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USB Relay 1-Channel 10-Amp SPDT ProXR Lite

USB Relay Board 1-Channel 10A SPDT ProXR Lite Hardware Overview

USB Relay

USB Relay 1-Channel 10-Amp SPDT ProXR Lite

Product Code: R110PL_USB

R110PL_USB ProXR Lite Controller The R110PL_USB features the same ProXR Command set as our more expensive boards without the expandability of a full ProXR controller.

USB Relay

ProXR Lite Series at a Glance

  • Low-Cost High-Volume Surface Mount Machine-Manufactured Design
  • Based on 5-Year Warranty Designs with Limited Warranty to Lower cost
  • Offers 100% Emulation of ProXR Enhanced Command Set
  • 8-Channel of 8/10-Bit Analog to Digital Conversion
  • Supports 1, 2, 4, or 8 Relays on Bank 1
  • Not Expandable to Save Cost
  • Aggressive Quantity Discounts Available
  • Available with USB, 802.15.4, XSC, or ZigBee Mesh Interface


This Product:

R110PL_USB ProXR Lite Relay
USB Relay 1-Channel 10-Amp SPDT ProXR Lite
Stock#: R110PL_USB 

Related Products:

USB Relay 1-Channel 5-Amp SPDT ProXR Lite
Stock#: R15PL_USB $109

Power Supply Available

PWR12 Power Supply
The PWR12 is regulated power supply providing clean power necessary for the performance of these boards
Stock#: PWR12 $24/ea

Enclosure Available

CFL Enclosure
The CFL Enclosure is an undrilled, non-waterproof enclosure and is available at checkout for these controllers.
Stock#: ENC-CFL $14/ea

Desktop Control

N-Button Lite
Desktop Control & Monitoring
Control Relays without any programming!
N-Button creates up to 8 desktop widgets to control relays without any programming.

Order Today with This Board for Only $29
Stock#: N-Button Lite $49.00



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National Control Devices, LLC www.controlanything.com Since October, 1995 .

USB ProXR Lite Relay with A/D Conversion

USB Virtual COM Relay Controller with 8-Channels of
Analog to Digital Conversion and the ProXR Command Set

About USB:

Our New USB ProXR Lite Series Relay Controllers make it easier than ever to add computer controlled switching to your most demanding computer control applications.  Simply connect to your computer and this controller mounts as a Virtual COM Port on your PC, allowing easy programming from any language that supports serial communications.

This ProXR Lite series controller connects to the USB port of your computer and requires a 12VDC Power Supply.  Once powered up, the relay controller waits for a command.  A command consists of a few bytes of data.  Usually between 2 and 6 bytes.  Once the command has been received, the controller processes the command, and sends you back ASCII character code 85 to signal the completion of your command.

Read More About USB Communications

Induction Capacitors

Induction CapacitorPerhaps the most overlooked aspect of relay control is proper handling of inductive loads. Inductive loads can best be defined as anything with a magnetic coil, such as a motor, solenoid, or a transformer.  Controlling a inductive load using this relay controller requires the use of induction suppression capacitors.  The purpose of this capacitor is to absorb the high voltages generated by inductive loads, blocking them from the contacts of the relay.  Without this capacitor, the lifespan of the relay will be greatly reduced.  Induction can be so severe that it electrically interferes with the microprocessor logic of our controllers, causing relay banks to shut themselves down unexpectedly.  In the case of USB devices, customers may experience loss of communications until the device is reconnected to the USB port.  Capacitors that we offer are available at checkout, for more information view our Induction Suppression Video.

Easy Software Development

Most of our customers write their own program for controlling these devices and use almost any language to do this.  This boards supports the Serial Port Profile, meaning they will mount to the computer as a virtual com port making it very easy to send commands to the device.  This board will support almost any programming language you are comfortable with.

Plug-In for Visual Studio

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 samples included with this free download!  Component Library.

Base Station Software

Base StationBase Station will assist you in learning how this device functions and is the ultimate reference tool for setting up, testing and controlling this device.  Base Station software supports every feature of this device - no other controller manufacturer even comes close to offering this type of software.  Base Station works by communicating with your controller to identify the model and provides the appropriate graphical user interface for setting up and testing the identified device.  To help you get started and learn this controller Quick Start Guides are available for just about every feature.  As you discover a feature in Base Station a link is provided where you can easily download the Quick Start Guide.

ProXR Lite Relay

We've looked at the interface and the programming now let's take a look at the board design itself.  The ProXR Lite series controllers are machine manufactured for a highly accurate and reliable design.  Fully tested before they leave the production facility each ProXR Lite controller is ready to stand up to rigorous demands from heat, cold or vibration.  The best test of all is the numerous boards in the field from customers all over the world in all sorts of conditions.  Take it from us, these controllers will hold up!

Break-A-Way Tabs for a Smaller Design

The ProXR Lite relays have a great feature where space is a premium - Break-A-Way Tabs. The Break-A-Way Tabs allow most boards to fit in an optional undrilled plastic enclosure.  Snap off the Break-A-Way Tabs and you have a controller with a smaller profile when you need to fit in a tight space.

Not Expandable

Unlike it's big brother, the ProXR Series, the ProXR Lite series controllers are NOT expandable. The firmware still thinks 256 relays are available but the relay portion of the controller only responds to the first 1, 2, 4 or 8 relays in Bank 1.

Read Analog Sensors

We did NOT skip the Analog Input portion of the ProXR Lite.  All ProXR Lite controllers offer a 8-Channel 8/10-Bit Analog to Digital Converter in addition to relay control.  Read and control from 8 sensors per board from 0 to 5 volts.  Look for more on this below.

