USB to Serial Converter is packaged in DB9 form factor.
CE-USB USB2.0-to-RS232 adapter uses DB9 pcb pad pinout to allow updates to older serial products without any layout changes, and adds USB interface into existing serial products with no software or hardware redesign required. Device draws 35 mA from USB port, and drivers allow it to appear to operating system as additional COM port. It sends 8-bit asynchronous serial data at selectable speeds between 300-921.6 Kbps. All RS-232 signals, including handshakes, are available.