Bluetooth Relay Switch 2-Channel 20-Amp ProXR Lite

NextGen WiFi

Wi-Fi Relay Control (NexGen WiFi)

The NexGen WiFi module is NCD's second-generation Wi-Fi solution, built to make connecting and controlling relay boards easier than ever. It combines Wi-Fi, Bluetooth, USB, and MQTT into a single, modern communications module - so you can choose the connection method that works best for your application.

Setup is simple using the built-in Soft AP web interface, where you can enable or disable features, configure networking, and tailor the module to your needs - no extra software required.

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One Module. Multiple Ways to Connect.

WiFi Communications

Connect your controller directly to your network using standard TCP/IP communication. Configure DHCP or static IP settings, port numbers, and serial baud rates using the integrated web interface while in Soft AP mode.

Soft AP configuration works on phones, tablets, laptops, and desktops, making setup fast whether you're in the field or at your desk. Once configured, you can exit Soft AP mode and control relays through supported protocols or a basic built-in web control page.

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Bluetooth Communications

Prefer wireless without the network? NexGen WiFi also supports Bluetooth Classic using the Serial Port Profile (SPP). Your controller appears as a standard virtual COM port, allowing easy wireless communication with a PC.

Bluetooth name and PIN settings can be customized through the web interface.

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USB Communications

For direct, plug-and-play control, the NexGen WiFi module includes a USB port. It mounts as a virtual COM port, giving you reliable wired access using standard serial communication - perfect for setup, testing, or local control.

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Supported Communication Protocols

MQTT

The NexGen module supports lightweight MQTT messaging for remote control and monitoring. Configure basic authentication and define one publish and one subscribe topic using the web interface. Commands are received via the subscribe topic, with responses published back automatically.

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HTTP API

Send commands using simple HTTP requests - even from a web browser. This makes it easy to trigger relay actions or integrate with existing web-based tools and systems. Simply send the HTTP command to the IP address 192.168.1.10 in any web browser using the following command structure: 192.168.1.10/sendCommand?data:[254,108,1]

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Web Socket

For real-time communication, establish a WebSocket connection to the controller. Send commands as JSON arrays and receive responses in the same format, making it ideal for dashboards, web apps, and live interfaces.

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Discovery, Status & Diagnostics

Automatic Network Discovery

The NexGen module broadcasts UDP discovery packets, allowing tools like Base Station - and your own software - to quickly find devices on the network.

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RGB Status LED

An onboard RGB LED provides instant visual feedback for power, connectivity, and configuration states - making troubleshooting fast and intuitive.

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Time Sync (Taralist Controllers Only)

When used with compatible Taralist controllers, NexGen WiFi can automatically sync the onboard real-time clock using NTP. Time is updated daily over the internet to keep schedules accurate without manual adjustment.

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Compatibility & Requirements

• 2.4GHz Wi-Fi only (5GHz networks not supported)
• Compatible with Fusion series controllers
• Fully compatible with G2 revision boards (G2A, G2B, G2C, etc.)
• Not compatible with older, non-G2 relay boards due to power requirements

⚠️ Important: This WiFi module draws more power than older controllers can supply. Newly purchased controllers include the required power upgrades. Retrofitting older devices may require a power supply upgrade and service charge.

Please consult Relay Pros staff before attempting to retrofit older hardware.

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Why NexGen WiFi?

The NexGen WiFi module gives you Wi-Fi, Bluetooth, and USB connectivity in one low-cost solution, with flexible protocol support and an easy-to-use web interface. Whether you're experimenting, prototyping, or deploying a full automation system, NexGen WiFi lets you connect your way - without complexity.

NextGen Module Setup

Quick, Guided Configuration

The NextGen module combines WiFi, Bluetooth, USB, web control, and MQTT into one powerful communication solution. It includes a built-in web interface that makes configuration straightforward, even for first-time users.

Some setup is required to connect the module to your network and enable the features you want - but you don't have to figure it out alone.

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Simple Setup with a Step-by-Step Guide

When powered on in configuration mode, the NextGen module creates its own WiFi network. You connect using a phone or computer, open a web page, and follow the guided setup options to:

• Join your WiFi network
• Enable web relay control
• Set up Bluetooth or USB access
• Configure TCP or MQTT (optional)

Most users are up and running in just a few minutes.

After purchase, you'll have access to a Quick Start Guide that walks you through the process step-by-step with clear instructions and screenshots.

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Built for Flexibility

Whether you're using:

• WiFi for remote control
• Bluetooth for local access
• USB for direct connection
• Web pages for simple on/off control
• Or MQTT for automation

The NextGen module adapts to your application without requiring advanced networking knowledge.

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Need Help? We've Got You.

If you ever get stuck, NCD has a forum ready to help you through setup or answer any configuration questions.

