1784-U2DHP | Allen Bradley USB to Data Highway Plus (DH+) Communication Adapter

Product Overview

The Allen Bradley 1784-U2DHP provides a high-performance bridge between modern computing hardware and legacy industrial networks. This USB-to-Data Highway Plus (DH+) adapter enables engineers to program, monitor, and troubleshoot PLC-5 and SLC 5/04 controllers directly from a laptop or workstation USB port. It replaces bulky PCMCIA cards and older serial converters, offering a streamlined, bus-powered solution for field service and factory floor diagnostics. We supply this unit as 100% brand new and original, ensuring full driver compatibility and signal integrity for your critical legacy infrastructure.

Technical Specifications

The 1784-U2DHP optimizes data throughput across varying DH+ network lengths:

Engineering Advantages

• Legacy Connectivity via Modern Hardware: The 1784-U2DHP eliminates the need for obsolete desktop computers with ISA/PCI slots or laptops with PCMCIA slots. It allows modern Windows-based engineering workstations to communicate natively with DH+ networks.

• Auto-Configuring Bus Power: The adapter draws its entire power requirement (5V DC) from the host USB port. This simplifies field use by removing the need for external power bricks or specialized batteries during mobile diagnostic sessions.

• High-Speed Network Performance: The device supports the full range of DH+ speeds. It achieves 230.4 Kbps for short-range high-speed transfers (up to 762 m) and maintains reliable 57.6 Kbps communication over long-distance cable runs up to 3048 meters.

• Real-Time Diagnostic Feedback: Dual LED indicators provide instant visual verification. The "USB Power" LED confirms the host connection, while the "DH+ Network" LED flashes to indicate active data packets, allowing technicians to verify network health at a glance.

• Plug-and-Play Integration: When used with RSLinx® Classic, the 1784-U2DHP installs as a standard communication driver. This enables seamless project uploads and downloads in RSLogix 5 and RSLogix 500 without complex protocol mapping.

FAQs

• Does the 1784-U2DHP support "Classic" PLC-5 processors?

  No. This adapter does not support Classic PLC-5 models such as the PLC-5/10, 5/12, 5/15, or 5/25. It works exclusively with the "Enhanced," "Ethernet," and "ControlNet" versions of the PLC-5 family, as well as the SLC 5/04.

• Is this a brand new, genuine Allen Bradley product?

  Absolutely. We guarantee that every 1784-U2DHP we ship is 100% brand new in original factory packaging. Each unit carries the verified UPC 612598520114 and satisfies E-E-A-T industrial procurement standards.

• Can I use this cable with a 64-bit Windows operating system?

  Yes, provided you use a compatible version of RSLinx Classic (version 2.57 or higher). The 1784-U2DHP supports 64-bit environments, making it suitable for modern industrial laptops.

• What precautions should I take regarding DH+ network termination?

  The 1784-U2DHP connects as a node on the DH+ network. Ensure your network has proper 82-ohm or 150-ohm termination resistors at both physical ends of the trunk line to prevent signal reflection and ensure stable communication with the adapter.