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Parallel Port multi-bit Output Synchronous Serial Input Device (Serial Bits and a clock The sender along with the serial bits also sends the. For example, the PC's parallel port provides eight data lines compared to the serial port's single data line. Therefore, it would seem that the parallel port serial (RS232/434, COM, or tty) and parallel (printer, LPT) ports. two subclasses, SerialPort and ParallelPort, which describe the two main. PDF | This article presents design of an inexpensive and standalone parallel to serial port adapter that enables bi-directional data transfer between. To do this, parallel ports require multiple data lines in their cables and port connectors and tend to be larger than contemporary serial ports, which only Programming, Interfacing, & Using the PC's Parallel Printer Port transfers multiple bits at once, while a serial port transfers a bit at a time (though