The ProXR Lite SPDT 20-Amp Relay Board

Built for Reliability. Engineered for Simplicity

ProXR Lite Relay Design

The ProXR Lite series is machine-manufactured for consistent, high-precision performance. Every controller is fully tested before it leaves the production floor, ensuring dependable operation in tough environments - heat, cold, vibration, and everything in between. With thousands of units in the field worldwide, these boards have proven they can take a beating and keep on switching.

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ProXR Command Set

ProXR Firmware is one of the most feature-rich relay command sets available.
You get access to a huge library of functions, timers, parameters, and control options - all programmable in nearly any language. Prefer no-code? Software is available, too.
Find the full command set in the ProXR Quick Start Guide.

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Easy Software Development

Most customers write their own control programs, and the ProXR Lite makes that easy.
Because the board uses the Serial Port Profile, it mounts as a virtual COM port, allowing simple command-based control from nearly any programming language.
Not a programmer? N-Button Lite offers point-and-click relay control and status monitoring - no code required. Click Here for More

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Read Analog Sensors

Every ProXR Lite board includes an 8-Channel 8/10-Bit A/D Converter.
Monitor up to eight sensors from 0 - 5VDC (0V can be read from a simple contact closure). Use A/D inputs for:

• Switch status monitoring
• Variable resistance sensors
• Simple automation logic

Values return as 0 - 255.
See the AD8 Quick Start Guide for full A/D command documentation.

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Relay Activator and Analog Inputs

The Relay Activator control panel lets you use analog inputs to directly control onboard relays. Just connect buttons or switches to the analog inputs and trigger simple on/off actions for manual relay control. Each of the eight inputs can be assigned one of eight functions, including turning relays on or off, toggling relay states, flashing a relay momentarily, toggling the flash function, turning all relays on, turning all relays off, or generating push-notification events using N-Button Software. Click the gray Relay Logic tab and check out Example 6 to see how to wire a manual switch into your setup. Download the Relay Activator Quick Start Guide here: Relay Activator Quick Start Guide.

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SPDT Relay Installed

This MirC model is equipped with an SPDT (Single Pole, Double Throw) relay, giving you three connection points: Common (COM), Normally Open (NO), and Normally Closed (NC).

• When the relay is off, COM is connected to NC
• When the relay is energized, COM switches over to NO

This gives you flexibility to wire your load to either the Normally Open or Normally Closed contact depending on how you want the device to behave. Examples of wiring methods can be found in the gray Relay Logic tab.

The Common (COM) terminal is the moving contact inside the relay. When the coil energizes, it physically swings from NC to NO. Wiring is done directly to the relay using standard 1/4" quick-disconnect terminals. (Shown at right.)

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Amperage Rating

The installed relay is rated for 20 amps on the Normally Open (NO) contact and 10 amps on the Normally Closed (NC) contact.

⚠️ Best Practice:
For high-current loads, always use the Normally Open (NO) contact. The Normally Closed (NC) contact is limited to 10 amps and should only be used for lower-current applications.

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2 Million+ Cycles

ProXR relays are built for longevity - expect years of reliable operation and millions of mechanical cycles. Every board ships with a 5-year warranty and 30-day money-back guarantee.

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Not Expandable (By Design)

ProXR Lite keeps things simple.
Unlike the full ProXR Series, Lite boards do not support relay expansion. While the firmware still reports up to 256 potential relays, only the first 1, 2, 4, or 8 relays in Bank 1 are active depending on the model you choose.

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Break-A-Way Tabs for a Smaller Design

Need a smaller footprint? The ProXR Lite PCB includes Break-A-Way Tabs, allowing the board to fit into optional undrilled enclosures or tight-space installations.

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RoHS Compliant & Lead-Free

All ProXR Lite controllers are built with RoHS-compliant components and lead-free solder.

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5-Yeary Warranty & Guarantee

Every ProXR Lite controller is covered by:

• 5-Year Functional Warranty
• 30-Day Money-Back Guarantee

If you're not satisfied, send it back for a refund within 30 days. (Damage caused after delivery isn't covered.)

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Essential Power Requirements

Clean, regulated power is critical.
A stable 12VDC supply ensures both the relay coils and onboard firmware operate correctly. Unstable or noisy power can cause improper switching or communication issues.
We recommend the PWR12-US (120VAC → 12VDC @ 1.25A) or our international supply with interchangeable adapters.
Learn More

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Shipping

All boards ship directly from our Missouri facility. Each unit is built and tested at the time of order - please allow 3 - 5 days for production. We ship primarily through UPS, but we're happy to use FedEx or DHL for international orders when you provide your account number. Questions? Call us at 800-960-4287 or email sales@relaypros.com.

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Induction Suppression

One of the most important parts of relay control - yet the most commonly overlooked - is inductive load protection.

Anything with a magnetic coil (motors, solenoids, transformers, etc.) generates high-voltage "kickback" when switched. Without a suppression capacitor, that spike can:

• Shorten relay lifespan
• Cause electrical noise that disrupts the microcontroller
• Trigger unexpected shutdowns
• Require power cycling to restore communication

Adding an induction suppression capacitor protects your relay contacts and keeps everything running smoothly. Capacitors are available at checkout, and our Induction Suppression Page has wiring diagrams and more details.

