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Add 4 isolated RS-422/RS-485 serial ports to your system with StarTech PCI4S422ISO PCI card. Dip switches located on the card let you choose between RS-422 and RS-485 formats for each port, depending on the application you need. The DB9 connectors let you connect many types of popular serial peripherals, like networking devices, high speed modems, monitoring equipment, long distance communication devices and printers. Suitable for industrial applications, this card is compatible with a wide range of operating systems, including Windows, DOS, Linux, and Unix.