StarTech 2-Port Serial PCIe Card Dual-Port PCI Express to RS232/RS422/RS485 (...

16C1050 UART Windows/Linux TAA Compliant - Level-4 ESD Protection PCIe Serial PCIe 2.0 RS-232/422/485 Black ASIX -. 16C1050 UART Windows/Linux TAA Compliant - Level-4 ESD Protection. 2-PORT PCIE SERIAL CARD: On-board DIP switches allow each DB9 serial port to operate in its own independent mode enabling the connection of RS-232 RS-422 and RS-485 devices; LED indicators to monitor data transmit/receive status.

eBay