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Base Station Software

Base Station is the fastest way to learn and control the ProXR Lite board. Explore every feature through an intuitive GUI while watching live data flow to and from the board.
Designed to work seamlessly with the entire family of communication modules, Base Station supports every feature the board offers - far beyond what other manufacturers provide. More on Base Station can be found in the Base Station tab.

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ProXR Lite Is Here!

A more streamlined manufacturing process brings a more durable, reliable and better relay board to the market.  Here's a lists of great features:

User Friendly Board Design
• Single Pole Double Throw Relays Installed
    - Wire to Normally Open or Normally Closed Position
    - Normally Open Rated 20-Amps
    - Normally Closed Rated 10-Amps
• Break-A-Way Tabs Lets you Decide the Board's Size
• Wire Directly to the Relay Using 1/4" Quick Disconnect Terminal
• RoHS Compliant

ProXR Lite Features
• Industry Leading ProXR Command Set
• 8-Channel 8/10-Bit Analog to Digital Converter
• Highly Reliable Board
• Assign up to 16 Programmable Timers

ProXR Lite Limitations
• This Board Cannot be Expanded

The ProXR Command Set

ProXR Firmware

The firmware on the Ethernet Relay board supports the ProXR Command Set, offering more commands and functionality than any other relay board on the market! The list of available commands and parameters is extensive, giving you full control. You can write your own control program in almost any programming language.

Key Features

• Extensive Command Set: More commands and functionality than any other relay board.
• Programming Flexibility: Compatible with nearly any programming language.
• User-Friendly Software: Free software available for non-programmers to easily control relays without coding.

Introduction

The ProXR Series Controllers allow you to control up to 2048 relays depending on your controller model.  Relays are divided into groups of 8 called banks, and are addressed by their bank number.  For instance, a ProXR series controller with 32 on-board relays has four on-board banks, the on-board relays respond to bank values of 1-4.  If you use the XR Expansion port to add another bank of 24 relays, then you will need to specify bank values of 5-7 to control the extra relays.  The firmware doesn’t actually know how many relays are attached to the relay controller, it is up to the user to define how many relays are attached to the controller using Base Station Software.  The ProXR CPU will assume you have connected the maximum number of supported relays to your controller.  In the ProXR Quick Start Guide, you will see two commands that appear to do the same thing, for example:

  254 0-7 Turn Off Individual Relays
  254 100-107 Bank# Turn Off Individual Relays in Bank
  254 8-15 Turn On Individual Relays
  254 108-115 Turn On Individual Relays in Bank
  254 16-23 Get the Status of an Individual Relay
  254 116-123 Bank# Get the Status of an Individual Relay in Bank
While the outcome is the same, these commands function in slightly different ways.

For instance:
  254 8 Turn On Relay 1
To make this command work, you will send a 254, then a 8 to activate a relay. By default, relay bank 1 will be affected by this command. However, you can redirect this command to a different relay bank using the following command:
  254 49 2  Direct Commands to Relay Bank 2
Then you can send:
  254 8 Turn On Relay 1 in Bank 2

Here are a few more Bank Specified Examples:
  254 49 1 Direct Commands to Relay Bank 1
  254 8 Turn On Relay 1 in Bank 1
  254 49 2 Direct Commands to Relay Bank 2
  254 8 Turn On Relay 1 in Bank 2
  254 9 Turn On Relay 2 in Bank 2
  254 10 Turn On Relay 3 in Bank 2
  254 49 3 Direct Commands to Relay Bank 3
  254 8 Turn On Relay 1 in Bank 3
  254 11 Turn On Relay 4 in Bank 3
  254 12 Turn On Relay 5 in Bank 3
  254 13 Turn On Relay 6 in Bank 3
  254 14 Turn On Relay 7 in Bank 3
  254 49 0 Direct Commands to All Relay Banks
  254 8 Turn On Relay 1 in All Relay Banks

This command structure has the advantage of being very fast and efficient. However, if power to the controller is ever lost, commands will automatically be directed to bank 1 when power to the controller has been restored. This command methodology is generally advisable for ProXR controllers with 8 or fewer relays. When working with more than 8 relays, we generally advise users to use Bank Directed commands as shown in the following examples.

Turns Off Relays in the Currently Selected Relay Bank

This command will control the Off status of specified relays in the Currently Selected Relay Bank.  This command has optional parameters <1-7> for controlling the Off status of the remaining relays, 1 being the next relay in sequence, 2-7 being all possible subsequent relays in the selected relay bank.  A value of 0 refers to the first relay in the specified relay bank, 7 being the 8th and final relay of the selected Relay Bank. This command sends byte value 85 back to the user when the operation has been completed.

