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Single Port PCI Express x1 RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller to Single Serial DB9 Port
Syba

Syba Single Port PCI Express x1 RS232 Serial Adapter Card

Bottom line: The Syba Single Port PCI Express x1 RS232 Serial Adapter Card is a specs-and-price decision rather than a crowd-consensus one in the expansion cards category, priced around $17.83 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.

$17.83

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Buy on Amazon — $17.83 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

  • ✓ MCS9922 Chipset
  • ✓ Backed by Syba'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

MCS9922 is a single lane multifunction PCI express to I/O controller. It supports two serial ports and eight GPIO's. MCS9922 also provides an option for peripheral expansion through proprietary Cascade interface. The generic cascade interface allows interconnecting with similar chips like MCS9900 to expand the peripheral ports.The serial ports are compatible with RS232, RS422 & RS485 standards and supports throughput from 50bps to 16Mbps. All the GPIO pins are programmable and can be used as Input or Output. An I C interface is provided to configure MCS9922 device options through an external…

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SpecPicks Verdict

SpecPicks scored Syba Single Port PCI Express x1 RS232 Serial Adapter Card using a rating × review-volume × price-fit model applied to published specs and reviews across the expansion cards category. Syba'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

  • MCS9922 Chipset
  • Compatible with Industrial Standard 16C550 UART. On Chip 256-byte Depth FIFO in Transmit.
  • Transfer data rates up to 250Kbps on each port. Supports hardware and software flow control. Supports 5, 6, 7, 8-bit Serial format
  • Fully compliant with PCI-Express base Specification Revision 1. 0a
  • Single-lane (x1) PCI-Express with throughput up to 2. 5Gbps
  • Form Factor: Low profile

Full Specifications

BrandSyba
Style1 Port DB9 Serial PCI-e 1.0 x1 Card
Style Name1 Port DB9 Serial PCI-e 1.0 x1 Card
Unit Count1 Count
Form FactorLow profile
Model NumberSD-PEX15021
Built-In Media(1) 1-port Serial PCI-Express Card Low Profile Bracket^(1) Driver CD^(1) User's Manual
Item Type NameSyba Single Port RS-232 DB9 Serial PCI-e 2.0 x1 Expansion Card MCS9922 SD-PEX15021
Mfr Part NumberSD-PEX15021
Compatible DevicesPersonal Computer
Hardware InterfacePCI Express x1
Warranty Description3 Year Warranty
Global Trade Identification Number00172302676488
Full listing titleSingle Port PCI Express x1 RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller to Single Serial DB9 Port

Ready to buy?

Single Port PCI Express x1 RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller to Single Serial DB9 Port 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 — $17.83

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

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Single Port PCI Express x1 RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller to Single Serial DB9 Port
$17.83
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