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StarTech 2-Port PCI Express RS232 Serial Adapter Card, TAA (PEX2S953LP) | PCIe RS232 Serial Host Controller Card, PCIe to Serial DB9, 16950 UART, Windows & Linux, Low Profile Expansion Card

StarTech 2-Port PCI Express RS232 Serial Adapter Card

Bottom line: The StarTech 2-Port PCI Express RS232 Serial Adapter Card is a specs-and-price decision rather than a crowd-consensus one in the expansion cards category, priced around $45.99 on Amazon as of 2026-10-06. Check the specification table below against one or two close alternatives — on price and spec fit, not on star ratings.

$45.99

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Buy on Amazon — $45.99 Compare to similar expansion cards

By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For retro PC hardware and period-correct parts, synthesises manufacturer documentation, community compatibility lists and marketplace listings rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

Before you buy

  • Confirm socket / form-factor / power-rating compatibility against your build before ordering
  • Price, stock, shipping and returns are set by the retailer and may have changed since this page was last updated

Manufacturer description

maximum compatibility with broad OS support, including for Windows and Linux, this PCI Express card is easy to integrate into mixed environments. The card comes pre-configured with a low-profile bracket, and includes an optional full-profile bracket, so installation is easy regardless of the case form factor. experience optimal technology This PCIe to serial adapter is compatible with industry standard 16950 UART, supports a max baud rate of up-to 921.4Kbps and provides 5/12V power output on pin 9 When external power connected. It offers 128-byte depth FIFO per transmitter and receiver…

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SpecPicks Verdict

SpecPicks scored StarTech 2-Port PCI Express RS232 Serial Adapter Card using a rating × review-volume × price-fit model applied to published specs and reviews across the expansion cards category. Compare with similarly-priced alternatives in the expansion cards category before committing. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for expansion cards of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Key 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; Upgraded version of our popular card PEX2S952LP
  • 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/ low profile bracket preinstalled & a full profile bracket is incl for versatile install; supports Windows XP and up & Linux
  • VERSATILE APPLICATIONS: For standard/low profile desktop/servers w/ uses in point of sale terminals, PLCs, control/automation in factories, scientific sensors, medical equipment, scanner, oscilloscope

Full Specifications

BrandStarTech.com
StyleFull Profile with LP Bracket
Style NameFull Profile with LP Bracket
Unit Count1 Count
Model NumberPEX2S953LP
CompatibilityLinux
Item Type NameSerial Adapter
Mfr Part NumberPEX2S953LP
Compatible DevicesDesktop
Hardware InterfaceSerial Interface
Warranty DescriptionLifetime
Global Trade Identification Number00065030881166
Full listing titleStarTech 2-Port PCI Express RS232 Serial Adapter Card, TAA (PEX2S953LP) | PCIe RS232 Serial Host Controller Card, PCIe to Serial DB9, 16950 UART, Windows & Linux, Low Profile Expansion Card

Ready to buy?

StarTech 2-Port PCI Express RS232 Serial Adapter Card, TAA (PEX2S953LP) | PCIe RS232 Serial Host Controller Card, PCIe to Serial DB9, 16950 UART, Windows & Linux, Low Profile Expansion Card is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

Buy on Amazon — $45.99

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

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StarTech 2-Port PCI Express RS232 Serial Adapter Card, TAA (PEX2S953LP) | PCIe RS232 Serial Host Controller Card, PCIe to Serial DB9, 16950 UART, Windows & Linux, Low Profile Expansion Card
$45.99
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