STARTECH 

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

Mfg Part Number:  PEX2S553  
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Price: $56.56
Quantity:
More to Come
Last Updated: Nov 10, 2025
No Sales Tax except these states
, PO and Wire.

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® and 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

More from the Manufacturer

Main Specification
General Information
Manufacturer StarTech.com
Manufacturer Part Number PEX2S553
Manufacturer Website Address http://www.startech.com
Brand Name StarTech.com
Product Model PEX2S553
Product Name 2 Port PCIe Serial Adapter Card with 16550
Packaged Quantity 1
Product Type Serial Adapter
Technical Information
Host Interface PCI Express x1
Data Transfer Rate 460.8kB/s
UART Type 16550
Platform Supported PC
Platform Supported Mac
Platform Supported Linux
Interfaces/Ports
Number of Serial Ports (External) 2
Physical Characteristics
Form Factor Plug-in Card
Card Height Half-height/Low-profile
Height 0.8"
Width 4.7"
Length 4.1"
Weight (Approximate) 2.20 oz
Miscellaneous
Package Contents
  • 2 Port PCIe Serial Adapter Card with 16550
  • Low Profile Brackets
  • Driver CD
  • Instruction Manual
Additional Information
  • 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
Environmentally Friendly Yes
Country of Origin Taiwan
Warranty
Limited Warranty 2 Year
product information
WARNING:: The plastic used in cable products can expose you to lead and lead components, chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to www.P65Warnings.ca.gov
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