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Main image of PCI-E 1X to 2-Port RS232 DB9 Male Serial Expansion Card AX99100 Chip Supports RS232/RS485/RS422 with 12CM Bracket

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PCI-E 1X to 2-Port RS232 DB9 Male Serial Expansion Card AX99100 Chip Supports RS232/RS485/RS422 with 12CM Bracket

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PCI-E 1X interface expands 2 independent DB9 male serial COM ports; Built-in AX99100 master chip supports RS232, RS485 and RS422 communication modes; Equipped with 12CM full-height bracket, fits standard PC and industrial chassis; Industrial-grade anti-surge circuit ensures stable serial signal transmission; Wide OS compatibility for Windows, Linux, ideal for PLC, POS and testing devices

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This PCI-E 1X serial riser card adopts high-performance AX99100 control chip to add two standard DB9 male COM ports to desktop or industrial motherboards without native serial interfaces. It switches freely among RS232, RS485 and RS422 differential signal modes to meet diverse industrial communication demands. Matching a 12-centimeter standard metal bracket, the card can be stably installed in full-size tower and industrial control chassis. Built-in transient voltage protection circuit suppresses surge and electromagnetic interference, delivering reliable long-running performance in factory, lab and retail POS environments. Two separate serial channels work independently without signal crosstalk, convenient for simultaneous debugging of multiple PLCs, inverters, scanners and testing instruments.

Complete driver packages support all mainstream Windows and Linux operating systems, widely used in industrial automation, machine vision, cash register equipment and server maintenance scenarios.

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First Listed on Newegg	August 17, 2026

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Return for refund within: 30 days
Return for replacement within: 30 days
This item is covered by LUOYIMAN Return Policy

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Item#: 9SIC745M4P3048