netvox R311FA1 User manual

Wireless 3-axis Accelerometer Sensor
R311FA1
Wireless 3-axis Accelerometer Sensor
R311FA1
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 Features............................................................................................................................................................3
4.Set up Instruction ......................................................................................................................................................4
5.Data Report ...............................................................................................................................................................5
5.1 ActiveThreshold and InActiveThreshold .........................................................................................................6
5.2 Calibration.........................................................................................................................................................6
5.3 Example of ReportDataCmd.............................................................................................................................6
5.4 Example of ConfigureCmd...............................................................................................................................8
5.5 Example of MinTime/MaxTime logic............................................................................................................10
5.6 The X, Y, Z axis direction of R311FA1..........................................................................................................11
6.Installation...............................................................................................................................................................12
7.Important Maintenance Instruction.........................................................................................................................13

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1. Introduction
R311FA1 is the LoRaWANTM Class A device which detects three-axis acceleration and is compatible with LoRaWAN protocol.
When the device moves or vibrates over threshold value, it immediately reports the acceleration and velocity of the X, Y, and Z
axes.
LoRa Wireless Technology:
LoRa is a wireless communication technology famous for its long-distance transmission and low power consumption. Compared
with other communication methods, LoRa spread spectrum modulation technique greatly extend the communication distance. It
can be widely used in any use case that requires long-distance and low-data wireless communications. For example, automatic
meter reading, building automation equipment, wireless security systems, industrial monitoring. It has features like small size, low
power consumption, long transmission distance, strong 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
Function Key
Indicator

3
3. Main Features
Adopt SX1276 wireless communication module
2 sections 3.0V CR2450 button batteries
Detect the three-axis acceleration and velocity of the device and the voltage
Compatible with LoRaWANTM Class A
Frequency hopping spread spectrum technology
Configuration parameters can be configured through third-party software platforms, data can be read and alarms can be set via
SMS text and email (optional)
Available third-party platform: 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);
(Insert two sections of 3V CR2450 button batteries and close the battery cover.)
Turn on Press any function key, and the 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 memorizes previous on/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. Press any function key and insert batteries at the same time; it will enter engineer testing
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, a data report will be sent
according to Min Interval.
Low Voltage Warning
Low Voltage
2.4V

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5. Data Report
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
The device will immediately send a version packet report and two attribute data reports.
Data will be reported by default setting before any configuration.
Default setting:
Max Interval: 3600s
Min Interval: 3600s (The current voltage is detected every Min Interval by default.)
Battery Voltage Change: 0x01 (0.1V)
Acceleration Change: 0x03 (m/s²)
R311FA1 Three-axis acceleration and velocity: s:
1. After the three-axis acceleration of the device exceeds ActiveThreshold, a report is sent immediately to report the three-
axis acceleration and velocity.
2. After reporting, the three-axis acceleration of the device needs to be lower than InActiveThreshold, and the duration is
greater than 5s (cannot be modified). Then, the next detection will start. If the vibration continues during this process after
the report is sent, the timing will restart.
3. The device sends two data packets, one is the acceleration of the three axes, and the other is the velocity of the three axes.
The interval between the two packets is 10s.
Note:
(1) The device report interval will be programmed based on the default firmware.
(2) The interval between two reports must be the minimum time.
The reported data is decoded by the Netvox LoRaWAN Application Command document and
http://loraresolver.netvoxcloud.com:8888/page/index

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5.1 ActiveThreshold and InActiveThreshold
Formula
Active Threshold/InActiveThreshold =Critical value ÷ 9.8÷ 0.0625
* The gravitational acceleration at standard atmospheric pressure is 9.8 m/s2
* The scale factor of the threshold is 62.5 mg
Active Threshold Active Threshold can be changed by ConfigureCmd
Active Threshold range is 0x0003-0x00FF (default is 0x0003);
InActiveThreshold
InActiveThreshold can be changed by ConfigureCmd
InActiveThreshold range is 0x0002-0x00FF (default is 0x0002)
* Active Threshold and InActiveThreshold can not be the same
Example
Assuming that the critical value is set to be 10m/s2, the Active Threshold would be set
10/9.8/0.0625=16.32
Active Threshold would be set integer as 16.
5.2 Calibration
The accelerometer is a mechanical structure that contains components that can move freely.
These moving parts are very sensitive to mechanical stress, far beyond solid-state electronics.
The 0g offset is an important accelerometer indicator because it defines the baseline used to measure acceleration.
After installing R311FA1,
users need to let the device rest for 1 minute, and then power on. Then, turn on the device and wait for
the device taking 1 minute to join the network. After that, the device will automatically executes the calibration.
After calibration, the reported three-axis acceleration value will be within 1m/s2.
When the acceleration is within 1m/s2and thevelocity is within 160mm/s, it can be judged that the device is stationary.
5.3 Example of ReportDataCmd
FPort：0x06
Bytes 1 1 1 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
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)

