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StarTech.com USB to RS232/RS485/RS422 4-Port Serial Hub Adapter - Industrial Metal USB 2.0 to DB9 Serial Converter with DIN Rail Mount APC Replacement Battery Cartridges Secure connection: Integrated latches ensureStarTech. com USB to RS232 RS485 RS422 4 Port Serial Hub Adapter Industrial Metal USB 2. 0 to DB9 Serial Converter Din Rail Mountable The StarTech. com ICUSB234854I USB serial hub offers a reliable and versatile solution for expanding your computer's serial connectivity, supporting industrial grade equipment and demanding environments. This external device converts a single USB port into four independently configurable RS232, RS422, or RS485 serial