StarTech.com 1-port PCI Express RS232 Serial Adapter Card

Name: StarTech.com 1-port PCI Express RS232 PEX1S553LP
Brand: StarTech
SKU: 11253941
Price: 55.99 EUR
Availability: InStock

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StarTech.com 1-port PCI Express RS232 Serial Adapter Card PCIe RS232 Serial Host Controller Card 16550 UART

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Offer for legal entity, cashless payment. Why is an item available only for a legal entity?
This is due to long delivery times and limited product warranties.

Short description

The StarTech.com 1-port PCI Express RS232 Serial Adapter Card provides a reliable solution for adding serial communication capabilities to your system. It features a PCIe interface, supports baud rates up to 460.8 Kbit/s, and is compatible with various Windows and Mac operating systems. The low-profile design makes it suitable for compact cases, while the 16550 UART ensures efficient data handling.

Available for order: 1 pcs.

Warranty: 2 Years

SKU: 11253941

Manufacturer: StarTech

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Deliver the order:

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to the Customer Service Center at Kengaraga 2b, Riga

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2b. Kengaraga str., Riga, Latvia, LV-1063

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From 4.99 € (Weight: 0.14 kg)

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Latvijas Pasts pakomāts / Unisend LV / DPD Paku skapis / Omniva LV / Venipak Pickup LV / Venipak Locker LV / Latvijas Pasts nodaļa

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From 1.99 €

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Product information

Description

Add an RS-232 serial port to a standard or small form factor computer using an available PCI Express expansion slot. The PEX1S553LP converts a PCIe slot into one RS232 (DB9) serial connection and uses a native single-chip design to take advantage of PCI Express performance while reducing CPU load compared with conventional bridge-chip serial cards. The card ships with a low-profile/half-height bracket installed and includes an optional full-height bracket so it can be installed in virtually any desktop or small form factor case. It is compatible with a wide range of operating systems and replaces the previous PEX1S552LP model.

Advantages

The native single-chip design delivers improved efficiency and lower CPU utilization. The adapter supports standard RS232 signaling via a DB9 connector and a 16550 UART for reliable serial data handling. Its low-profile form factor plus included full-height bracket provide flexible installation options for different case types. The card is backed by a two-year warranty and lifetime technical support.

Suitable for

Adding a serial port to desktops and small form factor PCs
Connecting legacy RS-232 devices such as modems, industrial controllers, or barcode scanners
Use in environments that require a single DB9 serial interface for control or data logging

Key specifications

Interface: PCI Express (PCIe)
Serial standard: RS-232 via DB9 connector
UART: 16550 compatible
Maximum supported baud rate: up to 460.8 Kbit/s
Form factor: low-profile with optional full-height bracket
Colour: green PCB
Weight: approximately 0.044 kg

How to use

Power off the computer, open the case, and insert the card into an available PCI Express slot. Secure the bracket to the chassis using the provided screw. Choose and attach either the low‑profile or full‑height bracket before closing the case. After powering on, install the appropriate driver for your operating system if required; many modern OS versions include compatible drivers. Connect the RS‑232 device to the DB9 port to begin serial communication.

Usage recommendations

For reliable operation, ensure the host system has an available PCIe slot and that the installed driver matches your operating system. Use shielded serial cables for longer runs and verify baud rate and serial settings (parity, stop bits, flow control) to match the connected device.

Specifications

Host interface:: PCIe
Weight:: 0.044 kg
Product colour:: Green

All features

Serial interface type:: RS-232
Serial ports quantity:: 1
Master (outer) case height:: 315 mm
Master (outer) case width:: 365 mm
Baud rate:: 460.8 Kbit/s
Output interface:: Serial
FIFO (First In, First Out):: 128
Master (outer) case length:: 692 mm
Products per master (outer) case:: 75 pc(s)
Harmonized System (HS) code:: 84733020
Compliance certificates:: RoHS, CE

Ports & interfaces

Host interface:: PCIe
Internal:: Yes
Peripheral (Molex) power connectors (4-pin):: 1

Network

Chipset:: ASIX - MCS9922CV-AA

Performance

Windows operating systems supported:: Windows Vista Ultimate, Windows Vista Ultimate x64, Windows Vista Home Premium x64, Windows 8.1 Enterprise x64, Windows Vista Home Premium, Windows XP Home, Windows Vista Home Basic x64, Windows Vista Home Basic, Windows Vista Enterprise x64, Windows Vista Enterprise, Windows Vista Business x64, Windows Vista Business, Windows ME, Windows 98SE, Windows 95, Windows 8.1 x64, Windows 8.1 Pro x64, Windows 8.1 Pro, Windows 8 Pro x64, Windows XP Home x64, Windows XP Professional x64, Windows XP Professional, Windows 8.1, Windows 10 Education, Windows 10 Education x64, Windows 10 Enterprise, Windows 10 Enterprise x64, Windows 10 Home, Windows 10 Home x64, Windows 10 Pro, Windows 10 Pro x64, Windows 11, Windows 11 x64, Windows 2000, Windows 2000 Professional, Windows 7 Enterprise, Windows 7 Enterprise x64, Windows 7 Home Basic, Windows 7 Home Premium, Windows 7 Home Premium x64, Windows 7 Professional, Windows 7 Professional x64, Windows 7 Starter, Windows 7 Starter x64, Windows 7 Ultimate, Windows 7 Ultimate x64, Windows 8, Windows 8 Enterprise, Windows 8 Enterprise x64, Windows 8 Pro, Windows 8 x64, Windows 8.1 Enterprise, Windows 7 Home Basic x64
Mac operating systems supported:: Mac OS X 10.9 Mavericks, Mac OS X 10.8 Mountain Lion, Mac OS X 10.7 Lion, Mac OS X 10.6 Snow Leopard, Mac OS X 10.5 Leopard, Mac OS X 10.4 Tiger, Mac OS X 10.10 Yosemite
Linux operating systems supported:: Y
Server operating systems supported:: Windows Server 2019, Windows Server 2016, Windows Server 2012 R2, Windows Server 2012, Windows Server 2008 R2, Windows Server 2003
Other operating systems supported:: Windows XP Embedded, DOS

Design

Product colour:: Green

Weight & dimensions

Weight:: 0.044 kg
Package weight:: 130 g
Height:: 20 mm
Width:: 80 mm
Depth:: 105 mm
Package depth:: 174 mm
Package height:: 32 mm
Package width:: 143 mm

Operational conditions

Operating relative humidity (H-H):: 5 - 85
Storage temperature (T-T):: -20 - 100
Operating temperature (T-T):: -10 - 80

Packaging content

Manual:: Yes
Drivers included:: Yes

Other features

Compatible operating systems:: Linux, Mac OS 10.4.x

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Instructions

mmo_5930740_1655393271_8151_4670.pdf

startechcom-PEX1S553LP-11253941.pdf

Description

Instructions

mmo_5930740_1655393271_8151_4670.pdf

startechcom-PEX1S553LP-11253941.pdf

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Customer questions

FAQ

How much does the StarTech.com 1-port PCI Express RS232 Serial Adapter Card cost, and is it available for purchase?

The price is 55.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 1 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 01.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

What is the warranty period?

All StarTech products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized StarTech service centers and through AiO.lv

Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. We will assist with consultation, warranty claim processing, and coordination with certified service centers.

How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: host interface, weight, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

Where can I download the instructions for StarTech.com 1-port PCI Express RS232 Serial Adapter Card?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.

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