USB converters are designed to make serial port expansion quick, easy and simple. Connecting to a USB port on computer or USB hub, the converter instantly adds a RS232 serial communication port to system. It is automatically detected and installed upon connection to the USB port. There are no interrupt request port conflicts, since the port do not require any additional interrupt request, direct memory access, memory as resources on the system. The converter is powered by the USB port-no external power required.