I have this APC BACK-UPS, it is a personal UPS for my PC. I used it for windows and it works fine. WIth redhat 9.0 I need to specify a port in the config file. The default is my 1st serial port /dev/ttyS0. This device uses a USB connection. How do I figure out what to put down for a USB port? I'm sure its somewhere in /dev.