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

Add RS232 DB9 capabilities without purchasing a new server or computer PCI Express 1.1 compliant, ensuring wide compatibility Maximize case form factor integration with a low-profile or full profile brackets Supports 256-byte depth FIFO cache per transmitter and receiver High-speed data transfer rates of up to 921.6Kbps