SIIG''s 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 four RS-422/485 ports to your PC or Mac system via USB port. It supports serial port data transfer rates of up to 128 Kb/s with built-in 15KVDC 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.The 4-Port Industrial USB to RS-422/485 Serial Adapter Cable with 3KV Isolation Protection is compliant with USB 2.0 specification, FCC & CE regulatory approved, and RoHS-compliant. It is also compatible with a wide variety of Windows and Mac operating systems and backed by SIIG''s limited 3-year warranty.