# 2-port PCI Express RS232 Serial Adapter Card StarTech PEX2S953LP

**URL:** https://aio.lv/en/product--startech-pex2s953lp--2116299
**Data updated:** 2025-12-29 10:38 (EET)
**Category:** I/O Adapters & Controllers
**Manufacturer:** StarTech
**Manufacturer code:** PEX2S953LP
**EAN:** 0065030881166
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 64.49 €
**Prices and availability valid until:** 2026-07-05 23:59
**Price without VAT (21%):** 53.30 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--startech-pex2s953lp--2116299

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 22.06.2026 | free |
| Pickup points | 29.06.2026 | 1.99 EUR |
| Courier delivery to door | 29.06.2026 | 4.99 EUR |

## Summary description

The StarTech 2-port PCI Express RS232 Serial Adapter Card (PEX2S953LP) offers reliable serial communication with a 16950 UART chipset, supporting baud rates up to 921.6 Kbit/s. It features a low profile design, making it ideal for compact systems. Compatible with Windows and Linux operating systems, this card is perfect for connecting serial devices in various environments. With a mean time between failures (MTBF) of 222366 hours, it ensures long-lasting performance.

## Long description

The StarTech 2-port PCI Express RS232 Serial Adapter Card (PEX2S953LP) adds two DB9 RS232 serial ports to a computer via a PCI Express slot. It uses an Asix AX99100 chipset with industry-standard 16950 UART support and provides serial communication at baud rates up to 921.4 Kbps. The card ships with a low-profile bracket and an optional full-profile bracket, and is compatible with Windows and Linux operating systems.
Advantages
This PCIe to serial adapter offers broad OS compatibility for mixed environments, support for high baud rates up to 921.4 Kbps, and a 256-byte FIFO for both transmit and receive to improve data handling. The card supplies 5/12V power on Pin 9 when external power is connected and complies with PCI Express 1.1 standards. Its low-profile form factor and included full-profile bracket simplify installation in different system cases.
Suitable for
Connecting card readers and payment terminals
Integrating serial printers and receipt printers
Attaching POS devices such as PIN pads
Connecting external modems and legacy serial instruments
Key specifications
Model: PEX2S953LP
Interface: PCI Express (PCIe 1.1 compliant)
Ports: 2 x DB9 RS232
Chipset: Asix AX99100
UART: Industry standard 16950
Maximum baud rate: up to 921.4 Kbps
FIFO depth: 256 bytes per transmitter and receiver
Power output: 5/12V on Pin 9 (requires external power)
Compatibility: Windows and Linux
Form factor: Low-profile with optional full-profile bracket
Internal card: Yes
Weight: 0.0556 kg
How to use
Power down the computer and insert the PEX2S953LP into an available PCI Express slot. Choose and install the appropriate bracket (low-profile or full-profile) to match the computer case. If required by your serial devices, connect external power so the card can supply 5/12V on Pin 9. Boot the system and install the manufacturer drivers or use built-in OS drivers for Windows or Linux. After drivers are installed, the two RS232 COM ports will be available to configure in your operating system and applications.
Usage recommendations
Use the included low-profile bracket for small form-factor systems and swap to the full-profile bracket for standard towers. For reliable power to connected peripherals that require Pin 9 voltage, ensure the external power connector is attached. Test communication at lower baud rates first, then increase toward the maximum 921.4 Kbps if cable length and device capabilities allow.

## 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 |
|---|---|
| Compliance certificates | RoHS |

### Ports & interfaces

| Feature | Value |
|---|---|
| Serial interface type | RS-232 |
| Serial ports quantity | 2 |
| Host interface | Mini PCI Express |
| Peripheral (Molex) power connectors (4-pin) | 1 |
| Output interface | Serial |
| Expansion card standard | PCIe 1.1 |

### Other features

| Feature | Value |
|---|---|
| Quantity | 1 |
| Manual | Yes |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.0556 kg |
| Package weight | 146.4 g |
| Height | 18 mm |
| Width | 67 mm |
| Depth | 98 mm |

### System requirements

| Feature | Value |
|---|---|
| Windows operating systems supported | Windows 8, Windows 7 x64, Windows 7 Ultimate x64, Windows 7 Ultimate, Windows 7 Starter x64, Windows 7 Starter, Windows 7 Professional x64, Windows 7 Professional, Windows 7 Home Premium x64, Windows 7 Home Premium, Windows 7 Home Basic x64, Windows 10 x64, Windows 7 Home Basic, Windows 7 Enterprise x64, Windows 7 Enterprise, Windows 7, Windows 10 Home x64, Windows 8.1 Pro, Windows 8.1 x64, Windows 8.1 Pro x64, Windows 8 Enterprise, 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 10 Pro, Windows 10 Pro x64, Windows 10, Windows 10 Education, Windows 10 Education x64, Windows 10 Enterprise, Windows 10 Enterprise x64, Windows 10 Home, Windows 10 IOT Core, Windows 10 IoT Enterprise |
| 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 |

### Performance

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

### Logistics data

| Feature | Value |
|---|---|
| Master (outer) case height | 317 mm |
| Master (outer) case width | 355 mm |
| Master (outer) case length | 690 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 | 5, 6, 7, 8, 9 |
| Stop bits | 1.5, 2, 1 |
| Parity bit | Mark, Space, Odd, N, Even |
| Flow Control type | XON/XOFF, RTS/CTS, N |
| FIFO (First In, First Out) | 256 |

### Packaging data

| Feature | Value |
|---|---|
| Package depth | 172 mm |
| Package height | 32 mm |
| Package width | 142 mm |
| Mounting brackets included | Yes |

## FAQ

### How much does the 2-port PCI Express RS232 Serial Adapter Card StarTech PEX2S953LP 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 — 63 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 22.06.2026 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: Cash payment, 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, 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 2-port PCI Express RS232 Serial Adapter Card StarTech PEX2S953LP?

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

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