well usb to serial connections do work.
at work i use one from my netbook to cisco routers blue console cable however i do have a spare because they are a bit unreliable tbh.
if you have a pc with a serial port i would use that first before using a usb to serial adaptor.
it doesn't have to be a tower any small form factor, desktop or tower from pre 5 years ago will have serial port or ports.