Please explain how to use 634 model with usb interface.

[goooly]

I don't understand how to install and use original software and plugins, because there is no such options like use usb port, only COM ports. Please explain me what to do. Thanks!

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[CF Tech]

Take a look at all three parts of this guide:

http://www.crystalfontz.com/software/usb/step1.php

That will make the display appear as an additional COM poty, then off you go with whatever serial software feels good.