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What is Serial port?
http://www.softwaretipsandtricks.com/guides/articles/387/1/What-is-Serial-port/Page1.html
By Super Admin
Published on 06/30/2011
 
What is Serial port?

What is Serial port?
DB 9 or Serial port is a 9-pin port that transfers data serially. It is increasingly being left out from the back panel in favour of faster ports like USB. It is used today mostly for external modems.