Order now the Allen-Bradley 1784-U2DHP — the enhanced USB to Data Highway Plus (DH+) communication interface cable, delivering reliable and isolated PC-to-DH+ connectivity for programming and diagnostics of Allen-Bradley legacy automation systems.
What Is the Allen-Bradley 1784-U2DHP?
The 1784-U2DHP is an enhanced-version USB-to-DH+ communication cable from Allen-Bradley (Rockwell Automation). It serves as a direct upgrade to the 1784-U2CN, offering improved compatibility with modern operating systems and additional diagnostic LEDs that provide real-time network activity feedback. The cable connects a standard PC USB port to Allen-Bradley DH+ networks, enabling full programming, monitoring, and configuration of PLC-5, SLC 500, and compatible MicroLogix systems without the need for a dedicated communication card.
Key Technical Specifications
- Interface: USB (Type A) to DH+ network
- Compatible networks: Data Highway Plus (DH+)
- Compatible software: RSLogix 5, RSLogix 500, RSLinx Classic
- Operating systems: Windows 7, Windows 10, Windows 11 (with driver)
- Cable length: Approximately 1.8 m (6 ft)
- Connector type (network side): 6-pin mini-DIN
- Diagnostic LEDs: TX and RX activity indicators
- Isolation: Optical isolation for full network and PC protection
- Power supply: Bus-powered via USB
Differences Between 1784-U2DHP and 1784-U2CN
While both cables serve the same fundamental purpose — USB-to-DH+ connectivity — the 1784-U2DHP includes enhanced features over the 1784-U2CN:
- TX/RX diagnostic LEDs for real-time communication monitoring
- Improved driver support for Windows 10 and Windows 11
- More robust USB chipset for increased stability in demanding environments
For new installations or replacements, the 1784-U2DHP is the recommended choice over the 1784-U2CN.
Expert Tips
- Use the TX/RX LEDs to quickly verify whether the cable is actively communicating with the DH+ network before starting a programming session — this saves significant troubleshooting time.
- If you are replacing a 1784-KTX or 1784-KTXD card with this cable, reconfigure your RSLinx driver from 1784-KTX/KTXD to USB Devices to avoid communication conflicts.
- Always use the cable on a dedicated USB port directly on the PC motherboard. USB 3.0 ports may occasionally cause driver conflicts — if issues arise, switch to a USB 2.0 port.
Frequently Asked Questions
Q: Can the 1784-U2DHP replace the 1784-U2CN directly?
A: Yes. The 1784-U2DHP is a functional upgrade and direct replacement for the 1784-U2CN in all DH+ communication applications. The same RSLinx Classic driver configuration applies.
Q: Does the 1784-U2DHP work with RSLinx Classic Gateway?
A: Yes, it is fully compatible with RSLinx Classic Gateway, allowing DH+ network access to be shared across multiple clients on the same local network.
Q: What does it mean when the TX LED is solid and RX is not blinking?
A: A solid TX LED with no RX activity typically indicates the cable is transmitting but not receiving responses — check the DH+ node address in RSLinx and verify the network termination resistors are correctly installed.
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