StarTech IO PEX2S553 2 Port Native PCI-Express RS232 Serial Adapter Card with 16550 UART


SKU: 104861 MPN: PEX2S553UPC: 65030841740

57 in stock

The PEX2S553 PCI Express serial card lets you turn a PCI Express slot into 2 RS232 (DB9) serial ports. Based on a native single chip design (no bridge chip), this 2-port serial adapter card allows you to harness the full capability offered by PCI Express (PCIe), and reducing the load applied to the CPU by as much as 48% over conventional serial cards.

The RS232 Serial Adapter Card (PEX2S553) is compatible with a broad range of operating systems including Windows® 2000/XP/2003/Vista™/Windows 7/Server 2008 R2 (32 and 64 bit), Linux Kernel 2.6.11 and up, and MAC OS 10.4 and above.

Plus, the serial card includes an optional half-height/low profile bracket that allows the card to be installed in any PCI Express slot, regardless of the size of the computer case.

This product is a replacement for our PEX2S552 card.

Backed by a Lifetime warranty and free lifetime technical support.


• Two high speed RS232 serial ports with support for data transfer rates up to 460.8 Kbps

• Includes half-height/low profile mounting bracket

• Selectable power output on pin 9 for the serial port

• 128-byte deep FIFO per transmitter and receiver

• Native single-Chip, single lane PCI Express

  • Warranty

    Bus Type
    PCI Express

    Carton Quantity


    Connector Types
    2 – DB9 Male

    Maximum Date Transfer Rate
    460.8 Kbps

    Selectable power output on pin 9 of the serial port

    Number of Ports

    Product Height

    Product Length

    Product Weight

    Product Width

    Shipping (Package) Weight
    0.42 lb 0.19 kg

    x1, x2, x4, x8, x16(lane)

    Card Type
    Low / Standard Profile

    585% RH

    Operating Temperature
    -20C to 85C (-4degF to 185F)

    Storage Temperature
    -40C to 85C (-40degF to 185F)

    Chipset ID
    MosChip MCS9922CV-AA

    OS Compatibility
    DOS, Windows 95/ 98SE/ 2000/ XP(32/64bit)/ Server 2003(32/64bit)/ Vista(32/64bit)/ 7(32/64bit)/ Server 2008 R2, Linux, and Mac OS 10.4.x and up
    Windows XP Embedded/ POS Ready 2009/ Embedded System 2009 OS/ CE 5.0/ CE 6.0

0.42 lbs


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SKU: 104861 Category: MPN: PEX2S553UPC: 65030841740