The RS-232 Interface

Connects to Third Party Devices

RS-232 remains one of the most universal and flexible control interfaces available. If your device can send serial commands, it can control these relays.

With DB-9 and direct-wire connectivity, RS-232 Relay Controllers can interface with:

• Industrial controllers
• Automation systems
• Legacy equipment
• Embedded systems
• Custom hardware
• Any device capable of sending serial (hex/decimal) commands

This makes RS-232 an ideal solution for device-to-device control, not just computer control. If your system has a serial output, this board can receive commands and trigger relays reliably and predictably.

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ZRS Serial Interface Module

This board is equipped with the ZRS RS-232 module, which adds a true hardware serial interface to the controller platform.

The ZRS module is available in three connection formats to match your wiring and installation needs:

• DB-9 connector
• Screw terminal (direct wire)
• Combined DB-9 + screw terminal

The ZRS module is powered from the serial port, while the relay board itself requires 12VDC power, available via hard-wire connection or optional power supply at checkout.

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Available RS-232 Connection Options

ZRS-A - Wire It Up     
Direct-wire screw terminal serial connection

ZRS-B - Plug It In     
Onboard DB-9 serial connector

ZRS-AB - Both     
DB-9 connector + direct-wire terminals

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Mounts as a COM Port

When connected to a computer, the RS-232 controller appears as a standard COM port.
Once powered, the board waits for incoming serial commands. Commands are sent as simple byte sequences, and the controller responds with a confirmation signal after execution.

This allows easy integration into:

• Custom software
• Automation scripts
• Industrial control applications
• Test systems
• Data collection platforms
• Legacy software environments
• Any system capable of serial communication can control the relays.

The ProXR Lite SPDT 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 Enhanced 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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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 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)

The ProXR Command Set

"The industry's most powerful relay command set"

Simple Serial Commands. Serious Control.

The ProXR family of controllers is driven by a powerful, low-level serial command set. You send a short numeric or Hex command to the board - and the board responds immediately.

This design keeps your software fast, reliable, and easy to integrate into almost any platform, from small scripts to full automation systems.

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How You Talk to the Board

All ProXR controllers operate using a small sequence of bytes sent over a serial connection.

You can send commands as:

• Decimal byte values
• Hex byte values

Both formats perform the exact same operations - choose whichever format your software or controller prefers.

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Relay Banks - How Large Systems Stay Simple

ProXR and ProXR Lite controllers organize relays into groups of eight called banks.

Each bank contains:

• Relay 1 through Relay 8

ProXR Lite boards are available with 1, 2, 4, or 8 relays and always operate within Bank 1 only.
Expandable ProXR boards use the same bank structure, but can add additional banks using XR expansion boards as your system grows.

For example:

• An 8-relay controller uses one bank
• A 32-relay controller uses four banks

Instead of creating a different command for every relay in a large system, the ProXR firmware lets you:

• Select a bank
• Send simple relay commands within that bank

This keeps the command structure fast, compact, and easy to manage - from a single-bank ProXR Lite installation to large, multi-bank ProXR expansion systems. From a single 8-relay board to a fully expanded 256-relay system, the command structure does not change.

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Two Ways to Address Relays

You can control relays in two different (and complementary) ways:

• Current Bank Commands - select a bank once, then issue fast relay commands
• Bank-Directed Commands - specify the bank directly inside the command

For small systems, selecting a bank once and sending fast commands is extremely efficient.
For larger installations, bank-directed commands make software logic easier and more robust.

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What You Can Do With the ProXR Command Set

The ProXR command set is designed to support real automation projects - not just basic relay switching.

Common operations include:

• Turn individual relays on or off
• Turn multiple relays on or off in a single command
• Read the on/off status of any relay
• Control relays by bank for large systems
• Read analog sensor values (A/D inputs)
• Assign and control internal timers
• Trigger relay pulses and timed operations
• Use onboard logic features such as the Relay Activator system

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What a Command Looks Like

At its simplest, a relay command is only three bytes:
254 8 1 - Turn ON relay 1 in bank 1
0xFE 0x08 0x01 - If you require Hex

The controller processes the command and returns a confirmation byte 85 when the operation completes.

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Designed for Any Programming Language

Because the ProXR command set is pure byte-based serial communication, you can use it from:

• Python, C#, C++, Java, Node, LabVIEW, and PLC environments
• Embedded controllers and microcontrollers
• Industrial automation and building control systems

If your software can open a serial port and send bytes, it can control a ProXR controller.

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No-Code and Learning Tools

If you do not want to write software immediately, free tools are available:

• Base Station Software - explore every command, watch live data, and test automation logic
• N-Button Software - create buttons and automation actions without writing code

These tools use the same command set your own software will use - making them ideal for learning and prototyping.

