StarTech 2-Port RS-232 Serial PCIe Adapter Card with 16550 UART (Green)

StarTech 2-Port RS-232 Serial PCIe Adapter Card with 16550 UART (Green)

StarTech 2-Port RS-232 Serial PCIe Adapter Card with 16550 UART (Green)

B&H # STPEX2S553 MFR # PEX2S553
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Expected availability: 3-7 business days

Product Highlights

  • Adds 2 x High-Speed RS-232 Serial Ports
  • Native Single Chip Design
  • PCIe Bus Type
  • Serial Interface
  • 460.8 kb/s Maximum Baud Rate
  • Reduces CPU Load up to 48%
  • CE, FCC, RoHS Certified
  • Windows, Mac, & Linux Compatibility
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StarTech PEX2S553 overview

  • 1Description

The green 2-Port RS-232 Serial PCIe Adapter Card with 16550 UART from StarTech lets you turn a PCIe slot into two RS-232 (DB-9) 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 PCIe, reducing the CPU load by as much as 48% over conventional serial cards. The serial card adapter is compatible with a broad range of operating systems including Windows 2000/XP/2003/Vista/Windows 7/Server 2008 R2 (32/64-bit), Linux Kernel 2.6.11 and above, as well as Mac OS 10.4 and above. Furthermore, the serial card includes an optional half-height/low-profile bracket that allows the card to be installed in any PCIe slot, regardless of the size of the computer case.

Native single-chip, single lane chipset delivers true PCIe performance
Two high-speed RS-232 serial ports support data transfer rates up to 460.8 kb/s
Compliant with PCIe base specification revision 1.0a
Selectable power output on pin 9 of the serial port
128-byte deep FIFO per transmitter and receiver
Automated out-of-band flow control using CTS/RTS and DSR/DTR
Automated in-band software flow control using programmable Xon/Xoff in both directions


Self-service automated machines and kiosks to control serial devices such as scales, touchscreens, magnetic card readers, bar code scanners, receipt printers, and label printers
POS retail applications in grocery stores and any other retail store to control keyboards, cash drawers, receipt printers, card readers/card swipes, scales, and elevated displays on poles
Bank teller workstations in either full-profile or low-profile versions to control serial devices such as cash drawers, card readers/card swipes, printers, keypads / pinpads, and pen pads
Standard ATM (automated teller machines) to control keypads, receipt printer, card readers/card swipes, touchscreen LCDs, camera control, and more
Used to control multiple surveillance/security cameras in parking structures and office buildings, among others
UPC: 065030841740
In the Box
StarTech 2-Port RS-232 Serial PCIe Adapter Card with 16550 UART (Green)
  • 2 x Low-Profile Brackets
  • 1 x Driver CD
  • Limited Lifetime Warranty
  • Table of Contents
    • 1Description

    StarTech PEX2S553 specs

    Interface Serial
    Ports 2
    Bus Type PCIe
    Card Type Standard profile

    Low profile bracket included

    Port Style Integrated on card
    Chipset ID ASIX/MosChip - MCS9922CV-AA
    Type 1 x PCIe x1 male
    Internal Ports 1 x LP4 (4-pin; Molex large drive power) male
    External Ports 2 x DB-9 (9-pin; D-Sub) male
    Baud Rate Maximum: 460.8 kb/s
    Serial Protocol RS-232
    FIFO 128 bytes
    OS Compatibility Windows DOS, 95, 98SE, 2000, CE 5.0/6.0, Embedded System 2009, POS Ready 2009, XP Embedded, XP, Vista, 7, 8, 8.1, 10
    Windows Server 2003, 2008 R2, 2012, 2012 R2, 2016
    Mac OS X 10.4 to 10.10
    Linux kernel 2.6.x to 4.4.x LTS versions
    Humidity 5 to 85% RH
    Compliance CE, FCC, RoHS
    Operating Temperature 14 to 176°F (-10 to 80°C)
    Storage Temperature -4 to 212°F (-20 to 100°C)
    Physical Characteristics
    Dimensions (L x W x H) 4.1 x 4.7 x 0.8" (104.1 x 119.3 x 20.3 mm)
    Weight 2.2 oz (63.5 g)
    Packaging Info
    Package Weight 0.35 lb
    Box Dimensions (LxWxH) 6.6 x 5.6 x 1.3"

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