Allen-Bradley 1784-U2DHP USB to DH+ Cable | Rockwell Automation By wayne No Comments on Allen-Bradley 1784-U2DHP USB to DH+ Cable | Rockwell Automation 3 Min Read The Allen-Bradley 1784-U2DHP connects a computer to a DH+ network via USB. It supports PLC-5 and SLC 5/04 processors with high-speed data transfer.