Startech

StarTech 4-port PCI Express RS232 Serial Adapter Card - PCIe to Serial DB9 RS-232 Controller Card - 16950 UART - Windows/Linux (pex4s953)

(No reviews yet) Write a Review
SKU:
18060405
MPN:
pex4s953
Availability:
Usually ships the same or next business day. In stock at our CA, IL, PA warehouses.
Shipping:
Calculated at Checkout
Stock Update:
02/19/2026 06:14:54 PM PST
  • Main
  • Top
  • Right
  • Rear
  • Front
  • Alternate-Image1
$118.56

Bulk discount rates

Below are the available bulk discount rates for each individual item when you purchase a certain amount

Buy 2 and pay only $111.47 each 111.47
Buy 3 - 4 and pay only $109.07 each 109.07
Buy 5 and pay only $107.15 each 107.15
Buy 6 or above and pay only $104.27 each 104.27
Stock Update:
02/19/2026 06:14:54 PM PST

Description



This item is brand-new, factory sealed.

This PCI Express RS232 serial adapter card lets you add four RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot, as if they were native serial ports. The 4 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 multiport PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with a full-sized bracket, and includes an optional low-profile bracket, so installation is easy regardless of the case form factor. This expansion card is a direct replacement for PEX4S952.

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
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.

PEX4S953 is backed by a StarTech.com lifetime warranty and free lifetime technical support.



Package Contents:
  • 4 Port Full Profile Serial Card
  • 1 x Low Profile Bracket
  • 1 x Break-out Cable
  • 1 x Quick Start Guide

Features

Package Contents:   
  • 4 Port Full Profile Serial Card
  • 1 x Low Profile Bracket
  • 1 x Break-out Cable
  • 1 x Quick Start Guide

 

Environmentally Friendly:   
Yes

 

Environmental Compliance:

Restriction of Hazardous Substances (RoHS)
Waste Electrical and Electronic Equipment Directive (WEEE)
Registration, Evaluation, Authorization and Restriction of Chemicals (REACH)

 

Country of Origin:   
Taiwan

 

Specs

Physical Characteristics
Form FactorPlug-in Card
Warranty
Limited WarrantyLifetime
Interfaces/Ports
Ports Expandability4 x DB-9 RS-232 - Serial, Via Cable
General Information
Brand NameStarTech.com
Manufacturer Website Addresshttp://www.startech.com
Marketing InformationThis PCI Express RS232 serial adapter card lets you add four RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot, as if they were native serial ports. The 4 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 multiport PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with a full-sized bracket, and includes an optional low-profile bracket, so installation is easy regardless of the case form factor. This expansion card is a direct replacement for PEX4S952.
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
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.
PEX4S953 is backed by a StarTech.com lifetime warranty and free lifetime technical support.
More from the Manufacturer
More from the Manufacturer
Product TypeMultiport Serial Adapter
Product Name4 Port Full Profile Serial Card
ManufacturerStarTech.com
Manufacturer Part NumberPEX4S953
Packaged Quantity1 Each
Technical Information
Host InterfacePCI Express 1.1
Maximum Data Transfer Rate921.60 kbit/s
UART Type16950
Platform Supported

View AllClose

Warranty Information

All Items are Brand New, Factory Sealed and come with a standard warranty. [Read our policies]
View AllClose

0 Reviews

View AllClose
Main
StarTech 4-port PCI Express RS232 Serial Adapter Card - PCIe to Serial DB9 RS-232 Controller Card - 16950 UART - Windows/Linux (pex4s953)
$118.56