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Serial and UART Tutorial
<email>uhclem@FreeBSD.org</email>
<personname><firstname>Frank</firstname><surname>Durda</surname></personname><affiliation> <_:address-1/> </affiliation>
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Microsoft, IntelliMouse, MS-DOS, Outlook, Windows, Windows Media and Windows NT are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries.
Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this document, and the FreeBSD Project was aware of the trademark claim, the designations have been followed by the <quote>™</quote> or the <quote>®</quote> symbol.
$FreeBSD: head/en_US.ISO8859-1/articles/serial-uart/article.xml 44692 2014-04-29 02:46:48Z wblock $
This article talks about using serial hardware with FreeBSD.
The UART: What it is and how it works
<emphasis>Copyright © 1996 Frank Durda IV <email>uhclem@FreeBSD.org</email>, All Rights Reserved. 13 January 1996.</emphasis>
The Universal Asynchronous Receiver/Transmitter (UART) controller is the key component of the serial communications subsystem of a computer. The UART takes bytes of data and transmits the individual bits in a sequential fashion. At the destination, a second UART re-assembles the bits into complete bytes.
Serial transmission is commonly used with modems and for non-networked communication between computers, terminals and other devices.
There are two primary forms of serial transmission: Synchronous and Asynchronous. Depending on the modes that are supported by the hardware, the name of the communication sub-system will usually include a <literal>A</literal> if it supports Asynchronous communications, and a <literal>S</literal> if it supports Synchronous communications. Both forms are described below.
Some common acronyms are:
UART Universal Asynchronous Receiver/Transmitter
USART Universal Synchronous-Asynchronous Receiver/Transmitter

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articles/serial-uart.pot, string 2