$sudo apt-get install minicom
$minicom -s
Choose "Serial port setup"
Change the value of "Serial Device" to "/dev/ttyS0" in order to use COM1.
Set "Bps/Par/Bits" to what you need.
"Hardware Flow Control"...whatever, up to the user.
Then choose "Save setup as dfl", or you have to configure minicom every time you use.
To use minicom, just type as below.
$minicom
After pressing enter key for twice, it will display the login of the hardware such as switch or others.
