It appears that my UPS has detached.  Is there a programmatic way to reset a 
USB port?  I'm confident if I unplug the UPS and plug it back in it will 
reattach, but I don't have physical access to the server.  I'd prefer not to 
reboot either.  Thanks.

  FROM DMESG
uhidev0 at uhub1 port 1 configuration 1 interface 0 "American Power Conversion 
Smart-UPS 1500 FW:601.3.D USB FW:1.3" rev 1.10/0.06 addr 2
uhidev0: iclass 3/0, 54 report ids
upd0 at uhidev0
  FROM /var/log/messages
Nov 23 15:54:29 builder02 /bsd: upd0 detached
Nov 23 15:54:29 builder02 /bsd: uhidev0 detached

-Steve S.

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