The ProXR Lite SPDT Relay Board

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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No Break-A-Way Tabs

This board DOES NOT have Break-A-Way tabs.  When the blank board stock was manufactured the scoring for the tabs was not done.  All other functions of this ProXR Lite board remain the same.  It just can't be made smaller.  NCD made a few of these before noticing the scoring was not done.  They offered these boards to us at a discounted price of $40 off, if you don't need a smaller footprint this board is a great option.

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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

SPDT (Single Pole Double Throw) relays include three terminals: 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 to NO.

Your load can be wired to either the NO or NC terminal depending on whether you want the device to turn on when the relay activates or when it releases. Examples of wiring methods can be found in the gray Relay Logic tab.

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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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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 2 - 3 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

Inductive loads - motors, solenoids, transformers - generate high-voltage spikes.
Each relay controlling an inductive load must use an induction-suppression capacitor. Without it:

• Relay life is significantly reduced
• High-voltage feedback can disrupt logic and shut down relay banks

See our Induction Suppression Video Video for guidance.

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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 at a Glance

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
• Break-A-Way Tabs Lets you Decide the Board's Size
• Screw Terminal Contact Closure/Relay Connections
• 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
• Not expandable (fixed relay count)

Gen3 Ethernet Relay

R810CP_ETHERNET - Next-Generation Ethernet Relay Control

Meet the NCD5500 Ethernet-to-Serial Converter, NCD's 3rd-generation Ethernet module designed for exceptional reliability, ease of use, and lower cost. This modular interface brings the entire line of NCD Industrial Devices onto your Ethernet network with plug-and-play simplicity.

Built on NCD's next-generation Ethernet-to-Serial platform, the NCD5500 is customized specifically for NCD controllers to ensure full compatibility across our product families, including ProXR, ProXR Lite, Reactor, and Taralist boards. The module converts TCP/IP data into serial bytes and routes them directly to your controller via standard serial communication.

The NCD5500 works seamlessly with Base Station, making IP discovery and configuration fast and simple.
Default web-page login password: admin (user-changeable).

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Ethernet to Serial Communications Module

The Gen3 module converts TCP packets to serial data (and back again) for smooth, real-time control.

Features include:

• Auto Socket Control - Choose to close the socket after a programmable timeout or keep the connection open
• Connection Status LED - A blue LED indicates an active socket connection
• Flexible Baud Rates - Adjustable from 9600 to 115.2K, using the default TCP port 2101
• Network Options - Supports both Static IP and DHCP
• One-Button Recovery - Restore factory defaults instantly with a simple button press

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DHCP and Static IP Addresses

This module supports both DHCP and Static IP addressing.
For the most reliable remote access, we recommend using a Static IP Address once you are comfortable with the network configuration. This ensures consistent communication and predictable device access.

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TCP/IP Communications

The primary communication method is a standard TCP Socket. This creates a bi-directional connection, allowing your computer or control system to send commands and immediately receive responses through the same socket - fast, robust, and ideal for relay control applications.

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3rd Generation Hardware

The latest hardware represents a major leap forward in reliability, usability, and cost efficiency.

Key improvements include:

• Lower overall cost compared to previous generations
• Enhanced recovery options
• Web-based configuration UI
• Windows utility for discovering devices with unknown IP addresses
• Firmware upgrade support for feature updates and improvements

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Password Protection

Password protection is built in.
Under the management tab, users can assign a password for added security and access control.

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Port Forwarding

To access the module from outside your Local Area Network, Port Forwarding is required.
Your router forwards incoming requests on a specific port (e.g., 2101) to the device's local IP address.

Example:
A router is configured to forward port 2101 to 92.168.2.19:2101. Any external request to port 2101 is automatically routed to the module. Without this rule, the router would not know where to send the request, and the connection would fail.

Note: Port Forwarding is not needed for communication within your LAN.

For step-by-step instructions for virtually any router, visit https://portforward.com/ .

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Gen3 Web Page Control

Built-In Web Control for Gen3 Ethernet

With the 3rd-Generation Ethernet module, web control is now integrated directly into the device - no separate modules required. The Gen3 module stores and serves web pages that allow you to control relays right from your browser. Pre-built pages are included and can be uploaded using the free configuration software, or you can customize them using your favorite HTML editor.

Web pages automatically match the number of relays on your board and are currently supported on ProXR Lite controllers.

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Key Features

• Web-Based Relay Control - Access onboard web pages to control relays directly from your browser
• Ready-to-Use Pages
• Customizable Interface
• Optimized for ProXR Lite

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Connectivity Options

Once configured, the onboard web pages can be accessed from any device with a web browser - smartphones, tablets, and computers.
Because it's browser-based, it works across Android, iOS, Windows, and virtually any modern browser.

