StarTech.com 4-port PCI Express RS232 Serial Adapter Card, PCIe RS232 Serial Host Controller Card, PCIe to Serial DB9 Card, 16950 UART, Desktop Expansion Card, Windows, macOS, Linux - Full/Low-Profile Brackets (PEX4S953) - Serial adapter - PCIe - RS-232 x 4

This adapter card lets you add four RS-232 serial ports to your computer through a PCIe slot, as if they were native serial ports. The dual port PCIe serial card enables you to interact with serial devices, such as card readers, printers, PIN pads, and modems. The card comes pre-configured with a full-profile bracket, and includes low-profile brackets, so installation is easy regardless of the case form factor.