2-Port USB to RS-232 Hub - UC2322 USB to Serial Hub 2 Port USB to RS232 Serial Hub DB9 2-Port USB to Serial Adapter Hub USB to RS-232 2 Port Serial DB9 Adapter USB to Serial Adapter 2 port Dual Cable - FTDI Dual Port USB to Serial RS-232 DB-9 Adapter Cable FTDI Chip USB 2.0 Dual Twin Serial RS-232 RS232 2 Port Way Convertor Adapter Cable Lead. The USB to 2-Port DB9 Serial Hub is the perfect way to connect serial devices to laptops or PCs with no serial ports. The USB to 2-Port DB9 Serial Adapter is designed for connections to PDAs, digital cameras, modems, ISDN terminal adapters or any other serial devices through your USB port.