USB-serial setup

[Saifi Khan]

Hi:

A USB-serial adapter has been connected to my Compaq C301TU
laptop. the other end connects to my AMD64 X2 box. 

Both the systems are running DragonFly BSD 2.4.1.

On the laptop, the USB-serial device is detected as
ugen0: <Prolific Technology Inc. USB-Serial Controller, class
0/0, rev 1.10/3.00, addr 2> on uhub0


The entries in the /dev directory look like

crw-r--r--  1 root  operator   27, 0x00000000 Oct 22 09:33 /dev/ugen0
crw-r--r--  1 root  operator   27, 0x00000001 Oct 22 09:33 /dev/ugen0.1
crw-r--r--  1 root  operator   27, 0x00000002 Oct 22 09:33 /dev/ugen0.2
crw-r--r--  1 root  operator   27, 0x00000003 Oct 22 09:33 /dev/ugen0.3


The output of the usbdevs -d -v command is

Controller /dev/usb0:
addr 1: full speed, self powered, config 1, UHCI root hub(0x0000), Intel(0x0000), rev 1.00
  uhub0
 port 1 addr 2: full speed, power 100 mA, config 1, USB-Serial Controller(0x2303), Prolific Technology Inc.(0x067b), rev 3.00
   ugen0
 port 2 powered
Controller /dev/usb1:
addr 1: full speed, self powered, config 1, UHCI root hub(0x0000), Intel(0x0000), rev 1.00
  uhub1
 port 1 powered
 port 2 powered
Controller /dev/usb2:
addr 1: full speed, self powered, config 1, UHCI root hub(0x0000), Intel(0x0000), rev 1.00
  uhub2
 port 1 powered
 port 2 powered


The generic 'ucom' driver has been loaded using

laptop# kldload -v ucom
Loaded ucom, id=5


My query is:
i donot see any cua0, ttyS0, ttyUSB0,
so, what is the virtual serial device to be specified while running cu ?
ie.
 #  cu -s 19200 -l /dev/<device>


thanks
Saifi.