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Built-In Working Web Pages

The Gen3 module includes web pages tailored to the exact number of relays on your controller, as well as a dedicated page for reading analog inputs on ProXR Lite boards.

Features include:

• Relay control pages/
• Analog input monitoring
• Password protection
• Macro creation

Download relay-matched pages at: https://github.com/ncd-io/ncd_Ethernet.

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Custom Web Page Upload

The latest NCD5500 Control Panel (v1.0.0.7) supports uploading your own custom HTML page.
Because this is an embedded device, page size should remain small, but you now have full flexibility to:

• Modify sample HTML files
• Design your own interface
• Upload the page directly to the module

Sample pages and board-specific HTML files are available here: https://github.com/ncd-io/ncd_Ethernet.

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Read Analog Sensors

All ProXR Lite controllers include an 8-channel, 8/10-bit ADC.
The built-in ADC page displays live readings from the analog inputs (0 - 255 range), showing real-time values through on-page meters - accessible from your phone, tablet, or computer.

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Smart Phone Control

Once the Web-i page loads on your phone, simply bookmark it or add it to your home screen for app-like access.
As long as your device has an internet connection, you can monitor and control your relays from anywhere in the world, even over 3G or 4G networks!

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LAN or Internet Control

Control relays inside your local network or remotely from anywhere on the internet.
Once port forwarding is set up on your router, you can access Web-i pages just like any standard website. Use the built-in pages as-is or upload custom pages to match your application.

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Web-i Setup

A small amount of configuration is required to enable Web-i functionality.

• Using the configuration software:
• Select the Web-i option
• Upload the appropriate HTML page for your relay count
• Assign a Static IP Address for consistent access
• Access the web pages in your browser using the module?s IP address

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

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.

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

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.

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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

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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Supports Up To 16 Widgets

N-Button Lite offers the same widget types as the Pro version but is limited to 16 total widgets - perfect for smaller setups or budget-friendly applications.
Need more? You can upgrade to N-Button Pro at any time.

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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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Relay Control

Create Relay Buttons

Relay Button Widgets are the heart of N-Button. They let you turn relays ON or OFF instantly from your desktop - no programming, no scripting, and no setup headaches. Using an intuitive point-and-click interface, you can create exactly the type of control you need in seconds.

Create:

• A simple ON button
• A simple OFF button
A toggle button (one click ON, next click OFF)

These buttons float on your desktop, giving you immediate control without opening a full application or writing a single line of code.

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Create Buttons That Show Status

Relay Status Widgets automatically reflect the live state of each relay. As shown in the example, buttons can change color based on whether a relay is ON or OFF, so a quick glance at your screen tells you exactly what's happening in real time.

This visual feedback reduces guesswork and makes it easy to monitor multiple relays at once - especially in systems where knowing the current state is just as important as controlling it.

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Create Custom Buttons

Custom Buttons give advanced users access to the full power of the ProXR Command Set, one of the most advanced relay command systems in the industry. With N-Button Lite, you can send any supported ProXR command with a single button press - all without needing to write or compile code.

Each button can be fully customized to match your workflow. Change the button color, shape, and label, and configure colors to automatically update based on relay status. In the example shown, different colors clearly indicate ON and OFF states, making relay control both intuitive and visually unmistakable.

Whether you need simple control, live status feedback, or advanced command execution, N-Button buttons give you fast, flexible, and reliable control right from your desktop.

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Using A/D Inputs with N-Button

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.

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Control Relays Based on Analog Input Levels

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.

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Control More Than Just Relay Boards

Your widgets aren't limited to relay boards. You can configure buttons to:

• Send custom serial/IP data
• Open files, folders, or programs
• Launch applications
• Send HTTP requests
• Trigger data lists

Click a button, and N-Button sends the command where it needs to go.

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Power & More

Board Performance Ratings

This tab brings together the essential performance ratings you'll want to know for NCD SPDT Relay Controllers and their supported communication modules. You'll find practical electrical requirements, power consumption estimates, operating limits, relay timing details, and more-all based on typical 12VDC operation at 70°F (21°C). Think of it as a reliable snapshot of how our hardware behaves under real-world conditions. Because every installation is unique, some values are estimates and may evolve as designs and testing continue. Use this information as a planning tool to help you choose the right controller, build an accurate power budget, and understand the capabilities built into every NCD SPDT relay board.

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The SPDT Relay

SPDT (Single Pole Double Throw) relays include three terminals: 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 to NO.