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Device Device
Type
Report
Type NetvoxPayLoadData
R311FA1
(R311FD) 0xC7
0x01 Battery
(1Byte, unit:0.1V)
AccelerationX
(Float16_2Bytes, m/s
2
)
AccelerationY
(Float16_2Bytes, m/s
2
)
AccelerationZ
(Float16_2Bytes, m/s
2
)
Reserved
(1Byte,fixed 0x00)
0x02 VelocityX
(Float16_2Bytes, mm/s)
VelocityY
(Float16_2Bytes, mm/s)
VelocityZ
(Float16_2Bytes, mm/s)
Reserved
(2Bytes,fixed 0x00)
Example of uplink:
# packet 1: 01C7011E6A3E883E1F4100
1st byte (01): Version
2nd byte (C7): DeviceType 0XC7 －R311FA1
3rd byte (01): ReportType
4th byte (1E): Battery－3v , 1E Hex=30 Dec 30*0.1v=3v
5th 6th byte (6A3E): Acceleration X, float32(3E6A0000) = 0.22851562 m/s2
7th 8th byte (883E): Acceleration Y, float32(3E880000) = 0.265625 m/s2
9th 10th byte (1F41): Acceleration Z, float32(411F0000) = 9.9375 m/s2
11th byte (00): Reserved
# packet 2: 01C70212422B42C7440000
1st byte (01): Version
2nd byte (C7): DeviceType 0XC7 －R311FA1
3rd byte (02): ReportType
4th 5th byte (1242): Acceleration X, float32(42120000) = 36.5 mm/s
6th 7th byte (2B42): Acceleration Y, float32(422B0000) = 42.75 mm/s
8th 9th byte (C744): Acceleration Z, float32(44C70000) = 1592.0 mm/s
10th ~11th byte (0000): Reserved
* R311FA1 value uses big-endian computing.
*Because of the length limitation of R311FA1 instruction. Therefore, R311FA1 sends out 2 bytes and adds 0 to the data to
form 4 bytes of float32.

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5.4 Example of ConfigureCmd
FPort：0x07
Bytes 1 1 Var (Fix =9 Bytes)
CmdID DeviceType NetvoxPayLoadData
CmdID– 1 byte
DeviceType– 1 byte – Device Type of Device
NetvoxPayLoadData– var bytes (Max=9bytes)
(1)Command Configuration:
MinTime = 1min, MaxTime = 1min, BatteryChange = 0.1v, Acceleratedspeedchange = 1m/s²
Downlink：01C7003C003C0100010000 003C(Hex) = 60(Dec)
Response：
81C7000000000000000000（Configuration success）
81C7010000000000000000（Configuration failure）
(2)Read Configuration:
Downlink：02C7000000000000000000
Response：
82C7003C003C0100010000（Current configuration）
Description Device Cmd
ID
Device
Type NetvoxPayLoadData
Config
ReportReq
R311FA1
0x01
0xC7
MinTime
(2bytes Unit:s)
MaxTime
(2bytes Unit:s)
BatteryChange
(1byte Unit:0.1v)
AccelerationChange
(2byte Unit:m/s2)
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)
AccelerationChange
(2byte Unit:m/s2)
Reserved
(2Bytes,Fixed 0x00)

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Assuming that the ActiveThreshold is set to 10m/s2, the value to be set is 10/9.8/0.0625=16.32, and the last value obtained is an
integer and is configured as 16.
Assuming that the InActiveThreshold is set to 8m/s2, the value to be set is 8/9.8/0.0625=13.06, and the last value obtained is an
integer and is configured as 13.
(3)Configure device parameters ActiveThreshold=16, InActiveThreshold=13
Downlink: 03C70010000D0000000000 0010(Hex) = 16(Dec) , 000D(Hex) = 13(Dec)
Response：
83C7000000000000000000 (configuration is successful)
83C7010000000000000000 (configuration failed)
(4)Read device parameters
Downlink: 04C7000000000000000000
Response: 84C70010000D0000000000 (device current parameter)
Description Device Cmd
ID
Device
Type NetvoxPayLoadData
SetActive
ThresholdReq
R311FA1
0x03
0xC7
ActiveThreshold
(2Bytes)
InActiveThreshold
(2Bytes)
Reserved
(5Bytes,Fixed 0x00)
SetActive
ThresholdRsp 0x83 Status (0x00_success)
Reserved
(8Bytes,Fixed 0x00)
GetActive
ThresholdReq
0x04 Reserved
(9Bytes,Fixed 0x00)
GetActive
ThresholdRsp 0x84 ActiveThreshold (2Bytes)
InActiveThreshold
(2Bytes)
Reserved
(5Bytes,Fixed 0x00)
SetRestore
ReportReq 0x07
RestoreReportSet (1byte,
0x00_DO NOT report when sensor restore;
0x01_DO report when sensor restore)
Reserved
(8Bytes, Fixed 0x00)
SetRestore
ReportRsp 0x87 Status (0x00_success)
Reserved
(8Bytes, Fixed 0x00)
GetRestore
ReportReq 0x08 Reserved (9Bytes,Fixed 0x00)
GetRestore
ReportRsp 0x88
RestoreReportSet (1byte,
0x00_DO NOT report when sensor restore;
0x01_DO report when sensor restore)
Reserved
(8Bytes, Fixed 0x00)

