[BRLTTY] Information about vario with usb port

[Sauro Cesaretti]

Hi,
I need an information about the parameters that I must pass on brltty to use
the vario display with one adapter serail-usb.
I have one display serial and I connected it on the usb port using one 
adapter, but
now I don't know what are the correct parameters to use this display.
Thanks in advance for all information.
Best Regards,
Sauro