++These commands only valid for DDS45-LB, as below:
  === 3.3.1 Set Transmit Interval Time ===
@@ -646,9 +646,6 @@
  )))
  * (((
  Example 2: Downlink Payload: 0100003C      ~/~/ Set Transmit Interval (TDC) = 60 seconds
--
--
--
  )))
  === 3.3.2 Set Interrupt Mode ===
@@ -685,11 +685,10 @@
  * Example 2: Downlink Payload: 06000003      ~/~/   Set the interrupt mode to rising edge trigger
--
  = 4. Battery & Power Consumption =
--DDS20-LB use ER26500 + SPC1520 battery pack. See below link for detail information about the battery info and how to replace.
++DDS45-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/]] .
@@ -698,7 +698,7 @@
  (% class="wikigeneratedid" %)
--User can change firmware DDS20-LB to:
++User can change firmware DDS45-LB to:
  * Change Frequency band/ region.
@@ -706,27 +706,26 @@
  * Fix bugs.
--Firmware and changelog can be downloaded from : **[[Firmware download link>>url:https://www.dropbox.com/sh/ph4uyz0rchflrnw/AADr1f_5Sg30804NItpfOQbla?dl=0]]**
++Firmware and changelog can be downloaded from : **[[Firmware download link>>url:https://www.dropbox.com/sh/a5ue0nfrzqy9nz6/AABbvlATosDJKDwBmbirVbMYa?dl=0]]**
  Methods to Update Firmware:
--* (Recommanded way) OTA firmware update via wireless:  **[[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/Firmware%20OTA%20Update%20for%20Sensors/>>url:http://wiki.dragino.com/xwiki/bin/view/Main/Firmware%20OTA%20Update%20for%20Sensors/]]**
++* (Recommanded way) OTA firmware update via wireless:  [[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/Firmware%20OTA%20Update%20for%20Sensors/>>url:http://wiki.dragino.com/xwiki/bin/view/Main/Firmware%20OTA%20Update%20for%20Sensors/]]
  * Update through UART TTL interface: **[[Instruction>>url:http://wiki.dragino.com/xwiki/bin/view/Main/UART%20Access%20for%20LoRa%20ST%20v4%20base%20model/#H1.LoRaSTv4baseHardware]]**.
--
  = 6. FAQ =
--== 6.1  What is the frequency plan for DDS20-LB? ==
++== 6.1  What is the frequency plan for DDS45-LB? ==
--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"]]
++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"]]
--== 6.2  Can I use DDS20-LB in condensation environment? ==
++== 6.2  Can I use DDS45-LB in condensation environment? ==
--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.
++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.
  = 7.  Trouble Shooting =
@@ -743,20 +743,41 @@
  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 i always see 0x0000 or 0 for the distance value? ==
++== 7.3  Why does the sensor reading show 0 or "No sensor" ==
--(((
--LDDS20 has a strict [[**installation requirement**>>||anchor="H1.5A0InstallDDS20-LB"]]. Please make sure the installation method exactly follows up with the installation requirement. Otherwise, the reading might be always 0x00.
++~1. The measurement object is very close to the sensor, but in the blind spot of the sensor.
--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.
--)))
++2. Sensor wiring is disconnected
++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" %)**DDS20-LB-XXX**
++Part Number: (% style="color:blue" %)**DDS45-LB-XXX**
  (% style="color:red" %)**XXX**(%%): **The default frequency band**
@@ -776,13 +776,12 @@
  * (% style="color:red" %)**CN470**(%%): LoRaWAN CN470 band
--
  = 9. Packing Info =
  (% style="color:#037691" %)**Package Includes**:
--* DDS20-LB LoRaWAN Ultrasonic Liquid Level Sensor x 1
++* DDS45-LB LoRaWAN Distance Detection Sensor x 1
  (% style="color:#037691" %)**Dimension and weight**:
@@ -794,7 +794,6 @@
  * Weight / pcs : g
--
  = 10. Support =

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