Table of Contents:

• 1.  Introduction
  • 1.1 ​ What is LPT01 LoRaWAN Temperature Transmitter
  • ​1.2  Features
  • 1.3  Specification
  • 1.4 ​ Applications
  • 1.5  Sleep mode and working mode
  • 1.6  Button & LEDs
  • 2.1  How it works?
  • 2.2  ​Quick guide to connect to LoRaWAN server (OTAA)
  • 2.3  ​Working Mode & Uplink Payload
    • 2.3.1  Device Status, FPORT=5
    • 2.3.2  General acquisition mode & Continuous Uplink mode, FPORT=2
      • Battery
      • Unix TimeStamp
      • Unit&sampling _times
      • temperature(PT100)
    • 2.3.3  Continuous Uplink mode
  • 2.4  Unix TimeStamp
    • 2.4.1  Set Device Time
• 3.  Configure LPT01 via AT Command or LoRaWAN Downlink
  • 3.1  Set Transmit Interval Time
  • 3.2  Set Continuous uplink mode
  • 3.3 Set time synchronization method
  • 3.4 Set time synchronization interval
  • 3.5 Temperature Unit
  • 3.6 Button response time
• 4.  Battery & Power Consumption
• 5.  OTA Firmware update
• 6.  FAQ
• 7.  Trouble Shooting
• 8.  Order Info
• 9. ​ Packing Info
• 10.  ​Support

1.  Introduction

1.1 ​ What is LPT01 LoRaWAN Temperature Transmitter

The Dragino LPT01 Food Grade LoRaWAN Temperature Transmitter is designed to monitor the temperature of different food environments. It supports reading PT100 probes and converting the value to temperature and uploading it to an IoT server via LoRaWAN protocol.

LPT01 supports Datalog feature. User can retrieve the sensor value via LoRaWAN downlink command.

LPT01 supports wireless OTA update which make user easy to use.

LPT01 is powered by CR123A non-rechargeable battery and target for long time use, these batteries can provide about 16,000 ~ 70,000 uplink packets, which result in 2 ~ 10 years battery life. After battery running out, user can easily open the enclosure and replace with CR123A batteries.

Each LPT01 is pre-load with a set of unique keys for LoRaWAN registrations, register these keys to local LoRaWAN server and it will auto-connect after power on.

​1.2  Features

• LoRaWAN v1.0.3 Class A
• Support 3 -wire PT-100
• Temperature alarm
• Datalog Feature
• LCD displays the device status
• Support  LoRaWAN remote configure
• Support wireless OTA update firmware
• Uplink on periodically
• Downlink to change configure
• CR123A 1500mAh Battery

1.3  Specification

Common DC Characteristics:

• Supply Voltage: Built-in Battery , 2.5v ~ 3.0v
• Operating Temperature: -40 ~ 85°C

LoRa Spec:

• Frequency Range,  Band 1 (HF): 862 ~ 1020 Mhz
• Max +22 dBm constant RF output vs.
• RX sensitivity: down to -139 dBm.
• Excellent blocking immunity

Battery:

• CR123A non-rechargeable battery
• Capacity: 1500mAh
• Self-Discharge: <1% / Year @ 25°C
• Max continuously current: 130mA
• Max boost current: 2A, 1 second

Power Consumption

• Sleep Mode: 5uA @ 3.3v
• LoRa Transmit Mode: 125mA @ 20dBm, 82mA @ 14dBm

1.4 ​ Applications

• Logistics and Supply Chain Management
• Food management
• Cold chains solution
• Industrial Monitoring and Control

1.5  Sleep mode and working mode

Deep Sleep Mode: Sensor doesn't have any LoRaWAN activate. This mode is used for storage and shipping to save battery life.

Working Mode: In this mode, Sensor will work as LoRaWAN Sensor to Join LoRaWAN network and send out sensor data to server. Between each sampling/tx/rx periodically, sensor will be in IDLE mode), in IDLE mode, sensor has the same power consumption as Deep Sleep mode.

1.6  Button & LEDs

Reset Behavior	Function	Action
Three buttons×5	Reset Device	Reset the device, the signal on the LCD screen will keep flashing until the join is successful
Behavior on STOP	Function	Action
>2s	Exit Function	Exit Continuous reporting function, LCD display will output “OFF”.
×3	Deactivate Device	Entering deep sleep mode, the LCD display will output “SLP”.
Behavior on ℃/℉	Function	Action
>3s	Change Display	Switch display units and convert temperature values, and set them as default
Behavior on HOLD	Function	Action
×1	Send an uplink	If sensor is already Joined to LoRaWAN network, sensor will send an uplink packet, LCD screen displays the current temperature once.
>3s	Continuous uplinks	After entering this function, the "→" icon on the LCD screen will continue to flash. In the continuous upload mode, the temperature value on the LCD screen will continue to change. Click the "HOLD" button, and the temperature value on the LCD screen will be locked at the current value. Click the "HOLD" button again, and the temperature on the LCD screen will resume to change continuously.

