DB9-USB-RS232 USB 2.0 Modules FTDI DB9-USB-RS232 USB 2.0 Modules provide a simple and fast method of migrating existing DB9-based RS232 connector interfaces to USB 2.0 without the need for any board redesign. FTDI DB9-USB-RS232 modules feature a USB 2.0 mini-B connector on a module that fits a standard 9-pin DB9 connector footprint. The DB9-USB-RS232 comes in male or female versions to replace the male or female DB9 connector versions in systems equipped with legacy DB9-based RS232 connectors.