Review of Linux Compatibility
The Belkin F5U409-CU is a USB-to-Serial port adapter, which has the USB ID 050d:0109:
Bus 004 Device 003: ID 050d:0109 Belkin Components F5U109/F5U409 PDA Adapter
The device is automatically recognized under Linux by the kernel and uses the kernel module mct_u232 as a driver
usb 4-1: new full speed USB device using uhci_hcd and address 3 usb 4-1: configuration #1 chosen from 1 choice usbcore: registered new interface driver usbserial drivers/usb/serial/usb-serial.c: USB Serial support registered for generic usbcore: registered new interface driver usbserial_generic drivers/usb/serial/usb-serial.c: USB Serial Driver core drivers/usb/serial/usb-serial.c: USB Serial support registered for MCT U232 mct_u232 4-1:1.0: MCT U232 converter detected usb 4-1: MCT U232 converter now attached to ttyUSB0 usbcore: registered new interface driver mct_u232 drivers/usb/serial/mct_u232.c: Magic Control Technology USB-RS232 converter driver z2.1
A device /dev/ttyUSB0 is automatically created by the driver.