---
product_id: 1041642
title: "StarTech.com 2-Port PCI Express RS232 Serial Adapter Card, PCIe to Dual Serial DB9, Windows/Linux, TAA - Replaced by PEX2S953"
brand: "startech.com"
price: "₱414"
currency: PHP
in_stock: false
reviews_count: 13
url: https://www.desertcart.ph/products/1041642-startech-com-2-port-pci-express-rs232-serial-adapter-card
store_origin: PH
region: Philippines
---

# 460.8Kbps RS232 speed Configurable 12V/5V power per port Dual DB9 ports via PCIe x1 slot StarTech.com 2-Port PCI Express RS232 Serial Adapter Card, PCIe to Dual Serial DB9, Windows/Linux, TAA - Replaced by PEX2S953

**Brand:** startech.com
**Price:** ₱414
**Availability:** ❌ Out of Stock

## Summary

> 🚀 Upgrade your legacy gear with lightning-fast dual serial ports!

## Quick Answers

- **What is this?** StarTech.com 2-Port PCI Express RS232 Serial Adapter Card, PCIe to Dual Serial DB9, Windows/Linux, TAA - Replaced by PEX2S953 by startech.com
- **How much does it cost?** ₱414 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.ph](https://www.desertcart.ph/products/1041642-startech-com-2-port-pci-express-rs232-serial-adapter-card)

## Best For

- startech.com enthusiasts

## Why This Product

- Trusted startech.com brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Power Your Way:** Individually configurable 12V, 5V, or no power on each port
- • **CPU-Friendly Design:** Native single-chip reduces CPU load by up to 48%
- • **Plug & Play Versatility:** Includes standard and low-profile brackets for any PC build
- • **Blazing Fast Serial Speeds:** Up to 460.8Kbps per port for seamless data flow
- • **Cross-Platform Compatibility:** Supports Windows, Linux, and Mac OS for universal use

## Overview

The StarTech.com 2-Port PCI Express RS232 Serial Adapter Card (PEX2S553) transforms a PCIe slot into two high-speed DB9 serial ports, delivering up to 460.8Kbps per port. Featuring configurable power options and versatile bracket sizes, it supports Windows, Linux, and Mac OS, while its native single-chip design reduces CPU load by nearly half. Ideal for professionals needing reliable serial connectivity in automation, medical, or legacy device environments.

## Description

The PEX2S553 PCI Express serial card lets you turn a PCI Express slot into 2 RS232 (DB9) serial ports. Based on a native single chip design (no bridge chip), this 2-port serial adapter card allows you to harness the full capability offered by PCI Express (PCIe), and reducing the load applied to the CPU by as much as 48% over conventional serial cards. The RS232 Serial Adapter Card (PEX2S553) is compatible with a broad range of operating systems including Windows and Linux Kernel 2.6.11 to 4.11.x, and MAC OS 10.4 and above. Plus, the serial card includes an optional half-height/low profile bracket that allows the card to be installed in any PCI Express slot, regardless of the size of the computer case. This product is a replacement for our PEX2S552 card. Backed by a StarTech.com 2-year warranty and free lifetime technical support.

Review: Works in a PCIe 1x slot - This card installed smoothly on my Windows 7 x64 system - as long as I used the PCIe 1x slot. Originally I tried to use a PCIe 16x slot further away from the hot video card (the 16x slot is supposed to be backward compatible with smaller PCIe 1x cards) but the drivers did not work in that case. The card did not make a tight seating in the 16x slot. But as long as you have an open 1x slot, this card should work fine. I've had good success with the StarTech serial cards and ran into problems with other brands in the past.
Review: It's a StarTech. It works great. - As I've bought many StarTech devices in the past, I know the brand name for a quality product. This one is no different. Works great, adding two "old" DB-9 serial ports to my computer, which came with none of course, to run some ham radio devices.

## Features

- NEW VERSION AVAILABLE: PEX2S953
- 2 PORT SERIAL CARD: Serial controller card w/16550 UART based on ASIX MCS9922CV-AA, allows 2x DB9 ports w/bi-directional RS232 speeds up to 460.8Kbps per port, available 256 byte FIFO buffer
- OPTIONAL CONFIGURABLE POWER: PCI Express RS232 Serial Adapter Card provides choice of 12v, 5v, or none through pin 9. Each of the 2 ports are individually configurable
- STANDARD PROFILE & LOW PROFILE BRACKET: PCIe multiport serial card comes w/ a standard bracket pre-installed & 2x low profile brackets incl for versatile install; supports Windows & Linux
- VERSATILE APPLICATIONS: For standard profile desktop/servers with uses in point of sale terminals, PLCs, control/automation in factories, scientific sensors, medical equipment, scanners, oscilloscope

