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header-product StarTech.com 4-port PCI Express RS232 Serial Adapter Card PCIe to Serial DB9 16950 UART
147.99 €
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AiO.lv Computer Components Desktops accessories I/O Adapters & Controllers StarTech

StarTech.com 4-port PCI Express RS232 Serial Adapter Card PCIe to Serial DB9 16950 UART

StarTech.com 4-port PCI Express RS232 Serial Adapter Card Photo 1
StarTech.com 4-port PCI Express RS232 Serial Adapter Card Photo 1
StarTech.com 4-port PCI Express RS232 Serial Adapter Card PCIe to Serial DB9 16950 UART
147.99 €
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StarTech.com 4-port PCI Express RS232 Serial Adapter Card PCIe to Serial DB9 16950 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 4-port PCI Express RS232 Serial Adapter Card features a PCIe interface, supports baud rates up to 921.6 Kbit/s, and is compatible with Windows and Linux operating systems. Ideal for adding multiple serial connections to your system.
Available at price 147.99 €: 3 pcs.
Total available for order: 6 pcs.
Warranty: 2 Years
SKU: 10974040
Manufacturer: StarTech
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free shipment

Cheapest delivery:

Unisend LV

Pick-up points

Unisend LV

Cost

1.79 €

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Customer service center
2b. Kengaraga str., Riga, Latvia, LV-1063
12.08.2026 {{selectedOffer.officeDeliveryString}}
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From 4.99 € (Weight: 0.37 kg)
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Product information

Description

The StarTech.com 4-port PCI Express RS232 Serial Adapter Card (PEX4S953) adds four DB9 serial ports to a computer via a PCI Express (PCIe) slot, providing native-like serial connectivity with support for baud rates up to 921.6 Kbps. The card is based on the ASIX AX99100 chipset, features a 16950-compatible UART and is compatible with Windows and Linux. It ships with a full-size bracket and an optional low-profile bracket for flexible installation in various system form factors.

Advantages

This PCIe to serial DB9 adapter offers four bi-directional RS232 ports with a 256-byte FIFO for each transmitter and receiver, enabling reliable high-speed serial communication. It supports configurable Pin 9 power (5 V/12 V/none) when external power is provided, and each port can be configured individually. The adapter is PCI Express 1.1 compliant and is supplied with both standard and low-profile brackets for easy installation in different chassis.

Suitable for

  • Connecting legacy serial devices such as card readers and POS peripherals
  • Attaching industrial equipment, PLCs and modems
  • Integrating PIN pads and serial printers in point-of-sale systems
  • Upgrading workstations or servers that require additional RS232 ports

Key specifications

  • Model: PEX4S953
  • Interface: PCI Express (PCIe) — PCIe 1.1 compliant
  • Serial ports: 4 x DB9 RS232
  • UART: 16950-compatible (ASIX AX99100 chipset)
  • Maximum baud rate: 921.6 Kbps per port
  • FIFO: 256-byte depth per transmitter and receiver
  • Pin 9 power output: configurable 5 V / 12 V / none (requires external power)
  • Brackets: full-size pre-installed and optional low-profile
  • OS compatibility: Windows and Linux
  • Product colour: green

How to use

Install the adapter into an available PCIe slot on the host computer and secure the appropriate bracket for your chassis. If external power is needed for Pin 9 power output, connect the required power source according to the system documentation. Install drivers for your operating system if needed (Windows and Linux supported) and connect serial devices to the DB9 ports using the included DB44-to-4x DB9 breakout cable or standard serial cables. Configure port settings (baud rate, data bits, parity, stop bits) in your OS or application to match the connected devices.

Usage recommendations

For reliable operation at high baud rates, use short, shielded serial cables and ensure a stable external power supply when using Pin 9 power. Verify driver compatibility with your specific OS version and test each port after installation to confirm proper communication settings.

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.
371 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.
0.05 kg
Height: The measurement of the product from head to foot or from base to top.
15 mm
Depth: The distance from the front to the back of something.
75 mm
Width: The measurement or extent of something from side to side.
63 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, Windows 7 Home Premium x64, Windows 7 Home Premium, Windows 7 Home Basic x64, Windows 7 Home Basic, Windows 7 Enterprise x64, 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 IoT Enterprise, Windows 10 Pro, Windows 10 Pro x64, Windows 10 x64, Windows 7, 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 x64, 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:
240 mm
Master (outer) case length:
480 mm
Master (outer) case width:
340 mm

Packaging data

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

Technical details

Sustainability certificates:
RoHS

Features

Flow Control type:
RTS/CTS, XON/XOFF, No
Parity bit:
Space, Odd, No, Mark, Even
Stop bits:
1, 2, 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

Serial interface type:
RS-232
Serial ports quantity: The number of serial ports in a computer or peripheral. A serial port is a serial communication physical interface through which information transfers in or out one bit at a time. The term "serial port" usually identifies hardware more or less compliant to the RS-232 standard, intended to interface with a modem or with a similar communication device. In modern computers and peripherals, serial ports have largely been replaced by USBs and other interfaces.
4
Expansion card form factor:
Full-height / Low-profile
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, Microsoft WHQL
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_78297400_1608026018_3996_1049.pdf
oem-PEX4S953-10974040.pdf

Description

Instructions

mmo_78297400_1608026018_3996_1049.pdf
oem-PEX4S953-10974040.pdf
Machine translation. Load original

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Stock data
Available only for legal entities
Warehouse Stock Delivery to the store Store Price
EU9 3 12.08.2026 Best delivery
147.99 € Best price
WH109 3 26.08.2026
156.99 €
Available only for legal entities
147.99 €
Stock: 3
Delivery Date: 12.08.2026 Best delivery
Warehouse: EU9
156.99 €
Stock: 3
Delivery Date: 26.08.2026
Warehouse: WH109

Customer reviews

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Customer questions

FAQ

How much does the StarTech.com 4-port PCI Express RS232 Serial Adapter Card cost, and is it available for purchase?

The price is 147.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 6 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. 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: 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.com 4-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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