# Serial Adapter Card StarTech.com PEX4S553

**URL:** https://aio.lv/en/product--startech-pex4s553--298305
**Data updated:** 2025-12-28 21:14 (EET)
**Category:** I/O Adapters & Controllers
**Manufacturer:** StarTech
**Manufacturer code:** PEX4S553
**EAN:** 0065030843553
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 144.99 €
**Prices and availability valid until:** 2026-07-18 23:59
**Price without VAT (21%):** 119.83 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--startech-pex4s553--298305

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 14.07.2026 | free |
| Pickup points | 17.07.2026 | 1.99 EUR |
| Courier delivery to door | 17.07.2026 | 4.99 EUR |

## Summary description

The StarTech.com 4 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART provides four RS-232 serial ports for connecting serial devices. It features a PCIe host interface, 128 Kbit/s baud rate, and a FIFO buffer of 256 B. Compatible with Windows and Mac operating systems, it ensures reliable performance with a mean time between failures (MTBF) of 26280 hours. Ideal for industrial and commercial applications requiring serial communication.

## Long description

The StarTech.com PEX4S553 Serial Adapter Card adds four RS-232 (DB9) serial ports to a standard or small form factor computer using a single PCI Express expansion slot. Based on a native single-chip PCIe design with 16550 UART, the card offers reliable serial connectivity for industrial and commercial peripherals while including both standard and low-profile brackets for compatibility with almost any PC case.
Advantages
The native single-chip PCI Express chipset delivers true PCIe performance and reduces CPU load by up to 48% compared with bridge-chip serial cards. The adapter supports a 128 Kbit/s baud rate and includes a 256-byte FIFO buffer for stable data transfer. It is compatible with common operating systems and is backed by StarTech.com’s lifetime warranty and free lifetime technical support.
Suitable for
Connecting legacy RS-232 devices such as barcode scanners, POS systems and modems
Industrial automation and control equipment requiring serial interfaces
Small form factor and standard desktop PCs that need additional serial ports
Key specifications
Model: StarTech.com PEX4S553
Interface: PCIe (single-lane)
Serial ports: 4 × RS-232 (DB9)
UART: 16550
Baud rate: up to 128 Kbit/s
FIFO buffer: 256 bytes
Form factor: includes standard and low-profile/half-height brackets
Weight: 0.074 kg
MTBF: 26,280 hours
How to use
Power down the computer and insert the PEX4S553 into an available PCI Express expansion slot. Secure the card with the appropriate bracket (standard or low-profile) depending on the PC case. Reassemble the system, power it on and install any required drivers for your operating system. Connect RS-232 devices to the DB9 ports and configure serial communication parameters (baud rate, parity, data bits, stop bits) in your device software.
Usage recommendations
Install the included low-profile brackets for small form factor cases and verify driver compatibility with your OS before deployment. For stable transfers, match the configured baud rate and flow control settings on both ends of the serial link.

## Specifications

### Operational conditions

| Feature | Value |
|---|---|
| Operating relative humidity (H-H) | 5 - 85 |
| Storage temperature (T-T) | -20 - 60 |
| Operating temperature (T-T) | 0 - 50 |

### Technical details

| Feature | Value |
|---|---|
| Compliance certificates | RoHS |

### Ports & interfaces

| Feature | Value |
|---|---|
| Serial interface type | RS-232 |
| Serial ports quantity | 4 |
| Host interface | PCIe |
| Output interface | Serial |

### Other features

| Feature | Value |
|---|---|
| Quantity | 1 |
| Manual | Yes |
| Drivers included | Yes |
| Other operating systems supported | Windows Embedded POSReady 2009, Windows Embedded Standard 2009, Windows XP Embedded |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.074 kg |
| Package weight | 230 g |
| Height | 19 mm |
| Width | 130 mm |
| Depth | 120 mm |

### System requirements

| Feature | Value |
|---|---|
| Windows operating systems supported | Windows Vista Business, Windows Vista Ultimate x64, Windows Vista Ultimate, Windows Vista Home Premium x64, Windows Vista Home Premium, Windows Vista Home Basic x64, Windows Vista Home Basic, Windows Vista Enterprise x64, Windows Vista Enterprise, Windows Vista Business x64, Windows 98SE, Windows 95, Windows 8.1 x64, Windows 8.1 Pro x64, Windows 8.1 Enterprise x64, Windows 8.1 Enterprise, Windows 8.1 Pro, Windows XP Home, Windows XP Professional x64, Windows XP Professional, Windows XP Home x64, Windows 8 x64, Windows 10, Windows 10 Education, Windows 10 Education x64, Windows 10 Enterprise, Windows 10 Enterprise x64, Windows 10 Home, Windows 10 Home x64, Windows 10 Pro, Windows 10 Pro x64, Windows 2000, Windows 7, Windows 7 Enterprise, Windows 7 Enterprise x64, Windows 7 Home Basic, Windows 7 Home Basic x64, Windows 7 Home Premium x64, Windows 8.1, Windows 8 Pro x64, Windows 8 Pro, Windows 8 Enterprise x64, Windows 8 Enterprise, 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 |
| Mac operating systems supported | Mac OS X 10.7 Lion, Mac OS X 10.9 Mavericks, Mac OS X 10.8 Mountain Lion, Mac OS X 10.6 Snow Leopard, Mac OS X 10.5 Leopard, Mac OS X 10.4 Tiger, Mac OS X 10.10 Yosemite |
| Linux operating systems supported | Y |
| Server operating systems supported | Windows Server 2019, 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, REACH |
| Mean time between failures (MTBF) | 26280 h |
| Chipset | ASIX - MCS9904CV-AA |

### Logistics data

| Feature | Value |
|---|---|
| Harmonized System (HS) code | 84733020 |

### Features

| Feature | Value |
|---|---|
| Baud rate | 128 Kbit/s |
| Data bits | 8, 7, 6, 5 |
| FIFO (First In, First Out) | 256 |

### Packaging data

| Feature | Value |
|---|---|
| Package depth | 170 mm |
| Package height | 30 mm |
| Package width | 141 mm |
| Mounting brackets included | Yes |

## FAQ

### How much does the Serial Adapter Card StarTech.com PEX4S553 cost, and is it available for purchase?

The price is 144.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 1 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 14.07.2026 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, Installment. All transactions are 100% secure and encrypted.

### Can Serial Adapter Card StarTech.com PEX4S553 be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### 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.

## Image

https://aio.lv/img/cache/product/298305/65746215_large.webp