netvox R720C User manual

Model：R720C
WirelessAir Pressure and Temperature Sensor
Wireless Air Pressure
and
Temperature Sensor
R720C
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.

1
Table of Content
1. Introduction.............................................................................................................................................................2
2. Appearance..............................................................................................................................................................2
3. Main Feature ...........................................................................................................................................................3
4. Set Up Instruction ...................................................................................................................................................4
5. Data Report .............................................................................................................................................................5
6. Information about Battery Passivation .................................................................................................................11
7. Important Maintenance Instruction.......................................................................................................................12

2
1. Introduction
R720C is a device for detecting air pressure and temperature that is a ClassA device based on the LoRaWAN open protocol of
Netvox, and is compatible with the LoRaWAN 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 an air pressure sensor

3
3. Main Feature
Compatible with LoRaWAN
2 ER14505 lithium batteries (3.6V / section) parallel power supply
Detect atmospheric pressure and temperature in air
The base is attached with a magnet that can be attached to a ferrous 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 lifetime for varied models at different configurations.

4
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 till 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.
2. On/off interval is suggested to be about 10 seconds to avoid the interference of
capacitor inductance and other energy storage components.
3. Five 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
(Not in the factory setting)
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 ThresholdAlarm
Low Voltage 3.2V

5
5. Data Report
The device will immediately send a report of the version package and a report data with atmospheric pressure and temperature
values.
The device sends data in the default configuration before any configuration is done.
Maximum time: Max Interval = 15min
Minimum time: Min Interval = 15min (The current voltage value is detected every Min Interval according to the default.)
Default reportchange:
BatteryChange ---- 0x01 (0.1v)
PressureChange ---- 0x000A (1 hPa)
TemperatureChange ---- 0x0064 (1℃)
Note:
1. The unit of air pressure in the data packet is 0.01hPa, and the unit of air pressure change is 0.1hPa.
Notice the difference between the two units.
2.The cycle that the device reporting the data is configurated before shipment.
3.The interval between two reports must be the minimum time
(If there is special customized shipment, the setting is changed according to customer requirements.)
The data parsing reported by the device is referenced by the Netvox LoraWAN Application Command document and
http://www.netvox.com.cn:8888/page/index
Data report configuration and sending period are as following:
Min Interval
(Unit: second)
Max Interval
(Unit: second) Reportable Change Current Change≥ Reportable Change
Current Change＜
Reportable Change
Any number between
1~65535
Any number between
1~65535 Can not be 0 Report per Min Interval
Report
per Max Interval

6
Example of ConfigureCmd
FPort：0x07
Bytes 1 1 Var(Fix =9 Bytes)
CmdID DeviceType NetvoxPayLoadData
CmdID– 1 bytes
DeviceType– 1 byte – Device Type of Device
NetvoxPayLoadData– var bytes (Max=9bytes)
Description Device Cmd
ID
Device
Type NetvoxPayLoadData
Config
ReportReq
R720C
0x01
0x70
MinTime
(2bytes Unit: s)
MaxTime
(2bytes Unit: s)
Battery
Change
(1byte Unit:0.1v)
Temperature
Change
(2byte
Unit:0.01℃)
AirPress
Change
(2byte
Unit:0.1hPa)
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)
Temperature
Change
(2byte
Unit:0.01℃)
AirPress
Change
(2byte
Unit:0.1hPa)
(1)Configure R720C device parameter MinTime = 1min、MaxTime = 1min、BatteryChange = 0.1v、
TemperatureChange=1℃(100*0.01℃), AirPressChange=1hPa (10*0.1hPa)
Downlink: 0170003C003C010064000A
Device return:
Uplink: 8170000000000000000000 (configuration success)
Uplink: 8170010000000000000000 (configuration failure)
(2)Read R720C device parameter
Downlink: 0270000000000000000000
Device return:
Uplink: 8270003C003C010064000A (device current parameter)

