The PCI4S550N 4-port PCI Serial card turns an available PCI slot into four RS232 serial ports - a cost-effective solution for connecting any new or old serial peripheral, with support for data transfer rates of up to 115Kbps.The PCI Serial card is a perfect solution for connecting serial modems, POS devices, PDAs, digital cameras, printers, ISDN terminal adapters and more, to your system without having to upgrade your peripheral devices for compatibility with newer standards (e.g. USB).Saving time and hassle, the Serial PCI card is plug-and-play ready, and can be installed in minutes, supporting Windows 7, Server 2008 R2, Vista, XP, ME, 2000, 98, 95, NT4, 3.1, DOS and Linux operating systems. Plus, the serial card offers IRQ sharing to help ensure stability and consistent performance, guaranteeing convenient, hassle-free connections. Backed by a StarTech.com lifetime warranty and free lifetime technical support.