These USB to serial port adapters can be used to connect your serial devices to your modern PC. USB to DB9 serial adapters allow you to connect a parallel printer to your USB port, in addition to a number of other uses. Looking to buy a USB to Serial converter online? Connect Serial devices to any USB port with our array of cheap USB to Serial adapters. We carry serial adapter for Mac and Windows and at the lowest prices! A 9 pin serial to usb adapter lets you convert USB to older serial connections. With a USB to serial converters cable and serial to USB adapters and converters of varying length and size, you're bound to find the perfect USB to serial converter for all your needs!