StarTech.com 2-Port Serial PCIe Card, Dual-Port RS232/RS422/RS485 Card, 16C1050 UART, ESD Protection, Windows/Linux, TAA-Compliant - 2-Port PCIe Serial Card features on-board DIP switches allowing each DB9 port to operate in RS-232/RS-422/RS-485 independently; Jumpers provide the option of 12V/5V/RI @ 1.5A per port; Includes Low-Profile Brackets; Supports Windows/Linux