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Item#: N82E16815158254CVF

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

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  • PEX2S553
  • PCI Express to Serial Port Card
  • 460.8 Kbps Data Transfer Rate

  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

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.

Learn more about the STARTECH PEX2S553




PCI Express to Serial Port Card
External Ports
2 x Serial Ports
Data Transfer Rate
460.8 Kbps
Operating Systems Supported
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


Two high speed RS232 serial ports with support for data transfer rates up to 460.8 Kbps
Compliant with PCI Express base specifications revision 1.0a
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
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
Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
  • Read full details
  • Return Policies
    • Return for refund within: 30 days
    • Return for replacement within: 30 days
  • This item is covered by's Standard Return Policy.
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