Read and Write to ttyS0 serial ports in Linux

Two ways to interface to the ttyS0 serial port:

1)  via terminal command line:

echo "ABCDEF" > /dev/ttyS0
cat /dev/ttyS0


To configure the port:
stty -F /dev/ttyS0 speed 9600 cs8
stty -F /dev/ttyS0 speed 9600 cs8 -cstopb -parenb




2) via C Program: minicom
sudo apt-get install minicom
when done use
sudo minicom -s


3) By writing your own app in C++ or C# or any other preferred Programming language:
I will have some sample working programs here soon.