Netvox wireless dry contact sensors - R718J can be used to detect contact between two wired contact points. This sensor can be used with an external mechanical switch or a contact plate to alert the user via APP when the contacts touch or a switch is triggered

Principle of Operation

The device can be connected to dry contact devices, such as various switches, buttons, and output of the reed switch. It can detect the closing or disconnecting signal of the dry contact. It uses the SX1276 wireless communication module.

Example Applications

Tamper switches
Barn door access monitoring
Freezer / cooler door access
Freezer / cooler doors (to determine if they are not closed all the way
Convenience store cooler doors (to determine if they are not closed all the way)
Forklift seat switches
Dry contact sensor

Features of NETVOX Sensors

• Wireless range of 10 km *

• LoRaWANTM Class A compatible

• Frequency Hopping Spread Spectrum (FHSS)

• Improved interference immunity

• Improved power management for longer battery life

• Encrypt-RF™ Security (Diffie-Hellman Key Exchange + AES-128 CBC for sensor data messages)

• Battery Life* :

5 years (Conditions: ambient temperature 25 °C, 20 triggers/day, txpower = 20dBm, LoRa spreading factor SF = 10)

• Over-the-air updates (future)

• Third-Party online wireless sensor monitoring and notification system to configure sensors, view data and set alerts via SMS text and email (optional)

• Available third-party platform: Actility/ThingPark, TTN, MyDevices/Cayenne

• R718X series carry magnets which can be attached to ferromagnetic materials and objects

*Actual range may vary depending on environment.

*Battery life is determined by sensor reporting frequency and other variables

Technical Specifications

Input Power	2 x 3.6V ER14505 AA lithium batteries
Sleeping Mode	22uA
Wake up Mode	6.3mA @ 3.3V
Low Voltage Threshold	3.2V
Tx Current	120mA/3.0V
Rx Current	11mA @3.0V

External Wire Specification

Wire material	UL2547 28AWG
Wire maximum temperature	80°C
Maximum outer diameter of the wire	2mm
Wire length	1000mm（±5mm）
Wire flame resistance rating	VW-1

Frequency

Tx Power	19dBm±1dBm
Rx Sensitivity	-136dBm (LoRa，Spreading Factor=12，Bit Rate=293bps ) -121dBm (FSK,Frequency deviation=5kHz, Bit Rate=1.2kbps)
Antenna Type	Build-in antenna
Communication Range	Build-in antenna
Data Transfer Rate	0.3kbps～50kbps
Spread Technique	LoRa/FSK
Available Frequency	EU863-870，US902-928，AU915-928， KR920-923，AS923，CN470-510 Configured before shipment

ADC Sampling Characteristic

ADC Sampling Voltage Range	0-5V
Resolution	12 digits
ADC Conversion Rate	1.14 Msps
External Cable Length	1m

Physical

Dimension	L:112mmW:65mmH:32mm
Weight	150g
Operating Temperature	-40℃ ～ 55℃
Environment Humidity Range	<90% RH (No condensation)
Storage Temperature	-40℃ ～ 85℃

Datasheet:

R718J.pdf

User manual:

R718J_UG.pdf

Battery Calculator:

Netvox Battery Calculator

Netvox LoRa Command Resolver:

LoRa Command Resolver

R718J - Netvox LoRaWan Wireless Dry Contact Interface