Table of Contents :

• 1. Introduction
  • 1.1 What is SW3L-LB/LS LoRaWAN Flow Sensor
  • 1.2 ​Features
  • 1.3 Specification
  • 1.4 Applications
  • 1.5 Sleep mode and working mode
  • 1.6 Button & LEDs
  • 1.7 BLE connection
  • 1.8 Pin Definitions
  • 1.9 Flow Sensor Spec
  • 1.10 Mechanical
    • 1.10.1 for LB version
    • 1.10.2 for LS version
• 2. Configure SW3L-LB/LS to connect to LoRaWAN network
  • 2.1 How it works
  • 2.2 ​Quick guide to connect to LoRaWAN server (OTAA)
  • 2.3 ​Uplink Payload
    • 2.3.1 Device Status, FPORT=5
    • 2.3.2 Sensor Configuration, FPORT=4
    • 2.3.3 Water Flow Value, Uplink FPORT=2
    • 2.3.4 Historical Water Flow Status, FPORT=3
  • 2.4 Payload Decoder file
  • 2.5 Datalog Feature
    • 2.5.1 Ways to get datalog via LoRaWAN
    • 2.5.2 Unix TimeStamp
    • 2.5.3 Set Device Time
    • 2.5.4 Poll sensor value
  • 2.6 Frequency Plans
• 3. Configure SW3L-LB/LS
  • 3.1 Configure Methods
  • 3.2 General Commands
  • 3.3 Commands special design for SW3L-LB/LS
    • 3.3.1 Set Transmit Interval Time
    • 3.3.2 Set Power Output Duration
    • 3.3.3 Set Time Sync Mode
    • 3.3.4 Alarm for continuously water flow
    • 3.3.5 Set the calculate flag
    • 3.3.6 Set count number
    • 3.3.7 Set work mode
    • 3.3.8 Clear Flash Record
• 4. Battery & Power Consumption
• 5. OTA Firmware update
• 6. FAQ
  • 6.1  AT Commands input doesn't work
  • 6.2 Can I connect 3rd party flow sensor other than the default one?
• 7. Order Info
• 8. ​Packing Info
• 9. Support

1. Introduction

1.1 What is SW3L-LB/LS LoRaWAN Flow Sensor

The Dragino SW3L-LB/LS is a LoRaWAN Flow Sensor. It detects water flow volume and uplink to IoT server via LoRaWAN network. User can use this to monitor the water usage for buildings.

The SW3L-LB/LS will send water flow volume every 20 minutes. It can also detect the water flow status and send Alarm, to avoid the waste for water usage such as broken toilet case.

SW3L-LB/LS is designed for both indoor and outdoor use. It has a weatherproof enclosure and industrial level battery to work in low to high temperatures.

The LoRa wireless technology used in SW3L-LB/LS allows device to send data and reach extremely long ranges at low data-rates. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption.

SW3L-LB/LS supports BLE configure and wireless OTA update which make user easy to use.

SW3L-LB/LS is powered by 8500mAh Li-SOCI2 battery or solar powered + Li-ion battery, it is designed for long term use up to 5 years.

Each SW3L-LB/LS 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 1.0.3 Class A
• Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/IN865
• Ultra-low power consumption
• Upload water flow volume
• Monitor water waste
• AT Commands to change parameters
• supports Datalog feature
• Support Bluetooth v5.1 and LoRaWAN remote configure
• Support wireless OTA update firmware
• Uplink on periodically and open/close event
• Downlink to change configure
• 8500mAh Li/SOCl2 Battery (SW3L-LB)
• Solar panel + 3000mAh Li-ion battery (SW3L-LS)

1.3 Specification

Common DC Characteristics:

• Supply Voltage: Built-in Battery , 2.5v ~ 3.6v
• 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:

• Li/SOCI2 un-chargeable battery
• Capacity: 8500mAh
• 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

• Flow Sensor application
• Water Control
• Toilet Flow Sensor
• Monitor Waste water

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

1.7 BLE connection

SW3L-LB/LS support BLE remote configure.

