This 2 Port Professional Grade USB Serial Adapter converts a single USB port to two RS232 Serial Ports. Once connected, the adapter retains assigned serial COM port values, allowing the same values to automatically be re-assigned to the serial ports provided by the adapter in the event of disconnection/re-connection to the host computer.This innovative Serial adapter offers a professional grade solution for connecting legacy or industrial RS232 serial devices to more modern computers, or computers with unused USB ports perfect for connecting serial modems, barcode scanners or any device with serial sync to a host computer USB port, eliminating the expense of upgrading serial peripherals for USB compatibility.