Startech StarTech.com 4 Port PCI Express PCIe Serial Combo Card serial adapter - PCIe - 4 ports

Includes both low profile/half-height and full profile brackets to ensure fitment into a broad range of system form factors The included breakout cable saves expense as an all-in-one solution, and allows the addition of multiple serial ports through a single PCI Express slot This single PCI Express combo card is compatible with any serial device protocol (RS232, RS422, and RS485), allowing for communication with multiple devices over mixed protocols