The 4-port industrial USB to RS-422/-485 serial adapter cable with 3kV isolation protection is a high quality industrial USB plug and play adapter cable designed to instantly add a RS-422/-485 port to PC or Mac system via USB port. It supports serial port data transfer rates of up to 128kbps with built-in 15kV DC ESD serial interface protection and 3kV optical coupling isolation. It is the ideal solution for connecting industrial devices such as laboratory testing and measuring equipment, monitoring devices, material handling equipment and many more devices where mission critical applications are required. Compatible with a wide variety of Windows and Mac operating systems.