| Quick Start Guide | Quick Start Guide |
| NCD Base Station Software |
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| Download USB Drivers | Download Latest USB Virtual COM Port Drivers |
| Download Manual | Download ProXR Manual |
| 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: several simple ways to wire a relay for various applications. |
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Watch as we show you how to Set Up the Hardware and Software necessary to use your USB Relay Controller

Learn how computer controlled relays communicate and control

Learn the basics of wired communications and find the right wired controller for your application

Learn about Induction Suppression and how to counter it using Capacitors

Learn about Analog to Digital Conversion and its uses

Learn how to find the Com Port that your Device is using

Learn about the Expansion Options available to use with our controllers
| Discontinued - This item has been replaced by a new Item, see product description for details | |
| Stock#: UXPRR16-5SPDTPROXR | |
| 1-9 | $389.00 |
USB Virtual COM Relay Controller with
UXP Expansion Port and
XR Expansion Port
Our New USB ProXR 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 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
With all the control and backward/forward compatibility you have come to expect from the ProXR series command set, this controller allow you to send simple commands to activate relays, read the status of relays, activate up to 16 relay timers, and control up to 256 total relays using the XR Expansion Port. All relays are electronically latched, simply send a command to turn the relay on, send a different command to turn the relay off.
You can send commands to activate relays, deactivate relays, control all the relays at one time, plus you can send commands that tell a relay to turn on for a few seconds, minutes, or hours. You can assign 16 timers to any of the 256 relays, and set the timers to go off after the duration has expired. That's just the beginning, find out more about our ProXR Command Set.
Read More About the ProXR Standard
If you need to add capabilities beyond basic relay control to your application, then you may want to consider using one of our controllers equipped with a UXP Expansion Port. UXP is a standardized data port, specifically for the purpose of speaking to various expansion modules. This Relay Controller is equipped with a UXP port, allowing you to take advantage of extended commands to speak to our growing line of I/O expansion modules.
ALL RELAYS ARE HERMETICALLY SEALED, Relay Controller Requires +12VDC Power Supply, Photos May Show Options or Accessories Not Included with Relay Controller. USB Specification Prohibits Relay Controllers from Being USB Bus Powered due to Surge Currents. NCD will NOT Design/Manufacture a Mechanical Relay Controller that is USB Bus Powered, Please Be Cautious of Any Manufacturer who Offers such a Device.
Discontinued - This item has been replaced by a new Item, see product description for details | |
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Code: UXPRR16-5SPSTPROXR Price: $309.00 Shipping Weight: 1.00 pounds | |
| Discontinued - This item has been replaced by a new Item, see product description for details | |
Computer Control
Mobile Device Compatible
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National Control Devices, LLCWorld's Largest Manufacturer of Computer Controlled Switching Devices Since 1995. |
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Please Note: Our office and production facility will be closed for Memorial Day on May 27th.
Orders will be processed in the order they are received.