Startech PEX2S953 Product Data Sheet

2-port PCI Express RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller Card - PCIe to
Dual Serial DB9 Card - 16950 UART - Expansion Card - Windows, macOS, Linux

Product ID: PEX2S953

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.

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.

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

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.

Hardware

Warranty

Lifetime

Ports

2

Interface

Serial

Bus Type

mini PCI Express

Card Type

Standard Profile (LP bracket incl.)

Port Style

Integrated on Card

Chipset ID

Asix AX99100

Certifications, Reports and Compatibility

Applications

• Connect to automated self-service kiosks or ATM machines

• Connect in retail POS applications

• Install in home or office workstations

• Connect serial printers and other legacy devices to modern computers

Features

• 2 PORT SERIAL CARD: Serial controller card w/16950 UART based on ASIX AX99100, allows 2x DB9 ports
w/bi-directional RS232 speeds up to 921.6Kbps per port, available 256 byte FIFO buffer & 9th data bit

• OPTIONAL CONFIGURABLE POWER: PCI Express RS232 Serial Adapter Card provides choice of 12v, 5v, or
none through pin 9 w/up to 2A total; Each of the 2 ports are individually configurable

• STANDARD PROFILE & LOW PROFILE BRACKET: PCIe multiport serial card comes w/ a standard bracket
pre-installed & 2x low profile brackets incl for versatile install; supports Windows XP and up & Linux

• VERSATILE APPLICATIONS: For standard profile desktop/servers with uses in point of sale terminals, PLCs,
control/automation in factories, scientific sensors, medical equipment, scanners, oscilloscope

• STARTECH.COM ADVANTAGE: IT professionals choice for over 30 years; PCI-e RS232 Serial expansion card is
backed for life by StarTech.com, incl. free 24/5 North America based multi-lingual tech support