Full ProXR Enhanced Firmware Installed

This board has ProXR Firmware installed that responds to the full ProXR Command Set - it's just not expandable.  The ProXR Firmware is the industry leading firmware for controlling relays with more commands and functionality than any other board on the market.  The list of commands and parameters this board is capable of is extensive.  ProXR Enhanced is the newly released enhance version of the ProXR Firmware with more commands, more functionality and better control than ever before!  For a detailed list of all the commands with descriptions see our ProXR Enhanced Command Set.

Compliance to ROHS StandardsRoHS Compliant

This board is led free and RoHS Compliant.  If your requirements are for RoHS compliant parts this board is manufactured with RoHS compliant led free parts and solder.

30-Day Warranty/Money Back Guarantee

ProXR Lite series controllers are guaranteed against manufacturing and functionality defects for a full 30 days!  Not to mention a 30-day money back guarantee!  If for any reason you are not happy with a relay purchased from National Control Devices, simply return it within 30 days and we will give you your money back!  Controllers that are damaged by our customers will not of course be warranted under any circumstances. 

Thousands or Relay Cycles

ProXR Lite series controllers are designed for long life, you should expect to get years of service from your controller and literally thousands of cycles from the relay(s) onboard.  With a 30-day warranty and a money back guarantee you have nothing to loose!  Place your order now, while everything is in front of you.


The boards sold are brand new units shipped from our office conveniently located in Missouri.  These boards are completely tested before they are released for shipping  With so many boards on our site it is impossible to stock boards, please allow two to three days production time for your order to ship.

ProXR Lite Is Here!

A more streamlined manufacturing process brings a more durable, reliable and better relay board to the market.  Here's a lists of great features:
    User Friendly Board Design
  • Surface mount allows for a smaller more reliable board
  • Break-A-Way Tabs lets you decide the board's size
  • Screw terminal or direct relay connections make connecting to the board easy
    ProXR Lite Features
  • Works with the full ProXR Enhanced Command Set
  • 8-Channel 8/10-Bit Analog to Digital Converter
  • Highly reliable relay with industry leading command set
    ProXR Lite Limitations
  • This controller cannot be expanded

Analog to Digital Conversion

Analog Inputs are very special in that they are sensitive to voltage changes.  Analog to Digital (A/D) conversion is the process of converting a voltage in the range of 0 to 5VDC into a number that can be processed by custom software that you develop.  The ProXR Command Set will allow you to send a command to the board and read voltage levels from 0-5 volts using 8-bit resolution.  8-Bit resolution will read the voltage input (from 0 to 5VDC) and then is interpreted as a value from 0 to 255.  Zero being a contact closure input.
    For Example
  • A voltage input of 0 Volts is interpreted as a value of 0
  • A voltage input of 2.5 Volts is interpreted as a value of 127
  • A voltage input of 5 Volts is interpreted as a value of 255
So if you divide 5 Volts by 255 possible steps (0-255 for 8-Bit resolution), the board is sensitive to voltage changes as small as 0.019 Volts.  This controller has eight A/D inputs, each input is capable of reading a separate voltage from 0 to 5 VDC, provided all voltages can share a common ground.  This is particularly useful for reading temperature sensors (one temperature sensor is built into select boards mostly 4 & 8 channel, shared with analog input number 8).  A/D Inputs are also useful for reading light level sensors, thermocouples, switch closures, or just about any other kind of sensor you can think of.

A/D Sample Programs Available

Eight Different A/D Sample programs are available in the Component Library.  These samples are available as a free download and are compatible with Visual Studio. 

N-Button Lite

N-Button Lite creates up to 8 buttons or widgets to control relays without any programming. A new button will be created and placed on the desktop of your computer for each relay that you want to control. N-Button Lite supports Serial Port/ USB and Network connection between PC and relay board. N-Button Lite Manager makes it easy to add any type of button to the desktop and change the properties.

Analog to Digital meters can also be added to your desktop to instantly read the status of any sensor or probe you may have connected to the board. Each meter is customizable and can be changed without any programming knowledge.

Relay Button widgets turn on/off relay directly. It has never been so easy to control relays before.
Relay Status widgets show status of the relay automatically.
A/D Meter widgets display the value of A/D channel automatically.
Customized Button widgets allows you send any of the commuands in the manual to relay board.

N-Button Lite is available as a free download. Look for the Desktop Control section to the right to download.

N-Button Lite version supports up to 8 widgets. If you want to add more than 8 widgets, simply upgrade to the N-Button Standard version.

Read More About Analog to Digital Conversion



NCD Base Station Software .zip file  Base Station identifies the controller that is attached to your computer and provides a convenient graphical user interface for controlling and testing your NCD Device. USB Quick Start Guide USB Quick Start Guide Understanding the USB Interface and configuration ProXR Quick Start Guide ProXR Quick Start Guide Understanding configuration options and sending commands A/D Quick Start Guide A/D Quick Start Guide Understanding Analog to Digital Conversion Download USB Drivers Download Drivers Latest USB Virtual COM Port Drivers NCD Component Library The NCD Component Library is a Plug-In for Visual Studio 2005/2008 that greatly reduces software development time, effectively reducing most control operations to a single line of code.  This free download includes many example applications covering a wide range of topics. Wiring Diagrams Wiring diagrams that will help you understand how to connect to your devices and use relays as a form of control logic

USB Relay 1-Channel 10-Amp SPDT ProXR Lite

Product Code: R110PL_USB
USB Relay 1-Channel 10-Amp SPDT ProXR Lite

Quantity in Basket: None
Code: R110PL_USB
Price: $120.00
Shipping Weight: 1 pounds
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