This legacy remains in the name of serial interfaces on Unix systems: The teletypewriter sent out each key press as a character to a modem which then transmitted it further as serial bits via a telephone line. One of the first applications for serial data communication was the connection between teletypewriters and modems. Some examples illustrate how you can set up serial connections with your Pi and how to implement them in your Java applications by using the RXTX library. This post provides a short introduction in UART (Universal Asynchronous Receiver Transmitter), the basic form of serial interface. In an earlier post I introduced the Raspberry Pi as a great platform for tinkering. Application scenarios include firmware update, logging/debugging, data streaming and many more. A serial interface is also a common way to connect a PC to an embedded system. Today, serial interfaces can be found inside myriads of embedded systems where they transfer data between different components. Its origins date back to the 1960’s when serial communication was used between teletypewriters and modems. Serial communication is one of the ancient technologies in computing that is still relevant today.
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