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StarTech 2-Port PCI RS422/485 Serial Adapter Card, TAA (PCI2S4851050)
StarTech.com

StarTech 2-Port PCI RS422/485 Serial Adapter Card, TAA (PCI2S4851050)

Bottom line: The StarTech.com StarTech 2-Port PCI RS422/485 Serial Adapter Card is a specs-and-price decision rather than a crowd-consensus one in the expansion cards category. Check the specification table below against one or two close alternatives — on price and spec fit, not on star ratings.

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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.

Pros & Cons

Pros

  • ✓ Supports maximum data transmission rate of 128Kbps
  • ✓ 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 PCI2S4851050 2-Port PCI Serial Adapter Card (RS422/RS485) with 161050 UART adds two DB9 RS422/RS485 serial ports, using a single PCI expansion slot. The PCI serial card offers a high performance 16C1050 UART and supports both 2-wire and 4-wire RS485 modes. The card delivers an efficient single-chip design and a large 256-byte transit/receive FIFO buffer that work together to provide high-speed serial communication while reducing the overall load on the system CPU. With the included standard and low profile/half-height brackets, this PCI serial expansion card suits a broad range of system…

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SpecPicks Verdict

SpecPicks scored StarTech.com StarTech 2-Port PCI RS422/485 Serial Adapter 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

  • Supports maximum data transmission rate of 128Kbps
  • 16C1050 UART with 256-byte Deep FIFO
  • Supports 2-wire and 4-wire RS485 modes
  • Jumper pins for RS422/485 toggling
  • Supports Hardware and Software flow control

Full Specifications

BrandStarTech.com
StyleClassic
Style NameClassic
Unit Count1 Count
Model NumberPCI2S4851050
Mfr Part NumberPCI2S4851050
Number of Items1
Number of Packs1
Compatible DevicesPrinter
Hardware InterfacePCI
Warranty DescriptionLifetime warranty
Item Dimensions L x W x H4.7"L x 4.7"W x 1.8"H
Global Trade Identification Number00065030842587

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StarTech 2-Port PCI RS422/485 Serial Adapter Card, TAA (PCI2S4851050) 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.

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StarTech 2-Port PCI RS422/485 Serial Adapter Card, TAA (PCI2S4851050)
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