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.
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 |  | |
LSN50v2 D23 |  |
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:
- When boot the device in flash mode
- 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
The LSN50v2-D2x is working as LoRaWAN OTAA Class A end node. Each LSN50v2-D2x 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-D2x, 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:
You can enter this key in the LoRaWAN Server portal. Below is TTN screen shot:
Register the device：
Add APP EUI and DEV EUI：
Add APP EUI in the application：
Add APP KEY
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.
2.3 Uplink Payload
Normal Upload Payload:
LSN50v2-D2x use the same payload as LSn50v2 mod1, as below.
Size (bytes) | 2 | 2 | 2 | 1 | 2 | 2 |
|---|---|---|---|---|---|---|
| Value | ignore |
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.
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/
2.5 Temperature Alarm Feature
LSN50V2-D20 work flow with Alarm feature.
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.
2.6 Show Data in DataCake IoT Server
DATACAKE provides a human friendly interface to show the sensor data, once we have data in TTN, we can use DATACAKE to connect to TTN and see the data in DATACAKE. Below are the steps:
Step 1: Be sure that your device is programmed and properly connected to the network at this time.
Step 2: To configure the Application to forward data to DATACAKE you will need to add integration. To add the DATACAKE integration, perform the following steps:
Step 3: Create an account or log in Datacake.
Step 4: Create LDDS04 product.
Step 5: add payload decode
After added, the sensor data arrive TTN, it will also arrive and show in Datacake.
2.7 Frequency Plans
The LDDS45 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.
2.7.1 EU863-870 (EU868)
Uplink:
868.1 - SF7BW125 to SF12BW125
868.3 - SF7BW125 to SF12BW125 and SF7BW250
868.5 - SF7BW125 to SF12BW125
867.1 - SF7BW125 to SF12BW125
867.3 - SF7BW125 to SF12BW125
867.5 - SF7BW125 to SF12BW125
867.7 - SF7BW125 to SF12BW125
867.9 - SF7BW125 to SF12BW125
868.8 - FSK
Downlink:
Uplink channels 1-9 (RX1)
869.525 - SF9BW125 (RX2 downlink only)
2.7.2 US902-928(US915)
Used in USA, Canada, and South America. Frequency band as per definition in LoRaWAN 1.0.3 Regional document.
To make sure the end node supports all sub band by default. In the OTAA Join process, the end node will use frequency 1 from sub-band1, then frequency 1 from sub-band2, then frequency 1 from sub-band3, etc to process the OTAA join.
After Join success, the end node will switch to the correct sub band by:
Check what sub-band the LoRaWAN server ask from the OTAA Join Accept message and switch to that sub-band
Use the Join successful sub-band if the server doesn’t include sub-band info in the OTAA Join Accept message ( TTN v2 doesn't include)
2.7.3 CN470-510 (CN470)
Used in China, Default use CHE=1
Uplink:
486.3 - SF7BW125 to SF12BW125
486.5 - SF7BW125 to SF12BW125
486.7 - SF7BW125 to SF12BW125
486.9 - SF7BW125 to SF12BW125
487.1 - SF7BW125 to SF12BW125
487.3 - SF7BW125 to SF12BW125
487.5 - SF7BW125 to SF12BW125
487.7 - SF7BW125 to SF12BW125
Downlink:
506.7 - SF7BW125 to SF12BW125
506.9 - SF7BW125 to SF12BW125
507.1 - SF7BW125 to SF12BW125
507.3 - SF7BW125 to SF12BW125
507.5 - SF7BW125 to SF12BW125
507.7 - SF7BW125 to SF12BW125
507.9 - SF7BW125 to SF12BW125
508.1 - SF7BW125 to SF12BW125
505.3 - SF12BW125 (RX2 downlink only)
2.7.4 AU915-928(AU915)
Frequency band as per definition in LoRaWAN 1.0.3 Regional document.
To make sure the end node supports all sub band by default. In the OTAA Join process, the end node will use frequency 1 from sub-band1, then frequency 1 from sub-band2, then frequency 1 from sub-band3, etc to process the OTAA join.
