The FT232R is a compact, low-power chip that converts USB signals to UART signals, allowing communication between a computer and a serial device. The chip supports a wide range of baud rates, from 300 bps to 3 Mbps, and has a 128-byte transmit and receive buffer. The FT232R also features a built-in clock generator, eliminating the need for an external clock source. The chip is compatible with a variety of operating systems, including Windows, macOS, and Linux.

From the perspective of a developer, the driver abstracts all low-level USB complexity, allowing the use of standard OS serial APIs (e.g., CreateFile on Windows, open() on POSIX systems).

The kernel includes the ftdi_sio driver (part of the USB serial subsystem) since kernel 2.6. When an FT232R is plugged in, it loads automatically, creating /dev/ttyUSB0 . Users can configure parameters via stty or termios. For D2XX access, FTDI provides a closed-source library, but many open-source alternatives (e.g., libftdi ) exist.

Common issues include: