Table of Contents:

1.  Introduction

1.1 ​ What is LSN50V2-D2x LoRaWAN Temperature Sensor

The Dragino LSN50v2-D2x is a LoRaWAN Temperature Sensor for Internet of Things solution. It can be used to measure the temperature of air, liquid or object, and then upload to IoT server via LoRaWAN wireless protocol. 

The temperature sensor used in LSN50v2-D2x can measure -55°C ~ 125°C with accuracy ±0.5°C (max ±2.0 °C).

LSN50v2-D2x supports temperature alarm feature, user can set temperature alarm for instant notice.

LSN50v2-D2x has max 3 probes which measure maximum 3 temperature points.

LSN50v2-D2x is powered by 8500mAh Li-SOCI2 battery, it is designed for long term use up to 10 years. (Actually Battery life depends on the use environment, update period. Please check related Power Analyze report).

Each LSN50v2-D2x is pre-load with a set of unique keys for LoRaWAN registration, register these keys to local LoRaWAN server and it will auto connect after power on.

1.2  Specifications

Common DC Characteristics:

• Supply Voltage: built in 8500mAh Li-SOCI2 battery
• Operating Temperature: -40 ~ 85°C

Temperature Sensor:

• Range: -55 to + 125°C
• Accuracy ±0.5°C (max ±2.0 °C).

LoRa Spec:

• Frequency Range,  
  • Band 1 (HF): 862 ~ 1020 Mhz
• 168 dB maximum link budget.
• High sensitivity: down to -148 dBm.
• Bullet-proof front end: IIP3 = -12.5 dBm.
• Excellent blocking immunity.
• Built-in bit synchronizer for clock recovery.
• Preamble detection.
• 127 dB Dynamic Range RSSI.
• Automatic RF Sense and CAD with ultra-fast AFC.
• LoRaWAN 1.0.3 Specification

Power Consumption

• Sleeping Mode: 20uA
• LoRaWAN Transmit Mode: 125mA @ 20dBm 44mA @ 14dBm

​1.3  Features

• LoRaWAN v1.0.3 Class A
• Ultra-low power consumption
• 1 ~ 3 External Temperature Probes
• Measure range -55°C ~ 125°C
• Temperature alarm
• Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/IN865
• AT Commands to change parameters
• Uplink on periodically or Interrupt
• Downlink to change configure
• 8500mAh Battery for long term use

1.4 ​ Applications

• Wireless Alarm and Security Systems
• Home and Building Automation
• Automated Meter Reading
• Industrial Monitoring and Control
• Long range Irrigation Systems,etc.

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1.5  Hardware Variant

Model	Photo	Probe Info
LSN50v2 D20		1 x DS28B20 Probe Cable Length : 2 meters sensor cable is made by Silica Gel for higher temperature tolerance.
LSN50v2 D22		2 x DS28B20 Probes Cable lengths total 1.5meters per probe Cable Drawing: See This Link
LSN50v2 D23		3 x DS28B20 Probes Cable lengths total 1.5meters per probe Cable Drawing: See This Link

1.6  Pin Definitions and Switch

1.6.1  Pin Definition

The device is pre-configured to connect to temperature sensor. The other pins are not used. If user want to know more about other pins, please refer the user manual of LSn50v2 at: http://www.dragino.com/downloads/index.php?dir=LSN50-LoRaST/

1.6.2  Jumper JP2

Power on Device when put this jumper.

1.6.3  BOOT MODE / SW1

1. ISP:     upgrade mode, device won't have any signal in this mode. but ready for upgrade firmware. LED won't work. Firmware won't run.

2. Flash:  work mode, device starts to work and send out console output for further debug

1.6.4  Reset Button

Press to reboot the device.

1.6.5  LED

It will flash:

1. When boot the device in flash mode
2. Send an uplink packet

1.7  Hardware Change log

LSN50v2-D20 v1.0:  Release.

2.  How to use LSN50v2-D2x?

2.1  How it works

2.2  ​Quick guide to connect to LoRaWAN server (OTAA)

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Add APP EUI and DEV EUI：

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Add APP EUI in the application：

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Add APP KEY

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Step 2: Power on LSN50v2-D20

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2.3  ​Uplink Payload

Battery:

Check the battery voltage.

