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RS232 is a specification for serial communications between a DCE and DTE (eg, computer and modem); it defines electrical characteristics, the 25-way 'D' connector and the various functions of the various signal lines. A UART is a Univeral Asynchronous Receiver and Transmitter - it is an electronic circuit which handles communication over an asynchronous serial interface - very often an RS232 interface. A USART is a Univeral Synchronous/Asynchronous Receiver and Transmitter - it's like a UART, but also supports Synchronous links