netvox R720E Wireless TVOC Detection Sensor User Manual

netvox R720E Wireless TVOC Detection Sensor

Introduction

R720E is the temperature, humility, and TVOC detection device which is a Class A device of NETVOX based on the LoRaWANTM protocol.
LoRa Wireless Technology:
Lora is a wireless communication technology dedicated to long distances and low power consumption. Compared with other communication methods, LoRa spread spectrum modulation method greatly increases to expand the communication distance. Widely used in long-distance, low-data wireless communications. For example, automatic meter reading, building automation equipment, wireless security systems, industrial monitoring. Main features include small size, low power consumption, transmission distance, anti-interference ability and so on.
LoRaWAN:
LoRaWAN uses LoRa technology to define end-to-end standard specifications to ensure interoperability between devices and gateways from different manufacturers.

Appearance

Main Features

• Adopt SX1276 wireless communication module
• 2 ER14505 lithium batteries AA size (3.6V / section) in parallel
• TVOC concentration, temperature, and humidity detection
• Protection class IP65
• Compatible with LoRaWANTM Class A
• Frequency hopping spread spectrum
• Configuration parameters can be configured via a third-party software platform, data can be read and alerts can be set via SMS text and email (optional)
• Applicable to third-party platforms: Actility/ ThingPark, TTN, MyDevices/ Cayenne
• Low power consumption and long battery life

Note:

• Battery life is determined by the sensor reporting frequency and other variables, please refer to
• http://www.netvox.com.tw/electric/electric_calc.html
• On this website, users can find battery life time for varied models at different configurations.

Set up Instruction

On/Off

Power on| Insert batteries. (users may need a screwdriver to open)
Turn on| Press and hold the function key for 3 seconds till the green indicator flashes once.
Turn off

(Restore to factory setting)

| ****

Press and hold the function key for 5 seconds, and the green indicator flashes 20 times.

Power off| Remove Batteries.

Note:

| 1.     Remove and insert the battery; the device is at off state by default. Press and hold

the function key for 3 seconds till the green indicator flashes once to turn on the device.

2.     On/off interval is suggested to be about 10 seconds to avoid the interference of capacitor inductance and other energy storage components.

3.  At the first 5 seconds after power on, the device will be in engineering test mode.

Network Joining

Never joined the network

| Turn on the device to search the network.

The green indicator stays on for 5 seconds: success The green indicator remains off: fail

Had joined the network

| Turn on the device to search the previous network. The green indicator stays on for 5 seconds: success

The green indicator remains off: fail

Fail to join the network

| Suggest to check the device verification information on the gateway or consult your platform

server provider.

Function Key

Press and hold for 5 seconds

| Restore to factory setting / Turn off

The green indicator flashes 20 times: success The green indicator remains off: fail

Press once

| The device is in the network: green indicator flashes once and sends a report

The device is not in the network: green indicator remains off

Sleeping Mode

The device is on and in the network

| Sleeping period: Min Interval.

When the reportchange exceeds setting value or the state changes: send a data report according to Min. Interval.

Low Voltage Warning

Data Report

The device will immediately send a version packet report and a data report including voltage of the battery and TVOC value. The device sends data according to the default configuration before any other configuring.

Default Setting:

• Maximum time: Max Interval=15 min
• Minimum time: Min Interval =15 min
• Battery Change = 0x01 (0.1V)
• TVOC Change = 0x012C (300 ppb)
• The minimum time should not be less than 4min.

Note:

1. R720E needs to work for 13 hours after the first power-on. (The sensor needs to be calibrated automatically during the 13 hours, and the data will be biased during this period. The accurate data shall prevail after 13 hours.)

2. On the condition that the sensor can operate normally, the read data is valid after the device is powered off and has been turned on again for 20 minutes.
   (The 20 minutes is the time for the sensor to enter a stable state.)

3. The device will report 0xFFFF when the sensor is damaged, the initiation fails, and the device fails to read the data three times continuously after warming up.

