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Read key data
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Read the serial port of the source code
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Serial port is a common computer interface, with less cable and communications simple and widely used. Common serial is RS-232-C interface (also known as EIA RS-232-C) it was 1970 years by United States electronic industry association (EIA) combined with Bell System, computer terminal and modem manufacturers manufacturers jointly developed standard for serial communication. Its full name is "data terminal equipment (DTE) and data communications equipment (DCE) interface technology of serial binary data interchange between standard" which provides the use of a 25 foot DB25 connector, each connector pin signal content is prescribed also provides various signal level. Symbol distortion, transmission distance is less than the 4% case, the transmission cable length is 50 feet.
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