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USBmicro's U451 USB Interface - US Only Shipping.

USBmicro's U451 USB Interface - US Only Shipping.

The U451 USB interface - US Shipping only

Please note that by adding this item to your cart shipping will be to United States only. If you want this shipped outside US, please go to:
USBmicro's U451 USB Interface -WW

For Conditions of Sale on the U4x1 products including Delivery details please read the Terms and Conditions.

The USBmicro U451 USB Relay Interface
The U451 is a USB solution that is pre-built, pre-programmed, and pre-tested and will get you interfacing your PC (Win/Linux) or Mac (OSX) to various devices in very little time! There is no USB device assembly, no driver development, and no firmware to write. Demo software applications can be used "right out of the box".

Features of the U451 USB Relay Interface

  •     Two Form-C relays, 125 volt, 10 amp
  •     Six 500mA switch-to-ground outputs on J4
  •     Firmware functions compatible with U401/U421
  •     U401/U421 Port 0 functions available on J1
  •     USB Interface to PC
  •     Uses HID Drivers Inherent in OS
  •     SPI Master and Slave Communication
  •     Stepper motor control
  •     1-Wire Communication Interface
  •     Flexible Pin Use
  •     Free Compiled Sample Applications
  •     Visual Basic, C, Delphi Example Code Available
  •     Fully Assembled and Tested
  •     Great Replacement for Parallel Port Interfacing
  •     PC's USB Power Brought to Device
  •     USB Cable Provided
  •     Available in Lead-Free for Europe

Overview of the U451 USB Interface
The U451 provides a simple digital i/o interface for the PC (Win/Linux) or Mac (OSX) . Two relays, six transistor outputs, and eight i/o lines from the microcontroller are provided. Commands can be sent to the U451 that change the eight i/o lines from input to output. I/o lines can be individually selected as inputs or outputs. The U451 supports commands to read the ports, and if the ports are set to output, to write to the ports.

The U451 has all of the firmware features of the U401 and U421.

The U451 is an assembled and tested circuit card that is 2.8125 inches (72mm) long and 1.625 inches (47mm) wide. The U451 has 5 mounting holes.

The U451 interfaces to the PC (Win/Linux) or Mac (OSX) via the USB port. An application on the PC (Win/Linux) or Mac (OSX) controls the U451. The U421 does not use any custom drivers, just the drivers that are a part of the operating system. Custom software can be developed to use the U451, or the applications that have been created as examples here can also be used.

Uses for the U451 USB Relay Interface
With the U451 you can utilize the USB port on your computer to interface to various electronic devices, such as: lights, LCD displays, SPI analog and memory devices, switches, relays, tethered robots, model railroad control, and many custom circuits.

See the ODN U4x1 Application Notes section for examples of using the U451.

Please note that by adding this item to your cart shipping will be to United States only. If you want this shipped outside US, please go to:
USBmicro's U451 USB Interface -WW


1) Do you need additional support on this product?
2) You can't find the information you need in the documentation?
3) You need additional examples, and data?
4) Any questions not covered in the above list?

Then please click on Support near the top of this page.

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USBmicro Support:


Home Page:http://usbmicro.com Rob Severson
Email:severson AT usbmicro.com
Shipped From  USBmicro North Dakota USA

USBmicro - Terms and Conditions of Sale

Important:   You will need to understand the information below before continuing with your USBMicro order.

This page contains information regarding:

  • Shipping costs
  • Insurance
  • Country shipping list
  • Courier and Express postal options
  • Expected delivery times
  • Tracking numbers and delivery status
  • GST for residents of Australia

Shipping Costs
All of the USBMicro products are shipped by Air Mail from the product Designer in the United States and shipping costs are included in the quoted prices.  If you are only purchasing a USBMicro product then please select the "Free Shipping" option when asked for Shipping Type on Checkout. Please also make sure you have selected the correct product for your region, as there is one for shipping to the US only and one for Worldwide Shipping (Outside the US).

