StarTech.com ICUSB23216F USB to Serial Hub &ndash; 16 Port &ndash; COM Port Retention &ndash; Rack Mount &ndash; FTDI USB to RS232 Hub &ndash; USB Serial DB9 (9-pin) Convert a Single USB Port into 16 RS232 Serial Ports in a Hardened Industrial-grade Rack-mountable Chassis USB to Serial USB to RS232 USB to DB9 USB to Serial Adapter