USB to High Speed 1 port RS485 Adapter Expands 1 RS-485 com ports for your system High Speed Baud Rate up to 921.6Kbps Built-in Terminator 120 ohm 32 Device Connectivity for RS-485 Max. Built-in 15KV ESD protection for all Serial Port and RS-485 Signals Protection Supports Microsoft Windows, Linux, and MAC drivers