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StarTech.com 4 Port PCI Express PCIe Serial Combo Card - 2 x RS232 2 x RS422 / RS485 Services ProArt Display PA248CRV has aStarTech. com 4 Port PCI Express PCIe Serial Combo Card 2 x RS232 2 x RS422 RS485 The PEX4S232485 4 Port PCI Express PCIe Serial Combo Card 2 x RS232 2 x RS422 RS485 lets you add two RS232, and two RS422 485 serial ports to your PC through a PCI Express expansion slot. This PCI express serial card is a single card solution that is compatible with nearly any serial communication protocol, supporting RS 232, RS 422, RS 485 2 wire or RS 485 4 wire