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0041UJREA |
| Best Sellers Rank | #69 in Serial Port Cards |
| Brand | StarTech.com |
| Compatible Devices | Personal Computer |
| Customer Reviews | 4.4 out of 5 stars 146 Reviews |
| Global Trade Identification Number | 00065030841740 |
| Hardware Interface | D-Sub, PCI Express x1 |
| Item Dimensions L x W x H | 4.1"L x 4.7"W x 0.8"H |
| Item Weight | 2.08 ounces |
| Manufacturer | Startech.com |
| Mfr Part Number | PEX2S553 |
| Model Number | PEX2S553 |
| Operating System | Windows 8 Mac OS X Mavericks (10.9) Linux Windows Server 2012 Windows 7 Mac OS X Yosemite (10.10) Windows 10 Windows Server 2016 Windows Server 2019 |
| Product Dimensions | 4.1"L x 4.7"W x 0.8"H |
| Style | 2 Port |
| Style Name | 2 Port |
| UPC | 065030841740 |
| Unit Count | 1.0 Count |
| Warranty Description | 2 year warranty |

## Product Details

- **Brand:** StarTech.com
- **Hardware Interface:** D-Sub, PCI Express x1
- **Item Weight:** 0.06 Kilograms
- **Product Dimensions:** 4.1"L x 4.7"W x 0.8"H
- **Style:** 2 Port

## Images

![StarTech.com 2-Port PCI Express RS232 Serial Adapter Card, PCIe to Dual Serial DB9, Windows/Linux, TAA - Replaced by PEX2S953 - Image 1](https://m.media-amazon.com/images/I/716AqFEihBL.jpg)
![StarTech.com 2-Port PCI Express RS232 Serial Adapter Card, PCIe to Dual Serial DB9, Windows/Linux, TAA - Replaced by PEX2S953 - Image 2](https://m.media-amazon.com/images/I/71xUIV1RxHL.jpg)
![StarTech.com 2-Port PCI Express RS232 Serial Adapter Card, PCIe to Dual Serial DB9, Windows/Linux, TAA - Replaced by PEX2S953 - Image 3](https://m.media-amazon.com/images/I/61DLJme40bL.jpg)
![StarTech.com 2-Port PCI Express RS232 Serial Adapter Card, PCIe to Dual Serial DB9, Windows/Linux, TAA - Replaced by PEX2S953 - Image 4](https://m.media-amazon.com/images/I/71JLOMPIM-L.jpg)
![StarTech.com 2-Port PCI Express RS232 Serial Adapter Card, PCIe to Dual Serial DB9, Windows/Linux, TAA - Replaced by PEX2S953 - Image 5](https://m.media-amazon.com/images/I/7107YZV6FtL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works in a PCIe 1x slot
*by D***L on May 29, 2012*

This card installed smoothly on my Windows 7 x64 system - as long as I used the PCIe 1x slot. Originally I tried to use a PCIe 16x slot further away from the hot video card (the 16x slot is supposed to be backward compatible with smaller PCIe 1x cards) but the drivers did not work in that case. The card did not make a tight seating in the 16x slot. But as long as you have an open 1x slot, this card should work fine. I've had good success with the StarTech serial cards and ran into problems with other brands in the past.

### ⭐⭐⭐⭐⭐ It's a StarTech. It works great.
*by D***D on December 15, 2024*

As I've bought many StarTech devices in the past, I know the brand name for a quality product. This one is no different. Works great, adding two "old" DB-9 serial ports to my computer, which came with none of course, to run some ham radio devices.

### ⭐⭐⭐⭐ Works
*by S***R on May 29, 2023*

It works fine but, on my system, it would not be recognized by Windows (10) unless it was installed in the first PCI-E slot (the one closest to the GPU). Not sure if it is my system or the card so I took off one star. You also need to install the drivers after the card is shown in device manager. Comes with a mini-CD but the driver version was older than what you can get on their web site. Otherwise, pretty solid, so far.

## Frequently Bought Together

- StarTech.com 2-Port PCI Express RS232 Serial Adapter Card, PCIe to Dual Serial DB9, Windows/Linux, TAA - Replaced by PEX2S553
- StarTech.com 1-port PCI Express RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller Card - PCIe to Serial DB9 - 16550 UART - Low Profile Expansion Card - Windows & Linux , TAA (PEX1S553LP)
- StarTech.com PCI Serial Parallel Combo Card with Dual Serial RS232 Ports (DB9) & 1x Parallel LPT Port (DB25) - PCI Combo Adapter Card - PCI Expansion Card Controller - PCI to Printer Card (PCI2S1P2)

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*Product available on Desertcart Philippines*
*Store origin: PH*
*Last updated: 2026-06-02*