The problem

Write and read from a serial port from Linux Bash.

The solution

1. Initialize serial port

   stty -F /dev/ttyUSB0 -speed 9600 cs8 -cstopb
   

2. Prepare to Read

   cat -v < /dev/ttyUSB0 &
   

3. Write (send a command)

   echo -en '\xAA\x04\xC2' > /dev/ttyUSB0