This PCI Express RS-232 serial adapter card lets you add four RS-232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot. The 4-port PCIe serial card enables you to interact with serial devices, such as card readers, printers, PIN pads, and modems, at speeds of up to 921.4 Kb/s. This serial PCI Express RS232 adapter card includes both low profile/half-height slots for flexible installation; supports Windows XP and later and Linux. For standard/low profile desktop/servers with uses in point of sale terminals, PLCs, control/automation in factories, scientific sensors, medical equipment, scanners, oscilloscopes.