Add 16 RS232 serial ports (DB9) to your low or full-profile computer, through a PCI Express slot - 16-Port PCI Express Serial Card - Low-Profile - High-speed PCIe serial card with 16 DB9 RS232 Ports (up to 921.6 Kbps) - Multiport serial adapter card
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 - PCI Express RS485 / PCIe RS485 / PCI Express RS422 / PCIe RS422 serial combo card - Dual Profile PCIe serial card adapter with breakout cable - RS232 data transfer rates up to 460 Kbps - PCIe serial combo card supports 2-Wire / 4-Wire RS485 modes - Compliant with PCI-Express Specification 1.0a