Send Bytes:	Byte 1:	Byte 2:	Byte 3:
Function:	Command	Command	Optional Parameters
Decimal Values:	254	0-7	1-7
Hex Values	0xFE	0x00 - 0x07	0x01 - 0x07
Receive Byte:	Decimal:	85
	Hex:	0x55

Turns On Relays in the Currently Selected Relay Bank

This command will control the On status of specified relays in the Currently Selected Relay Bank.  This command has optional parameters <1-7> for controlling the On status of the remaining relays, 1 being the next relay in sequence, 2-7 being all possible subsequent relays in the selected relay bank.  A value of 0 refers to the first relay in the specified relay bank, 7 being the 8th and final relay of the selected Relay Bank.  This command sends byte value 85 back to the user when the operation has been completed.

Send Bytes:	Byte 1:	Byte 2:	Byte 3:
Function:	Command	Command	Optional Parameters
Decimal Values:	254	8-15	1-7
Hex Values	0xFE	0x08 - 0x0F	0x01 - 0x07
Receive Byte:	Decimal:	85
	Hex:	0x55

Read the Status of Relays in the Currently Selected Relay Bank

This command will report the On/Off status of Relays 0-7 in the Currently Selected Relay Bank.  This command sends byte value of 0 of 1 back to the user when the operation has been completed, 0 reporting an Off status and 1 reporting an On status.

Send Bytes:	Byte 1:	Byte 2:
Function:	Command	Command
Decimal Values:	254	16-23
Hex Values	0xFE	0x10 - 0x17
Receive Byte:	Decimal:	0 or 1
	Hex:	0x00 or 0x01

Full Command Set

These are only a few examples from the ProXR Command set so you can get an idea of the command structure.  Download the ProXR Quick Start Guide to view the full command set ProXR Quick Start Guide.

Base Station Software

Base Station Software was designed to help you learn the ProXR command set!  No other relay board manufacturer even comes close to offering this type of software!  Explore ProXR features using it's Graphical User Interface.  Watch data bytes flow to and from the board, so you easily understand the command execution process.  There is no faster or easier way to learn how to automate than Base Station, as it was designed to work with all the communication modules we offer!  You only need a Windows 8 or 10 Computer to Run Base Station. 

Base Station Features

There are some useful features to look for when using Base Station Software to control, test, or configure your device:

• At the bottom left corner of each window there is a link to relevant documentation for your device
• In the Control Command Set Window, and many others, there is a MORE or LESS option at the top right corner.  Selecting MORE allows you to view specific communication details.
• All the functions of the command set are available as a point-and-click interface plus you can see the command that is being sent to the board!

The AD8 Command Set

"This isn't just a relay board - it's a control system."

Reading Switches/Variable Resistance Signals

This controller includes eight channels of 8/10-bit Analog-to-Digital Converters capable of reading 0 - 5V DC signals. The ADCs allow you to monitor external sensors or detect contact-closure inputs. Connect temperature sensors, light sensors, current sensors, buttons, switches, or any device that outputs a 0 - 5V signal or simple contact closure.

• With 8-bit resolution, inputs convert 0 - 5V into values from 0 to 255
• With 10-bit resolution, values range from 0 to 1023

Resolution is software-selectable. Request an analog value from the controller and it responds instantly.

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A/D Inputs

All ProXR Lite boards and ProXR boards that begin with ZADR or ZADSR include an onboard 8-channel Analog-to-Digital converter in addition to relay control. Each channel accepts a 0-5V DC input and converts it into a numeric value for processing.

Using the AD8 Command Set, analog voltages are translated into digital values (8- or 10-bit resolution, depending on configuration), making it easy to monitor and act on sensor data from a wide range of devices.

Each analog input can be configured to turn relays ON or OFF, toggle relay states, flash relays, enable or disable flashing, send push-notification data, and more - all based on live input values read in real time.

As shown in the graphic, ProXR AD8 controllers are available with multiple analog input connector options. One of the connector styles shown corresponds to the specific board you are viewing, allowing you to quickly identify how sensors will physically connect. All analog inputs share a common ground, simplifying wiring and making it easy to connect multiple sensors to a single controller.

Once connected, A/D input values can be used consistently across N-Button and Base Station software for automation, relay control, monitoring, and diagnostics. This unified approach ensures predictable behavior from hardware to software, whether you are building a simple monitoring system or a fully automated control solution.

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Analog Inputs Controlling Relays

ProXR AD8 relay controllers allow analog inputs to directly control onboard relays using the same A/D input data used by N-Button and Base Station software (see Relay Activator section below). This makes it easy to monitor sensor values, automate relay behavior, and visualize input data across all supported software tools.

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Analog to Digital Connections

AD8 controllers are designed for stable sensor and switch monitoring. A/D inputs should never be left floating - each input must connect to a voltage or ground.

A built-in 10K pull-up/pull-down resistor (jumper-selectable) ties each input to +5V or ground to prevent floating conditions. While this resistor adds slight loading, the improved stability far outweighs any minor interference.

