The 4-door PCI Express RS-232 serial card (with dividing cable) Pex4S553B allows you to add four RS-232 serial doors through a single PCIe expansion slot, with a 1 to 4 cable included which allows you to add 4 serial doors to a single profile slot. The serial card has a native single chip design that offers optimal reliability and speed by reducing the CPU load up to 48% compared to conventional serial cards with bridge chip; A convenient solution for the connection of previous generation serial devices to modern computers enabled for PCIe.The multipport serial adapter includes low profile/half height installation brackets to ensure compatibility with computers with a reduced and standard form factor; It is also compatible with a wide range of operating systems, including Windows®, Linux and Mac Os.Thus Article replaces the Pex4S52B card card.