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SIIG 1-Port RS-232 Serial PCIe Card, DB9, ASIX AX99100, JJ-E20611-S1
SIIG

SIIG 1-Port RS-232 Serial PCIe Card, DB9, ASIX AX99100, JJ-E20611-S1

Bottom line: The SIIG 1-Port RS-232 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.

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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

  • ✓ Backed by SIIG'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

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SpecPicks Verdict

SpecPicks scored SIIG 1-Port RS-232 Serial PCIe Card using a rating × review-volume × price-fit model applied to published specs and reviews across the expansion cards category. SIIG'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

  • PCIe CARD: Adds 1 9-pin RS-232 serial port to PCIe enabled desktop computers, supports data transfer rate up to 250Kbps, Compliant with PCI Express 2.0 Gen 1
  • SEAMLESS CONTROL: Single-lane (x1) PCI Express End-point Controller with PHY integrated; Full serial modem control with hardware and software flow control; Supports 5, 6, 7, 8 and 9-bit serial formats, and Even, Odd, None, Space and Mark parity; On chip 256-byte FIFO buffers in transmit and receive path for each serial port
  • RS-232: Works as either standard RS-232 port or with 5V or 12V power output for devices that require power (such as handheld scanners, table scanners, POS displays and many more). Configurable via jumpers
  • DUAL-PROFILE BRACKETS: Supports PCI Bus Power Management Interface Specification Revision 1.2; Dual profile design installs into both full-size and low-profile system chassis with the included mounting brackets; Installs into any PCI Express slot of any lane width
  • INDUSTRY SOLUTIONS: Perfect solution to connect with POS system, industrial testing and control device, security system, logistic management equipment, printers, scanners, etc

Full Specifications

BrandSIIG
StyleClassic
PCIe CARDAdds 1 9-pin RS-232 serial port to PCIe enabled desktop computers, supports data transfer rate up to 250Kbps, Compliant with PCI Express 2.0 Gen 1
Style NameClassic
Unit Count1 Count
Model NumberJJ-E20611-S1
Mfr Part NumberJJ-E20611-S1
Number of Items1
Compatible DevicesPOS systems, industrial testing and control devices, security systems, logistic management equipment, printers, scanners
Hardware InterfacePCI Express x1
Warranty Description2 Year Limited

Ready to buy?

SIIG 1-Port RS-232 Serial PCIe Card, DB9, ASIX AX99100, JJ-E20611-S1 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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SIIG 1-Port RS-232 Serial PCIe Card, DB9, ASIX AX99100, JJ-E20611-S1
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