If you have traditional D subminiature (DB9) Serial Ports,just identify the relevant pins (RXD, TXD,RTS,DTR and Ground) and continue with the tutorial. You can use any FT232 based board ( other USB converter boards based on different chip sets should work,but i have not tested it ) or you can buy the one I am using here. Please note that in this tutorial I am using a USB to Serial Converter based on FT232 from FTDI. One problem with the traditional serial ports is that they are now legacy hardware and are being phased out by the PC manufacturers and most laptops have USB ports only,this problem can be easily solved by using a variety of USB to Serial Converters available in the market,eg USB2SERIAL V2.0. This is a tutorial on how to program the Serial Ports on your Linux box.Serial Ports are nice little interfaces on the PC which helps you to interface your embedded system projects using a minimum number of wires.In this tutorial we will write a small program that will send and receive ASCII characters to a microcontroller development board.
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