Your load can be wired to either the NO or NC terminal depending on whether you want the device to turn on when the relay activates or when it releases. Examples of wiring methods can be found in the gray Relay Logic tab.

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2 Million+ Cycles

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

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SPDT Relay Board

SPDT Relay Controller Specifications

This table outlines key performance ratings for all NCD SPDT Relay Controllers, based on 12VDC operation at 70°F (21°C). Many values are estimated and may be updated over time. Some ratings reflect standard, out-of-the-box settings without performance optimizations applied.

Processing times can vary depending on background services and the commands you use. Standby power values assume no communication module is installed and no relays are active. For a more accurate power estimate, be sure to include the consumption of any installed communications module and any energized relays.

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	4ms	5ms	10ms	Needs Further Validation
Relay Deactivation Time	5mS	10mS	15mS	Needs Further Validation

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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.

Accessories

Relay Logic

Relay Wiring Samples

This page provides simple examples showing how to wire a single relay - or multiple relays - for common switching applications. We use a light as the example load, but you can substitute a gate controller, security panel input, dry contact device, motor trigger, or most other switched loads. These wiring samples demonstrate different ways to connect relays to achieve the switching behavior you need.

Get a printout of this page

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Relay Types

SPDT Relay

SPDT (Single Pole Double Throw) relays include three terminals: 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 to NO.

Your load can be wired to either the NO or NC terminal depending on whether you want the device to turn on when the relay activates or when it releases. Examples below demonstrate both wiring methods. The SPDT relays offered on this site are 5-Amp, 10-Amp and 20-Amp models.

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SPST Relay

SPST (Single Pole Single Throw) relays provide two terminals: Common (COM) and Normally Open (NO).

When the relay coil is energized, COM connects to NO to power the load. The only SPST relays offered on this site are our 30-Amp models. All SPST examples shown on this page apply to these relays as long as the example does not require a Normally Closed terminal.

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DPDT Relay

A DPDT (Double Pole Double Throw) relay contains two SPDT switches that operate together.

• Each side includes its own COM, NO, and NC terminals.
• Both internal switches change state at the same time.

This allows you to control two independent circuits with one relay. Wiring for each side of a DPDT relay follows the same rules as an SPDT relay, so the examples on this page apply directly. We offer the DPDT relays in 1-Amp, 3-Amp and 5-Amp models on ProXR boards starting at 8 relays.

Relay Grouping in the ProXR Command Set lets you combine individual relays to function like a DPDT relay using separate channels. This is ideal when you need to control multiple relays simultaneously or exceed the 5-Amp switching limit of our standard DPDT relays.

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Relay Logic Examples

Example 1 - Simple Off/On Control

This example shows the most basic way to use a relay to switch a device such as a light. When the relay energizes, its NO (Normally Open) contact closes to COM (Common), completing the circuit and turning the light on.

Only a single power wire is switched in this setup, making it the simplest method for controlling a light - or any device - using a relay.

Use this example for switching a light or any device you want to power only when the relay is on.

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Example 2 - Simple On/Off (Using NC Contact)

This wiring method keeps the device on by default. The relay switches a single power wire through the COM (Common) and NC (Normally Closed) terminals.
When the relay is not energized, the NC contact is closed to COM and the light remains on.
When the relay energizes, the NC contact opens, interrupting power and turning the light off.

This approach is ideal for devices that stay on most of the time, reducing relay wear since it doesn't need to remain energized to keep the device powered. It's also a useful method for power-cycling equipment - energizing the relay momentarily will turn the device off.

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Example 3 - AND Logic Using Two Relays

This example shows how two relays can work together so a light turns on only when both relays are energized. This creates an AND Logic condition:
Relay 1 AND Relay 2 must be on for the light to receive power.

A single power wire is switched, but it must pass through both relay contacts before reaching the light. This setup is ideal when two conditions must be met at the same time - such as requiring input from multiple sensors or system parameters.

MirC/MirX Users: This wiring requires two contact closure inputs on the sender board before the receiver's relay activates. Use this approach when two independent outputs must close before turning on the light.

For example, a light could turn on only when:
• A light sensor detects it's dark AND
• A motion sensor detects activity in the room

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Example 4 - AND Logic Using Three Relays

This example expands on the previous AND Logic concept. Here, the light will turn on only when all three relays are energized:

Relay 1 AND Relay 2 AND Relay 3 must be on for power to reach the light.

A single power wire is routed through all three relay contacts. Wiring from the NO (Normally Open) of Relay 1 to the COM (Common) of Relay 2, then from the NO of Relay 2 to the COM of Relay 3, creates a series path that requires every relay to close before the light can activate.

