“StarTech.com 4 Port PCI Express PCIe Serial Combo Card – 2 x RS232 2 x RS422 / RS485 – Add two RS232, and two RS422/485 serial ports to your PC through a PCI-Express expansion slot – pcie rs485 – pci express rs485 – pcie rs485 – pci express rs422 – pcie rs422 SERIAL CARD” has been added to your cart. View cart