-ROOT in shell
-# cd /dev
-# ln -s /dev/ttyUSB1 pilot
-# ln -s /dev/ttyUSB1 palm
-# ln -s /dev/ttyUSB1 visor
-#modconf
-select "kernel/drivers/usb/serial"
-select "visor"
-(commando) "options visor vendor=0xXXXX product=0xXXXX"
(XXXX with your hardware series, you can see them running "usbview" and pushing sync botton)

You can do by hand by editing
/etc/modules.conf
options visor vendor=0xXXXX product=0xXXXX
but it could not work or erease it when your pc do an "update-modules"

- At last you must "reinitiate" your pc