PCIe 4-port RS232 Serial Card StarTech PEX4S953

Name: PCIe RS232 Serial Adapter Card PEX4S953
Brand: StarTech
SKU: 3455913
Price: 148.49 EUR
Availability: InStock

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PCIe RS232 Serial Adapter Card 4-port, StarTech PEX4S953, 16950 UART, AX99100, Full/Low-profile

PCIe 4-port RS232 Serial Card StarTech PEX4S953 Photo 1

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Short description

StarTech PEX4S953 is a 4-port PCI Express RS232 serial adapter card with 16950 UART and Asix AX99100 chipset. It provides four DB9 serial ports via a PCIe host interface, supports up to 921.6 Kbit/s baud rate and 256 B FIFO, and fits full-height and low-profile slots. Certified CE/FCC/WHQL, MTBF 214,358 h. Suitable for industrial devices, legacy equipment, POS and serial peripherals on Windows and Linux.

Available for order: 7 pcs.

Warranty: 2 Years

SKU: 3455913

Manufacturer: StarTech

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From 4.99 € (Weight: 0.39 kg)

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Product information

Description

The StarTech PEX4S953 is a 4-port PCIe RS232 serial adapter card that adds four DB9 serial ports to a computer via a PCI Express slot. Based on the Asix AX99100 chipset with 16950-compatible UART functionality, the card supports data rates up to 921.6 Kbit/s and 256-byte FIFO buffers per transmitter and receiver. It ships with a full-height bracket and an optional low-profile bracket for installation in a wide range of system enclosures and is certified to CE, FCC and WHQL standards.

Advantages

This PCIe to serial adapter provides four independent RS232 ports with 16950 UART compatibility, enabling reliable communication with legacy and industrial serial devices. With support for high baud rates up to 921.6 Kbit/s and 256 B FIFO, the card reduces CPU overhead for bursty serial traffic. The inclusion of both full-height and low-profile brackets simplifies fitting the card into standard and small form-factor systems, while broad OS compatibility and industry certifications help ensure predictable integration in professional environments.

Suitable for

Connecting legacy serial peripherals such as barcode scanners, modems and POS devices
Industrial equipment and automation controllers that require RS232 interfaces
Point-of-sale (POS) systems and payment terminals that use DB9 serial connections
Laboratory and test setups requiring multiple serial ports on a single host

Key specifications

Interface: PCI Express (PCIe) host connection
Serial ports: 4 × RS232 (DB9) ports
UART compatibility: 16950-compatible UART
Maximum baud rate: up to 921.6 Kbit/s
FIFO: 256-byte depth per transmitter and receiver
Power output: 5/12 V available on Pin 9 when external power is connected
Form factor support: full-height and low-profile brackets included
Chipset: Asix AX99100
Compliance: CE, FCC, WHQL
Reliability indicator: Mean time between failures (MTBF) reported

How to use

Install the PEX4S953 into an available PCIe slot on the host system, selecting and attaching the appropriate bracket for the case (full-height or low-profile). If required by your serial devices, connect an external power source to enable 5/12 V output on Pin 9 of the DB9 ports. Install the appropriate drivers for your operating system (Windows or Linux) and verify each COM port is recognized in the OS device manager or serial port listing. Configure serial parameters such as baud rate, data bits, parity and stop bits to match the connected equipment before initiating communication.

Usage recommendations

Match the card’s serial port settings to the attached devices (baud rate up to 921.6 Kbit/s, data bits and parity) and, when using power on Pin 9, confirm the connected peripherals accept the provided voltage. Use manufacturer drivers for your OS to ensure stable operation and consult system logs or device manager entries to troubleshoot port recognition or conflicts.

Specifications

Host interface:: PCIe
Weight:: 0.05 kg
Internal:: Yes
Output interface:: Serial
Product colour:: Green

All features

Operational conditions

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

Technical details

Compliance certificates:: RoHS

Ports & interfaces

Serial interface type:: RS-232
Serial ports quantity:: 4
Host interface:: PCIe
Output interface:: Serial
Expansion card form factor:: Full-height / Low-profile

Other features

Quantity:: 1

Weight & dimensions

Weight:: 0.05 kg
Package weight:: 371 g
Height:: 15 mm
Width:: 63 mm
Depth:: 75 mm

System requirements

Windows operating systems supported:: Windows 10 Home, Windows 10 Pro x64, Windows 10 Pro, Windows 10 IoT Enterprise, Windows 10 IOT Core, Windows 10 Home x64, Windows 7 Enterprise x64, Windows 10 Enterprise x64, Windows 10 Enterprise, Windows 10 Education x64, Windows 10 Education, Windows 10, Windows 10 x64, Windows 7, Windows 7 Enterprise, Windows 7 Home Basic, Windows 7 Home Basic x64, Windows 7 Ultimate, 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 x64, Windows 8.1 x64, Windows 8.1 Pro x64, Windows 8.1 Pro, Windows 8.1 Enterprise x64, Windows 8.1 Enterprise, Windows 8.1, Windows 8 x64, Windows 8 Pro x64, Windows 8 Pro, Windows 8 Enterprise x64, Windows 8 Enterprise, Windows 8, Windows 7 Ultimate x64
Linux operating systems supported:: Y
Server operating systems supported:: Windows Server 2016, Windows Server 2012 R2, Windows Server 2012, Windows Server 2008 R2, Windows Server 2003

Design

Internal:: Yes
Product colour:: Green

Performance

Certification:: CE, FCC, Microsoft WHQL
Mean time between failures (MTBF):: 214358 h
Chipset:: Asix AX99100

Logistics data

Master (outer) case height:: 240 mm
Master (outer) case width:: 340 mm
Master (outer) case length:: 480 mm
Products per master (outer) case:: 16 pc(s)
Harmonized System (HS) code:: 84733020

Features

Baud rate:: 921.6 Kbit/s
Data bits:: 6, 5, 7, 8, 9
Stop bits:: 1, 1.5, 2
Parity bit:: Even, Mark, N, Odd, Space
Flow Control type:: XON/XOFF, N, RTS/CTS
FIFO (First In, First Out):: 256

Packaging data

Cables included:: Serial
Package depth:: 210 mm
Package height:: 50 mm
Package width:: 150 mm
Quick installation guide:: Yes
Mounting brackets included:: Yes

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Instructions

mmo_78297400_1608026018_3996_1049.pdf

startech-PEX4S953-3455913.pdf

Description

Instructions

mmo_78297400_1608026018_3996_1049.pdf

startech-PEX4S953-3455913.pdf

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Customer questions

FAQ

How much does the PCIe 4-port RS232 Serial Card StarTech PEX4S953 cost, and is it available for purchase?

The price is 148.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 7 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 10.07.2026 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, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

Can PCIe 4-port RS232 Serial Card StarTech PEX4S953 be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. We work with leading banks and leasing companies in Latvia, allowing you to make your purchase on convenient terms — with a minimal down payment and a repayment period from 3 to 36 months. You can apply for credit or installments for the PCIe 4-port RS232 Serial Card StarTech PEX4S953 online, and the application process is as simple as possible:

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Receive a decision within a few minutes.

For more information about available payment options, interest-free installment terms, and credit conditions in Latvia, please visit the Payment page.

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, internal, output interface, 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 PCIe 4-port RS232 Serial Card StarTech PEX4S953?

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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