Elecom LSN50v2-S31 User manual

LSN50v2-S31-S31B LoRaWAN Temperature &
Humidity Sensor User Manual
last modified by Xiaoling
on 2023/04/28 10:19

User Manual for LoRaWAN End Nodes - LSN50v2-S31-
S31B LoRaWAN Temperature & Humidity Sensor User Manual
Table of Contents
1. Introduction ........................................................................................................................................................................ 4
1.1 What is LSN50V2-S31 LoRaWAN Temperature & Humidity Sensor .................................................................... 4
1.2 Specifications ................................................................................................................................................................ 5
1.3 Features ........................................................................................................................................................................ 6
1.4 Applications ................................................................................................................................................................... 6
1.5 Pin Definitions and Switch .......................................................................................................................................... 6
1.5.1 Pin Definition ........................................................................................................................................................... 7
1.5.2 Jumper JP2 ............................................................................................................................................................. 7
1.5.3 BOOT MODE / SW1 .............................................................................................................................................. 7
1.5.4 Reset Button ............................................................................................................................................................ 7
1.5.5 LED ........................................................................................................................................................................... 7
1.5.6 Probe Dimension .................................................................................................................................................... 8
1.6 Hardware Variant ........................................................................................................................................................ 8
2. How to use LSN50v2-S31? ............................................................................................................................................ 8
2.1 How it works ................................................................................................................................................................. 8
2.2 Quick guide to connect to LoRaWAN server (OTAA) ............................................................................................. 9
2.3 Uplink Payload ............................................................................................................................................................ 14
2.3.1 Payload Analyze ................................................................................................................................................... 14
2.3.2 Payload Decoder file ............................................................................................................................................ 15
2.3.3 Historical Temperature and humidity of S31, FPORT=3（Since firmware 1.8.0） ........................................ 15
2.4Datalog Feature ........................................................................................................................................................... 17
2.4.1 Unix TimeStamp .................................................................................................................................................... 17
2.4.2 Set Device Time .................................................................................................................................................... 18
2.4.3 Poll sensor value ................................................................................................................................................... 18
2.4.4 Clear Flash Record ............................................................................................................................................... 18
2.4.5 Set system time ................................................................................................................................................... 19
2.4.6 Set Time Sync Mode ........................................................................................................................................... 19
2.5 Temperature & HumidityAlarm Feature ................................................................................................................. 19
2.6 Configure LSN50v2-S31 ........................................................................................................................................... 21
2.6.1 General Configure Commands ........................................................................................................................... 21
2.6.2 Sensor related commands .................................................................................................................................. 21
2.7 LED Status ................................................................................................................................................................. 23
2.8 Button Function .......................................................................................................................................................... 23
2.9 Firmware Change Log ............................................................................................................................................... 23
3. Battery & Power Consumption ...................................................................................................................................... 23
4. Use AT Command .......................................................................................................................................................... 23
4.1 Access AT Commands ............................................................................................................................................. 23
5. FAQ .................................................................................................................................................................................. 25
5.1 What is the frequency range of LSN50v2-S31? .................................................................................................... 25
5.2 What is the Frequency Plan? ................................................................................................................................... 25
5.3 How to update the firmware? ................................................................................................................................... 25
6. Trouble Shooting ............................................................................................................................................................ 26
6.1 AT Command input doesn't work ............................................................................................................................ 26
6.2 Abnormal temperature ................................................................................................................................................ 26
7. Order Info ........................................................................................................................................................................ 26
8. Packing Info ..................................................................................................................................................................... 26
9. Support ............................................................................................................................................................................. 26
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User Manual for LoRaWAN End Nodes - LSN50v2-S31-
S31B LoRaWAN Temperature & Humidity Sensor User Manual
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Table of Contents:
•1. Introduction
•1.1 What is LSN50V2-S31 LoRaWAN Temperature & Humidity Sensor
•1.2 Specifications
•1.3 Features
•1.4 Applications
•1.5 Pin Definitions and Switch
•1.5.1 Pin Definition
•1.5.2 Jumper JP2
•1.5.3 BOOT MODE / SW1
•1.5.4 Reset Button
•1.5.5 LED
•1.5.6 Probe Dimension
•1.6 Hardware Variant
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User Manual for LoRaWAN End Nodes - LSN50v2-S31-
S31B LoRaWAN Temperature & Humidity Sensor User Manual
•2. How to use LSN50v2-S31?
•2.1 How it works
•2.2 Quick guide to connect to LoRaWAN server (OTAA)
•2.3 Uplink Payload
•2.3.1 Payload Analyze
•Battery:
•Temperature:
•Humidity:
•Alarm Flag& MOD:
•2.3.2 Payload Decoder file
•2.3.3 Historical Temperature and humidity of S31, FPORT=3（Since firmware 1.8.0）
•2.4Datalog Feature
•2.4.1 Unix TimeStamp
•2.4.2 Set Device Time
•2.4.3 Poll sensor value
•2.4.4 Clear Flash Record
•2.4.5 Set system time
•2.4.6 Set Time Sync Mode
•2.5 Temperature & HumidityAlarm Feature
•2.6 Configure LSN50v2-S31
•2.6.1 General Configure Commands
•2.6.2 Sensor related commands
•Set Temperature Alarm Threshold:
•Set Humidity Alarm Threshold:
•Set Alarm Interval:
•Poll the Alarm settings:
•2.7 LED Status
•2.8 Button Function
•2.9 Firmware Change Log
•3. Battery & Power Consumption
•4. Use AT Command
•4.1 Access AT Commands
•5. FAQ
•5.1 What is the frequency range of LSN50v2-S31?