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AD8 Command Set

The AD8 Command Set reads analog voltages using the controller's 8-channel 8/10-bit ADC.

• 8-bit mode: Converts 0 - 5V to values from 0 to 255
• 10-bit mode: Converts 0 - 5V to values from 0 to 1023

Because 10-bit values transmit as two bytes (MSB and LSB), reconstruct the full reading using: 10BitValue = (MSB - 256) + LSB

Reads the 8-Bit Analog Input of Channels

This command will read the Analog Input of Channels 1-8 and return an 8-bit value for each.

Send Bytes:	Byte 1:	Byte 2:
Function:	Command	Parameter (Channel 1-8)
Decimal Values:	254	150-157
Hex Values	0xFE	0x96 - 0x9D
Receive Byte:	Decimal:	0-255
	Hex:	0x00-0xFF

These are just a few examples from the AD8 Command Set to help illustrate the command structure. For the complete list of commands, download the AD Quick Start Guide.

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View A/D Input Data in Real Time

Base Station software allows you to read all analog inputs in real time while clearly displaying the exact command data being sent to and from the controller. In the example shown, all eight A/D input channels are read simultaneously and displayed as live numeric values along with a real-time graph, making it easy to visualize how each input changes over time.

Because Base Station shows the actual commands used to read the A/D inputs, it becomes an invaluable learning and diagnostic tool. You can see precisely how input values are requested, returned, and interpreted by the controller, then copy those commands directly into your own applications or custom software. This dramatically simplifies development, testing, and troubleshooting when integrating A/D inputs into larger systems.

Whether you are validating sensor behavior, monitoring multiple inputs at once, or building your own custom control software, Base Station gives you clear visibility into both the data and the communication behind it.

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Relay Activator

Relay Activator and Analog Inputs

Base Station Software's Relay Activator is ideal for applications that primarily rely on computer control but still require occasional manual operation. By connecting external buttons or switches, you can take direct, hands-on control of any relay without giving up software-based control.

This creates true bi-directional control. For example, a relay can be turned ON through the computer interface and later turned OFF using a physical switch - or vice versa. Whether you're testing, troubleshooting, or building a hybrid manual/software-controlled system, Relay Activator keeps everything synchronized and predictable.

As shown in the example, each input includes a pull-down menu that allows you to select exactly how that input will control a relay. This makes configuration fast and intuitive - simply choose the desired action for each input without writing any code.

Each of the 8 input channels can be configured to control relays 1 through 8, with multiple action types available. This flexibility allows every input to perform exactly the function your application requires.

This level of control makes Relay Activator perfect for operator panels, test benches, safety overrides, and any application where manual interaction and software automation need to work together seamlessly.
AD8 Relay Activator Quick Start Guide.

Available Relay Actions per Input
Each input can be assigned one of the following actions:

• Momentary Control - Activates the relay only while the input is engaged
• Toggle Relay State - Alternates the relay between ON and OFF
• Turn Relay ON - Forces the relay into the ON state
• Turn Relay OFF - Forces the relay into the OFF state
• Flash Relay (Momentary) - Pulses the relay while the input is active
• Flash Relay (Toggle) - Toggles flashing behavior ON and OFF

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N-Button Software

Using A/D Inputs with N-Button

N-Button Lite and Pro support powerful A/D Input Automation rules that allow you to automatically control relays based on analog input levels. Simply define a voltage threshold or range, and N-Button will energize or de-energize relays as conditions change.

N-Button also supports Send Email and Text Message actions (Push Notifications), enabling automatic alerts when an A/D input reaches a specific level or falls within a defined range. Relay control and notifications can work together seamlessly, all driven by live A/D input data.

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Works Seamlessly with N-Button Software

Each A/D channel supports industry-standard 0-5V inputs, making it simple to integrate a wide range of sensors without extra hardware. Using N-Button, you can:

• Build desktop meters that show real-time sensor data
• Create dashboards with multiple sensor feeds
• Trigger Push Notification alerts from A/D thresholds
• Control relays based on sensor conditions - no programming required

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Using the Input Information

N-Button allows you to use A/D input values in multiple ways without writing code. Numeric values or value ranges can be used to:

• Trigger text or email alerts when thresholds are exceeded
• Control individual relays or banks of relays
• Display live readings on customizable desktop meters

For example, when an input value rises above 125, a relay can automatically energize or a notification can be sent. You can also define a valid operating range where a relay remains on, and automatically turns off if the value moves above or below that range.

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Control Relays with A/D Inputs

N-Button Lite/Pro software makes it incredibly easy to automate relay control using A/D input levels from this board. Simply create an Automation rule that links any A/D input channel to any relay channel. When the input voltage reaches the threshold you define, the relay energizes (turns on). When the input drops below that threshold, the relay de-energizes (turns off). No programming required.

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Precision + Performance

High-resolution readings ensure accurate measurements, even in demanding environments. Stream live data or automate actions based on your input thresholds.

