PCI-Express connection for increased RS port. The PEX2S PCI Express serial card lets you turn a PCI Express slot into 2 RS (DB9) serial ports. This RS Serial Adapter Card lets you add an RS DB9 serial port to your computer through a PCI Express (PCIe) slot. Reliable 1 Year Product slot to increase the DB9 (D-Sub9 Pin) serial port. This PCI Express RS serial adapter card lets you add two RS (DB9) serial ports to your computer through a PCI Express (PCIe) slot - The replacement. Based on a native single-chip design, this 4-port serial adapter card allows you to harness the full capability offered by PCI Express (PCIe). Based on a native single chip. Serial port. PCI Express. This card offers the RS output for asynchronous connection of I/O. The low profile/half-height PCI Express Serial Card turns a PCI Express slot into two RS (DB9) serial connections. . PCI Express card extend your computer with 2x COM port and 1xL PT-parallel port. It enables you to. It can communicate with. This DriverGenius PEX-RSII multiport PCI Express RS serial adapter card lets you add two RS (DB9) serial ports to your computer through a PCI. Dual serial port: These ports are unique in that they have slots for multiple serial devices aligned next to each other on a small circuit board.