• The above process will be completed automatically after the device is turned on; therefore, users do not need to operate by self.
• The data parsing reported by the device is referenced by the Netvox LoraWAN Application Command document and
• http://loraresolver.netvoxcloud.com:8888/page/index

Data report configuration and sending period are as follows:

Min Interval

(Unit: second)

| Max Interval

(Unit: second)

|

Reportable Change

| Current Change ≥

Reportable Change

| Current Change＜

Reportable Change

---|---|---|---|---
Any number

≥ 240

| Any number between

240~65535

|

Can not be 0

| Report

per Min Interval

| Report

per Max Interval

Example of ConfigureCmd

FPort： 0x07

Config

ReportReq

|

R720E

|

0x01

|

0xA5

|

MinTime (2bytes Unit: s)

|

MaxTime (2bytes Unit: s)

|

BatteryChange (1byte Unit:0.1v)

|

TVOC Change (2bytes Unit：1ppb)

| Reserved (2Bytes, Fixed 0x00)
---|---|---|---|---|---|---|---|---
Config

ReportRsp

|

0x81

|

Status (0x00_success)

|

Reserved (8Bytes, Fixed 0x00)

ReadConfig

ReportReq

|

0x02

|

Reserved (9Bytes, Fixed 0x00)

ReadConfig

ReportRsp

|

0x82

|

MinTime (2bytes, Unit: s)

|

MaxTime (2bytes, Unit: s)

|

BatteryChange (1byte, Unit: 0.1v)

|

TVOC Change (2bytes, Unit: 1ppb)

|

Reserved (Bytes, Fixed 0x00)

ResetTVOC

BaseLineReq

|

0x03

|

Reserved (9Bytes, Fixed 0x00)

ResetTVOC

BaseLineRsp

|

0x83

|

Status (0x00_success)

|

Reserved (8Bytes, Fixed 0x00)

Command Configuration:

• Minime = 5min, Maxime = 5min, BatteryChange = 0.1v, TVOC Change=100ppb
  Downlink： 01A5012C012C0100640000
  Response：

  • 81A5000000000000000000（Configuration success）
  • 81A5010000000000000000（Configuration failure）

• When min time < 4min, Configuration fails

Read Configuration

• Downlink： 02A5000000000000000000
• Response： 82A5012C012C0100640000（Current configuration）

Calibrate the baseline:

After the configuration is successful, users can re-acquire and set the baseline value after 13 hours.

• Downlink： 03A5000000000000000000
• Response：
  • 83A5000000000000000000（Configuration success）
  • 83A5010000000000000000（Configuration failure）

Example of ReportDataCmd

• Version– 1 byte–0x01——the Version of NetvoxLoRaWAN Application Command Version DeviceType– 1 byte – Device Type of Device
• ReportType – 1 byte –the Presentation of the NetvoxPayLoadData according to the devicetype
• NetvoxPayLoadData– Fixed bytes (Fixed =8bytes)

Device

| Device

Type

| Report

Type

|

NetvoxPayLoadData

---|---|---|---

R720E

|

0xA5

|

0x01

| Battery (1Byte, Unit: 0.1V)| TO

(2Bytes, 1ppb)

| Temperature (Signed2Bytes, Unit: 0.01°C)| Humidity (2Bytes, Unit: 0.01%)| Reserved (1Byte, fixed 0x00)

• Uplink： 01A5012400290A4B11B400
  • TVOC= 0029 Hex = 41 Dec , 41 ppb
  • Temperature= 0A4B Hex = 2635 Dec , 2635*0.01° = 26.35 °C
  • Humidity= 11B4 Hex = 4532 5 Dec , 4532*0.01% = 45.32 %

Example for MinTime/Maxime logic:

Example#1 based on MinTime = 1 Hour, MaxTime= 1 Hour, Reportable Change i.e. BatteryVoltageChange=0.1V

Note: MaxTime=MinTime. Data will only be reported according to Maxime (MinTime) duration regardless BatteryVoltageChange value.

Example#2 based on MinTime = 15 Minutes, MaxTime= 1 Hour, Reportable Change i.e. BatteryVoltageChange= 0.1V. Example#3 based on MinTime = 15 Minutes, MaxTime= 1 Hour, Reportable Change i.e. BatteryVoltageChange= 0.1V .

Notes :

1. The device only wakes up and performs data sampling according to MinTime Interval. When it is sleeping, it does not collect data.
2. The data collected is compared with the last data reported. If the data variation is greater than the ReportableChange value, the device reports according to MinTime interval. If the data variation is not greater than the last data reported, the device reports according to MaxTime interval.
3. We do not recommend to set the MinTime Interval value too low. If the MinTime Interval is too low, the device wakes up frequently and the battery will be drained soon.
4. Whenever the device sends a report, no matter resulting from data variation, button pushed or MaxTime interval, another cycle of MinTime/MaxTime calculation is started.

