Add four COM ports supporting three serial protocols to easily connect serial devices to your computer through USB with 15 kV ESD protection - 4-Port Industrial USB to RS-232/422/485 Serial Adapter with data transfer baud rate up to 921.6Kbps - Converts a single USB port into four RS232/RS422/RS485 serial ports over USB 2.0 with 4 modes: RS232 / RS422 / 4-wire and 2-wire RS485 - DIN Rail / Wall Mountable USB to Serial Adapter with rugged IP30 rated metal housing and screw-locking host connection