StarTech.com PCI Express RS232 Serial Adapter Card - 4 Port PCIe Serial Card

StarTech.com PEX4S553B

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Manufacturer Part#  PEX4S553B

UPC Code: 065030842556

Provantage Code:  STR925E

Condition:  Factory New

  • Host Interface: PCI Express x1
  • Maximum Data Transfer Rate: 1.95 Mbit/s
  • TAA Compliant: Yes

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StorageI/O and Storage ControllersMultiport Serial Adapters


StarTech.com PEX4S553B Specifications

    PCI Express RS232 Serial Adapter Card - 4 Port PCIe Serial Card

At a Glance

    In the Package
    • Native single chip design
    • Includes a full profile and low profile/half-height bracket
    • On chip 256-byte depth FIFO in transmit/receive path of each port
    • Single-Lane (x1) PCI-Express with throughput up to 2.5Gbps
    • Supports hardware and software flow control
    • Supports data transfer rates up to 250Kbps on each port
    • Compliant with PCI Express base specifications revision 1.0a
    • Automated out-of-band flow control using CTS/RTS and DSR/DTR


    Rear View

    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

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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

Additional Product Images


Product NamePCI Express RS232 Serial Adapter Card - 4 Port PCIe Serial Card
Manufacturer Part NumberPEX4S553B
Product TypeMultiport Serial Adapter
TAA CompliantYes
Form FactorPlug-in Card
Host InterfacePCI Express x1
Environmentally FriendlyYes
Maximum Data Transfer Rate1.95 Mbit/s
Country of OriginChina
Ports Expandability4 x DB-9 RS-232 - Serial, Via Cable
Limited WarrantyLifetime
System RequirementsOS 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
Platform SupportedPC



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Purchase a minimum of $3,000 of StarTech Products

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