# StarTech.com 2-port PCI Express RS232 Serial Adapter Card PCIe RS232 Serial Host Controller Card Dual Serial DB9 16950 UART

**URL:** https://aio.lv/en/product--startech-pex2s953--10974027
**Data updated:** 2025-12-30 15:00 (EET)
**Category:** I/O Adapters & Controllers
**Manufacturer:** StarTech
**Manufacturer code:** PEX2S953
**EAN:** 0065030888332
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 64.49 €
**Prices and availability valid until:** 2026-07-18 23:59
**Price without VAT (21%):** 53.30 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--startech-pex2s953--10974027

## 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.com 2-port PCI Express RS232 Serial Adapter Card provides dual DB9 serial ports for connecting serial devices. It features a 16950 UART chipset, supports baud rates up to 921.6 Kbit/s, and is compatible with Windows and Linux operating systems. Ideal for expanding serial connectivity in various applications.

## Long description

The StarTech.com 2-port PCI Express RS232 serial adapter (PEX2S953) adds two DB9 RS232 serial ports to a computer via a PCI Express slot, allowing connection to serial devices such as card readers, printers, PIN pads and modems. The adapter uses an ASIX AX99100 16950-compatible UART chipset and supports baud rates up to 921.6 Kbps. It includes both full- and low-profile brackets and provides 5/12V power on pin 9 when external power is connected.
Advantages
This PCIe RS232 serial host controller card is compatible with Windows and Linux, offers a high maximum baud rate (up to 921.6 Kbps), and includes 256-byte FIFO buffers for each transmitter and receiver to help ensure reliable data transfer. The card is compliant with PCI Express 1.1 and ships with both full- and low-profile brackets for flexible installation in different chassis.
Suitable for
Connecting legacy serial peripherals (card readers, POS printers, PIN pads)
Industrial equipment and automation systems requiring RS232 interfaces
Embedded systems, diagnostic tools and modems
Workstations or servers needing additional native-style serial ports
Key specifications
Model: PEX2S953 (StarTech.com)
Host interface: PCIe (PCI Express 1.1 compliant)
Ports: 2 x RS232 DB9
Chipset: ASIX AX99100, 16950 UART compatible
Maximum baud rate: up to 921.6 Kbps
FIFO: 256-byte depth per transmitter and receiver
Power output: 5/12V on pin 9 (requires external power)
OS compatibility: Windows and Linux
Colour: Green
Weight: 0.056 kg
How to use
Install the card into an available PCI Express slot in the computer and secure the bracket appropriate to the case form factor (full or low profile). If required by your serial devices, connect an external power source to enable 5/12V output on pin 9. Install or verify drivers for your operating system (Windows or Linux) so the ports are recognized as native serial interfaces, then connect DB9 serial cables to the device ports and configure baud rate and serial parameters according to the connected equipment.
Usage recommendations
Use quality shielded DB9 cables and verify grounding when connecting industrial equipment. For reliable high-speed communication, match the baud rate and serial settings (data bits, parity, stop bits) on both ends and ensure any required external power is connected before enabling devices that use pin 9 power.

## 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 |
| Sustainability 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.com 2-port PCI Express RS232 Serial Adapter Card cost, and is it available for purchase?

The price is 64.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 142 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. 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.com 2-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.

## Image

https://aio.lv/img/cache/product/10974027/61396689_large.webp