If your trying Windows 7 or Vista 64bit, you'll find Belkin don't have 64bit drivers. However, Belkin don't make the drivers anyway. You can checkout this blog post on how to get it working under 64bit Windows: http://www.clearchain.com/blog/posts/how-to-use-a-belkin-f5u409f5u409-cu-usb-to-pda-serial-converter-in-visawindows-7-64bit-mac-osx-10
Belkin F5U109 (serial to usb adapter) driver
Belkin F5U409 USB to Serial adapter driver for Windows 7
Update Driver for Belkin RS232 to USB adapter for HI-PRO - Hearing Aid Self-Fitting and Adjusting [DIY] - Hearing Aid Forum - Active Hearing Loss Community
Belkin F5U109 serial to usb adapter driver
Does anyone has driver for it?on windows 11
If your trying Windows 7 or Vista 64bit, you'll find Belkin don't have 64bit drivers. However, Belkin don't make the drivers anyway. You can checkout this blog post on how to get it working under 64bit Windows: http://www.clearchain.com/blog/posts/how-to-use-a-belkin-f5u409f5u409-cu-usb-to-pda-serial-converter-in-visawindows-7-64bit-mac-osx-10
Found it at: http://clearchain.com/downloads/Belkin\_FU409/U232\_10.2.zip