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Serial communication
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==Serial buses== [[File:DB25 Diagram.svg|class=skin-invert-image|thumb|[[RS-232]] connector ([[D-Sub]] DB-25 variant)]] Many communication systems were generally designed to connect two integrated circuits on the same [[printed circuit board]], connected by [[signal trace]]s on that board (rather than external cables). [[Integrated circuit]]s are more expensive when they have more pins. To reduce the number of pins in a package, many ICs use a serial bus to transfer data when speed is not important. Some examples of such low-cost lower-speed serial buses include [[RS-232]], [[Digital Addressable Lighting Interface|DALI]], [[Serial Peripheral Interface Bus|SPI]], [[CAN bus]], [[IΒ²C]], [[UNI/O]], and [[1-Wire]]. Higher-speed serial buses include [[USB]], [[SATA]] and [[PCI Express]].
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