... converter 1.Plug and play compliant, hot swappable 2.Add 1 to 4 serial ports USB HUB to 4 ports RS232 converterA quick ... one, two, four, eight or sixteen serial ports, as well as parallel and USB ports on some models. Compatible with most Windows ... no external power needed on USB to serial models, or 5VDC power supply. Communication Standard Accord USB1.1 or 2.0, EIA RS232 ...