Dragino LSN50v2-D20 User manual

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LSN50v2-D20-D22-D23 LoRaWAN Temperature Sensor Manual
Document Version: 2.0.a
Image Version: v1.7.2
Version
Description
Date
1.0
Release
2020-Nov-10
1.1
Add power on info and jumper info.
2021-Feb-5
2.0
Add LSN50v2-D22, D23 models
2021-Aug-22
2.0.a
Modify Temperature sensor decription
2022-Mar-15

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1. Introduction..............................................................................................................................4
1.1 What is LSN50V2-D20 LoRaWAN Temperature Sensor ..............................................................4
1.2 Specifications..............................................................................................................................5
1.3 Features......................................................................................................................................5
1.4 Applications................................................................................................................................5
1.5 Pin Definitions and Switch ..........................................................................................................7
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
1.6 Hardware Change log.................................................................................................................8
2. How to use LSN50v2-D20? ........................................................................................................9
2.1 How it works?.............................................................................................................................9
2.2 Quick guide to connect to LoRaWAN server (OTAA) ...................................................................9
2.3 Uplink Payload..........................................................................................................................12
2.3.1 Payload Analyze ..............................................................................................................12
2.3.2 Payload Decoder file.......................................................................................................13
2.4 Temperature Alarm Feature .....................................................................................................13
2.5 Configure LSN50v2-D20............................................................................................................14
2.5.1 General Configure Commands........................................................................................14
2.5.2 Sensor related commands: .............................................................................................14
2.6 LED Status.................................................................................................................................17
2.7 Button Function........................................................................................................................17
2.8 Firmware Change Log...............................................................................................................17
3. Battery Info................................................................................................. 错误!未定义书签。
4. Use AT Command....................................................................................................................21
4.1 Access AT Command.................................................................................................................21
5. FAQ.........................................................................................................................................22
5.1 What is the frequency range of LSN50v2-D20?........................................................................22
5.2 What is the Frequency Plan?....................................................................................................22

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5.3How to update the firmware? ..................................................................................................22
6. Order Info ...............................................................................................................................23
7. Packing Info ............................................................................................................................23
8. Support...................................................................................................................................23

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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.

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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
1.4 Applications

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✓Wireless Alarm and Security Systems
✓Home and Building Automation
✓Industrial Monitoring and Control
✓Long range Irrigation Systems.
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

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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

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2) Send an uplink packet
1.7 Hardware Change log
LSN50v2-D20 v1.0:
Release.

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2. How to use LSN50v2-D20?
2.1 How it works?
The LSN50v2-D20 is working as LoRaWAN OTAA Class A end node. Each LSN50v2-D20 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 server to register. Open the enclosure and power on the LSN50v2-D20, 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-D20 to TTN:
Step 1: Create a device in TTN with the OTAA keys from LSN50V2-D20.
Each LSN50V2-D20 is shipped with a sticker with the default device EUI as below:

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Input these keys in their LoRaWAN Server portal. Below is TTN screen shot:
Add APP EUI in the application
Add APP KEY and DEV EUI

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Step 2: Power on LSN50V2-D20
Step 3: LSN50V2-D20 will auto join to TTN network via the LoRaWAN coverage by DLOS8. After
join success, LSN50V2-D20 will start to uplink temperature value to server.

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2.3 Uplink Payload
2.3.1 Payload Analyze
Normal Upload Payload:
LSN50v2-D2x use the same payload as LSn50v2 mod1, as below.
改为 TTNV3
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.
Size(bytes)
2
2
2
1
2
2
Value
Battery
Temp Red
or Temp White
Ignore
Alarm Flag
Temp_White
Temp_Black

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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.
2.3.2 Payload Decoder file
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/
2.4 Temperature Alarm Feature
LSN50V2-D20 work flow with Alarm feature.

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User can use AT+18ALARM command to set the alarm low limit or high limit. Device will check
the temperature every minute, if the temperature lower than low limit or greater than high limit.
LSN50v2-D20 will send an Alarm packet base on Confirmed Uplink Mode to server.
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:
http://wiki.dragino.com/index.php?title=Main_Page#Use_Note_for_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:
http://wiki.dragino.com/index.php?title=End_Device_AT_Commands_and_Downlink_Commands
2.5.2 Sensor related commands:
Set Alarm Threshold:

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➢AT Command:
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)
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

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

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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
See this link.

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3. Battery & how to replace
3.1 Battery Type
LSN50V2-D2X is equipped with a 8500mAH ER26500 Li-SOCI2 battery. The battery is
un-rechargeable battery with low discharge rate targeting for 8~10 years use. This type of battery
is commonly used in IoT target for long-term running, such as water meter.
The discharge curve is not linear so can’t simply use percentage to show the battery level. Below
is the battery performance.
Minimum Working Voltage for the LSN50V2-D2X:
LSN50V2-D2X: 2.45v ~ 3.6v
3.2 Replace Battery
Any battery with range 2.45 ~ 3.6v can be a replacement. We recommend to use Li-SOCl2 Battery.
And make sure the positive and negative pins match.
3.3 Power Consumption Analyze
Dragino Battery powered product are all runs in Low Power mode. We have an update battery
calculator which base on the measurement of the real device. User can use this calculator to
check the battery life and calculate the battery life if want to use different transmit interval.

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Instruction to use as below:
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.
The battery related documents as below:
●Battery Dimension,
●Lithium-Thionyl Chloride Battery datasheet, Tech Spec
●Lithium-ion Battery-Capacitor datasheet, Tech Spec
3.3.1 Battery Note
The Li-SICO battery is designed for small current / long period application. It is not good to
use a high current, short period transmit method. The recommended minimum period for
use of this battery is 5 minutes. If you use a shorter period time to transmit LoRa, then the
battery life may be decreased.
JST-XH-2P
connector

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3.3.2 Replace the battery
You can change the battery in the LSN50V2-D2X.The type of battery is not limited as long as
the output is between 3v to 3.6v. On the main board, there is a diode (D1) between the
battery and the main circuit. If you need to use a battery with less than 3.3v, please remove
the D1 and shortcut the two pads of it so there won’t be voltage drop between battery and
main board.
The default battery pack of LSN50V2-D2X includes a ER26500 plus super capacitor. If user
can’t find this pack locally, they can find ER26500 or equivalence, which will also work in
most case. The SPC can enlarge the battery life for high frequency use (update period below
5 minutes)