Epson ELPDC21, Руководство пользователя

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When the document camera is connected to a computer using a USB cable,
you can operate the document camera from the computer. Using the
software supplied, you can save images and video, adjust picture quality,
zoom, and so on.
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"Using the Computer Software" p.44
Connect the USB-B port on the document camera to a computer using a
USB cable.
Next, connect the computer to the projector. The cable used to create the
connection differs depending on the computer and projector you are using.
See the documentation provided with the computer and projector you are
using.
a
•
You cannot project images by directly connecting the document
camera to a projector with a USB cable.
•
Connect the document camera to a USB 2.0 port of a computer. If
you connect it to a USB 3.0 port, it may not function properly.
•
Do not connect multiple document cameras to one computer at the
same time.
Connecting to a Projector Using a Computer
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