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Item#: N82E16815158305

StarTech 2 Port RS232 PCI Express Serial Card w/ Breakout Cable Model PEX2S553B

  • PCI Express to Serial Port Card
  • 250 Kbps Data Transfer Rate

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

The PEX2S553B 2-Port PCI Express Serial Card w/ Breakout Cable lets you add two RS232 serial ports using a single PCIe expansion slot. With the included break-out cable, you can easily add two ports to a single low profile slot.

The PCIe 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 multiport PCIe Serial Adapter includes both full 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 7/Server 2008 R2, 2003/Vista/XP (32 and 64 bit), Linux Kernel 2.6.11 and up, as well as MAC OS 10.5 and above.

  • newegg 2-Port PCI Express Serial Card This 2-Port PCI Express Serial Card features a breakout cable design that uses one expansion slot to add 2 serial ports to any system, supporting data transfer rates up to 250Kbps on each port. Included standard and low profile/half-height brackets make this the perfect card for any application including small form factor embedded applications.
  • newegg Native Single Chip Design Lower CPU load of native single-chip, single lane PCI Express design ensures optimal system performance (up to 48% less CPU load).
  • newegg Support Hardware and Software Flow Control This 2-Port PCI Express Serial Card supports automated out-of-band flow control using CTS/RTS and DSR/DTR.

Learn more about the STARTECH PEX2S553B




PCI Express to Serial Port Card
External USB Ports
PCI Express
External Ports
2 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 MCS9922
Connector Type(s): 1 - PCI Express x1 Male
Microsoft WHQL Certified: Yes
Data Bits: 5, 6, 7, and 8
Stop Bits: 1 or 2
Parity: Even, Odd, None, Space, and Mark
Flow Control: Hardware and Software
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)


Full profile and low profile/half-height brackets included

Native single-chip design

Single-Lane (x1) PCI-Express with throughput up to 2.5Gbps

On-chip 256-byte depth FIFO in transmit/receive path of each port

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

Supports data transfer rates up to 250Kbps on each port

Compliant with PCI Express base specifications revision 1.0a

Dimensions & Weight

0.55" x 3.19" x 2.7"
1.62 oz.


Package Contents
1 x PCI Express Serial Card
1 x DB9 breakout cable
1 x Full Profile Bracket
1 x Driver Installation CD
1 x Instruction Manual
Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): Lifetime
  • Limited Warranty period (labor): Lifetime
  • Read full details

Customer Reviews of the STARTECH PEX2S553B

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  • Anonymous
  • 9/15/2014 7:53:59 AM
  • Ownership: 1 week to 1 month

5 out of 5 eggseasy to install and use

Pros: works as advertised; using with a USR serial RS232 modem

Cons: none that I can find at this time

Other Thoughts: recommended and would buy again

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Item#: N82E16815158305
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