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(5)Configure DO report when sensor restore (When the vibration stops, R311FA1 will report an uplink package)
Downlink: 07C7010000000000000000
Response：
87C7000000000000000000 (configuration success)
87C7010000000000000000 (configuration failure)
(6)Read device parameters
Downlink: 08C7000000000000000000
Response：
88C7010000000000000000 (device current parameter)
5.5 Example of MinTime/MaxTime logic
Example#1 based on MinTime = 1 Hour, MaxTime= 1 Hour, Reportable Change i.e. BatteryVoltageChange=0.1V
Max Time Max Time
Sleeping (Min Time) Sleeping (Min Time)
1H 2H 3H
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
Wakes up and
collects data
2.8V
Does not report
Wakes up and
collects data
REPORTS 2.8V
Wakes up and
collects data
REPORT 2.8V
Wake up and
collects data
REPORTS 2.8V
Wakes up and
collects data
REPORTS 2.8V
Wakes up and
collects data
REPORTS 2.8V
Wakes up and
collects data
2.8V
Does not report
Wakes up and
collects data
2.8V
Does not report

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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 change value 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.
5.6 The X, Y, Z axis direction of R311FA1
Wakes up and
collects data
REPORTS
2.8V
Wakes up and
collects data
2.7V |2.7-2.8|=0.1
REPORTS 2.7V
Wakes up and
collects data
2.7V
Does not report
Wakes up and
collects data
2.7V
Does not report
Wakes up and
collects data
2.7V
Does not report
Wakes up and
collects data 2.7V
Does not report
Wakes up and
collects data
2.7V
Does not report
Wakes up and
collects data
REPORTS
2.7V
Wakes up and
collects data
2.8V
Does not report
Users push the button,
REPORTS 2.7V.
Recalculate MaxTime.

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6. Installation
8. Installation
1. Remove the 3M adhesive on the back of the3-axis
Accelerometer Sensor and attach the body to the surface of a
smooth object (please do not stick it to a rough surface to
prevent the device from falling off after a long time use).
Note：
Wipe the surface clean before installation to avoid dust on
the surface to affect the adhesion of the device.
Do not install the device in a metal shielded box or other
electrical equipment around it to avoid affecting the wireless
transmission of the device.
2. Installation Precautions：
While installing, it is recommended to install R311FA1
horizontal while the generator is power-off and in static status.
After installing and fixing R311FA1, please turn on the device.
After the device is joined, one minute later, R311FA1 would
perform the calibration of the device (the device cannot be
moved after the calibration. If it needs to be moved, the device
needs to be turned off/powered off for 1 minute, and then the
calibration would be performed again). R311FA1 would need
some time to gather the data of three-axis accelerometer & the
temperature of the generator while it is working normally. The
data is a reference for the settings of ActiveThreshold &
InActiveThreshold, it is also for checking if the generator is
working abnormally.
3-axis Accelerometer Sensor (R311FA1)
is suitable for the
following scenarios:
Industrial Equipment
Industrial Instrument
Medical Instruments
When it necessary to detect 3-axisthe acceleration and velocity
3.When R311FA1 detects the data of three-axis accelerometer
exceed ActiveThreshold, R311FA1 would report the data that
detected. After sending the data of three-axis accelerometer,
the data of three-axis accelerometer of the device needs to be
lower than InActiveThreshold and the duration has to be
more than 5 seconds (cannot be modified) before the next
detection.
Note：
While the data of three-axis accelerometer of the device
is lower than InActiveThreshold and the duration has to be
lesser than 5 seconds, at this time, if the vibration continues
(the data of three-axis accelerometer is higher than
InActiveThreshold ), it will be delayed for 5 seconds. Until
the data of three-axis accelerometer is lower than
InActiveThreshold, and the duration is more than 5
seconds.
R311FA1 would send two packets, one is the data of
three-axis accelerometer, and the other would be sent after
10 seconds with the data of three-axis velocity.

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7. Important Maintenance Instruction
Kindly pay attention to the following in order to achieve the best maintenance of the product:
• Keep the device dry. Rain, moisture, or any liquid might contain minerals and thus corrode electronic circuits. If the device gets
wet, please dry it completely.
• Do not use or store the device in dusty or dirty environment. It might damage its detachable parts and electronic components.
• Do not store the device underexcessive heat condition. High temperature can shorten thelife of electronicdevices, destroy batteries,
and deform or melt some plastic parts.
• Do not store the device in places that are too cold. 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. Rough handling of equipment can destroy internal circuit boards and delicate structures.
• Do not clean the device with strong chemicals, detergents or strong detergents.
• Do not apply the device with paint. Smudges might block in the device and affect the operation.
• Do not throw the battery into the fire, or the battery will explode. Damaged batteries may also explode.
All of the above applies to your device, battery and accessories. If any device is not working properly, please take it to the nearest
authorized service facility for repair.