StarTech.com 4 Port PCIe Serial Adapter Card with 16550Elevate legacy device connectivity with four independent RS 232 serial ports brought to life through a single PCIe expansion card. The PEX4S553 delivers robust, reliable serial communication by leveraging a native PCI Express design and four 16550 UART engines, making it an ideal upgrade for workstations, industrial PCs, and control systems that rely on dependable RS 232 interfaces. With one PCIe slot, you can consolidate multiple serial connections