BLE can be used to configure the parameter of sensor or see the console output from sensor. BLE will be only activate on below case:

• Press button to send an uplink
• Press button to active device.
• Device Power on or reset.

If there is no activity connection on BLE in 60 seconds, sensor will shut down BLE module to enter low power mode.

1.8 Pin Definitions

1.9 Flow Sensor Spec

Notice: SW3L-002-FE model is none off-shore model, only valid with MOQ of 200pcs ordering. 

1.10 Mechanical

1.10.1 for LB version

002-FE:  diameter: G1/4” / DN10.  1377 pulse = 1 L

004: DW-004 Flow Sensor: diameter: G1/2” / DN15.  450 pulse = 1 L

006: DW-006 Flow Sensor: diameter: G3/4” / DN20.  390 pulse = 1 L

010: DW-010 Flow Sensor: diameter: G 1” / DN25.   64 pulse = 1 L

020: DW-020 Flow Sensor: diameter: G 2”/ DN50.  12 pulse = 1 L

1.10.2 for LS version

2. Configure SW3L-LB/LS to connect to LoRaWAN network

2.1 How it works

The SW3L-LB/LS is configured as LoRaWAN OTAA Class A mode by default. It has OTAA keys to join LoRaWAN network. To connect a local LoRaWAN network, you need to input the OTAA keys in the LoRaWAN IoT server and press the button to activate the SW3L-LB/LS. It will automatically join the network via OTAA and start to send the sensor value. The default uplink interval is 20 minutes.

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 SW3L-LB/LS.

Each SW3L-LB/LS 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: Activate on SW3L-LB/LS

Press the button for 5 seconds to activate the SW3L-LB/LS.

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 ​Uplink Payload

2.3.1 Device Status, FPORT=5

Include device configure status. Once SW3L-LB/LS Joined the network, it will uplink this message to the server. After that, SW3L-LB/LS will uplink Device Status every 12 hours.

Users can also use the downlink command(0x26 01) to ask SW3L-LB/LS to resend this uplink. This uplink payload also includes the DeviceTimeReq to get time.

The Payload format is as below.

Example parse in TTNv3

Sensor Model: For SW3L-LB/LS, this value is 0x1F

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: 0x0B45 = 2885mV

Ex2: 0x0B49 = 2889mV

2.3.2 Sensor Configuration, FPORT=4

SW3L-LB/LS will only send this command after getting the downlink command (0x26 02) from the server.

Example parse in TTNv3

• TDC: (default: 0x0004B0)

Uplink interval for the total pulse count, default value is 0x0004B0 which is 1200 seconds = 20 minutes.

• STOP Duration & Alarm Timer

Shows the configure value of Alarm for continuously water flow

2.3.3 Water Flow Value, Uplink FPORT=2

Calculate Flag & Alarm:

MOD & PA4_status & PB15_status:

• Calculate Flag

• calculate flag=0: for SW3L-004 Flow Sensor: 450 pulse = 1 L

• calculate flag=1: for SW3L-006 Flow Sensor: 390 pulse = 1 L

• calculate flag=2: for SW3L-010 Flow Sensor: 64 pulse = 1 L

•  for SW3L-020 Flow Sensor: 12 pulse = 1 L  Please use the following decoder:dragino-end-node-decoder/SW3L-LB/SW3L-LB_-020_TTN_Decoder.txt at main · dragino/dragino-end-node-decoder · GitHub

• Alarm

• Total pulse

• Last Pulse

• MOD: Default =0

• Water Flow Value

2.3.4 Historical Water Flow Status, FPORT=3

• Each data entry is 11 bytes and has the same structure as real time water flow status, to save airtime and battery, SW3L will send max bytes according to the current DR and Frequency bands.

