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StarTech 4-Port PCI Express PCIe Serial Combo Card, TAA (PEX4S232485) | 2 x RS232 2 x RS422 / RS485, With Breakout Cable, Dual Profile
StarTech.com

StarTech.com StarTech 4-Port PCI Express PCIe Serial Combo Card

Bottom line: The StarTech.com StarTech 4-Port PCI Express PCIe Serial Combo Card is a specs-and-price decision rather than a crowd-consensus one in the expansion cards category, priced around $136.99 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.

$136.99

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Buy on Amazon — $136.99 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.

Pros & Cons

Pros

  • ✓ 4 Port PCI Express PCIe Serial Combo Card
  • ✓ Backed by StarTech.com's warranty and support channels

Cons

  • ✗ 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

The PEX4S232485 4 Port PCI Express PCIe Serial Combo Card - 2 x RS232 2 x RS422 / RS485 lets you add two RS232, and two RS422/485 serial ports to your PC through a PCI-Express expansion slot. This PCI express serial card is a single card solution that is compatible with nearly any serial communication protocol, supporting RS-232, RS-422, RS-485 2-wire or RS-485 4-wire operating modes. A flexible solution for adding serial ports to full-sized, or small form factor systems, the 4-port serial card includes both low and full profile brackets while the included breakout cable helps to avoid…

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SpecPicks Verdict

SpecPicks scored StarTech.com StarTech 4-Port PCI Express PCIe Serial Combo Card using a rating × review-volume × price-fit model applied to published specs and reviews across the expansion cards category. StarTech.com's expansion cards lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. 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

  • Add two RS232 and two RS422/485 serial ports to your PC through a PCI-Express expansion slot
  • 4 Port PCI Express PCIe Serial Combo Card
  • 4 port (2 x RS232, 2 x RS422/485) serial combo card
  • PCI Express RS485 / PCIe RS485 / PCI Express RS422 / PCIe RS422 serial combo card
  • Dual Profile PCIe serial card adapter with breakout cable
  • This single PCI Express combo card is compatible with any serial device protocol (RS232, RS422, and RS485), allowing for communication with multiple devices over mixed protocols

Full Specifications

BrandStarTech.com
StyleClassic
Style NameClassic
Unit Count1 Count
Model NumberPEX4S232485
CompatibilityPC
Built-In MediaLow-profile bracket, Serial adapter
Item Type NameMultiport Serial Adapter
Mfr Part NumberPEX4S232485
Compatible DevicesPersonal Computer
Hardware InterfacePCI
Warranty DescriptionLifetime
Item Dimensions L x W x H5.3"L x 0.6"W x 2.7"H
Global Trade Identification Number00065030849357
Full listing titleStarTech 4-Port PCI Express PCIe Serial Combo Card, TAA (PEX4S232485) | 2 x RS232 2 x RS422 / RS485, With Breakout Cable, Dual Profile

Ready to buy?

StarTech 4-Port PCI Express PCIe Serial Combo Card, TAA (PEX4S232485) | 2 x RS232 2 x RS422 / RS485, With Breakout Cable, Dual Profile 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 — $136.99

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

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StarTech 4-Port PCI Express PCIe Serial Combo Card, TAA (PEX4S232485) | 2 x RS232 2 x RS422 / RS485, With Breakout Cable, Dual Profile
$136.99
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