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header-product StarTech PEX2S953 2-Port PCI Express RS232 Serial Adapter Card with 16950 UART
68.49 €

StarTech PEX2S953 2-Port PCI Express RS232 Serial Adapter Card with 16950 UART

StarTech PEX2S953 2-Port PCIe RS232 Serial Adapter Card Photo 1
StarTech PEX2S953 2-Port PCIe RS232 Serial Adapter Card Photo 2
StarTech PEX2S953 2-Port PCIe RS232 Serial Adapter Card Photo 3
StarTech PEX2S953 2-Port PCIe RS232 Serial Adapter Card Photo 4
StarTech PEX2S953 2-Port PCIe RS232 Serial Adapter Card Photo 5
StarTech PEX2S953 2-Port PCIe RS232 Serial Adapter Card Photo 6
StarTech PEX2S953 2-Port PCIe RS232 Serial Adapter Card Photo 1
StarTech PEX2S953 2-Port PCIe RS232 Serial Adapter Card Photo 2
StarTech PEX2S953 2-Port PCIe RS232 Serial Adapter Card Photo 3
StarTech PEX2S953 2-Port PCIe RS232 Serial Adapter Card Photo 4
StarTech PEX2S953 2-Port PCIe RS232 Serial Adapter Card Photo 5
StarTech PEX2S953 2-Port PCIe RS232 Serial Adapter Card Photo 6
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StarTech PEX2S953 2-Port PCI Express RS232 Serial Adapter Card with 16950 UART

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Short description

The StarTech PEX2S953 is a 2-port PCI Express RS232 serial adapter card featuring the Asix AX99100 chipset and 16950 UART. It supports baud rates up to 921.6 Kbit/s and includes a 256-byte FIFO buffer for reliable data transmission. Designed for industrial and professional applications, this internal PCIe expansion card provides two DB9 serial ports, ensuring broad compatibility with Windows and Linux operating systems for legacy device connectivity.
Available for order: 81 pcs.
Warranty: 2 Years
SKU: 3455912
Manufacturer: StarTech
free shipment

Cheapest delivery:

Venipak Pickup LV, Venipak Locker LV

Pick-up points

Venipak Pickup LV

Venipak Locker LV

Cost

1.89 €

Deliver

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Customer service center
2b. Kengaraga str., Riga, Latvia, LV-1063
23.07.2026 {{selectedOffer.officeDeliveryString}}
free
Courier Delivery Please note that in case of a large parcel additional delivery costs may apply!
28.07.2026 {{selectedOffer.courierDeliveryString}}
From 4.99 € (Weight: 0.15 kg)
Parcel couriers
Venipak Pickup LV / Venipak Locker LV / Latvijas Pasts pakomāts / Unisend LV / DPD Paku skapis / Omniva LV / Latvijas Pasts nodaļa
28.07.2026 {{selectedOffer.parcelStationDeliveryString}}
From 1.89 €
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Payment Methods:
Bank transfer, Bank cards on-line, Apple Pay, Google Pay
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Product information

Description

The StarTech PEX2S953 is a high-performance 2-port PCI Express RS232 serial adapter card designed to provide reliable connectivity for legacy serial devices. Utilizing the Asix AX99100 chipset and advanced 16950 UART technology, this internal expansion card allows you to add two DB9 serial ports to your computer via a PCIe slot. It is engineered to handle demanding data transmission tasks with high efficiency, supporting baud rates up to 921.6 Kbit/s and featuring a 256-byte FIFO buffer to prevent data loss during high-speed operations.

Advantages

This adapter card offers exceptional compatibility and performance for professional and industrial environments. By providing native-like serial port functionality, it ensures seamless interaction with a wide range of peripheral equipment. The inclusion of both full-profile and low-profile brackets makes it highly versatile for installation in various computer case form factors. Furthermore, the ability to provide 5V or 12V power output on Pin 9 when connected to an external power source adds significant flexibility for powering specific serial devices directly through the interface.

Suitable for

  • Connecting legacy serial devices such as barcode scanners and card readers
  • Interfacing with industrial equipment like CNC machines and PLCs
  • Managing serial-based communication for printers and modems
  • Integration into POS systems requiring reliable serial connectivity

When it may not be suitable

This card is designed specifically for systems with available PCI Express slots and is not compatible with older PCI or legacy expansion slots. It is also not intended for use in devices that do not support standard Windows or Linux operating systems.

Key specifications

  • Host interface: PCI Express
  • Ports: 2 x RS232 DB9 serial ports
  • UART: 16950 compatible
  • Maximum baud rate: 921.6 Kbit/s
  • FIFO buffer: 256-byte depth per port
  • Chipset: Asix AX99100
  • Power output: 5V/12V on Pin 9 (with external power)
  • Form factor: Includes low and full-profile brackets

How to use

To install the card, power down your computer and disconnect the power supply. Open the computer case and insert the card into an available PCIe slot, securing it with the appropriate bracket for your chassis. Once installed, reconnect the power and boot your operating system. The system should automatically detect the hardware, though you may need to install the latest drivers from the manufacturer's website to ensure optimal performance and full feature access. Once configured, connect your serial devices to the DB9 ports on the back of the card.

What to consider before purchase

  • Verify that your computer has an available PCIe slot
  • Check if your serial devices require 5V or 12V power via Pin 9
  • Ensure your operating system is supported by the current driver set
  • Confirm the physical space inside your computer case for either low or full-profile installation

Usage recommendations

For the best performance and stability, ensure that the card is seated firmly in the PCIe slot and that all drivers are updated to the latest version provided by the manufacturer. If your serial devices require additional power, ensure a stable external power source is connected to the card to utilize the Pin 9 power output feature.

Specifications

Host interface:
PCIe
Weight:
0.056 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

Sustainability compliance:
Yes
Compliance certificates:
CE, RoHS

Ports & interfaces

Serial interface type:
RS-232
Serial ports quantity:
2
Host interface:
PCIe
Output interface:
Serial
Expansion card standard:
PCIe 1.1

Other features

Quantity:
1

Weight & dimensions

Weight:
0.056 kg
Package weight:
136 g
Height:
15 mm
Width:
63 mm
Depth:
75 mm

System requirements

Windows operating systems supported:
Windows 7, Windows 7 Home Basic x64, Windows 10 x64, Windows 10 Pro x64, Windows 10 Pro, Windows 10 IOT Core, Windows 10 Home x64, Windows 10 Home, Windows 10 Enterprise x64, Windows 10 Enterprise, Windows 10 Education x64, Windows 10 Education, 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 Ultimate x64, Windows 7 Professional x64, Windows 7 Starter, Windows 7 Starter x64, Windows 7 Ultimate, 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 10
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

Mean time between failures (MTBF):
222366 h
Chipset:
Asix AX99100

Logistics data

Master (outer) case height:
306 mm
Master (outer) case width:
685 mm
Master (outer) case length:
345 mm
Products per master (outer) case:
75 pc(s)
Harmonized System (HS) code:
84733020

Features

Baud rate:
921.6 Kbit/s
Data bits:
7, 5, 6, 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

Package depth:
142 mm
Package height:
30 mm
Package width:
170 mm
Quick installation guide:
Yes

Description

Machine translation. Load original

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Customer reviews

Customer questions

FAQ

How much does the StarTech PEX2S953 2-Port PCIe RS232 Serial Adapter Card cost, and is it available for purchase?

The price is 68.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 81 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 23.07.2026 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. 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, 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 StarTech PEX2S953 2-Port PCIe 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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