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ANSI applications ASCII ASCII character asynchronous serial baud binary buffer byte called char character set circuit Clear to Send conductor configuration connected connector console terminal control character data bits data communications data lines Data Set Ready Data Terminal Ready data transfers destination device discussed equipment error rate event experiment Figure frequency full-duplex function hardware hexadecimal I/O port implement input interrupt service routine interrupt-driven I/O jumper keyboard line monitor Line Signal Detector loop loop-back microcomputer microcomputer systems mode modem null-modem operation output parity bit phase polling printer protocol PUTC real-time display Received Data Received Line Signal remote Request to Send ribbon cable RS-232-C interface RS-232-C standard sequence serial I/O port Signal Ground solder stop bits switch synchronous tion Transmitted Data UART USART voltage