Need to disable USB and Parellel ports on Designjets 510 & 800

Hi,
Ive looked through the menus and through the web browser but I cant find any way to disable these ports. Students are charged to use the printer and I dont want them to be able to plug in their laptops directly.
Many thanks.

This forum is focused on consumer level products.  For the Designjet you may have better results posting in the HP Enterprise Designjet forum here.
Bob Headrick,  HP Expert
I am not an employee of HP, I am a volunteer posting here on my own time.
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