StarTech.com 2 Port Native PCI Express RS232 Serial Adapter Card with 16550

StarTech.com PEX2S553

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Model PEX2S553

UPC Code: 065030841740

Provantage Code:  STRN02K

Condition:  Factory New

  • Product Type: Serial Adapter
  • Country of Origin: Taiwan
  • Limited Warranty: 2 Year
  • Form Factor: Plug-in Card
  • Product Model: PEX2S553
  • TAA Compliant: Yes

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StorageI/O and Storage ControllersSerial/Parallel I/O Adapters


StarTech.com PEX2S553 Specifications

    2 Port Native PCI Express RS232 Serial Adapter Card with 16550

At a Glance

    Rear View
    • 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


    Top View

    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 to 4.11.x, 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 StarTech.com 2-year warranty and free lifetime technical support.

    More from the Manufacturer


    Bottom View

    • Native single-chip, single lane PCI Express chipset delivers true PCIe performance.
    • Standard and low profile/half-height bracket included to ensure fitment in any system.
    • Easy to install and use with full step-by-step instructions saving time and hassle.

    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, 2019
    • Mac OS X® 10.4 to 10.10
    • Linux kernel 2.6.x to 4.11.x LTS Versions only

Package Contents

    Front View

    • 2 Port PCIe Serial Adapter Card with 16550
    • Low Profile Brackets
    • Driver CD
    • Instruction Manual


Product Name2 Port Native PCI Express RS232 Serial Adapter Card with 16550
Product TypeSerial Adapter
Number of Serial Ports (External)2
Form FactorPlug-in Card
Host InterfacePCI Express
Environmentally FriendlyYes
Environmental CertificationRoHS
Card HeightLow-profile
Country of OriginTaiwan
Product ModelPEX2S553
Platform SupportedPC



Limited Warranty2 Year
UART Type16550
Data Transfer Rate460.8kB/s
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Supplies/Accessories for StarTech.com PEX2S553

StarTech.com 6 ft Straight Through Serial Cable - DB9 M/F

Mfg Part# MXT100

StarTech.com 10 ft DB9 RS232 Serial Null Modem Cable F/M

Mfg Part# SCNM9FM

StarTech.com 6 ft Straight Through Serial Cable - DB9 F/F

Mfg Part# MXT100FF

Considering a Volume Purchase?
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Purchase a minimum of $3,000 of StarTech Products

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StarTech.com Model PEX2S553