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Create Desktop Meters

N-Button software lets you build live desktop meters that display real-time readings from the AD8 inputs, giving you constant visibility of your sensor data right on your screen. In the example shown, a "Live Soil Moisture Reading" meter provides instant feedback on soil conditions. Right below the meter, Relay 1 and Relay 2 buttons allow you to manually control relays directly from your desktop, or see their current status at a glance - the buttons change color to indicate whether a relay is on or off, giving you a complete view of your system in real time.

Each meter can be individually labeled, like the "Soil Moisture" label shown, making it easy to identify each sensor at a glance. Meter increments are fully customizable - the "Customizable Increments" callout shows how you can adjust the scale to match your application, whether you need fine-grained precision or a broader overview.

N-Button also allows you to arrange multiple meters on your desktop, creating a personalized dashboard that updates in real time. This makes it simple to compare different sensors side by side, spot trends, and react quickly if readings go outside expected ranges (unless you have the relays set automatically). Whether you're monitoring a single sensor or a full set of eight, N-Button makes live data monitoring intuitive and actionable.

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Push Notification

N-Button software also includes a powerful point-and-click messaging system that sends alerts to the recipients you choose. Because N-Button runs on your PC, it can automatically deliver text messages and/or emails directly from your computer.

Send SMS and email alerts when voltage levels are reached. Customize the subject and message to identify exactly what triggered the alert. You can even set repeat notifications at a defined interval until the input level returns to normal.
Visit our N-Button Page

Power & More

20/30 Amp Relay Board Specifications

This table highlights performance ratings for all NCD controllers equipped with 20A or 30A relays, based on 12VDC operation at 70°F (21°C). Most values are estimated and may be refined over time. Some ratings reflect standard factory settings before any performance optimizations are applied.

SPDT Relay Specs

Specs of NCD SPDT Relay Boards	Minimum	Nominal	Maximum	Notes
Operational Voltages	10VDC	12VDC	15VDC
Standby Power Consumption	35mA	100mA	200mA	No Active Relays, No Com Module
Relay Power Consumption	28mA	35mA	60mA	Consumption of Each Activated Relay
Operational Temperature Range	-40°F (-40°C)	70°F (21°C)	185°F (85°C)	Theoretical Component Limits Shown
Storage Temperature Range	-67°F (-55°C)	70°F (21°C)	185°F (85°C)	Theoretical Component Limits Shown
Operational Ambient Air Humidity	0%	50%	70%	Non-Condensing Humidity Values Shown
Relay Activation Time			15ms	Needs Further Validation
Relay Deactivation Time			10mS	Needs Further Validation
Operational Life Mechanical	10,000,000			Component Operation Rating
Operational Life Electrical	100,000			Component Rating at Maximum Load

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Communication Modules

Communication Module Specifications

This table provides a quick, clear overview of all NCD Communication Modules. While each module operates at 3.3VDC, the values shown here reflect the impact on a 12VDC master controller at 70°F (21°C). Use the maximum ratings for power-budget planning - they represent short-term peak consumption and may include estimated values that are updated as modules evolve.

Communication Module Power Consumption

Specs of NCD Communication Modules	Minimum	Nominal	Maximum	Notes
Operational Temperature Range	-40°F (-40°C)	70°F (21°C)	185°F (85°C)	Theoretical Component Limits Shown
Storage Temperature Range	-67°F (-55°C)	70°F (21°C)	185°F (85°C)	Theoretical Component Limits Shown
Operational Ambient Air Humidity	0%	50%	70%	Non-Condensing Humidity Values Shown
USB Module Power Consumption	N/A	N/A	N/A	USB Modules are Powered by the USB Port Do Not Consume Device Current
RS-232 Module Power Consumption		10mA	20mA
Ethernet Module Power Consumption	58mA	82mA	100mA
WiFi Bluetooth USB Module Power Consumption	37mA	50mA	100mA	Up to 300 Foot Indoor Wireless Range, Unobstructed. Up to 50 Foot Range Through Walls
900MHz Wireless Module Power Consumption	13mA	30mA	50mA	Up to 1,000 Foot Indoor Wireless Range, up to 2 Mile Outdoor Wireless Range using Included Antennas. Up to 28 Miles Outdoor Wireless Range using High-Gain Antennas.
KFX Wireless Key Fob	11mA	15mA	25mA	Up to 200 Feet Outdoor Wireless Range using 1, 2, 3, 4, or 5 Button Key Fobs. Up to 700 Feet Outdoor Wireless Range using 8-Button Remotes

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A/D Inputs

AD8 Analog Input Usage Notice

Analog inputs should never have voltage applied when the controller is powered down. If your application requires voltage to remain on an input, add a 220-ohm current-limiting resistor to each channel to protect the controller from damage.
Keep all analog inputs within the 0 - 5VDC range - exceeding this limit can permanently damage the on-board CPU. Most inputs include a 10K pull-up or pull-down resistor to keep the line stable when unused, but note that this resistor may introduce a slight bias in readings for certain sensors.

