1784-U2DN | Allen-Bradley DeviceNet to USB Communication Interface Adapter

Product Overview

The Allen-Bradley 1784-U2DN functions as a high-performance communication bridge between a computer's USB port and a DeviceNet network. This specialized interface cable enables engineers to perform programming, configuration, and diagnostics on DeviceNet-linked devices using a standard PC. It replaces the need for internal PC cards by providing a portable, "plug-and-play" connection. We supply this unit as 100% Brand New and Original, ensuring your maintenance team possesses a factory-certified tool for reliable network commissioning.

Technical Specifications

The 1784-U2DN provides a transparent link between modern computing hardware and industrial fieldbus architectures.

• Manufacturer: Allen-Bradley / Rockwell Automation

• Product Type: USB to DeviceNet Communication Cable

• Part Number: 1784-U2DN

• Data Rates: 125 kbps, 250 kbps, and 500 kbps

• Cable Length: 0.61 meters (2.0 feet)

• Input Voltage: 5V DC (via USB port)

• DeviceNet Power Requirement: 24V DC at 75 mA (from DeviceNet network)

• Power Consumption: 0.5 Watts

• Enclosure Rating: IP20

• Compliance Standards: C-Tick, CE, KC, UL

• Weight: 0.31 lbs (0.14 kg)

Engineering Advantages

• Portable Diagnostic Flexibility: The compact, lightweight design allows technicians to carry the 1784-U2DN in a standard laptop bag. This portability solves the common industrial challenge of accessing remote DeviceNet nodes in large-scale facilities where fixed workstation access remains impossible.

• Bus-Powered Efficiency: The adapter draws its primary operating power (5V DC) directly from the host computer's USB port. This design simplifies field use by eliminating the need for external AC power bricks or specialized batteries.

• Auto-Baud Rate Detection: The hardware supports all standard DeviceNet transmission speeds (125/250/500 kbps). It synchronizes with the network speed automatically, reducing configuration errors during high-pressure troubleshooting sessions.

• Integrated Network Protection: The 1784-U2DN includes built-in isolation to protect the host PC from voltage spikes or ground loops present on the industrial network. This safeguard prevents expensive hardware damage to laptops during direct field connections.

• Universal Software Compatibility: This cable interfaces seamlessly with Rockwell Automation software suites, including RSLinx Classic. Once connected, the PC recognizes the device as a standard communication driver, allowing immediate access to RSNetWorx for DeviceNet.

FAQs

• Does the 1784-U2DN require an external power supply?

•  The USB side of the cable draws 5V DC from your computer. However, the DeviceNet transceiver side requires 24V DC (75 mA) from the actual DeviceNet network bus to function. Ensure your network power supply is active before attempting to browse the bus.

• Can I use this cable with Windows 10 or Windows 11? 

• Yes. Modern versions of RSLinx Classic (3.70 and higher) include the necessary drivers for the 1784-U2DN. Upon plugging in the USB connector, the Windows Device Manager should identify the hardware under "Universal Serial Bus controllers" or "Allen-Bradley Devices."

• Does the 0.61-meter length limit its use in large panels? 

• The cable length serves as a bridge to the nearest tap or port. For extended distances, you can connect the 1784-U2DN to a standard DeviceNet drop cable. Avoid using long USB extension cables, as these can degrade signal integrity and power delivery to the adapter.

• Is this a genuine Allen-Bradley product or a generic equivalent? 

• We guarantee this 1784-U2DN is 100% Brand New and Original. Every unit ships in factory-sealed packaging with the authentic UPC (612598524822), ensuring full compatibility with Rockwell Automation firmware and diagnostic tools.