Skip to main content
StarTech 4-Port Serial PCIe Card, 16C1050 UART, TAA (PS74ADF-SERIAL-CARD)
StarTech.com

StarTech 4-Port Serial PCIe Card, 16C1050 UART, TAA (PS74ADF-SERIAL-CARD)

Bottom line: The StarTech.com StarTech 4-Port Serial PCIe 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.

Check price on Amazon

As an Amazon Associate, SpecPicks earns from qualifying purchases. Full disclosure →

Check price on Amazon → 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.

Pros & Cons

Pros

  • ✓ 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

Add serial communication support to a desktop computer or Small Form Factor (SFF) system, using this 4-Port Serial PCI Express Card. The four DB9 ports can be independently configured to support RS-232, RS-422, and 2/4-wire RS-485 Recommended Standards, for communication with compliant serial peripheral devices. This PCIe Serial Card is equipped with on-board DIP switches, enabling each DB9 serial port to operate in RS-232, RS-422, and/or RS-485 mode(s). The card features LED indicators per port, providing real-time monitoring of port activity. The PCI Express Serial Adapter Card features…

Related Products

Other products in this category you may like:

SpecPicks Verdict

SpecPicks scored StarTech.com StarTech 4-Port Serial PCIe 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

  • 4-PORT PCIE SERIAL CARD: On-board DIP switches allow each DB9 serial port to operate in its own independent mode, enabling the connection of RS-232, RS-422, and RS-485 devices; LED indicators to monitor data transmit/receive status
  • CONFIGURABLE POWER: Quad-Port PCI Express Serial Adapter Card features configurable power of 12V (1.5A per port), 5V (1.5A per port), or no power (RI) over pin 9 via auxiliary SATA power; Per-Port power modes are individually configurable via jumpers
  • APPLICATIONS: Ideal for desktops and servers, with a wide range of uses such as point-of-sale terminals, PLCs, factory control and automation, scientific sensors, medical equipment, scanners, and oscilloscopes; DB9 ports work with screw-locking cables
  • STANDARD & LOW PROFILE BRACKETS: TAA-Compliant Serial Card is equipped with two standard profile brackets (pre-installed), and includes four low-profile brackets for compatibility with small form factor desktops/servers
  • TECH SPECS: Asix AX99100 Chipset; 16C450 and 16C550 UART compatible; 4x 9-Pin D-Sub Ports; Max Baud 921.6Kbps per port; 256 Byte FIFO; COM Retention; Supports Windows and Linux; Odd/Even/Mark/Space/None Parity Modes; 5/6/7/8/9 Data Bits; PCIe 2.0 x1

Full Specifications

BrandStarTech.com
Style4-Port
Style Name4-Port
Unit Count4 Count
Model NumberPS74ADF-SERIAL-CARD
CompatibilityLinux
Mfr Part NumberPS74ADF-SERIAL-CARD
Number of Items1
Compatible DevicesPersonal Computer
Hardware InterfacePCI Express x1
Warranty Description2-Year
Item Dimensions L x W x H4.8"L x 4.3"W x 0.6"H

Ready to buy?

StarTech 4-Port Serial PCIe Card, 16C1050 UART, TAA (PS74ADF-SERIAL-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.

Check price on Amazon →

Related Expansion Cards

Keep exploring SpecPicks

Other buying guides

Browse the catalog

Editorial

More guides & deep dives from the SpecPicks archive

Browse all articles & guides →

More reviews from the SpecPicks archive

Browse all reviews →

Earliest SpecPicks reviews

Browse full archive →
StarTech 4-Port Serial PCIe Card, 16C1050 UART, TAA (PS74ADF-SERIAL-CARD)
View on Amazon →