Overview of USB Direct Connect.
HP Designjet Printer - USB Direct Connect Overview
Information
Details
Features:
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Plug & Play
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RAW data protocol
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DOT4 (IEEE 1284, MLC) NOT supported
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Supported in Windows, UNIX/LINUX and Mac
USB 2.0 vs USB 1.1:
Transfer Speed
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USB 1.1 up to 12 Mbps
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USB 2.0 up to 480 Mbps
Fully backwards compatible. Same cabling and connectors.
Problems with USB:
Cable problems:
Maximum length: 5 m
Longer distances can be covered with USB hubs.
Power related issues:
Possible causes:
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Non powered USB hubs
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USB ports on keyboards
Anyways, designjets do not use USB power to drive communication, and hence these are not likely problems.
Chipset issues:
The motherboard chipset is a set of components that controls various HW functions. Most USB problems are caused by chipset issues.
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