Software Options

Not a programmer and these boards look intimidating? Don't worry. Powerful software tools make it easy to get connected, discover attached devices, monitor inputs in real time, and control relays without writing a single line of code. Create on-screen buttons, desktop meters, timed events, and automated actions that respond to inputs, schedules, or system conditions - all from an intuitive graphical interface.

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Base Station Software

Compatible with ALL Boards on This Site

Base Station is a free software download that works by talking directly to your controller to identify the model, then automatically loads the correct graphical interface for controlling and testing that device. It's a great way to learn how any NCD controller works and doubles as a powerful diagnostic tool to verify your device is operating as designed.

Base Station exercises every supported feature on every supported device. For learning, testing, and troubleshooting NCD boards, this is the ultimate reference tool.

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User Interface

Base Station gives you a list of command sets supported by your controller. Just click any item once to open the custom graphical interface that was created alongside the firmware. Each command set corresponds with a module installed inside your device."

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Device Identification

Click the Device Identification window to view important read-only info about your controller.

Watch for the field labeled "Documentation Related to this Controller" - it's a complete list of articles connected to your device. Click any entry to open it. (Internet required.)

All devices released in 2012 and later support Device Identification.

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Device Command Sets

Base Station asks the controller which command sets it supports, then displays them when the software launches. Some devices show more command sets, others fewer - it's always based on the board.

ProXR users can access the entire ProXR Command Set to turn relays on/off and run every available function.

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Control All ProXR Functions

Turn relays on or off, read relay status, monitor inputs - Base Station gives full ProXR control through a clean point-and-click interface.

For programmers, Base Station also shows every command being sent to the board, making it a great tool for learning and development.

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Useful Features

There are some useful features to look for when using Base Station Software to control, test, or configure your device:

• Links to Quick Start Guides and documentation
• Discovery of network devices with IP address display
• Command Set Window for viewing raw commands (especially helpful for ProXR users)
• Relay Activator with Analog Inputs

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N-Button Lite - Full Relay Control

Relay Software

N-Button Lite is third-party software (sold separately) that gives you full relay control and real-time A/D input monitoring without writing a single line of code. It may look simple at first glance, but don't let that fool you - this is a surprisingly powerful tool with a wide range of real-world applications.

Create desktop buttons and meters, monitor live input values, and control relays instantly - all from an intuitive point-and-click interface.

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Create Buttons & Widgets

N-Button Lite/Pro lets you build floating desktop widgets that can:

• Control relays and read inputss
• Create buttons to control relays
• Read A/D inputs
• Create live meters from inputs
• Launch applications

It supports Serial/USB and Network connections, and you can even access your widgets remotely. Most actions are point-and-click - no programming required.
N-Button also includes special widgets designed specifically for the boards on this site.

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Lite vs. Pro

N-Button Lite includes the same buttons and widgets as the Pro version, but is limited to 16 total widgets. It's ideal for maller projects or cost-conscious applications where you still want full functionality. If your project grows, N-Button Pro removes the limit and supports up to 255 widgets.

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USB and Network Compatible

N-Button Lite works over Serial/USB or Network connections between your computer and the relay board. Add or modify widgets easily using N-Button Lite Manager to create the exact look and behavior you want. N-Button Lite supports this relay board and any ProXR Relay board with up to 16-widgets.

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Control Multiple Boards

N-Button Lite software can control multiple devices connected to the same computer or network, allowing you to manage relays, inputs, meters, and automation across several boards from a single interface. Use the built-in Device Manager to easily add, remove, or modify boards and maintain a clear list of all connected devices. Each device is handled independently, making it easy to build scalable systems without adding complexity.
For example, a single PC can monitor A/D inputs on one board while controlling relays on multiple network-connected boards.

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Time Control Software

We offer two timer software options to support different types of automation needs: Relay Timer and Quick Timer. Relay Timer is designed for time-of-day scheduling, allowing relays to turn on and off automatically based on the computer's clock - ideal for daily routines and long-term automation. Quick Timer focuses on duration-based control, running relay sequences for a defined length of time that you manually start, making it well suited for test cycles, timed processes, and repeatable sequences.

Choose the timer that best matches whether your application depends on when an action occurs or how long it runs.

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Relay Timer

Time Schedule Control

Relay Timer is third-party software (sold separately) that works with all ProXR and ProXR Lite relay controllers and supports every available interface - USB, wired, wireless, and network. No matter how your board is connected, Relay Timer communicates seamlessly to deliver reliable, scheduled relay control.

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Precision Scheduling Using Your Computer's Clock

Relay Timer uses the computer's system clock to maintain accurate, drift-free timing. This ensures relay actions stay perfectly synchronized with other applications running on the same machine, such as time clocks or automation software.

A high-resolution timing engine - similar to those used in multimedia applications - provides timing accuracy down to 5 - 10 milliseconds, making Relay Timer well suited for real-time and precision-based control tasks.

