netvox R718KA Wireless mA Current Meter Interface 4-20 mA User Manual

: June 9, 2024
: netvox

Table of Contents

Introduction
Appearance
Main Features
Set up Instruction
Data Report
Installation
Information about Battery Passivation
Important Maintenance Instruction
References
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netvox R718KA Wireless mA Current Meter Interface 4-20 mA

Introduction

R718KA is a current detection device for Netvox Class A type devices based on LoRaWAN open protocol.
The device is suitable for detecting 4mA to 20mA current, and R718KA is compatible with LoRaWAN protocol.

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.

Appearance

Main Features

Compatible with LoRaWAN
Simple operation and setting
2 ER14505 lithium batteries in parallel power supply (3.6V / section)
IP Rating: IP65
4mA to 20mA current meter interface
Compatible with LoRaWANTM Class A
The base is attached with a magnet that can be attached to a ferromagnetic material object
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

Battery Life:

Please refer to web: http://www.netvox.com.tw/electric/electric_calc.html
At this website, users can find battery life time for variety 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 till green indicator flashes 20 times.
Power off| Remove Batteries.
Note:| 1. Remove and insert the battery; the device is at off state by default. Turn on the device to use again.

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

3. 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 to join. The green indicator stays on for 5 seconds: success

The green indicator remains off: fail

---|---

Had joined the network (not at factory setting)

| Turn on the device to search the previous network to join. 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 for 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

Data Report

After power on, the device will immediately send a version packet report and an attribute packet report.
The device sends data according to the default configuration before any other configuring.

Default Setting:
Maximum time: 900s (15min)
Minimum time: 900s (15min)
Battery Change: 0x01 (0.1V)
Current Chang: 0x02 (2mA)

Note:

The cycle of the device sending the data report is according to the default.
The interval between two reports must be the MinTime
If there is special customized shipment, the setting shall be changed according to customer requirements

Please refer Netvox LoRaWAN Application Command document and Netvox Lora Command Resolver http://www.netvox.com.cn:8888/page/index to resolve uplink data.

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

Example of ReportDataCmd

FPort：0x06

Bytes	1	1	1	Var(Fix=8 Bytes)
	Version	Device Type	Report Type	Netvox Pay Load Data

Version– 1 byte –0x01——the Version of NetvoxLoRaWAN Application Command Version
Device Type– 1 byte – Device Type of Device
The device type is listed in Netvox LoRaWAN Application Device type doc
Report Type – 1 byte –the presentation of the Netvox Pay Load Data, according the device type Netvox Pay Load Data– Fixed bytes (Fixed =8bytes)

Device| Device

Type

| Report

Type

| NetvoxPayLoadData
---|---|---|---
R718KA| 0x22| 0x01| Battery (1Byte)

unit:0.1V

| Current (1Byte)

unit:1mA

| FineCurrent (1Byte)

unit:0.1mA

| Reserved (5Bytes)

fixed 0x00

Uplink: 01220123074E0000000000

Byte	Value	Attribute	Result	Resolution
1st	01	Version	1	–
2nd	22	DeviceType	22	–
3rd	01	ReportType	1	–
4th	23	Battery	3.5v	23(HEX)=35(DEC),35*0.1v=3.5v
5th	07	Current	7mA	07(HEX)=7(DEC),7*1mA=7mA
6th	4E	FineCurrent	7.8mA	4E(HEX)=78(DEC),78*0.1mA=7.8mA
7th~11th	0000000000	Reserved	0	–

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)

Description| Device| Cmd

ID

| Device

Type

| NetvoxPayLoadData
---|---|---|---|---
Config ReportReq| R718KA| 0x01| 0x22| MinTime (2bytes Unit:s)| MaxTime (2bytes Unit:s)| BatteryChange (1byte Unit:0.1v)| CurrentChange (1byte Unit:1mA)| Reserved (3Bytes,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)| CurrentChange (1byte Unit:1mA)| Reserved (3Bytes,Fixed

0x00)

Configure the device parameter MinTime = 1min, MaxTime = 1min, BatteryChange = 0.1v, CurrentChange= 10mA
Downlink: 0122003C003C01A000000
Device Return:
8122000000000000000000 (configuration success)
8122010000000000000000 (configuration failure)
Read the device parameter
Downlink: 0222000000000000000000
Device Return:
8222003C003C010A000000 (device current parameter)

Example for MinTime/MaxTime logic

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

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
Example for MinTime/MaxTime logic

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

Notes:

The device only wakes up and performs data sampling according to MinTime Interval. When it is on sleeping mode, it does not collect data.
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.
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.
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

Wireless Current Meter Interface (R718KA) has the built-in magnet (as the figure below). When installed, it can be attached to the surface of an object with iron which is convenient and quick.
To make the installation more secure, use screws (purchased) to secure the unit to a wall or other surface (as the figure below , the installation diagram of R718A is taken as an example because the main body has the same appearance).
Note:
Do not install the device in a metal shielded box or in an environment with other electrical equipment around it to avoid affecting the wireless transmission of the device.
Connect the sampling line of the current meter interface sensor to the transmitter according to the wiring method shown in figure. There are two connection modes, 2-wire and 3-wire.
When the ADC sampling interface sensor detects the current voltage according to the configured time or by pressing the button, it sends the data immediately

Wireless Current Meter Interface (R718KA)
It can also be applied to the following scenarios:

Pressure transmitter
Differential pressure transmitter
Level transmitter
Flow transmitter
The transmitter with 4-20mA output signal

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 it is suggested that if the storage period is more than one month from the date of battery production, all the batteries should be activated.

If encountering the situation of battery passivation, users can activate the battery to eliminate the battery hysteresis.

ER14505 Battery Passivation:

To determine whether a battery requires activation

Connect a new ER14505 battery to a 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

a. Connect a battery to a resistor in parallel
b. Keep the connection for 5~8 minutes
c. The voltage of the circuit should be ≧3.3, indicating successful activation.
Brand| Load Resistance| Activation Time| Activation Current
---|---|---|---
NHTONE| 165 Ω| 5 minutes| 20mA
RAMWAY| 67 Ω| 8 minutes| 50mA
EVE| 67 Ω| 8 minutes| 50mA
SAFT| 67 Ω| 8 minutes| 50mA

Note:
If you buy batteries from other than the above four manufacturers, then the battery activation time, activation current, and required load resistance shall be mainly subject to the announcement of each manufacturer.

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 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.

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.