MOXA UPort 1150 USB to serial converter :

Moxa's UPort series USB-to-serial converters provide computers with high-performance, industrial-grade connections for up to 16 serial devices over a single USB port. A wide range of converters are available with features that include Hi-Speed USB 2.0 with data rates up to 480 Mbps, advanced UARTs for high-end serial performance, COM port mapping, fixed-base COM functionality, and more.