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High-Speed, Multi-Relay Control

Relay Timer can update up to eight relays simultaneously using the ProXR and ProXR Lite communication protocol. When speed matters, all eight relays can be updated in approximately 30 milliseconds.

In multi-relay applications, Relay Timer calculates the state of all relays together, even though each relay operates independently. This ensures fast, coordinated, and predictable behavior across complex schedules.

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Take Manual Control

At any time, you can manually take control of a relay to interrupt the active schedule. Resume automatic operation instantly or set a specific time for the software to return to scheduled control - ideal for maintenance, testing, or temporary overrides such as school bells for assemblies.

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Quick Timer

Compatible with ProXR & ProXR Lite Boards

Quick Timer is third-party software (sold separately) that works with all ProXR and ProXR Lite relay controllers and supports every available interface, including USB, wired, wireless, and network connections. The software automatically communicates with your board regardless of how it's connected, making setup quick and straightforward. Designed for responsive, duration-based control, Quick Timer delivers fast, reliable relay operation for timed sequences, test cycles, and repeatable automation tasks.

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Duration-Based Relay Control (Not Time-of-Day Scheduling)

Quick Timer is designed for applications where how long a relay is energized matters more than what time of day it activates. Instead of using the computer's clock, Quick Timer runs sequences based on a defined time duration.

A sequence is manually started and can:

• Run once and stop automatically, or
• Loop continuously until manually stopped

This makes Quick Timer ideal for test cycles, timed processes, burn-in testing, and repeatable automation routines.

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Flexible Time Sequences Within a Single Duration

Quick Timer allows you to define a total run duration first. Within that duration, each relay can follow its own independent on/off timing pattern.

Example: 30-Second Sequence

• Relay 1 turns on for 5 seconds, then off for 5 seconds
• Relay 2 turns off for 5 seconds, then on for 5 seconds
• Relay 3 turns on for the first 10 seconds, then off for 20 seconds
• Relay 4 remains off for 10 seconds, then turns on for 20 seconds

All relay actions are calculated and executed automatically within the defined time window.

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Independent Control Per Relay

Each relay can be configured with its own timing behavior while remaining synchronized within the overall sequence duration. This allows complex, coordinated relay patterns without requiring scripting or programming.

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Manual Override at Any Time

Manual control is always available. Interrupt the active sequence to toggle any relay as needed, then return to automatic operation immediately or at a user-defined time.

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Built for Real-World Reliability

Quick Timer is designed to handle real-world operating conditions, including communication interruptions, power loss, and system instability. Rather than assuming perfect conditions, the software focuses on predictable behavior and clear user control when issues occur.

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Time Travel

Fast-Forward Time for Testing & Automation

Time Travel software answers the age-old question of time travel - at least for your PC. This free utility lets you override and accelerate your computer's clock, making it easy to test time-based automation without waiting in real time. Time Travel is included with Relay Timer, Quick Timer, and N-Button software and is also available as a free standalone download.

Instead of waiting hours or days to verify schedules, you can fast-forward time and confirm relay behavior in seconds - saving time, frustration, and repeated test cycles.

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Make Time Run Faster

Time Travel can temporarily override your computer's system clock and adjust how fast time runs. Increase the clock speed to simulate long periods instantly - for example, at 3600x speed, a full day passes in just 24 seconds.

This makes it easy to validate schedules, sequences, and automation logic without waiting for real-world time to pass.

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Ideal for Bench Testing & Development

Time Travel is especially useful for testing any software that relies on the computer's clock, including:

• Relay Timer
• Quick Timer
• N-Button
• Other scheduling or automation applications

It provides a fast, controlled way to confirm timing behavior before deploying systems in the field.

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Presets & Automatic Time Recovery

Time Travel includes preset configurations that allow you to load saved time and speed settings quickly. Users can create, save, and export presets for future use, and the software remembers the last configuration when restarted.

To protect your system, Time Travel automatically restores the computer's clock to the correct local time when the program exits. The system time is only affected while the software is running.

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Simple to Use

Using ime Travel is straightforward:

• Download and unzip the software
• Run TimeTravel.exe as Administrator

Key functions include:

• Current Running Speed - Adjusts how fast the computer clock runs
• Set Time - Changes the computer clock to a specific date and time
• Resume From Last Shutdown Time - Restarts from the last simulated computer time if the system shut down unexpectedly
• Sync with Real Time - Returns the clock to real-time operation (when speed is set to 1x)

When you exit the program, your computer clock is automatically restored to the current local time.

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Component Library

Visual Studio Samples

The NCD Component Library is a plug-in for the Visual Studio 2005/2008 that greatly simplifies the communications to the NCD product line.  The samples can be run in Visual Studio and fully customizable to your needs.  Over 40 fully functional fully working samples are included in this free download. 

Visit our Component Library Page to view all the samples available.

Data Sheets & Quick Start Guides

Below are the Data Sheets and Quick Start Guides for this board.  These are the guides that will help you communicate and configure this board.