In my line of work I use serial port on some devices frequently and most new computers do not have serialport. In Linux I found out that it’s easy to connect using usb to serial and screen, but now when I’ve got mac it looks like there is no driver for the usb to serial by default.
I bought PL-2303 Driver (€6.17/$7.36) and all my problems are solved. It'a easy and fast installation.
After I connect the USB serial converter I simply type in:
screen /dev/tty.Repleo-PL2303-00001014