7
Example of ReportDataCmd
FPort：0x06
Bytes 1 1 1 Var(Fix=8 Bytes)
Version DeviceType ReportType NetvoxPayLoadData
Version– 1 bytes –0x01——the Version of NetvoxLoRaWAN Application Command Version
DeviceType– 1 byte – Device Type of Device
The devicetype is listed in Netvox LoRaWAN Application Devicetype doc
ReportType – 1 byte –the presentation of the NetvoxPayLoadData，according the devicetype
NetvoxPayLoadData– Fixed bytes (Fixed =8bytes)
R720C 0x70 0x01 Battery
(1Byte, unit: 0.1V)
AirPressure
(4Bytes, unit: 0.01hPa)
Temperature
(Signed2Bytes, unit: 0.01°C)
Reserved
(1Bytes, fixed 0x00)
Ex1. Uplink: 01700124000181F009C400
1st byte (01): Version
2ndbyte(70): DeviceType 0x70 －R720C
3rdbyte(01): ReportType
4th byte(24): Battery , 24 Hex=36 Dec 36*0.1v=3.6v
5th6th7th8th byte(000181F0): Air Pressure, 181F0 Hex=98800 Dec 98800*0.01hPa = 988hPa
9th10th byte(09C4): Temperature, 09C4 Hex=2500 Dec 2500*0.01°C= 25°C
11th byte(00): Reserved
Ex2. Uplink: 0170019F00011170FE0C00
1st byte (01): Version
2ndbyte(70): DeviceType 0x70 －R720C
3rdbyte(01): ReportType
4th byte(9F): Battery (Bit7 represent low battery), 1F Hex=31 Dec 31*0.1v=3.1v
5th6th7th8th byte(00011170): Air Pressure, 11170 Hex=70000 Dec 70000*0.01hPa = 700 hPa
9th10th byte(FE0C): Temperature (must decode with signed type value), FE0C Hex= -500 Dec -500*0.01°C= -5 °C
11th byte(00): Reserved

8
Example of GlobalCalibrateCmd Configuration
FPort：0x0E (Port:14)
Description Cmd
ID
Sensor
Type PayLoad(Fix =9 Bytes)
SetGlobal
CalibrateReq 0x01
0x01
0x35
Channel(1Byte)
0_Channel1,
1_Channel2,etc
Multiplier
(2bytes,Unsigned) Divisor (2bytes,Unsigned) DeltValue (2bytes,Signed)
Reserved
(2Bytes,Fixed
0x00)
SetGlobal
CalibrateRsp 0x81 Channel(1Byte)
0_Channel1,
1_Channel2,etc
Status
(1Byte,0x00_success) Reserved (7Bytes,Fixed 0x00)
GetGlobal
CalibrateReq 0x02 Channel
(1Byte,0_Channel1,1_Channel2,etc) Reserved (8Bytes,Fixed 0x00)
GetGlobal
CalibrateRsp 0x82 Channel(1Byte)
0_Channel1,
1_Channel2,etc
Multiplier
(2bytes,Unsigned) Divisor (2bytes,Unsigned) DeltValue (2bytes,Signed)
Reserved
(2Bytes,Fixed
0x00)
ClearGlobal
CalibrateReq 0x03 Reserved
(10Bytes,Fixed 0x00)
ClearGlobal
CalibrateRsp 0x83 Status
(1Byte,0x00_success) Reserved (9Bytes,Fixed 0x00)
SensorType
Temperature 0x01
Air Press Sensor 0x35
The following example is 0x35 atmospheric pressure of GlobalCalibrateCmd.
(1)If the R720C detects is 1000 hPa and the actual atmospheric pressure is 999 hPa, it means the calibration we want to make is
-1hPa.
Configure R720C device parameter Channel = 01、Multiplier = 000A 、Divisor = 0000、DeltValue = FFFF(-1)
(The calibration data is 000A*FFFF = -10)
Downlink:
013501000A0000FFFF0000
Device return:
Uplink: 8135010000000000000000 (configuration success)
Uplink: 8135010100000000000000 (configuration failure)

9
(2)Read R720C device parameter
Downlink: 0235010000000000000000
Device return:
Uplink: 823501000A0000FFFF0000 (device current parameter)
(3)Clear R720C device parameter
Downlink: 0300000000000000000000
Device return:
Uplink: 8300000000000000000000
Note:
1. When Multiplier is not 1, Calibration value = DeltValue*Multiplier.
2. When Divisor is not 1, Calibration value = DeltValue/Divisor.
3. The choices of the Channel would be 00-03 Channel
4. With different sensor type, it is forbidden to use that same Channel number.
5. This universal calibration supports calibration of positive and negative numbers.
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)
Note: MaxTime=MinTime. Data will only be report according to MaxTime (MinTime) duration regardless BatteryVoltageChange
value.
Wake up and collects data
REPORTS 3.6V
Wakes up and collects data
REPORTS 3.6V
Wakes up and collects data
REPORTS 3.6V

10
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.

11
6. 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
Note:
Please do not disassemble the device unless it is required to replace the batteries.
Do not touch the waterproof gasket, LED indicator light, function keys when replacing the batteries. Please use suitable
screwdriver to tighten the screws (if using an electric screwdriver, it is recommended to set the torque as 4kgf) to ensure the
device is impermeable.

12
7.Important Maintenance Instruction
Kindly pay attention to the following in order to achieve the best maintenance of the product:
• 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.