StarTech PEX4S953LP PCIe 4-port RS232 Serial Card

Name: PCIe 4-port RS232 Serial Adapter PEX4S953LP
Brand: StarTech
SKU: 3450437
Price: 159.99 EUR
Availability: InStock

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PCIe 4-port RS232 Serial Adapter Card StarTech PEX4S953LP — 16950 UART, 256B FIFO, Low Profile

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Short description

PCIe 4-port RS232 serial adapter card by StarTech (PEX4S953LP) provides four DB9 serial ports via a PCI Express host interface. Based on the Asix AX99100 chipset with 16950 UART and 256-byte FIFO, it supports baud rates up to 921.6 Kbit/s and PCIe 1.1 expansion standard. Low-profile form factor (75×63×18 mm), compatible with Windows and various Windows Server versions. CE/FCC certified, MTBF 214,358 h.

Available at price 159.99 €: 50 pcs.

Total available for order: 100 pcs.

Warranty: 2 Years

SKU: 3450437

Manufacturer: StarTech

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Product information

Description

The StarTech PEX4S953LP is a PCIe 4-port RS232 serial adapter card that adds four DB9 serial ports to a desktop or server via a PCI Express slot. It uses the Asix AX99100 chipset with an industry-standard 16950 UART and 256-byte FIFO buffers, and supports baud rates up to 921.6 Kbit/s. The card is PCI Express 1.1 compliant, supplied with low-profile and optional full-profile brackets for installation in different chassis, and is CE/FCC certified with an MTBF of 214,358 hours. Drivers are available for Windows and supported Windows Server versions; Linux compatibility is also indicated.

Advantages

The adapter provides four independent RS232 (DB9) ports on a single PCIe card, enabling high-speed serial communication up to 921.6 Kbit/s. Built on a 16950 UART with 256-byte FIFO per transmitter and receiver, it reduces CPU interrupts and improves data throughput for multiple simultaneous serial connections. The low-profile form factor and included full-profile bracket simplify installation in a range of systems. Compliance with PCIe 1.1 and CE/FCC certification ensure reliable interoperability and regulatory compliance.

Suitable for

Connecting legacy serial devices such as receipt printers, barcode scanners, and industrial controllers
Integrating point-of-sale terminals, PIN pads, and card readers that require RS232 interfaces
Managing serial communications for network equipment, modems, and laboratory instruments
Expanding serial port capacity in servers and workstations with limited onboard COM ports

Key specifications

Interface: PCI Express (PCIe) 1.1 host interface
Serial ports: 4 × RS232 DB9 connectors
Chipset: Asix AX99100
UART: Industry-standard 16950
FIFO: 256-byte FIFO per transmitter and receiver
Maximum baud rate: Up to 921.6 Kbit/s
Form factor: Low-profile card (includes full-profile bracket)
Power output: 5/12V on Pin 9 when external power is connected
Certifications: CE, FCC
MTBF: 214,358 hours

How to use

Power down the computer and insert the card into an available PCIe slot, choosing the low-profile or full-profile bracket as appropriate for your chassis. Secure the bracket, reconnect power, and boot the system. Install the appropriate drivers for your operating system (Windows, supported Windows Server versions, or Linux) following the vendor instructions. Connect serial devices to the DB9 ports and configure port settings (baud rate, data bits, parity, stop bits) in your OS or serial communication software to match the connected devices. If external power is required for pin 9 output, connect the external power source as specified by your device documentation.

Usage recommendations

Use shielded serial cables to minimize interference and verify baud rate and handshake settings for each connected device. For stable multi-device communication, enable the card's FIFO buffering and match serial parameters to the peripheral's requirements; consult device manuals for recommended power connections if using the 5/12V output on pin 9.

Specifications

Internal: The product is built in.: Yes
Host interface: Interface that enables a host controller to communicate with a driver.: PCIe
Output interface: The socket (port) where the output connectors are connected.: Serial

All features

Weight & dimensions

Package weight: Weight of the packaged product.: 370 g
Weight: Weight of the product without packaging (net weight). If possible, the net weight is given including standard accessories and supplies. Please note that sometimes the manufacturer leaves out the weight of accessories and/or supplies.: 0.264 kg
Height: The measurement of the product from head to foot or from base to top.: 18 mm
Depth: The distance from the front to the back of something.: 63 mm
Width: The measurement or extent of something from side to side.: 75 mm

Operational conditions

Operating relative humidity (H-H):: 5 - 85
Storage temperature (T-T): The minimum and maximum temperatures at which the product can be safely stored.: -20 - 100
Operating temperature (T-T): The minimum and maximum temperatures at which the product can be safely operated.: -10 - 80