Ex1: 0x0B45 = 2885mV

Ex2: 0x0B49 = 2889mV

Temperature RED or Temperature White :

This point to the Red probe in LSN50 v2-D20 or the probe of LSN50v2- D22/D23 White

Example:

If payload is: 0105H:  (0105 & FC00 == 0), temp = 0105H /10 = 26.1 degree

If payload is: FF3FH :  (FF3F & FC00 == 1) , temp = (FF3FH - 65536)/10 = -19.3 degrees.

Temperature White:

This point to the Red probe in LSN50 v2-D22/D23

Example:

If payload is: 0105H:  (0105 & FC00 == 0), temp = 0105H /10 = 26.1 degree

If payload is: FF3FH :  (FF3F & FC00 == 1) , temp = (FF3FH - 65536)/10 = -19.3 degrees.

Temperature Black:

This point to the BLACK probe in LSN50 v2-D23

Example:

If payload is: 0105H:  (0105 & FC00 == 0), temp = 0105H /10 = 26.1 degree

If payload is: FF3FH :  (FF3F & FC00 == 1) , temp = (FF3FH - 65536)/10 = -19.3 degrees.

Alarm Flag& MOD:

Example:

If payload & 0x01 = 0x01  --> This is an Alarm Message

If payload & 0x01 = 0x00  --> This is a normal uplink message, no alarm

If payload >> 2 = 0x00     -->  means MOD=1, This is a sampling uplink message

If payload >> 2 = 0x31     -->  means MOD=31, this message is a reply message for polling, this message contains the alarm settings. see this link for detail.

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2.3.2  Decode payload in The Things Network

In TTN, use can add a custom payload so it shows friendly.  

In the page Applications --> Payload Formats --> Custom --> decoder to add the decoder from:

http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LSN50v2-D20/Decoder/

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2.4  Temperature Alarm Feature

LSN50V2-D20 work flow with Alarm feature.

Below is an example of the Alarm Packet.

2.5  ​Configure LSN50v2-D20

LSN50V2-D20 supports configuration via LoRaWAN downlink command or AT Commands.

• Downlink command instructions for different platform: Use Note for Server(IoT LoRaWAN Server)
• AT Command Access Instructions: LINK

There are two parts of commands: General one and Special for this model.

2.5.1  General Configure Commands

These commands are to configure:

• General system settings like: uplink interval.
• LoRaWAN protocol & radio related command.

These commands can be found on the wiki:  End Device AT Commands and Downlink Commands

2.5.2  Sensor related commands

Set Alarm Threshold:

1.  Set All Probes:

AT+18ALARM=min,max

• When min=0, and max≠0, Alarm trigger when higher than max
• When min≠0, and max=0, Alarm trigger when lower than min
• When min≠0 and max≠0, Alarm trigger when higher than max or lower than min

Example:

   AT+18ALARM=-10,30    // Alarm when < -10 or higher than 30.

• Downlink Payload:

0x(0B F6 1E)   // Same as AT+18ALARM=-10,30

(note: 0x1E= 30, 0xF6 means: 0xF6-0x100 = -10)

2.  Set Separate Probe:

AT+18ALARM=min,max,index

Index:

• 1: Temperature_Red
• 2: Temperature_White
• 3: Temperature_Black

Example:

   AT+18ALARM=-10,30,1   // Alarm when temperature_red < -10 or higher than 30.

• Downlink Payload:

0x(0B F6 1E 01)   // Same as AT+18ALARM=-10,30,1

(note: 0x1E= 30, 0xF6 means: 0xF6-0x100 = -10)

Set Alarm Interval:

The shortest time of two Alarm packet. (unit: min)

• AT Command:

AT+ATDC=30  // The shortest interval of two Alarm packets is 30 minutes, Means is there is an alarm packet uplink, there won't be another one in the next 30 minutes.

• Downlink Payload:

0x(0D 00 1E)     ---> Set AT+ATDC=0x 00 1E = 30 minutes

Poll the Alarm settings:

Send a LoRaWAN downlink to ask device send Alarm settings.

• Downlink Payload:

0x0E 01

Example:

Explain:

• Alarm & MOD bit is 0x7C, 0x7C >> 2 = 0x31: Means this message is the Alarm settings message.

2.6  LED Status

LSN50-v2-D20 has an internal LED, it will active in below situation:

• LED will fast blink 5 times when boot, this means the temperature sensor is detected.
• After the fast blinks on boot, the LED will flash once which means device is trying to send Join Packet to the network.
• If device successful join LoRaWAN network, the LED will be solid on for 5 seconds.

2.7  Button Function

Internal RESET button:

Press this button will reboot the device. Device will process OTAA Join to network again.

