[eric@localhost ~]$ ls /dev/*USB*
/dev/ttyUSB0
[eric@localhost ~]$

[eric@localhost ~]$ dmesg | tail -12
application mixer_applet2 uses obsolete OSS audio interface
usb 1-2: new full speed USB device using uhci_hcd and address 2
usb 1-2: configuration #1 chosen from 1 choice
usbcore: registered new driver usbserial
drivers/usb/serial/usb-serial.c: USB Serial support registered for generic
usbcore: registered new driver usbserial_generic
drivers/usb/serial/usb-serial.c: USB Serial Driver core
drivers/usb/serial/usb-serial.c: USB Serial support registered for pl2303
pl2303 1-2:1.0: pl2303 converter detected
usb 1-2: pl2303 converter now attached to ttyUSB0
usbcore: registered new driver pl2303
drivers/usb/serial/pl2303.c: Prolific PL2303 USB to serial adaptor driver

[eric@localhost ~]$ /sbin/lsmod
Module                  Size  Used by
pl2303                 21701  0
usbserial              34317  1 pl2303