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They're two different kinds of ports. USB is much faster and is far newer technology. Serial ports are slow and have been around for a very long time. A device either plugs into a Serial port or a USB port. It can't plug into both.

- What kind of device are you trying to connect?
- What does the connector on the end of the cord look like? Is it large with two rows of pins or is it small and flat?
- Did it come with an adapter so you can connect it to either port?
- What operating system is your computer running?
 
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