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The Comtrol RocketPort EXPRESS Quadcable DB25 Serial Adapter is designed to be used with standard and low-profile PCs and servers. This 4-port serial adapter is compatible with devices that have x1, x4, x8 or x16 PCI Express expansion slots. It is designed to support RS-232, RS-422 and RS-485 serial communications at a transfer speed of 921.6 Kb/s.