2.4 Payload Decoder file

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

In the page Applications --> Payload Formats --> Custom --> decoder to add the decoder from: dragino-end-node-decoder/SW3L-LB at main · dragino/dragino-end-node-decoder · GitHub

2.5 Datalog Feature

Datalog Feature is to ensure IoT Server can get all sampling data from Sensor even if the LoRaWAN network is down. For each sampling, SW3L-LB/LS will store the reading for future retrieving purposes.

Note: After the device is reset, in cumulative counting mode,the last stored count value will be read as the initial value.

2.5.1 Ways to get datalog via LoRaWAN

Set PNACKMD=1, SW3L-LB/LS will wait for ACK for every uplink, when there is no LoRaWAN network, SW3L-LB/LS will mark these records with non-ack messages and store the sensor data, and it will send all messages (10s interval) after the network recovery.

• a) SW3L-LB/LS will do an ACK check for data records sending to make sure every data arrive server.

• b) SW3L-LB/LS will send data in CONFIRMED Mode when PNACKMD=1, but SW3L-LB/LS won't re-transmit the packet if it doesn't get ACK, it will just mark it as a NONE-ACK message. In a future uplink if SW3L-LB/LS gets a ACK, SW3L-LB/LS will consider there is a network connection and resend all NONE-ACK messages. 

Below is the typical case for the auto-update datalog feature (Set PNACKMD=1)

2.5.2 Unix TimeStamp

SW3L-LB/LS uses Unix TimeStamp format based on

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

Below is the converter example

So, we can use AT+TIMESTAMP=1611889405 or downlink 3060137afd00 to set the current time 2021 – Jan -- 29 Friday 03:03:25

2.5.3 Set Device Time

User need to set SYNCMOD=1 to enable sync time via MAC command.

Once SW3L-LB/LS Joined LoRaWAN network, it will send the MAC command (DeviceTimeReq) and the server will reply with (DeviceTimeAns) to send the current time to SW3L-LB/LS. If SW3L-LB/LS fails to get the time from the server, SW3L-LB/LS will use the internal time and wait for next time request (AT+SYNCTDC to set the time request period, default is 10 days).

Note: LoRaWAN Server need to support LoRaWAN v1.0.3(MAC v1.0.3) or higher to support this MAC command feature, Chirpstack,TTN V3 v3 and loriot support but TTN V3 v2 doesn't support. If server doesn't support this command, it will through away uplink packet with this command, so user will lose the packet with time request for TTN V3 v2 if SYNCMOD=1.

2.5.4 Poll sensor value

Users can poll sensor values based on timestamps. Below is the downlink command.

2.6 Frequency Plans

The SW3L-LB/LS uses OTAA mode and below frequency plans by default. Each frequency band use different firmware, user update the firmware to the corresponding band for their country.

http://wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20Frequency%20Band/

3. Configure SW3L-LB/LS

3.1 Configure Methods

SW3L-LB/LS supports below configure method:

• AT Command via Bluetooth Connection (Recommended): BLE Configure Instruction.

• AT Command via UART Connection : See UART Connection.

• LoRaWAN Downlink.  Instruction for different platforms: See IoT LoRaWAN Server section.

3.2 General Commands

These commands are to configure:

• General system settings like: uplink interval.

• LoRaWAN protocol & radio related command.

They are same for all Dragino Devices which support DLWS-005 LoRaWAN Stack. These commands can be found on the wiki:

http://wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20AT%20Commands%20and%20Downlink%20Command/

3.3 Commands special design for SW3L-LB/LS

These commands only valid for SW3L-LB/LS, as below:

3.3.1 Set Transmit Interval Time

• Example 1: Downlink Payload: 0100001E       // Set Transmit Interval (TDC) = 30 seconds

• Example 2: Downlink Payload: 0100003C      // Set Transmit Interval (TDC) = 60 seconds 

   

3.3.2 Set Power Output Duration

Control the output duration 5V . Before each sampling, device will

1. first enable the power output to external sensor,

2. keep it on as per duration, read sensor value and construct uplink payload

3. final, close the power output.