Installation

1. R720E is pasted with 3M double-sided tape (Figure 1 below). First, remove the middle part of the double-sided tape (the red frame in Figure 1).
2. Tear off the backing paper on one side of the double-sided tape, and paste the double-sided tape on the back of the device (Figure 2 below).
3. Finally, tear off the backing paper on the other side of the double-sided tape, and paste the device on a wall or other objects. (Please do not stick the device on the rough wall or object to avoid the device from falling off after a long time of use.)

Note:

• Before installation, be sure to wipe the wall or other objects clean to avoid dust on the wall or other objects which will affect the effect of the installation.
• Do not install the device in a metal shielded box or an environment with other electrical equipment around to avoid affecting the wireless transmission signal of the device.
• When sticking 3M double-sided tape, be sure to stick the double-sided tape within the structure of the device so as not to affect the appearance.

1. R720E detects according to Min Time. When the detected TVOC value or battery voltage is compared with the last report, the value exceeds the set value. (Default TVOC Value: 300ppb; Default Battery Voltage: 0.1V) If the TVOC concentration exceeds 300ppb or the battery voltage exceeds 0.1V, the currently detected TVOC, temperature, and humidity will be sent.
2. If the variation of TVOC concentration or battery voltage does not exceed the set value, the data is reported regularly according to the Max Time.

Note: Min Time and Max Time default 15 minutes.

R720E is suitable below scenarios:

• Residential
• Shopping mall
• Station
• School
• Airport
• Construction site
• The place needs to detect the TVOC, temperature, or humidity.

Information about Battery Passivation

Many of Netvox devices are powered by 3.6V ER14505 Li-SOCl2 (lithium-thionyl chloride) batteries that offer many advantages including low self-discharge rate and high energy density. However, primary lithium batteries like Li-SOCl2 batteries will form a passivation layer as a reaction between the lithium anode and thionyl chloride if they are in storage for a long time or if the storage temperature is too high. This lithium chloride layer prevents rapid self-discharge caused by a continuous reaction between lithium and thionyl chloride, but battery passivation may also lead to voltage delay when the batteries are put into operation, and our devices may not work correctly in this situation. As a result, please make sure to source batteries from reliable vendors, and the batteries should be produced within the last three months. If encountering the situation of battery passivation, users can activate the battery to eliminate the battery hysteresis.

• To determine whether a battery requires activation Connect a new ER14505 battery to a 68ohm resistor in parallel, and check the voltage of the circuit. If the voltage is below 3.3V, it means the battery requires activation.
• How to activate the battery

1. Connect a battery to a 68ohm resistor in parallel
2. Keep the connection for 6~8 minutes
3. The voltage of the circuit should be ≧3.3V

Important Maintenance Instruction

The device is a product with superior design and craftsmanship and should be used with care. The following suggestions will help you use the warranty service effectively.

• Keep the equipment dry. Rain, moisture, and various liquids or water may contain minerals that can corrode electronic circuits. In case the device is wet, please dry it completely.
• Do not use or store in dusty or dirty areas. This way can damage its detachable parts and electronic components.
• Do not store in an excessive heat place. High temperatures can shorten the life of electronic devices, destroy batteries, and deform or melt some plastic parts.
• Do not store in excessively cold places. Otherwise, when the temperature rises to normal temperature, moisture will form inside which will destroy the board.
• Do not throw, knock, or shake the device. Treating equipment roughly can destroy internal circuit boards and delicate structures.
• Do not wash with strong chemicals, detergents, or strong detergents.
• Do not paint the device. Smudges can make debris block detachable parts up and affect normal operation.
• Do not throw the battery into the fire to prevent the battery from exploding. Damaged batteries may also explode.
• All the above suggestions apply equally to your device, batteries, and accessories.
• If any device is not operating properly.
• Please take it to the nearest authorized service facility for repair.

Copyright©Netvox Technology Co., Ltd.
This document contains proprietary technical information which is the property of NETVOX Technology. It shall be maintained in strict confidence and shall not be disclosed to other parties, in whole or in part, without written permission of NETVOX Technology. The specifications are subject to change without prior notice.

References

• Netvox Command Resolver
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