Top view of StarTech.com PEX4S953LP PCIe serial adapter card showing circuit board and DB9 connector

High-Performance PCIe Serial Card with Advanced UART Technology

The PEX4S953LP features a robust PCIe interface and industry-standard 16950 UART architecture, delivering reliable serial connectivity for modern systems. The card's sophisticated design incorporates a 256-byte FIFO cache per port, ensuring smooth data transfer and minimal CPU overhead during intensive serial communications.

Technical Specifications

  • PCIe x1 interface for broad system compatibility
  • 16950 UART architecture for reliable data handling
  • 256-byte FIFO cache per port for efficient data transfer

Applications

  • Industrial automation control systems
  • Point-of-sale terminal connectivity
  • Legacy device integration in modern systems
Close-up view of DB9 serial port connector on PEX4S953LP card

Industrial-Grade DB9 Serial Port Interface

The card's DB9 connector provides a robust, industry-standard interface for serial communications. Built with durability in mind, the metal bracket and secure mounting ensure reliable connections in demanding environments. The RS232 port supports multiple data bit configurations for maximum device compatibility.

Technical Specifications

  • Standard DB9 RS232 serial interface
  • Multiple data bit configuration support
  • Secure mounting with metal bracket

Applications

  • Manufacturing equipment connectivity
  • Scientific instrument data collection
  • Serial device testing and development
Angled view of PEX4S953LP showing low-profile design and component layout

Compact Low-Profile Design with Advanced Circuitry

Engineered for space-efficient installation, this low-profile card features a carefully designed PCB layout with high-quality components. The Asix AX99100 chipset delivers superior performance while maintaining compatibility with a wide range of serial devices.

Technical Specifications

  • Low-profile form factor design
  • Asix AX99100 chipset implementation
  • Multi-layer PCB with optimized layout

Applications

  • Server room installations
  • Compact industrial PCs
  • Space-constrained system integration
Detailed view of PEX4S953LP power management components and circuitry

Enhanced Power Management Architecture

The card features sophisticated power management capabilities with selectable 5V/12V output options on Pin 9. This versatile power configuration supports a wide range of serial peripherals while maintaining efficient operation within PCIe power specifications.

Technical Specifications

  • Configurable 5V/12V power output
  • Advanced power management system
  • PCIe power specification compliance

Applications

  • Powered serial device integration
  • Industrial sensor networks
  • Automated control systems
Top-down detailed view of PEX4S953LP circuit board components

High-Density Component Integration

The card's sophisticated component layout maximizes functionality while maintaining signal integrity. Each element is carefully positioned to optimize performance and reliability, featuring high-quality surface-mount components and precise routing for maximum data throughput.

Technical Specifications

  • High-density PCB design
  • Precision component placement
  • Optimized signal routing

Applications

  • High-speed data acquisition
  • Mission-critical systems
  • Complex industrial automation
PEX4S953LP card with four-port DB9 breakout cable attached

Multi-Port Connectivity Solution

The included breakout cable expands the card's single connector into four individual DB9 serial ports, providing flexible connectivity options. Each port maintains full RS232 compatibility and independent operation, enabling simultaneous communication with multiple devices.

Technical Specifications

  • Four independent RS232 serial ports
  • Full breakout cable implementation
  • Individual port isolation

Applications

  • Multi-device monitoring systems
  • Parallel data collection
  • Multiple POS terminal management

Product details

General Information
Manufacturer

StarTech.com

Manufacturer Part Number

PEX4S953LP

Brand Name

StarTech.com

Product Name

4-Port PCI Express RS232 Serial Adapter Card - 16950 UART - Low Profile

Packaged Quantity

1

Product Type

Multiport Serial Adapter

Technical Information
Host Interface

PCI Express 1.1 x1

Maximum Data Transfer Rate

921.60 kbit/s

UART Type

16950

Platform Supported

PC
Linux

Interfaces/Ports
Ports Expandability

4 x DB-9 RS-232 - Serial, Via Cable

Physical Characteristics
Form Factor

Plug-in Card

Miscellaneous
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

Environmentally Friendly

Yes

Environmental Certification

RoHS
REACH
WEEE

Country of Origin

Taiwan

Warranty
Limited Warranty

Lifetime

Included in the Box

  • icon_list|serial adapter card|Serial Adapter Card Main unit icon

    Serial Adapter Card

  • icon_list|db9 breakout cable|DB9 Breakout Cable Connection cable icon

    DB9 Breakout Cable

  • icon_list|full profile bracket|Full Profile Bracket Spare bracket icon

    Full Profile Bracket

  • icon_list|quick-start guide|Quick-start Guide Documentation icon

    Quick-Start Guide

FAQs

What are the key features of the StarTech.com PEX4S953LP serial adapter card?
The StarTech.com PEX4S953LP is a 4-port PCI Express RS232 serial adapter card featuring industry-standard 16950 UART compatibility, 256-byte FIFO cache per transmitter and receiver, and supports data transfer speeds up to 921.6Kbps. It includes both low-profile and full-profile brackets, supports 5-9 data bits per port, and uses the Asix AX99100 chipset. The card is PCI Express 1.1 compliant and provides 5/12V power output on Pin 9 when external power is connected.
What operating systems is the PEX4S953LP compatible with?
The PEX4S953LP offers broad operating system compatibility, specifically supporting Windows and Linux platforms. This wide OS support makes it particularly suitable for integration into mixed computing environments, ensuring flexibility for various system configurations.
What is the maximum data transfer rate of the PEX4S953LP?
The PEX4S953LP supports a maximum data transfer rate of 921.6 Kbps (kilobits per second), making it suitable for high-speed serial communications with various devices such as card readers, printers, PIN pads, and modems.
What comes in the package with the PEX4S953LP?
The package includes the 4-Port PCI Express RS232 Serial Adapter Card, a 4-Port DB9 break-out cable, a full-profile bracket (in addition to the pre-installed low-profile bracket), and a Quick-Start Guide. This complete package ensures easy installation for both low-profile and full-profile computer cases.
What type of warranty does StarTech.com offer for the PEX4S953LP?
StarTech.com offers a lifetime warranty for the PEX4S953LP, along with free lifetime technical support. This comprehensive warranty coverage demonstrates StarTech.com's confidence in the product's quality and their commitment to customer satisfaction.

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