StarTech.com USB to DB9 RS232 Serial Adaptor Hubs - StarTech.com ICUSB2324I, The StarTech.com ICUSB2324I 4-Port Industrial USB to Serial Hub with DIN Rail Clips converts a single USB port into four RS232 serial ports, enabling you to connect to, monitor and control your serial devices.With rugged metal construction, sturdy wall-mounting brackets and top-hat DIN Rail clips (included), this hub provides versatile mounting options and a robust solution for both harsh industrial environments and simple desktop installations.This USB-powered adaptor also retains assigned serial COM port values once connected, allowing the same values to be automatically reassigned to the ports provided by the adaptor.This product is backed by a 2-year warranty and free lifetime technical support. StarTech.com ICUSB2324I 4 Port USB To DB9 RS232 Serial Adapter Hub