STARTECH 

PEX4S553B StarTech.com 4 Port RS232 PCI Express Serial Card w/ Breakout Cable

Mfg Part Number:  PEX4S553B  
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Price: $107.99
Quantity:
More to Come
Last Updated: Nov 12, 2025
No Sales Tax except these states
, PO and Wire.

The PEX4S553B 4-Port PCI Express Serial Card (with breakout cable) lets you add 4 RS232 serial ports using a single PCIe expansion slot, with an included 1-to-4 cable enabling you to add 4 serial ports to a single low profile slot.

The serial card features a native single-chip design that provides optimum reliability and speed, reducing the CPU load by up to 48% over conventional bridge-chip serial cards - a cost-effective solution for connecting legacy serial devices to PCIe-enabled computers.

The multi-port serial adapter includes both full profile and low profile/half-height brackets for compatibility with standard and small form factor computers, and is compatible with a broad range of operating systems, including Windows®, Linux, and MAC OS.

This product is a replacement for our PEX4S552B card.

Backed by a StarTech.com lifetime warranty and free lifetime technical support.

More from the Manufacturer

Main Specification
General Information
Manufacturer StarTech.com
Manufacturer Part Number PEX4S553B
Manufacturer Website Address http://www.startech.com
Brand Name StarTech.com
Product Name 4 Port RS232 PCI Express Serial Card w/ Breakout Cable
Packaged Quantity 1 Each
Product Type Multiport Serial Adapter
Technical Information
Host Interface PCI Express x1
Maximum Data Transfer Rate 1.95 Mbit/s
Platform Supported PC
Platform Supported Mac
Platform Supported Linux
Interfaces/Ports
Ports Expandability 4 x DB-9 RS-232 - Serial, Via Cable
Physical Characteristics
Form Factor Plug-in Card
Height 2.7"
Width 0.5"
Weight (Approximate) 8.40 oz
Miscellaneous
Package Contents
  • 4 Port RS232 PCI Express Serial Card w/ Breakout Cable
  • 1 x DB9 Breakout Cable
  • 1 x Full Profile Bracket
  • 1 x Driver CD
  • 1 x Instruction Manual
System Requirements

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® 10.4 to 10.10
  • Linux 3.5.x to 4.11.x LTS Versions Only
Country of Origin China
TAA Compliant Yes
Environmentally Friendly Yes
Warranty
Limited Warranty Lifetime
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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