APC UPS

-Anyone use an APC Uinterruptible Power Source BK 350 with Linux?
There is an RJ45-USB cable, but they say the USB cable will not work
with Linux, and I need an RJ45 to Serial cable.  Thw software that goes with
it (PowerChute for Linux) asks which serial port you want to use it with so it
must need a serial port.

I am using CentOS and there is pl2303 and usbserial, but that doesn't seem to recognize
the USB port I plugged the machine into.  However, hwbrowser shows

     American Power Conversion Back-UPS Pro 500/1000/1500

under system devices, when the USB port is connected.

Any idea how to access it through a serial port?  I can't find /dev/ttyUSB*