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Item#: N82E16815158306CVF

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

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  • Add 4 RS232 serial ports to any PC using a single PCI Express expansion slot
  • RS232 Card
  • PCI Serial Card Adapter
  • PCI Express Serial Card
  • PCI-e Serial Card
  • PCI Express RS232
  • PCIe Serial Card Adapter with Breakout Cable
  • Native single-Chip
  • single lane PCI Express

  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

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 PEX4S552B card.)

Learn more about the STARTECH PEX4S553B




PCI Express to Serial Port Card
External Ports
4 x 9-pin DB-9 Male RS-232 Serial
Data Transfer Rate
250 Kbps
Operating Systems Supported
Windows 95 / 98SE / 2000 / XP(32/64bit) / Server 2003(32/64bit) / Vista(32/64bit) / 7(32/64bit) / Server 2008 R2
Windows XP Embedded / POS Ready 2009 / Embedded System 2009 OS / CE 5.0 / CE 6.0
Mac OS 10.4.x and up
Bus Type: PCI Express
Chipset ID: MosChip MCS9901
Connector Type(s): 1 - PCI Express x1 Male
Microsoft WHQL Certified: Yes
Port Style: Dongle (Included)
Data Bits: 5, 6, 7, and 8
Parity: Even, Odd, None, Space, and Mark
Humidity: 5~85% RH
Operating Temperature: 0°C to 70°C (32°F to 158°F)
Storage Temperature: -40°C to 85°C (-40°F to 185°F)


Automated out-of-band flow control using CTS/RTS and DSR/DTR

Compliant with PCI Express base specifications revision 1.0a

Includes a full profile and low profile/half-height bracket

Native single chip design

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 re-map function for legacy ports (Supported OS's only)

Supports data transfer rates up to 250Kbps on each port

Dimensions & Weight

0.47" x 3.17" x 2.7"
1.76 oz.
Warranty, Returns, And Additional Information
  • 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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