The EX-1339HMVS USB 2.0 to serial RS-232/422/485 with Surge Protection and Optical Isolation in a metal case, provides eight high performance 16C550-type UART compatible RS-232, 422 or 485 serial ports with 15KV ESD Surge Protection and 2.5KV Optical Isolation. It is designed for PC or Notebooks to provide instant COM port expansion in a robust metal case through the USB 2.0 bus. With the easy installation you don’t need to open the computer system and install the EX-1339HMVS when the system run. With the USB cable EX-K1552V (2 meter) A-male to B-male you can fix the connector with screw. The cable can’t be disconnect any more by him self. Included it’s also the EX-6099 (DIN-Rail-Kit) for install the EX-1339HMVS to a Din-Rail in a 19 inch Rack. The EX-1339HMVS has LED displays for operation functions and data communication. The EX-1339HMVS can expand with other 14 Module (EX-1339HMVS). Total you add up to 112 serial ports more to your computer system.