StarTech.com 2-port PCI Express RS232 Serial Adapter Card - PCIe to Dual Serial DB9 RS-232 Controller - 16950 UART - Windows and Linux

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243 availableas of 09/19/2026

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Compliance, certifications and origin

  • EU RoHS
  • REACH
  • WEEE
  • RoHS
  • Origin: Taiwan
Rated excellent by our customers Read our reviews

Secure checkoutISO 9001:2015 and CMMC certifiedFamily owned since 1982

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Secure checkoutISO 9001:2015 and CMMC certifiedFamily owned since 1982

Free shipping on most items when you spend $100 or more.

Real people answer: chat with us, email customerservice@colamco.com, or call 1-800-692-8757, Monday to Friday, 8am to 5pm EST.

Overview

About the StarTech.com 2-port PCI Express RS232 Serial Adapter Card - PCIe to Dual Serial DB9 RS-232 Controller - 16950 UART - Windows and Linux

View user manual

This multiport PCI Express RS232 serial adapter card lets you add two RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot, as if they were native serial ports. The dual port PCIe serial card enables you to interact with serial devices, such as card readers, printers, PIN pads, and modems, at speeds of up to 921.6Kbps.

Maximum Compatibility

With broad OS support, including for Windows and Linux, this 2 port PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with a full-profile bracket, and includes optional low-profile brackets, so installation is easy regardless of the case form factor. This card is a direct replacement for PEX2S952 .

Experience Optimal Technology

This PCIe to serial adapter supports the following features:

  • Industry standard 16950 UART compatible
  • Supports max baud rate of up-to 921.6Kbps
  • Provides 5/12V power output on Pin 9 when external power is connected
  • 256-byte depth FIFO cache per transmitter and receiver
  • Supports 9, 8, 7, 6, 5 data bits (one per port)
  • Asix AX99100 chipset
  • Base PCI Express 1.1 compliant
  • Low and full-profile brackets included

The Choice of IT Pros Since 1985

StarTech.com conducts thorough compatibility and performance testing on all our products to ensure we are meeting or exceeding industry standards and providing high-quality products to IT Professionals. Our local StarTech.com Technical Advisors have broad product expertise and work directly with our StarTech.com Engineers to provide support for our customers both pre and post-sales.

PEX2S953 is backed by a StarTech.com lifetime warranty and free lifetime technical support.

More from the Manufacturer This multiport PCI Express RS232 serial adapter card lets you add two RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot, as if they were native serial ports. The dual port PCIe serial card enables you to interact with serial devices, such as card readers, printers, PIN pads, and modems, at speeds of up to 921.6Kbps. Maximum Compatibility With broad OS support, including for Windows and Linux, this 2 port PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with a full-profile bracket, and includes optional low-profile brackets, so installation is easy regardless of the case form factor. This card is a direct replacement for PEX2S952 . Experience Optimal Technology This PCIe to serial adapter supports the following features: Industry standard 16950 UART compatible Supports max baud rate of up-to 921.6Kbps Provides 5/12V power output on Pin 9 when external power is connected 256-byte depth FIFO cache per transmitter and receiver Supports 9, 8, 7, 6, 5 data bits (one per port) Asix AX99100 chipset Base PCI Express 1.1 compliant Low and full-profile brackets included The Choice of IT Pros Since 1985 StarTech.com conducts thorough compatibility and performance testing on all our products to ensure we are meeting or exceeding industry standards and providing high-quality products to IT Professionals. Our local StarTech.com Technical Advisors have broad product expertise and work directly with our StarTech.com Engineers to provide support for our customers both pre and post-sales. PEX2S953 is backed by a StarTech.com lifetime warranty and free lifetime technical support. More from the Manufacturer

This multiport PCI Express RS232 serial adapter card lets you add two RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot, as if they were native serial ports. The dual port PCIe serial card enables you to interact with serial devices, such as card readers, printers, PIN pads, and modems, at speeds of up to 921.6Kbps.

Maximum Compatibility

With broad OS support, including for Windows and Linux, this 2 port PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with a full-profile bracket, and includes optional low-profile brackets, so installation is easy regardless of the case form factor. This card is a direct replacement for PEX2S952 .

Experience Optimal Technology

This PCIe to serial adapter supports the following features:

  • Industry standard 16950 UART compatible
  • Supports max baud rate of up-to 921.6Kbps
  • Provides 5/12V power output on Pin 9 when external power is connected
  • 256-byte depth FIFO cache per transmitter and receiver
  • Supports 9, 8, 7, 6, 5 data bits (one per port)
  • Asix AX99100 chipset
  • Base PCI Express 1.1 compliant
  • Low and full-profile brackets included

The Choice of IT Pros Since 1985

StarTech.com conducts thorough compatibility and performance testing on all our products to ensure we are meeting or exceeding industry standards and providing high-quality products to IT Professionals. Our local StarTech.com Technical Advisors have broad product expertise and work directly with our StarTech.com Engineers to provide support for our customers both pre and post-sales.

PEX2S953 is backed by a StarTech.com lifetime warranty and free lifetime technical support.

More from the Manufacturer

More from the manufacturer

Technical specifications

Technical Specifications of the StarTech.com 2-port PCI Express RS232 Serial Adapter Card - PCIe to Dual Serial DB9 RS-232 Controller - 16950 UART - Windows and Linux

General Information

General Information specifications
Manufacturer StarTech.com
Manufacturer Part Number PEX2S953
Manufacturer Website Address http://www.startech.com
Brand Name StarTech.com
Product Name 2-Port PCI Express RS232 Serial Adapter Card - 16950 UART
Packaged Quantity 1
Product Type Serial Adapter

Technical Information

Technical Information specifications
Host Interface PCI Express 1.1 x1
UART Type 16950
Platform Supported LinuxPC

Interfaces/Ports

Interfaces/Ports specifications
Number of Serial Ports (External) 2

Physical Characteristics

Physical Characteristics specifications
Form Factor Plug-in Card
Card Height Low-profile
Height 0.6"
Width 2.5"
Length 3"

Miscellaneous

Miscellaneous specifications
Package Contents
  • 2-Port PCI Express RS232 Serial Adapter Card - 16950 UART
  • 1 x Low Profile Bracket
  • 1 x Quick Start Guide
Green Compliant Yes
Green Compliance Certificate / Authority EU RoHS
Environmental Compliance Registration, Evaluation, Authorization and Restriction of Chemicals (REACH)Waste Electrical and Electronic Equipment Directive (WEEE)Restriction of Hazardous Substances (RoHS) 2
Country of Origin Taiwan
End of Life Manual Availability Yes
EU RoHS Declaration URL https://media.startech.com/cms/pdfs/pex2s953_rohs.pdf
REACH Declaration URL https://media.startech.com/cms/pdfs/pex2s953_rohs.pdf
REACH free of SVHC Yes
WEEE Statement https://media.startech.com/cms/pdfs/pex2s953_weee.pdf

Warranty

Warranty specifications
Limited Warranty Lifetime

Ratings and reviews

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