---
product_id: 1041642
title: "StarTech 2-Port PCI Express RS232 Serial Adapter Card, TAA (PEX2S553)"
brand: "startech.com"
price: "$222.90"
currency: USD
in_stock: true
reviews_count: 13
category: "Star Tech.Com"
url: https://www.desertcart.us/products/1041642-startech-2-port-pci-express-rs232-serial-adapter-card-taa
store_origin: US
region: United States of America
---

# 460.8Kbps RS232 speed Configurable 12V/5V power per port PCIe x1 interface, low CPU load StarTech 2-Port PCI Express RS232 Serial Adapter Card, TAA (PEX2S553)

**Brand:** startech.com
**Price:** $222.90
**Availability:** ✅ In Stock

## Summary

> ⚡ Upgrade your legacy gear with lightning-fast, versatile serial power!

## Quick Answers

- **What is this?** StarTech 2-Port PCI Express RS232 Serial Adapter Card, TAA (PEX2S553) by startech.com
- **How much does it cost?** $222.90 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/1041642-startech-2-port-pci-express-rs232-serial-adapter-card-taa)

## 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:** Customize power delivery on each port with selectable 12V, 5V, or no power options to fit your exact hardware needs.
- • **Optimized CPU Efficiency:** Native single-chip design reduces CPU load by up to 48%, freeing resources for your critical applications.
- • **Blazing Fast Serial Speeds:** Experience ultra-responsive data transfer up to 460.8Kbps per port, perfect for demanding legacy device connections.
- • **Flexible Installation Options:** Includes both standard and low-profile brackets for effortless integration into any desktop or server chassis.
- • **Seamless Multi-OS Compatibility:** Plug & play support across Windows, Linux, and Mac OS ensures your setup is future-proof and hassle-free.

## Overview

The StarTech PEX2S553 is a high-performance 2-port PCI Express RS232 serial adapter card designed for professionals needing reliable legacy device connectivity. Featuring speeds up to 460.8Kbps, configurable power options per port, and broad OS compatibility, it offers flexible installation with standard and low-profile brackets. Its native single-chip design minimizes CPU load by nearly half, making it an efficient and durable solution backed by a 2-year warranty and lifetime support.

## 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 | #62 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 |
| Number of Items | 1 |
| Number of Packs | 1 |
| 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 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 2-Port PCI Express RS232 Serial Adapter Card, TAA (PEX2S553) - Image 1](https://m.media-amazon.com/images/I/716AqFEihBL.jpg)
![StarTech 2-Port PCI Express RS232 Serial Adapter Card, TAA (PEX2S553) - Image 2](https://m.media-amazon.com/images/I/71xUIV1RxHL.jpg)
![StarTech 2-Port PCI Express RS232 Serial Adapter Card, TAA (PEX2S553) - Image 3](https://m.media-amazon.com/images/I/61DLJme40bL.jpg)
![StarTech 2-Port PCI Express RS232 Serial Adapter Card, TAA (PEX2S553) - Image 4](https://m.media-amazon.com/images/I/71JLOMPIM-L.jpg)
![StarTech 2-Port PCI Express RS232 Serial Adapter Card, TAA (PEX2S553) - 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 United States of America*
*Store origin: US*
*Last updated: 2026-08-20*