# 4-port PCI Express RS232 Serial Adapter Card StarTech.com PEX4S953LP Low Profile

**URL:** https://aio.lv/en/product--startech-pex4s953lp--10974035
**Data updated:** 2025-12-30 15:00 (EET)
**Category:** I/O Adapters & Controllers
**Manufacturer:** StarTech
**Manufacturer code:** PEX4S953LP
**EAN:** 0065030887052
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 129.99 €
**Prices and availability valid until:** 2026-07-17 23:59
**Price without VAT (21%):** 107.43 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--startech-pex4s953lp--10974035

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 17.07.2026 | free |
| Pickup points | 22.07.2026 | 1.99 EUR |
| Courier delivery to door | 22.07.2026 | 4.99 EUR |

## Summary description

The StarTech.com 4-port PCI Express RS232 Serial Adapter Card features a PCIe interface, 16950 UART, and supports Windows and Linux. It provides reliable serial communication with a baud rate of 921.6 Kbit/s and a low profile design for compact installations.

## Long description

The StarTech.com 4-port PCI Express RS232 Serial Adapter Card (PEX4S953LP) adds four DB9 RS232 serial ports to a computer via a PCI Express slot. Designed for reliable serial communication, the card supports industry-standard 16950 UART and a maximum baud rate of 921.6 Kbps. It includes low-profile brackets and optional full-profile brackets for installation in different chassis, and is compatible with Windows and Linux.
Advantages
This PCIe to serial adapter provides four independent RS232 ports with 256-byte FIFO buffers per transmitter and receiver, support for multiple data bit lengths (9, 8, 7, 6, or 5 bits per port), and 5/12V output on pin 9 when external power is present. The card uses the Asix AX99100 chipset and is PCI Express 1.1 compliant, offering broad OS compatibility and a compact low-profile design for space-constrained systems.
Suitable for
Connecting serial printers, card readers, and PIN pads to modern PCs
Integrating legacy serial devices in POS and retail environments
Installing in kiosks, ATMs, or embedded workstations
Adding serial ports to Windows- or Linux-based systems for device control or telemetry
Key specifications
Manufacturer: StarTech.com
Model / MPN: PEX4S953LP
Interface: PCI Express (PCIe) 1.1
Serial ports: 4 × RS232 (DB9)
UART: 16950-compatible
Maximum baud rate: 921.6 Kbps
FIFO: 256-byte depth per transmitter/receiver
Chipset: Asix AX99100
Power output: 5/12V on Pin 9 (when external power connected)
Form factor: Low-profile with optional full-profile brackets
OS compatibility: Windows and Linux
Weight: 0.264 kg
Product colour: Green
How to use
Power down the computer, install the card into an available PCIe slot and secure it with the appropriate bracket (low-profile or full-profile). If required by your serial devices, connect an external power source to enable 5/12V output on pin 9. Boot the system and install the appropriate drivers for your Windows or Linux distribution if they are not detected automatically. Configure port settings (baud rate, data bits, parity, stop bits) in your OS or application to match the connected device, up to 921.6 Kbps.
Usage recommendations
Use shielded serial cables for improved signal integrity in electrically noisy environments, and verify driver compatibility with your specific OS version. For installations in compact systems, confirm bracket selection before installation to ensure a proper fit.

## 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 certificates | RoHS |

### Ports & interfaces

| Feature | Value |
|---|---|
| Host interface | PCIe |
| Output interface | Serial |
| Expansion card standard | PCIe 1.1 |

### Other features

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

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.264 kg |
| Package weight | 370 g |
| Height | 18 mm |
| Width | 75 mm |
| Depth | 63 mm |

### System requirements

| Feature | Value |
|---|---|
| Windows operating systems supported | Windows 10 Pro x64, Windows 10 Pro, Windows 10 IOT Core, Windows 10 Home x64, Windows 10 x64, Windows 10 Education x64, Windows 10 Home, Windows 10 Enterprise x64, Windows 10 Enterprise, Windows 10, Windows 10 Education, Windows 8.1, Windows 7, Windows 7 Enterprise, Windows 7 Enterprise x64, Windows 7 Home Basic, Windows 7 Home Basic x64, Windows 7 Home Premium, Windows 7 Home Premium x64, Windows 7 Professional, 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 Pro x64, Windows 8 Pro, Windows 8 Enterprise x64, Windows 8 Enterprise, Windows 8, Windows 7 Ultimate x64 |
| 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 |
|---|---|
| Certification | CE, FCC |
| Mean time between failures (MTBF) | 214358 h |
| Chipset | Asix AX99100 |

### Logistics data

| Feature | Value |
|---|---|
| Master (outer) case height | 235 mm |
| Master (outer) case width | 480 mm |
| Master (outer) case length | 350 mm |
| Products per master (outer) case | 16 pc(s) |
| Harmonized System (HS) code | 84733020 |

### Features

| Feature | Value |
|---|---|
| Baud rate | 921.6 Kbit/s |
| Data bits | 6, 5, 7, 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 |
|---|---|
| Cables included | Serial |
| Package depth | 149 mm |
| Package height | 51 mm |
| Package width | 213 mm |
| Quick installation guide | Yes |
| Mounting brackets included | Yes |

## FAQ

### How much does the 4-port PCI Express RS232 Serial Adapter Card StarTech.com PEX4S953LP cost, and is it available for purchase?

The price is 129.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 74 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 17.07.2026 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 4-port PCI Express RS232 Serial Adapter Card StarTech.com PEX4S953LP?

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/10974035/61396697_large.webp