Convert your DB9 serial device to USB. The USB to DB9 serial adapter from Cables To Go provides the connection between USB and the traditional RS-232 serial port. The adapter is designed for connections to cellular phone, PDA, digital cameras, modems, or ISDN terminal adapters through your USB port with over 230 kbps data transfer rate. Since the adapter uses no IRQs, it is perfect if you have many serial devices attached to your PC.