•5.2 What is the Frequency Plan?
•5.3 How to update the firmware?
•6. Trouble Shooting
•6.1 AT Command input doesn't work
•6.2 Abnormal temperature
•7. Order Info
•8. Packing Info
•9. Support
1. Introduction
1.1 What is LSN50V2-S31 LoRaWAN Temperature & Humidity Sensor
The Dragino LSN50v2-S31 is a LoRaWAN Temperature and Humidity Sensorfor Internet of Things solution. It
is used to measure the surrounding environment temperature and relative air humidity precisely, and then
upload to IoT server via LoRaWAN wireless protocol.
The temperature & humidity sensor used in LSN50v2-S31 is SHT31, which is fully calibrated, linearized, and
temperature compensated digital output from Sensirion, it provides a strong reliability and long-term stability. The
SHT31 is fixed in a waterproof anti-condensation casingfor long term use.
LSN50v2-S31 supports temperature and humidity alarm feature, user can get alarm for instant notice.
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User Manual for LoRaWAN End Nodes - LSN50v2-S31-
S31B LoRaWAN Temperature & Humidity Sensor User Manual
LSN50v2-S31 is powered by8500mAh Li-SOCI2 battery, It is designed for long term use up to 10 years. (Real-
world battery life depends on the use environment, update period. Please check related Power Analyze report).
Each LSN50v2-S31 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
Micro Controller:
• MCU: STM32L072xxxx
• Flash:128KB
• RAM:20KB
• EEPROM: 6KB
• Clock Speed: 32Mhz
Common DC Characteristics:
• Supply Voltage: built in 8500mAh Li-SOCI2 battery
• Operating Temperature: -40 ~ 85°C
Temperature Sensor:
• Range: -40 to + 80°C
• Accuracy: ±0.2 @ 0-90 °C
• Resolution: 0.1°C
• Long Term Shift: <0.03 °C/yr
Humidity Sensor:
• Range: 0 ~ 99.9% RH
• Accuracy: ± 2%RH ( 0 ~ 100%RH)
• Resolution: 0.01% RH
• Long Term Shift: <0.25 %RH/yr
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
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User Manual for LoRaWAN End Nodes - LSN50v2-S31-
S31B LoRaWAN Temperature & Humidity Sensor User Manual
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
• External 3 meters SHT31 probe
• Measure range -55°C ~ 125°C
• Temperature & Humidity 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
• Industrial Monitoring and Control
• Long range Irrigation Systems.
1.5 Pin Definitions and Switch
The latest mother board for LSN50v2-S31 is :
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User Manual for LoRaWAN End Nodes - LSN50v2-S31-
S31B LoRaWAN Temperature & Humidity Sensor User Manual
1.5.1 Pin Definition
The device is pre-configured to connect to SHT31 sensor. The other pins are not used. If user want to know more
about other pins, please refer the user manual of LSn50v2 at:https://www.dropbox.com/sh/djkxs7mr17y94mi/
AABVlWbM9uzK9OA3mXyAT10Za?dl=0
1.5.2 Jumper JP2
Power on Device when put this jumper.
1.5.3 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
1.5.4 Reset Button
Press to reboot the device.
1.5.5 LED
It will flash:
1. When boot the device in flash mode
2. Send an uplink packet
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User Manual for LoRaWAN End Nodes - LSN50v2-S31-
S31B LoRaWAN Temperature & Humidity Sensor User Manual
1.5.6 Probe Dimension
1.6 Hardware Variant
Model Photo Description
LSN50v2-S31 External 3 meters SHT31 probe
LSN50v2 -S31B On device SHT31 Probe
2. How to use LSN50v2-S31?
2.1 How it works
The LSN50v2-S31 is working as LoRaWAN OTAA Class A end node. Each LSN50v2-S31 is shipped with a
worldwide unique set of OTAA and ABP keys. User needs to input the OTAA or ABP keys in the LoRaWAN network
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User Manual for LoRaWAN End Nodes - LSN50v2-S31-
S31B LoRaWAN Temperature & Humidity Sensor User Manual
server to register. Open the enclosure and power on the LSN50v2-S31, it will join the LoRaWAN network and start
to transmit data. The default period for each uplink is 20 minutes.
2.2 Quick guide to connect to LoRaWAN server (OTAA)
Here is an example for how to join the TTN LoRaWANServer. Below is the network structure, in this demo we use
DLOS8 as LoRaWAN gateway.
The DLOS8 is already set to connect to TTN. What the rest we need to is register the LSN50V2-S31 to TTN:
Step 1: Create a device in TTN with the OTAA keys from LSN50V2-S31.
Each LSN50V2-S31 is shipped with a sticker with the default device EUI as below:
You can enter this key in the LoRaWAN Server portal. Below is TTN screen shot:
Register the device：
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User Manual for LoRaWAN End Nodes - LSN50v2-S31-
S31B LoRaWAN Temperature & Humidity Sensor User Manual
Add APP EUI and DEV EUI：
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