System requirements

Server operating systems supported:: Windows Server 2012, Windows Server 2003, Windows Server 2008 R2, Windows Server 2012 R2, Windows Server 2016
Linux operating systems supported: 8 RT. Linux (9.4, 9.5), Red Hat Enterprise Linux 5.0 (supported with a pre-built package); SUSE Linux (10.3, 11.0, 11, 11.1, 11.2), Fedora (9, 9.0, 10, 10.0, 11.0, 11, 12, 12.0), Ubuntu (8.04, 8.04.1, 8.04.2, 8.10, 9.04, 9.10, 10.04), Debian (5.0, 5.0.1, 5.0.2, 5.0.3): Yes
Windows operating systems supported: Windows vesions wich can be used with the device.: Windows 7 Professional, Windows 7 Enterprise x64, Windows 7 Home Premium x64, Windows 7 Home Premium, Windows 7 Home Basic x64, Windows 7 Home Basic, Windows 10, Windows 10 Education, Windows 10 Education x64, Windows 10 Enterprise, Windows 10 Enterprise x64, Windows 10 Home, Windows 10 Home x64, Windows 10 IOT Core, Windows 10 Pro, Windows 10 Pro x64, Windows 10 x64, Windows 7, Windows 7 Enterprise, Windows 7 Starter, 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 Pro x64, Windows 8 Pro, Windows 8 Enterprise x64, Windows 8 Enterprise, Windows 8, Windows 7 x64, Windows 7 Ultimate x64, Windows 7 Ultimate, Windows 7 Starter x64, Windows 7 Professional x64

Other features

Quantity: The number of products there are.: 1

Logistics data

Harmonized System (HS) code:: 84733020
Products per master (outer) case:: 16 pc(s)
Master (outer) case height:: 235 mm
Master (outer) case length:: 350 mm
Master (outer) case width:: 480 mm

Packaging data

Package height: The distance from the top to the bottom of the packaging.: 51 mm
Package depth: The distance from the front to the back of the packaging.: 149 mm
Package width: The distance from one side of the packaging to the other.: 213 mm
Quick installation guide:: Yes
Mounting brackets included:: Yes
Cables included:: Serial

Technical details

Compliance certificates: Indicates which regulatory, safety, and environmental standards the product complies with, as verified by recognized authorities or certification bodies.: RoHS

Features

Flow Control type:: RTS/CTS, XON/XOFF, No
Parity bit:: Space, Odd, No, Mark, Even
Stop bits:: 2, 1, 1.5
Data bits:: 7, 9, 8, 5, 6
FIFO (First In, First Out):: 256
Baud rate:: 921.6 Kbit/s

Design

Product colour: The colour e.g. red, blue, green, black, white.: Green
Internal: The product is built in.: Yes

Ports & interfaces

Expansion card standard:: PCIe 1.1
Host interface: Interface that enables a host controller to communicate with a driver.: PCIe
Output interface: The socket (port) where the output connectors are connected.: Serial

Performance

Certification:: CE, FCC
Mean time between failures (MTBF): Statistical model used to indicate product/mechanism reliability; expressed in hours and percentage of duty cycle. This number (in hours) does not indicate the mean time before failure for a single unit/mechanism.: 214358 h
Chipset: Set of electronic components in an integrated circuit that manages the data flow between the processor, memory and peripherals. It is usually found in the motherboard of a computer. Chipsets are usually designed to work with a specific family of microprocessors. Because it controls communications between the processor and external devices, the chipset plays a crucial role in determining system performance.: Asix AX99100

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Instructions

mmo_77943592_1608026044_7332_1112.pdf

startech-PEX4S953LP-3450437.pdf

Description

Instructions

mmo_77943592_1608026044_7332_1112.pdf

startech-PEX4S953LP-3450437.pdf

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Warehouse	Stock	Delivery to the store	Store Price
WH357	50	12.08.2026 Best delivery	159.99 €
WH94	50	12.08.2026 Best delivery	163.49 €

159.99 €

Stock: 50

Delivery Date: 12.08.2026 Best delivery

Warehouse: WH357

163.49 €

Stock: 50

Delivery Date: 12.08.2026 Best delivery

Warehouse: WH94

Customer reviews

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Customer questions

FAQ

How much does the StarTech PEX4S953LP PCIe 4-port RS232 Serial Card cost, and is it available for purchase?

The price is 159.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 100 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 12.08.2026 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 StarTech PEX4S953LP PCIe 4-port RS232 Serial Card 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 StarTech PEX4S953LP PCIe 4-port RS232 Serial Card online, and the application process is as simple as possible:

Select the product on the website and add it to your cart;
When placing your order, choose the payment method “Installments”;
Fill in the required details for the lending partner;
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: internal, host interface, output interface, 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 PEX4S953LP PCIe 4-port RS232 Serial 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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PCIe 4-port RS232 Serial Adapter Card StarTech PEX4S953LP — 16950 UART, 256B FIFO, Low Profile

Short description

Product information

Description

Advantages

Suitable for

Key specifications

How to use

Usage recommendations

Specifications

Weight & dimensions

Operational conditions

System requirements

Other features

Logistics data

Packaging data

Technical details

Features

Design

Ports & interfaces

Performance

Instructions

Description

Instructions

Similar products

Product comparison

Customer reviews

Customer questions

How much does the StarTech PEX4S953LP PCIe 4-port RS232 Serial Card cost, and is it available for purchase?

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

What payment options are available?

Can StarTech PEX4S953LP PCIe 4-port RS232 Serial Card be purchased with a lease?

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

What is the warranty period?

Can the product be returned after purchase?

Where should I contact for warranty service?

How can I tell if this product suits my needs?

Where can I download the instructions for StarTech PEX4S953LP PCIe 4-port RS232 Serial Card?