netvox R720E User manual

Model：R720E
Wireless TVOC /Temperature /Humidity Sensor
Wireless TVOC /
Temperature / Humidity Sensor
R720E
User Manual
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.

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Table of Content
1. Introduction.............................................................................................................................................................2
2. Appearance..............................................................................................................................................................2
3. Main Features..........................................................................................................................................................3
4. Set up Instruction ....................................................................................................................................................4
5. Data Report .............................................................................................................................................................5
6. Installation...............................................................................................................................................................9
7. Information about Battery Passivation .................................................................................................................10
8. Important Maintenance Instruction.......................................................................................................................11

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1. Introduction
R720E is the temperature, humility and TVOC detection device which is Class A device of NETVOX based on
LoRaWANTM protocol.
LoRa Wireless Technology:
LoRa is a wireless communication technology dedicated to long distance 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.
2. Appearance
Indicator
Function Key Built-in TVOC Sensor

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3. Main Features
Adopt SX1276 wireless communication module
2 ER14505 lithium batteries AA size (3.6V / section) in parallel
TVOC concentration, temperature, and humidity detection
The base is attached with a magnet that can be attached to a ferromagnetic material object
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.

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4.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
Low Voltage 3.2V

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5. 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 * Minimum time should not be less than 4min.
Battery Change =0x01 (0.1V)
TVOC Change = 0x012C (300 ppb)
TVOC Measurement Range
:
0 ppb to 60000 ppb
Excellent 0 to 65 ppb
Good 65 to 220 ppb
Moderate 220 to 660 ppb
Poor 660 to 2200 ppb
Unhealthy 2200 to 60000 ppb
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.At present, this step has been completed before the shipment.)
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 LoraWANApplication Command document and
http://loraresolver.netvoxcloud.com:8888/page/index

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Data report configuration and sending period are as following:
Example of ConfigureCmd
FPort：0x07
Bytes 1 Byte 1 Byte Var (Fix =9 Bytes)
CmdID DeviceType NetvoxPayLoadData
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)
(1)Command Configuration:
MinTime = 5min, MaxTime = 5min, BatteryChange = 0.1v, TVOC Change=100ppb
Downlink：01A5012C012C0100640000
Response：
81A5000000000000000000（Configuration success）
81A5010000000000000000（Configuration failure）
* When min time < 4min, Configuration fails
(2)Read Configuration:
Downlink：02A5000000000000000000
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

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Response：
82A5012C012C0100640000（Current configuration）
(3)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
FPort：0x06
Bytes 1 Byte 1 Byte 1 Byte Var(Fix=8 Bytes)
Version DeviceType ReportType NetvoxPayLoadData
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 the devicetype
NetvoxPayLoadData– Fixed bytes (Fixed =8bytes)
Device
Device
Type
Report
Type NetvoxPayLoadData
R720E 0xA5 0x01 Battery
(1Byte, Unit: 0.1V) TVOC (2Bytes, 1ppb) Temperature (Signed2Bytes, Unit: 0.01°C)
Humidity
(2Bytes, Unit: 0.01%) Reserved (1Byte, fixed 0x00)
Uplink：01A5012400290A4B11B400
TVOC= 0029 Hex = 41 Dec , 41ppb
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/MaxTime logic:
Example#1 based on MinTime = 1 Hour, MaxTime= 1 Hour, Reportable Change i.e. BatteryVoltageChange=0.1V
MaxTime MaxTime
Sleeping(MinTime) Sleeping(MinTime)
Wake up and collects data
REPORTS 3.6V
Wakes up and collects data
REPORTS 3.6V
Wakes up and collects data
REPORTS 3.6V

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Note: MaxTime=MinTime. Data will only be report according to MaxTime (MinTime) duration regardless BatteryVoltageChange
value.
Example#2 based on MinTime = 15 Minutes, MaxTime= 1 Hour, Reportable Change i.e. BatteryVoltageChange= 0.1V.
MaxTime
Sleeping(MinTime) sleeping sleeping sleeping
0H 15th M 30th M 45th M 1H 2H
Example#3 based on MinTime = 15 Minutes, MaxTime= 1 Hour, Reportable Change i.e. BatteryVoltageChange= 0.1V.
MaxTime
sleeping sleeping ...
0H 15th M 30th M 45th M 1H 1H 10th M 1H 25th M 1H 40th M 1H 55th M 2H 10th M
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.
Wakes up and
collects data
3.6V
Does not report
Wakes up and
collects data
3.6V
Does not report
Wakes up and
collects data
3.6V
Does not report
Wakes up and
collects data
REPORTS 3.6V
Wakes up and
collects data
REPORT 3.6V
Wakes up and
collects data
REPORTS 3.6V
Wakes up and collects data
3.5V |3.5-3.6|=0.1
REPORTS 3.5V
Wakes up and
collects data
3.5V
Does not report
Wakes up and
collects data
3.5V
Does not report
Wakes up and
collects data
3.5V
Does not report
Wakes up and
collects data 3.5V
Does not report
Wakes up and
collects data
3.5V
Does not report
Wakes up and
collects data
REPORTS 3.5V
Wakes up and
collects data
3.6V
Does not report
Users push the button,
REPORTS 3.5V.
Recalculate MaxTime.

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6. Installation
1. R720E has a built-
in magnet (the dotted line in the figure below).
When installing, the sensor can be attached to the surface of iron
objects.
2. If it is installed on a wall or other object without iron, users can
install another piece of iron on the wall or other object, and then
attach the sensor to the iron.
Note:
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.
R720E is suitable below scenarios:
Residential
Shopping mall
Station
School
Airport
Construction site
The place needs to detect the TVOC, temperature, or
humidity.
4. 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.
5. 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 defaults 15 minutes.
传感器
R720E
地面
安装示意图
R720E
Installation Diagram
Ground

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7. 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 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

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8. 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 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 excessive cold place. 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 repairing.