StarTech.com 4-port PCI Express RS232 Serial Adapter Card - PCIe Serial DB9 Controller Card 16950 UART - Low Profile - Windows/Linux

$118.89
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215 availableas of 09/14/2026

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Compliance, certifications and origin

  • RoHS
  • REACH
  • WEEE
  • 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 4-port PCI Express RS232 Serial Adapter Card - PCIe Serial DB9 Controller Card 16950 UART - Low Profile - Windows/Linux

View user manual

This PCI Express RS232 serial adapter card lets you add four RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot. 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 PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with low-profile brackets and includes optional full-profile brackets, so installation is easy regardless of the case form factor. This card is a direct replacement for PEX4S952LP.

Experience Optimal Technology
  • This PCIe to serial adapter supports the following features:
  • Compatible with industry-standard 16950 UART
  • 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

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.

PEX4S03LP is backed by a StarTech.com lifetime warranty and free lifetime technical support.

More from the Manufacturer This PCI Express RS232 serial adapter card lets you add four RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot. 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 PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with low-profile brackets and includes optional full-profile brackets, so installation is easy regardless of the case form factor. This card is a direct replacement for PEX4S952LP. Experience Optimal Technology This PCIe to serial adapter supports the following features: Compatible with industry-standard 16950 UART 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 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. PEX4S03LP is backed by a StarTech.com lifetime warranty and free lifetime technical support. More from the Manufacturer

This PCI Express RS232 serial adapter card lets you add four RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot. 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 PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with low-profile brackets and includes optional full-profile brackets, so installation is easy regardless of the case form factor. This card is a direct replacement for PEX4S952LP.

Experience Optimal Technology
  • This PCIe to serial adapter supports the following features:
  • Compatible with industry-standard 16950 UART
  • 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

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.

PEX4S03LP 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 4-port PCI Express RS232 Serial Adapter Card - PCIe Serial DB9 Controller Card 16950 UART - Low Profile - Windows/Linux

General Information

General Information specifications
Manufacturer StarTech.com
Manufacturer Part Number PEX4S953LP
Manufacturer Website Address http://www.startech.com
Brand Name StarTech.com
Product Name 4-Port PCI Express RS232 Serial Adapter Card - 16950 UART - Low Profile
Packaged Quantity 1 Each
Product Type Multiport Serial Adapter

Technical Information

Technical Information specifications
Host Interface PCI Express 1.1 x1
Maximum Data Transfer Rate 921.60 kbit/s
UART Type 16950
Platform Supported LinuxPC

Interfaces/Ports

Interfaces/Ports specifications
Ports Expandability 4 x DB-9 RS-232 - Serial, Via Cable

Physical Characteristics

Physical Characteristics specifications
Form Factor Plug-in Card

Miscellaneous

Miscellaneous specifications
Package Contents
  • 4-Port PCI Express RS232 Serial Adapter Card - 16950 UART - Low Profile
  • 1 x 4-Port DB9 Break-out Cable
  • 1 x Full Profile Bracket
  • 1 x Quick-Start Guide
Green Compliant Yes
Country of Origin Taiwan
Environmental Compliance Restriction of Hazardous Substances (RoHS)Registration, Evaluation, Authorization and Restriction of Chemicals (REACH)Waste Electrical and Electronic Equipment Directive (WEEE)

Warranty

Warranty specifications
Limited Warranty Lifetime

Ratings and reviews

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StarTech.com 1m Black DB9 RS232 Serial Null Modem Cable F/F

MFG Part # SCNM9FF1MBKPart # 1-975155UPC # 065030859578

Serial for Modem - 3.28 ft - 1 Pack - 1 x DB-9 Female Serial - 1 x DB-9 Female Serial - Nickel Plated - Shielding - Black

IN STOCK

577 available

$8.19 $4.10 SAVE $4.09

StarTech.com 2m Black DB9 RS232 Serial Null Modem Cable F/F

MFG Part # SCNM9FF2MBKPart # 1-975162UPC # 065030859585

Serial for Modem - 6.56 ft - 1 Pack - 1 x DB-9 Female Serial - 1 x DB-9 Female Serial - Nickel Plated - Shielding - Black

IN STOCK

1,020 available

$9.21 $4.71 SAVE $4.50

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