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Full Command Reference

This page is intended as a high-level overview of how the ProXR command system works. For the complete command reference, including all relay, bank, timer, and analog input commands, download the official guide:

ProXR Enhanced Quick Start Guide

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Relay Grouping - Switch Multiple Relays at the Exact Same Time

Control Neighboring Relays

Relay Grouping lets you control multiple neighboring relays as one logical output.

Think of it like building your own multi-pole relay:

• 2 relays → act like a DPDT
• 3 relays → act like a 3PDT
• ...
• up to 8 relays at once in the same bank

All of them switch together, using one command.

How it Works

Relay Grouping adds one extra value to a normal relay command called the Neighbor parameter.

The Neighbor value simply means: "Also apply this same command to the next 1-7 relays."
So instead of turning on just one relay...
you turn on that relay plus its neighbors in one shot.

Neighbors must stay inside the same relay bank

For example:

• Relay 1 can have up to 7 neighbors
• Relay 8 has no neighbors, because the next relay is in the next bank

This keeps grouping clean and predictable.

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Prevent Overlapping Relay States

Safe Break-Before-Relay Switching

Some applications require more than simply turning a relay on or off. When controlling motors, actuators, gates, shades, and door systems, it's critical that two opposing relays are never active at the same time.

The ProXR firmware includes a built-in Break-Before-Relay command that:

• Turns all relays off
• Waits a short, controlled delay
• Then turns only the selected relay on

This prevents overlapping relay states and eliminates the risk of driving a motor intwo directions at once.

Break-Before-Relay Command Example

This example performs a safe switch operation and then activates the selected relay.

Decimal:  254 46 0 0
Hex:  0xFE 0x2E 0x00 0x00
When the operation completes, the controller returns: 85 (0x55)

This safety behavior is handled entirely inside the ProXR firmware, so your software does not need to manage timing or relay interlocks.

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Relay Timers

Relay Timers - Built-In Time Control

ProXR controllers include 16 built-in relay timers that let you turn a relay on for a specific amount of time - without your software having to turn it back off.

This is perfect for applications such as:

• Door strikes and mag-locks ("buzz someone in")
• Key-card and access control systems
• Gate and barrier controllers
• Lighting and automation events

Once a timer command is sent, the controller handles the timing internally.

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Two Simple Timer Modes

ProXR relay timers support two easy-to-use modes:

• Duration - turns a relay ON for a specified time, then turns it OFF automatically
• Pulse - waits for the timer to expire, then briefly activates a relay

Most access-control and automation applications use Duration timers.

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Simple Duration Timer (Most Common Use)

A duration timer turns a relay ON, holds it ON for the programmed time, and then turns it OFF automatically.

You can program:

• Hours
• Minutes
• Seconds

Each ProXR controller provides 16 independent timers that can be assigned to any of the first 256 relays.

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Duration Timer Command Example

Send Bytes (Decimal):  254 50 50 0 0 5 0
Send Bytes (Hex):  0xFE 0x32 0x32 0x00 0x00 0x05 0x00
This example activates a relay for 5 seconds, then turns it off automatically.

When the command completes, the controller returns: 85 (0x55)

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Timing is handled inside the ProXR firmware, so your application only needs to send a single command to perform the entire operation.

Note: ProXR controllers do not include a real-time clock. Timers are intended for event-based timing (such as opening a door for a few seconds), not for scheduled calendar-based automation.

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Relay Flashers

Relay Flashers - Built-In Blinking and Pulse Control

ProXR controllers include a powerful background relay flasher engine. Once a relay is assigned to a flasher, the firmware automatically turns that relay on and off for you - no software timing loops required.

This is ideal for:

• Status indicators and stack lights
• Warning beacons and alarms
• Heartbeat and activity indicators
• Simple pulse or attention signals

Because flashers run inside the controller, your PC or PLC does not need to continuously send timing commands.

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Set the Flash Rate (All Flashers)

You can set the flash speed for all active relay flashers with a single command. The speed parameter ranges from 0-255, where:

• 0 = fastest flash rate
• 255 = slowest flash rate

This example sets the global flash rate:
Decimal:  254 45 0 128
Hex:  0xFE 0x2D 0x00 0x80
When the command is accepted, the controller returns: 85 (0x55)

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Flasher commands can also be combined with relay timers and other ProXR features inside Base Station, making it easy to build pulse, blink, and notification behavior without writing custom timing code.

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Base Station Software

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

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

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

"Reliable Power = Reliable Switching"

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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Powering from a Battery or Solar Panel?

NCD relay controllers are well-suited for battery-powered and solar-charged applications when operated within the recommended 10 - 15VDC range. This makes them ideal for remote, mobile, and off-grid installations using common 12V battery systems with solar charging. The power consumption data on this page helps you estimate runtime, size your battery, and avoid over-discharge. Staying within the voltage limits ensures stable, reliable operation in long-term battery and solar-powered setups.

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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

"Using a light as an example load, let's wire to the board"

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
• 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.

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