Sys - Ftdibus

Have you experienced the infamous counterfeit driver lockout? Or do you still use FTDI chips in new projects? Let me know in the comments below.

Published: April 14, 2026 | Reading time: 7 minutes ftdibus sys

In simple terms, ftdibus.sys allows Windows to communicate with FTDI chips over USB. When you plug in a device containing an FTDI chip, Windows loads this driver, which creates a virtual COM port (e.g., COM3 ). Your terminal software (PuTTY, Tera Term, etc.) then uses that COM port to send and receive serial data. Have you experienced the infamous counterfeit driver lockout