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. It enables you to. 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 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. 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. . This RS Serial Adapter Card lets you add an RS DB9 serial port to your computer through a PCI Express (PCIe) slot. 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). PCI Express. Serial port. PCI Express card extend your computer with 2x COM port and 1xL PT-parallel port. Based on a native single chip. It can communicate with.