If you are purchasing other goods at the same time, you may need to check if postage is included in the cost of the product, or whether postal charges will need to be added for the additional purchases.

Insurance is no longer available for any shipments. There are some countries that we are still unable to send to, please contact us to check if you are unsure.

These are some countries that we can send to:
Austria, Australia, Canada, Denmark, Finland, France, Germany, Greece, Ireland, Italy, Japan, Netherlands, New Zealand, Norway, Poland, Spain, Sweden, Switzerland, United Kingdom

These are some countries that we can't send to:
Afghanistan, Albania, Angola, Argentina, Ascension, Bahrain, Bolivia, Brazil, Cambodia, Cape Verde, Cayman Islands, Chile, Columbia, Congo, Costa Rica, Cuba, Dominica, Dominican Republic, Ecuador, El Salvador, Equatorial Guinea, Eritrea, Ethiopia, Falkland Islands, Guatemala, Haiti, Honduras, India, Indonesia, Iran, Israel, Jamaica, Jordan, Kiribati, North Korea, Laos, Libya, Maldives, Mexico, Mozambique, Nepal, Pakistan, Panama, Paraguay, Peru, Pitcairn Island, Romania, Russia, Rwanda, Saudi Arabia, Seychelles, Sierra Leone, Slovenia, Solomon Islands, all South American countries, Sri Lanka, Sudan, Tristan da Cunha, Turkey, Turks & Caicos Islands, Uganda, Uruguay, Vanuatu, Venezuela, Vietnam, Yemen.

Basically Africa, South America and the Middle Eastern countries are all in this category. If you are in these regions and are still interested in purchasing perhaps you can have it sent to another country and have someone else send it on for you.

Courier and Express Postal Options
EMS Courier and other Express Post or Courier options are not available for these products.

Wherever practicable, all orders sent from the United States are shipped on the next business day after the order is received, otherwise they are shipped on the following business day.

Expected Delivery Times
Unfortunately, delivery times for orders shipped from the United States can be quite varied and it is difficult to provide an accurate estimate of expected arrival times.  As a general guide, if you are in the United States delivery may take 2-3 days, Australia 6-10 days, Asia 10-14 days, United Kingdom 10-12 days, South Africa could be 3-5 weeks, and some South American countries could be 6 weeks. Some deliveries to Canada can take 2-3 weeks.

You will be advised by email as soon as your order is processed and has been forwarded to USBMicro in the United States for despatch.

Order Status and Tracking Numbers
International Orders: All USBMicro products are sent by standard Air Mail through the postal system, so once an order is posted there is no method of tracking the progress of package and there is no tracking number.

GST for Residents of Australia
As these products are manufactured and shipped from the United States, GST is not payable by Australian residents. When you register and log in as an Australian resident the shopping cart will calculate GST for other products if you order them with the USBmicro products. You don't need to place a separate order.

Australian Taxation Office Ruling:
Goods purchased from Dontronics and delivered via a non-Australian company makes the customer the importer, and as such the customer is making a taxable importation. The purchase may remain GST-free however, under the insubstantial value provisions. Goods of insubstantial value are goods on which customs duty and taxes come to $50 or less, and which have a customs value of:

  •    less than $1000 (for goods imported by post); or
  •    less than $250 (by other means)

From our own experience, 95% of low value imports (less than $1000 by post) do not attract any additional import fees into Australia.

  • Views: 2314
  • Brand: USBmicro
  • Product Code: U451-USB-$44-US
  • Availability: 369
  • AUD$59.55
  • ( USD$44.00 ) ( €uro 37.12 )
  • 5 or more AUD$56.57   ( USD$41.80 ) ( €uro 35.27 )
  • 10 or more AUD$53.59   ( USD$39.60 ) ( €uro 33.41 )
  • 100 or more AUD$50.62   ( USD$37.40 ) ( €uro 31.55 )