This method can be scaled easily - just continue wiring NO of each relay to the COM of the next relay. Add as many relays as needed to meet your logic or safety requirements.

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Example 5 - AND/OR Logic with Override

This example demonstrates a combined AND/OR logic setup. The light will turn on when:

• Relay 1 AND Relay 2 are both energized
  OR
Relay 3 is energized (override)

This wiring is useful when you need a normal logic condition plus a manual or automatic override option.

For example:
• Relay 1 = night/day sensor
• Relay 2 = motion sensor
• Relay 3 = manual override (local switch)

If it's dark and the motion sensor activates, Relays 1 and 2 energize to turn on the light. But if you want to control the light manually - regardless of sensor conditions - Relay 3 can override the logic and activate the light on its own.

A/D Board Users: The Relay Activator function on any A/D board or ProXR Lite board lets you connect a button or switch to any A/D input. This input can then control the override relay, giving you a convenient local button to manually override the first two relays.

MirC/MirX Users: Add a manual button or switch to trigger the third relay when you need direct control instead of sensor-driven control.

Reactor Users: A local button or switch can be wired to the third relay input to provide a manual override for sensor-based logic.

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Example 6 - OR Logic (Either Relay Activates)

This example demonstrates OR Logic - the light will turn on when either relay is energized. Only one power wire is switched, but it can pass through Relay 1 or Relay 2 to reach the light.

• If Relay 1 activates, the light turns on
• If Relay 2 activates, the light turns on
• If both activate, the light remains on

This setup is ideal when two independent sources should be able to control the same device. Common uses include:

• A timer controlling one relay, with a manual or secondary control for the other.
• Two sensors where either condition (motion detected or low light, for example) should activate the light.

A/D Board Users: The Relay Activator function on any A/D board or ProXR Lite board lets you connect a button or switch to any A/D input. This input can then be used as a manual control of the relay.

MirC/MirX Users: Wire two contact closure inputs into the sender board - either input can trigger the receiver relay to control the light.

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Example 7 - 3-Way Switch (Relay-Based 3-Way Control)

This example shows how to create a 3-way light switch setup using relays. A traditional 3-way circuit allows two switches to control the same light from different locations. In this wiring sample, each physical switch is replaced by a relay - but the operation is the same.

Only one power wire is switched, and the relays toggle the light depending on their current state.

• Activating either relay will toggle the light
• Activating both relays at the same time has the same effect as flipping both switches at once

This wiring method is especially useful because you can replace one of the relays with a physical light switch, giving you both computer control and manual control of the same light. When used correctly, this becomes one of the most flexible and powerful diagrams on the page.

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Example 8 - DC Motor Direction Control

This example demonstrates how to control the direction of a DC motor using two relays. By changing how the motor's leads connect to power, you can run the motor forward, reverse, or place it in a brake state. Braking is achieved by tying both motor terminals to the same power connection, which stops rotation through Faraday's Law.

Relay Operation Summary

• Relay 1 Off / Relay 2 Off → Motor Brake to +
• Relay 1 On / Relay 2 Off → Motor Forward
• Relay 1 Off / Relay 2 On → Motor Reverse
• Relay 1 On / Relay 2 On → Motor Brake to -

The capacitors shown are optional for small motors, but may be required in some situations:

• The induction suppression capacitor prevents the relay from shutting off due to motor back-EMF
• The 0.1µF filter capacitor reduces electrical noise, especially useful when powering sensitive electronics such as radios or amplifiers.

Capacitor Placement
• Place the induction suppression capacitor near the relays
• Place the filter capacitor near the motor
• Additional capacitors may be needed for certain motors

Important Note on Inductive Loads
Motors draw significantly more current at startup than during continuous operation - often 2-3 times their rated running current. For example, a motor rated at 5A (125VAC) may require 10-15A to begin turning. Always select a relay that exceeds the motor's initial inrush current, not just its running current. In this case, a 20-30A relay provides optimal performance and longevity.

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/li>
• 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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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.

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

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.

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Reactor Users

Reactor Events Settings

All Reactor configuration is handled inside Base Station.

You can define when a relay or event activates based on the voltage readings of analog inputs. Inputs can trigger relays directly or trigger timed events.

The Reactor GUI only appears when Base Station detects a Reactor board, and some functions may not display for other board types.

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TaraList Users

TaraList Setup

Base Station includes configuration tools and scheduling upload controls for TaraList Time Activated Boards.

TaraList users will see setup pages for creating and uploading time schedules. ProXR users won't - those pages appear only when Base Station detects a TaraList controller.

Data Sheets & Quick Start Guides

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