Star Tech.com 8-Port Industrial USB (Universal Serial Bus) to RS-232/422/485 Serial Adapter Add eight ports supporting three serial protocols, to easily connect serial devices to your computer through USB (Universal Serial Bus), with 15k V ESD protection Features Converts a single USB (Universal Serial Bus) port into eight RS232/RS422/RS485 serial ports over USB (Universal Serial Bus) 2.0 with four modes: RS232, RS422, 4-wire & 2-wire RS485 15 k V ESD protection (Level 4) against noise emissions & electrical voltage surges DIN rail & wall mountable