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

**URL:** https://aio.lv/en/product--startech-pex2s953--3455912
**Data updated:** 2026-06-17 16:32 (EEST)
**Category:** I/O Adapters & Controllers
**Manufacturer:** StarTech
**Manufacturer code:** PEX2S953
**EAN:** 0065030888332
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 59.99 €
**Prices and availability valid until:** 2026-07-18 23:59
**Price without VAT (21%):** 49.58 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--startech-pex2s953--3455912

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 06.07.2026 | free |
| Pickup points | 09.07.2026 | 1.99 EUR |
| Courier delivery to door | 09.07.2026 | 4.99 EUR |

## Summary 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.

## Long description

PCI Express to Serial Adapter \| 921.6Kbps \| Windows® and Linux® Compatible

This multiport PCI Express RS232 serial adapter card lets you add two RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot, as if they were native serial ports. The dual port PCIe serial card enables you to interact with serial devices, such as card readers, printers, PIN pads, and modems, at speeds of up to 921.6Kbps.

Maximum Compatibility

With broad OS support, including for Windows and Linux, this 2 port PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with a full-profile bracket, and includes optional low-profile brackets, so installation is easy regardless of the case form factor. This card is a direct replacement for PEX2S952 .

Experience Optimal Technology

This PCIe to serial adapter supports the following features:

• Industry standard 16950 UART compatible
• Supports max baud rate of up-to 921.6Kbps
• Provides 5/12V power output on Pin 9 when external power is connected
• 256-byte depth FIFO cache per transmitter and receiver
• Supports 9, 8, 7, 6, 5 data bits (one per port)
• Asix AX99100 chipset
• Base PCI Express 1.1 compliant
• Low and full-profile brackets included

The Choice of IT Pros Since 1985

StarTech.com conducts thorough compatibility and performance testing on all our products to ensure we are meeting or exceeding industry standards and providing high-quality products to IT Professionals. Our local StarTech.com Technical Advisors have broad product expertise and work directly with our StarTech.com Engineers to provide support for our customers both pre and post-sales.

PEX2S953 is backed by a StarTech.com lifetime warranty and free lifetime technical support.

The StarTech.com Advantage

## Specifications

### Operational conditions

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

### Technical details

| Feature | Value |
|---|---|
| Sustainability compliance | Yes |
| Compliance certificates | CE, RoHS |

### Ports & interfaces

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

### Other features

| Feature | Value |
|---|---|
| Quantity | 1 |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.056 kg |
| Package weight | 136 g |
| Height | 15 mm |
| Width | 63 mm |
| Depth | 75 mm |

### System requirements

| Feature | Value |
|---|---|
| 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

| Feature | Value |
|---|---|
| Internal | Yes |
| Product colour | Green |

### Performance

| Feature | Value |
|---|---|
| Mean time between failures (MTBF) | 222366 h |
| Chipset | Asix AX99100 |

### Logistics data

| Feature | Value |
|---|---|
| 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

| Feature | Value |
|---|---|
| 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

| Feature | Value |
|---|---|
| Package depth | 142 mm |
| Package height | 30 mm |
| Package width | 170 mm |
| Quick installation guide | Yes |

## FAQ

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

The price is 59.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 82 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 06.07.2026 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. More information about warranty service: https://aio.lv/en/warranty

### 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.

## Image

https://aio.lv/img/cache/product/3455912/65749369_large.webp