After Join success, the end node will switch to the correct sub band by:
Check what sub-band the LoRaWAN server ask from the OTAA Join Accept message and switch to that sub-band
Use the Join successful sub-band if the server doesn’t include sub-band info in the OTAA Join Accept message ( TTN v2 doesn't include)
2.7.5 AS920-923 & AS923-925 (AS923)
Default Uplink channel:
923.2 - SF7BW125 to SF10BW125
923.4 - SF7BW125 to SF10BW125
Additional Uplink Channel:
(OTAA mode, channel added by JoinAccept message)
AS920~AS923 for Japan, Malaysia, Singapore:
922.2 - SF7BW125 to SF10BW125
922.4 - SF7BW125 to SF10BW125
922.6 - SF7BW125 to SF10BW125
922.8 - SF7BW125 to SF10BW125
923.0 - SF7BW125 to SF10BW125
922.0 - SF7BW125 to SF10BW125
AS923 ~ AS925 for Brunei, Cambodia, Hong Kong, Indonesia, Laos, Taiwan, Thailand, Vietnam:
923.6 - SF7BW125 to SF10BW125
923.8 - SF7BW125 to SF10BW125
924.0 - SF7BW125 to SF10BW125
924.2 - SF7BW125 to SF10BW125
924.4 - SF7BW125 to SF10BW125
924.6 - SF7BW125 to SF10BW125
Downlink:
Uplink channels 1-8 (RX1)
923.2 - SF10BW125 (RX2)
2.7.6 KR920-923 (KR920)
Default channel:
922.1 - SF7BW125 to SF12BW125
922.3 - SF7BW125 to SF12BW125
922.5 - SF7BW125 to SF12BW125
Uplink: (OTAA mode, channel added by JoinAccept message)
922.1 - SF7BW125 to SF12BW125
922.3 - SF7BW125 to SF12BW125
922.5 - SF7BW125 to SF12BW125
922.7 - SF7BW125 to SF12BW125
922.9 - SF7BW125 to SF12BW125
923.1 - SF7BW125 to SF12BW125
923.3 - SF7BW125 to SF12BW125
Downlink:
Uplink channels 1-7(RX1)
921.9 - SF12BW125 (RX2 downlink only; SF12BW125 might be changed to SF9BW125)
2.7.7 IN865-867 (IN865)
Uplink:
865.0625 - SF7BW125 to SF12BW125
865.4025 - SF7BW125 to SF12BW125
865.9850 - SF7BW125 to SF12BW125
Downlink:
Uplink channels 1-3 (RX1)
866.550 - SF10BW125 (RX2)
2.8 LED Indicator
The LDDS04 has an internal LED which is used to show the status of different state.
- After LDDS04 is turned on, if the 4 channels converter is detected, the LED will flash 4 times quickly.
- Blink once when device transmit a packet.
- Solid ON for Five Seconds when OTAA Join Successfully.
2.9 Firmware Change Log
Firmware download link: http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LDDS04/Firmware/
Firmware Upgrade Method: Firmware Upgrade Instruction
3. Configure LDDS04 via AT Command or LoRaWAN Downlink
Use can configure LDDS04 via AT Command or LoRaWAN Downlink.
AT Command Connection: See FAQ.
LoRaWAN Downlink instruction for different platforms: IoT LoRaWAN Server
There are two kinds of commands to configure LDDS04, they are:
General Commands.
These commands are to configure:
General system settings like: uplink interval.
LoRaWAN protocol & radio related command.
They are same for all Dragino Device which support DLWS-005 LoRaWAN Stack. These commands can be found on the wiki: End Device AT Commands and Downlink Command
Commands special design for LDDS04
These commands only valid for LDDS04, as below:
3.1 Set Transmit Interval Time
Feature: Change LoRaWAN End Node Transmit Interval.
AT Command: AT+TDC
Downlink Command: 0x01
Format: Command Code (0x01) followed by 3 bytes time value.
If the downlink payload=0100003C, it means set the END Node's Transmit Interval to 0x00003C=60(S), while type code is 01.
- Example 1: Downlink Payload: 0100001E // Set Transmit Interval (TDC) = 30 seconds
- Example 2: Downlink Payload: 0100003C // Set Transmit Interval (TDC) = 60 seconds
3.2 Set Interrupt Mode
Feature, Set Interrupt mode for GPIO_EXIT.
Downlink Command: AT+INTMOD
Downlink Command: 0x06
Format: Command Code (0x06) followed by 3 bytes.
This means that the interrupt mode of the end node is set to 0x000003=3 (rising edge trigger), and the type code is 06.
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
- 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:
Size(bytes) | 1 | 1 | 1 | 2 | 1 | 4 | 1 |
|---|---|---|---|---|---|---|---|
| Value | Software Type | Frequency Band | Sub-band | Firmware Version | Sensor Type | Reserve | Message Type |
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
LDDS04 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 LDDS04:
LDDS04: 2.45v ~ 3.6v
4.2 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.
4.3 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.
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:
4.3.1 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.
4.3.2 Replace the battery
You can change the battery in the LSPH01.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 LSPH01 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).
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.
Connection:
USB TTL GND <----> GND
USB TTL TXD <----> UART_RXD
USB TTL RXD <----> UART_TXD
In the PC, you need to set the serial baud rate to 9600 to access the serial console for LDDS04.
LDDS04 will output system info once power on as below:
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.