Serial interfaces can be used to provide standardized logic levels from transmitters to receivers, define the transmission medium and connectors, and specify timing and data rates. But with high-speed data so common today, a serial interface is the only practical option for communications over any distance greater than several feet. Parallel buses are still used in some applications. ![]() The whole purpose of a serial interface is to provide a single path for data transmission wirelessly or over a cable. Both are still alive and well in many applications. These legacy interfaces aren’t obsolete or discontinued, though. Two of the oldest interfaces are RS-232 and RS-485. Then there’s Ethernet and USB and other higher-speed serial interfaces like FireWire, HDMI, and Thunderbolt. A few have become universal, such as I 2C, CAN, LIN, SPI, Flex, MOST, and I 2S. Most have been developed for specific applications. This article is part of the Communication Series: What’s the Difference: Serial Communications 101ĭozens of serial data interfaces are used today.
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