USB Relay
USB Relay Controller  USB Relay Board

USB Computer Controlled Switching
USB Relay Controllers allow computer controlled switching using the USB port of your computer.  An NCD USB Relay Board emulates a COM port, allowing you to speak to the relay board using any programming language that supports serial communications.  COM drivers allow you to assign any COM port to the USB Relay Board.  An NCD USB Relay Driver supports 8-Channels of 8-Bit / 10-Bit Analog to Digital Conversion (A/D) or UXP Expansion Port, and includes an XR Relay Expansion Port for adding additional relays to the USB Relay Controller Board.
    Quick Summery of USB Communications
  • USB Interface mounts as a Virtual COM Port on your PC for easy programming and 100% compatibility across ALL operating systems
  • Plug in, open the Virtual COM Port at 115.2K baud, and start sending commands
  • Expandable to control up to 256 Relays using the XR Expansion Port
  • SPDT, SPST, DPDT and Reed Relay versions available
  • Control one relay at a time or all relays at once with manual and automatic refreshing command set
  • ProXR versions are capable of controlling up to 256 relays
  • All USB Controllers are SignalSwitch Compatible
Lead Product Developer Ryan Sheldon Descries USB Relay Control Technologies, Covering the ProXR Standard and ZigBee Wireless Relay.
4 Channel USB Relay Board

USB Relay
Our USB Relays feature a wide range of controllers to fit just about any application!   DPDT and SPDT controllers are available with your choice of eight channel 8/10-Bit Analog to Digital Conversion or UXP Expansion Port on selected models and all are of course SignalSwitch compatible.  All USB models feature the ProXR Command Set and an XR Expansion Port.  Built from the ground up with Expansion in mind, simply Chain the XR Expansion Modules, one after another, to meet your computer controlled switching requirements. For more detailed information and to order, please click on the links below.

Click the above link for an exclusive article on USB communications
A/D Conversion
USB Analog to Digital Converter
UXP Expansion
UXP Expansion Port
XR Expansion
ProXR versions
USB Relay with Analog to Digital Conversion available on the 2 through 32 channel models USB Relay with UPX Expansion Port available on the 16, 24 & 32 channel models USB Relay with XR Expansion Port available on the 2 through 32 channel models

Onboard analog to digital conversion is available on selected models of these controllers! This will allow you to:

  • Read light and temperature levels
  • Easily activate relays when A/D limits are reached
  • Detect audio levels in a room when connected to a microphone
  • Read switches, potentiometers, and analog joysticks
  • applications are limitless, and surprisingly easy to integrate
  • Available on 2 - 32 channel model USB boards

UXP is a new standardized data port, specifically for the purpose of speaking to various expansion modules. If the controller you are considering is equipped with a UXP port, you can take advantage of extended commands to speak to our growing line of I/O expansion modules. UXP in the part number allows you to:

  • Add Contact Closure Inputs
  • Add Analog to Digital Inputs
  • Add Voltage Detectors
  • Digital Potentiometer Outputs
  • Available on 16, 24 & 32 channel model USB Boards

Models with the ProXR suffix will feature the ProXR commend set. The ProXR series will allow you to:

  • Send simple commands to activate relays
  • Upgrade without having to re-write your software
  • Activate up to 16 relay timers
  • Control up to 256 total relays using the XR expansion port
  • Full backward/forward compatibility w/the ProXR series command set
  • Available on the 2 - 32 channel model USB boards

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