AT Command:AT+5VT

Downlink Command:0x07

Format: Command Code (0x07) followed by 2 bytes.

The first and second bytes are the time to turn on.

• Example 1: Downlink Payload: 070000     --->   AT+5VT=0
• Example 2: Downlink Payload: 0701F4      --->  AT+5VT=500

3.3.3 Set Time Sync Mode

Feature: Enable/Disable Sync system time via LoRaWAN MAC Command (DeviceTimeReq), LoRaWAN server must support v1.0.3 protocol to reply to this command.

SYNCMOD is set to 1 by default. If user wants to set a different time from the LoRaWAN server, the user needs to set this to 0.

AT Command:

Downlink Command:

0x28 01           // Same As AT+SYNCMOD=1

0x28 01 08      // Same As AT+SYNCMOD=1,8

0x28 01 F4      // Same As AT+SYNCMOD=1,-12

0x28 00           // Same As AT+SYNCMOD=0

3.3.4 Alarm for continuously water flow

• Stop Duration: Unit: Second

• Alarm Timer: Units: Minute; Default 0 minutes (means Alarm disable)

• AT+PTRIG=15,3   --> Set Stop duration: 15s, Alarm Timer: 3 minutes. 

• AT+ PTRIG=15,0  --> Default Value, disable water waste Alarm.

3.3.5 Set the calculate flag

Feature: Set the calculate flag

AT Command: AT+CALCFLAG

Downlink Command:

• Example: 0XA501         //  Same as AT+CALCFLAG =1

3.3.6 Set count number

Feature: Manually set the count number

AT Command: AT+SETCNT

Downlink Command: 0xA6

Format: Command Code (0xA6) followed by 4 bytes.

• Example: 0xA600000001      //  Same as AT+ SETCNT =1

• Example: 0xA600000064      //  Same as AT+ SETCNT =100

3.3.7 Set work mode

Feature: Manually set the work mode

AT Command: AT+MOD

Downlink Command:

• Example: 0x0A00       //  Same as AT+MOD=0

• Example: 0x0A01       //  Same as AT+MOD=1

3.3.8 Clear Flash Record

Feature: Clear flash storage for data log feature.

AT Command: AT+CLRDTA

4. Battery & Power Consumption

SW3L-LB use ER26500 + SPC1520 battery pack and SW3L-LS use 3000mAh Recharable Battery with Solar Panel. 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 SW3L-LB/LS to:

• Change Frequency band/ region.

• Update with new features.

• Fix bugs. 

Firmware and changelog can be downloaded from : Firmware download link

Methods to Update Firmware:

• (Recommanded way) OTA firmware update via wireless : http://wiki.dragino.com/xwiki/bin/view/Main/Firmware%20OTA%20Update%20for%20Sensors/

• Update through UART TTL interface : Instruction.

6. FAQ

6.1  AT Commands 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. 

6.2 Can I connect 3rd party flow sensor other than the default one?

If a user wants to connect SW3L-LB to a 3rd party flow sensor such as a DN50 flow sensor, that is possible. A flow sensor with pulse output is needed.

Below is the notice for the connection:

1. Connect the 3rd party flow meter to the pulse input and GND of SW3L-LB.

2. Make sure the pulse output voltage of 3rd party flow sensor is less than 5v.

3. It is not recommended to use SW3L-LB to power the external flow meter, unless you are sure the external flow sensor is low power ( several uA). Otherwise the battery of SW3L-LB will be running out soon.

4. After connection, user needs to set the Calculator Flag and change the payload so to get the correct reading in the platform.

Connection:

7. Order Info

Part Number: SW3L-LB-XXX-YYY  or SW3L-LS-XX-YY

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. ​Packing Info

Package Includes:

• SW3L-LB or SW3L-LS LoRaWAN Flow Sensor

Dimension and weight:

• Device Size: cm

• Device Weight: g

• Package Size / pcs : cm

• Weight / pcs : g

9. 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.cc.