2.1  How it works?

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

Following is an example for how to join the TTN v3 LoRaWAN Network. Below is the network structure; we use the LPS8v2  as a LoRaWAN gateway in this example. 

The LPS8V2 is already set to connected to TTN network , so what we need to now is configure the TTN server.

Step 1: Create a device in TTN with the OTAA keys from LPT01.

Each LPT01 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:

Create the application.

Add devices to the created Application.

Enter end device specifics manually.

Add DevEUI and AppKey.

Customize a platform ID for the device.

Step 2: Add decoder

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

Click this link to get the decoder: https://github.com/dragino/dragino-end-node-decoder/tree/main/

Below is TTN screen shot:

Step 3: Activate on LPT01

Press the button for 5 seconds to activate the LPT01.

Green led will fast blink 5 times, device will enter OTA mode for 3 seconds. And then start to JOIN LoRaWAN network. Green led will solidly turn on for 5 seconds after joined in network.

After join success, it will start to upload messages to TTN and you can see the messages in the panel.

2.3  ​Working Mode & Uplink Payload

2.3.1  Device Status, FPORT=5

Users can use the downlink command(0x26 01) to ask LP01 to send device configure detail, include device configure status. LPT01 will uplink a payload via FPort=5 to server.

The Payload format is as below.

Example in TTN: 

Sensor Model: For LPT01, this value is 0x35

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

Frequency Band:

0x01: EU868

0x02: US915

0x03: IN865

0x04: AU915

0x05: KZ865

0x06: RU864

0x07: AS923

0x08: AS923-1

0x09: AS923-2

0x0a: AS923-3

0x0b: CN470

0x0c: EU433

0x0d: KR920

0x0e: MA869

Sub-Band:

AU915 and US915:value 0x00 ~ 0x08

CN470: value 0x0B ~ 0x0C

Other Bands: Always 0x00

Battery Info:

Check the battery voltage.

Ex1: 0x0B97 = 2967mV

Ex2: 0x0B49 = 2889mV

2.3.2  General acquisition mode & Continuous Uplink mode, FPORT=2

AT+WMOD=1,10,6,10,0,0 is the default mode. End Node will uplink the real-time current sensor value in two case:

• Each TDC Interval.
• Trigger continuous uplink mode according to AT+WMOD configuration.

Below is the uplink payload which shows.

Example in TTN: 

Example:

If payload is: 09DDH:  (09DD & 8000 == 0), temp = 09DDH /100 = 25..25 degree

If payload is: FF3FH :  (FF3F & 8000 == 1) , temp = (FF3FH - 65536)/10 = -19.3 degrees.

(FF3F & 8000：Judge whether the highest bit is 1, when the highest bit is 1, it is negative)

If the value is -327.6, it means the PT100 probe is not connected.

​

2.3.3  Continuous Uplink mode

In Continuous Sampling Mode(AT+WMOD=a,b,c,d,e,f), LPT01 will record the current sensor data at a fix interval, and report multiply group of data together to IoT server later.

AT+WMOD=a,b,c,d,e,f format:

• a : Setting LPT01 Turns Continuous Sampling Mode On or Off.(1: ON, 0:OFF)
• b : Set Sampling Interval, Unit: Second.(Range: 0~255)
• c :  Define how many group of data will be uplink together. (max: 100)
• d : Duration of operation in continuous acquisition mode.(Range: 0~255)
• e : Set the temperature lower limit value, below the lower limit value will exit the alarm.
• f :  Set the upper temperature limit value, above the upper limit value will trigger an alarm.

When LPT01 is in Continuous Sampling Mode, the TDC time setting is disabled, and LPT01 will send uplink once it finished the number of sampling define in "b".

Example Command: AT+WMOD=1,5,5,5,0,10

When the measured temperature is outside the set range of 0℃~10℃, the continuous measurement mode will be activated, the duration is 5min, the sampling interval is 5s once, a total of 5 times of collection, and the integrated data will be reported once, So the payload for each uplink will include:

• Battery (2 bytes)
• + Group1 Sensor Value (2 Bytes): the last 4th reading for Temp
• + Group2 Sensor Value (2 Bytes): the last 3rd reading for Temp
• + Group3 Sensor Value (2 Bytes): the last 2nd reading for Temp
• + Group4 Sensor Value (2 Bytes): the last reading for Temp
• + Group5 Sensor Value (2 Bytes): reading for Temp

So totally 12 bytes payload in this example.

