RS-232, RS-422 and RS-485 serial data interface standards are the first by the Electronics Industry Association (EIA) and published in, RS-232 issued in 1962, named for the EIA-232-E, as the industry standard to ensure that different manufacturers of compatible products. RS-422 by the development of RS-232, which is designed to remedy the lack of RS-232 made. RS-232 to improve the short-distance communications, the shortcomings of low-rate, RS-422 defines a balance between communication interface transfer rate up to 10Mb/s, transmission distance was extended to 4000 feet (at rates of less than 100kb/s), the and allow the balance on a bus to connect up to 10 receivers

串口通讯RS232详解.pdf

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