StarTech.com 4 Port PCI Express PCIe Serial Combo Card with Breakout Cable - 2 x RS232 2 x RS422 / RS485 - Dual Profile Add two RS232 and two RS422/485 serial ports to your PC through a PCI-Express expansion slot 4 Port PCI Express PCIe Serial Combo Card 4 port (2 x RS232, 2 x RS422/485) serial combo card Interface (bus) Type: PCI Express x1 Includes both low profile/half-height and full profile brackets to ensure fitment into a broad range of system form factors 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 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 4 port (2 x RS232, 2 x RS422/485) serial combo card RS232 data transfer rates up to 460 Kbps Supports 2-Wire / 4-Wire RS485 modes 256-byte deep FIFO per transmitter and receiver Standard and low-profile bracket included