Notice: Continuous sampling mode may result in a longer payload. the LPT01 will automatically select the appropriate DR uplink data. This may shorten the transmission distance.

Uplink packets use FPORT=2.

Example parse in TTNv3.

​​​

2.4  Unix TimeStamp

LPT01 uses Unix TimeStamp format based on

Users can get this time from the link:  https://www.epochconverter.com/ :

Below is the converter example

2.4.1  Set Device Time

3.  Configure LPT01 via AT Command or LoRaWAN Downlink

• AT Command Connection: See FAQ.

• LoRaWAN Downlink instruction for different platforms: IoT LoRaWAN Server

• General system settings like: uplink interval.

• LoRaWAN protocol & radio related command.

​

3.1  Set Transmit Interval Time

Feature: Change LoRaWAN End Node Transmit Interval.

AT Command: AT+TDC

3.2  Set Continuous uplink mode

Feature: Get or set uplink behaviour in continuous uplink mode.

AT Command: AT+WMOD

Downlink Command: 0xA2

• Downlink payload: 0xA2010505050000000A         // Same as AT+WMOD=1,5,5,5,0,10
• Downlink payload: 0xA20105050500000000         // Same as AT+WMOD=1,5,5,5,0,0

Note: If you need to enter the continuous uplink mode immediately, you can control it by going downlink.

• Downlink payload: 0xA5 01 //  After receiving the downlink, LPT01 will enter the continuous uplink mode, but if it detects that the current sampled temperature is lower than the set minimum threshold, it will automatically exit the continuous uplink mode。
• Downlink payload: 0xA4 01 //  After receiving the downlink, LPT01 will directly exit the continuous uplink mode.

3.3 Set time synchronization method

Feature: This command is used to enable automatic time calibration by time zone(Get or Set time synchronization method).

AT Command: AT+SYNCMOD

Downlink Command: 0x28

Format: Command Code (0x28) followed by 2 bytes.

• Example 1: Downlink Payload: 28 00 00       //  Turn off the time zone calibration time.
• Example 2: Downlink Payload: 28 01 FA      //   Turn on time zone calibration time, UTC-6
• Example 3: Downlink Payload: 28 01 06      //   Turn on time zone calibration time, UTC+6

Note: UTC-6: 256+(-6)=250(D)=0xFA(H)

3.4 Set time synchronization interval

Feature: Get or set time synchronization interval in day or hour.

AT Command: AT+SYNCTDC

Downlink Command: 0x29

Format: Command Code (0x29) followed by 3 bytes.

• Example 1: Downlink Payload: 29  0C 00     //  Calibrate once every 12 days
• Example 2: Downlink Payload: 29  0C 01     //  Calibrate once every 12 hours

3.5 Temperature Unit

Feature: Get or set Temperature Unit.

AT Command: AT+UNIT

Note: In US915 Band, Default unit is ℉, In other bands, default unit is ℃.

Downlink Command: 0xA1

Format: Command Code (0xA1) followed by 1 bytes.

• Example 1: Downlink Payload: A1 00     //  Same as AT+UNIT=0
• Example 2: Downlink Payload: A1 01     //  Same as AT+UNIT=1

3.6 Button response time

Feature: Get or set the response time for the hold button.

AT Command: AT+HOLDT

Note:By default, if the device is in idle mode, pressing and holding the HOLD button for 50 milliseconds to 2000 milliseconds will cause the device to send the temperature to the server..

Downlink Command: 0xA3

Format: Command Code (0xA3) followed by 4 bytes.

• Example 1: Downlink Payload: A3 00 32 07 D0     //  Same as AT+HOLDT=50,2000
• Example 2: Downlink Payload: A3 00 C8 07 D0     //  Same as AT+HOLDT=200,2000

4.  Battery & Power Consumption

LPT01 uses CR123A battery pack. See below link for detail information about the battery info and how to replace.

Battery Info & Power Consumption Analyze .

5.  OTA Firmware update

User can change firmware LPT01 to:

• Change Frequency band/ region.
• Update with new features.
• Fix bugs. 

6.  FAQ

7.  Trouble Shooting

8.  Order Info

Part Number : LPT01-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

9. ​ Packing Info

Package Includes:

• LPT01 LoRaWAN Temperature Collector 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.