hooked up a APC Smart-UPS 1500 (SMT1500) to dean3 via USB.  dmesg spits out:

usb 2-1.2: new full speed USB device using ehci_hcd and address 3
usb 2-1.2: configuration #1 chosen from 1 choice
hiddev96: USB HID v1.00 Device [American Power Conversion Smart-UPS 1500 FW:COM 02.1 / UPS.05.D] on usb-0000:00:1d.0-1.2
 

With the APC CD in the drive, installed the PowerChute agent for Linux:

rpm -ivh pbeagent-8.5.0-626.i386.rpm
 

and run the setup script:

/opt/APC/PowerChuteBusinessEdition/Agent/config.sh

It adds a "PBEAgent" service and starts it automatically.

Use the following ports for PowerChute Business Edition with a firewall:

    To access the Agent User Interface (Web UI) remotely, use
    - 3052: TCP protocol
    To communicate with the Server or Console, use
    - 2161: TCP protocol
    - 2161: UDP protocol
 

For Signal Type, I selected "[1]: Smart", though have no idea if that's correct.  And next it asks for a serial port.  Since I connected it via USB cable, I'm stumped.  To Google I go...  Found some indications that PowerChute on Linux doesn't work with USB.  So I need to go back to the experiment and use the serial cable instead of the USB cable.  <Sigh>  And/or try apcupsd as an alternative...