1. Checking the serial devices


        
            
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            In order to find which devices are available on a box, you can run:
    $ dmesg | grep tty
    serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
    00:0c: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
From this output, we can guess that there is 1 serial interface (/dev/ttyS0). You might possibly have more than one interface on your machine, this tutorial considers that you are using device 1 (ttyS0), if you use the second device, you will need to change ttyS0 by ttyS1.