2.8  ​Firmware Change Log

Firmware download link: https://www.dragino.com/downloads/index.php?dir=LSN50-LoRaST/Firmware/LSN50.hex/

Firmware Upgrade Method: Firmware Upgrade Instruction

3.  Configure LDDS04 via AT Command or LoRaWAN Downlink

• AT Command Connection: See FAQ.

• LoRaWAN Downlink instruction for different platforms: IoT LoRaWAN Server

•  General Commands.

• General system settings like: uplink interval.

• LoRaWAN protocol & radio related command.

•  Commands special design for LDDS04

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3.1  Set Transmit Interval Time

Feature: Change LoRaWAN End Node Transmit Interval.

AT Command: AT+TDC

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3.2  Set Interrupt Mode

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• Example 1: Downlink Payload: 06000000 // Turn off interrupt mode

• Example 2: Downlink Payload: 06000003 // Set the interrupt mode to rising edge trigger

3.3  Get Firmware Version Info

Feature: use downlink to get firmware version.

Downlink Command: 0x26

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• Reply to the confirmation package: 26 01
• Reply to non-confirmed packet: 26 00

Device will send an uplink after got this downlink command. With below payload:

Configures info payload:

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Software Type: Always 0x03 for LDDS04

Frequency Band:

*0x01: EU868

*0x02: US915

*0x03: IN865

*0x04: AU915

*0x05: KZ865

*0x06: RU864

*0x07: AS923

*0x08: AS923-1

*0x09: AS923-2

*0xa0: AS923-3

Sub-Band: value 0x00 ~ 0x08

Firmware Version: 0x0100, Means: v1.0.0 version

Sensor Type:

0x01: LSE01

0x02: LDDS75

0x03: LDDS20

0x04: LLMS01

0x05: LSPH01

0x06: LSNPK01

0x07: LLDS12

4. Battery & How to replace

4.1 Battery Type

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Minimum Working Voltage for the LDDS04:

LDDS04:  2.45v ~ 3.6v

4.2 Replace Battery

4.3 Power Consumption Analyze

Step 1 :  Downlink the up-to-date DRAGINO_Battery_Life_Prediction_Table.xlsx from:

https://www.dragino.com/downloads/index.pHp?dir=LoRa_End_Node/Battery_Analyze/

Step 2 :  Open it and choose

• Product Model
• Uplink Interval
• Working Mode

And the Life expectation in difference case will be shown on the right.

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The battery related documents as below:

• Battery Dimension,

• Lithium-Thionyl Chloride Battery  datasheet,

• Lithium-ion Battery-Capacitor datasheet, Tech Spec

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4.3.1 ​Battery Note

​4.3.2 Replace the battery

5.  Use AT Command

5.1  Access AT Commands

LDDS04 supports AT Command set in the stock firmware. You can use a USB to TTL adapter to connect to LDDS04 for using AT command, as below.

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Connection:

 USB TTL GND <----> GND

 USB TTL TXD  <----> UART_RXD

 USB TTL RXD  <----> UART_TXD

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Valid AT Command please check Configure Device.

6.  FAQ

6.1  How to change the LoRa Frequency Bands/Region

You can follow the instructions for how to upgrade image.
When downloading the images, choose the required image file for download. ​

7.  Trouble Shooting

7.1  AT Command input doesn't work

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 ENTER while sending out the command. Some serial tool doesn’t send ENTER while press the send key, user need to add ENTER in their string. 

8.  Order Info

8.1  Main Device LDDS04

Part Number : LDDS04-XX

XX: The default frequency band

• AS923 : LoRaWAN AS923 band
• AU915 : LoRaWAN AU915 band
• EU433 : LoRaWAN EU433 band
• EU868 : LoRaWAN EU868 band
• KR920 : LoRaWAN KR920 band
• US915 : LoRaWAN US915 band
• IN865 :  LoRaWAN IN865 band
• CN470 : LoRaWAN CN470 band

8.2  Probe Model

Detail See Probe Option Section

• A01A-15
• A02-15
• A13-15
• A16-15

9. ​ Packing Info

Package Includes:

• LDDS04 LoRaWAN 4-Channels Distance Sensor x 1

Dimension and weight:

• Device Size: cm
• Device Weight: g
• Package Size / pcs : cm
• Weight / pcs : g

10.  ​Support

• 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.
• Provide as much information as possible regarding your enquiry (product models, accurately describe your problem and steps to replicate it etc) and send a mail to support@dragino.com.