[BRLTTY] brltty over usb-serial bridge

[aerospace1028 at hotmail.com]

greetings,
How does one connect a serial braille display to brltty through a usb-serial bridge?

I tried

#brltty -b bn -d serial:ttyS0
#brltty -b bn -d serial:ttyS1
#brltty -b bn -d serial:ttyS2
#brltty -b bn -d serial:ttyS3
#brltty -b bn -d usb

and none of these seams to work.  I am trying to connect to an ubuntu (8.04) laptop.  any advice would be welcomed.
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