StarTech.com 2-port PCI Express RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller Card - PCIe to Serial DB9 - 16950 UART - Low Profile Expansion Card - Windows & Linux

Manufacturer: Startech | Model: PEX2S953LP | Product ID: 7217 | Warranty: Lifetime
£46.40 (inc. VAT)
24 in stock
100% Money Back Guarantee - Risk Free

Product Technical Specification

Ports & interfaces
Host interfaceMini PCI Express
Output interfaceSerial
Expansion card standardPCIe 1.1
Serial ports quantity2
Serial interface typeRS-232
Peripheral (Molex) power connectors (4-pin)1
Design
InternalYes
Mean time between failures (MTBF)222366
CertificationCE, FCC
Features
ChipsetAsix AX99100
Baud rate921.6
FIFO (First In, First Out)256
Data bits5,6,7,8,9
Stop bits1,1.5,2
Parity bitEven,Mark,N,Odd,Space
Flow Control typeN,RTS/CTS,XON/XOFF
Operational conditions
Operating temperature (T-T)-10 - 80
Storage temperature (T-T)-20 - 100
Operating relative humidity (H-H)5 - 85
System requirements
Windows operating systems supportedWindows 10,Windows 10 Education,Windows 10 Education x64,Windows 10 Enterprise,Windows 10 Enterprise x64,Windows 10 Home,Windows 10 Home x64,Windows 10 IOT Core,Windows 10 IoT Enterprise,Windows 10 Pro,Windows 10 Pro x64,Windows 10 x64,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 Ultimate x64,Windows 7 x64,Windows 8,Windows 8 Enterprise,Windows 8 Enterprise x64,Windows 8 Pro,Windows 8 Pro x64,Windows 8 x64,Windows 8.1,Windows 8.1 Enterprise,Windows 8.1 Enterprise x64,Windows 8.1 Pro,Windows 8.1 Pro x64,Windows 8.1 x64
Linux operating systems supportedYes
Server operating systems supportedWindows Server 2003,Windows Server 2008 R2,Windows Server 2012,Windows Server 2012 R2,Windows Server 2016
Technical details
Sustainability certificatesRoHS
Weight & dimensions
Width67
Depth98
Height18
Weight55.6
Packaging data
Quantity1
Mounting brackets includedYes
ManualYes
Package width142
Package depth172
Package height32
Package weight146.4
Logistics data
Harmonized System (HS) code84733020
Products per master (outer) case75
Master (outer) case width355
Master (outer) case length690
Master (outer) case height317

Delivery Options

Economy Delivery
FREE
Economy Delivery

Economy Delivery (UK)

Estimated delivery date: Wed 26th Aug 2026 to Sat 29th Aug 2026
Business Express
£6.95
Business Express

Business Express

Estimated delivery date: Tue 25th Aug 2026 to Thu 27th Aug 2026
View all Delivery Options & International Rates
PCI Express to Serial Adapter | 921.4Kbps | Windows and Linux Compatible

This RS232 Serial Adapter Card lets you add two RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot. It enables you to interact with serial devices, such as card readers, printers, PIN pads, and modems, at speeds of up to 921.4Kbps.

Maximum Compatibility

With broad OS support, including for Windows and Linux, this PCI Express card is easy to integrate into mixed environments. The card comes pre-configured with a low-profile bracket, and includes an optional full-profile bracket, so installation is easy regardless of the case form factor.

Experience Optimal Technology

This PCIe to serial adapter supports the following features:

Compatible with industry standard 16950 UART

Supports max baud rate of up-to 921.4Kbps

Provides 5/12V power output on Pin 9 when external power is connected

256-byte depth FIFO per transmitter and receiver

Supports 9, 8, 7, 6, 5 data bits

Asix AX99100 chipset

PCI Express 1.1 compliant

PEX2S953LP is backed by a StarTech.com lifetime warranty and free lifetime technical support.

The StarTech.com Advantage

- 2 PORT SERIAL CARD: Serial controller card w/16950 UART based on ASIX AX99100, allows 2x DB9 ports w/bi-directional RS232 speeds up to 921.6Kbps per port, available 256 byte FIFO buffer & 9th data bit
- OPTIONAL CONFIGURABLE POWER: PCI Express RS232 serial adapter card provides choice of 12v, 5v, or none through pin 9 w/up to 2A total; Each of the 2 ports are individually configurable
- LOW PROFILE BRACKETS PRE-INSTALLED: PCIe multiport serial card comes w/ a low profile bracket preinstalled & a full profile bracket is incl for versatile install; supports Windows XP and up & Linux
Ports & interfaces
Host interfaceMini PCI Express
Output interfaceSerial
Expansion card standardPCIe 1.1
Serial ports quantity2
Serial interface typeRS-232
Peripheral (Molex) power connectors (4-pin)1
Design
InternalYes
Mean time between failures (MTBF)222366
CertificationCE, FCC
Features
ChipsetAsix AX99100
Baud rate921.6
FIFO (First In, First Out)256
Data bits5,6,7,8,9
Stop bits1,1.5,2
Parity bitEven,Mark,N,Odd,Space
Flow Control typeN,RTS/CTS,XON/XOFF
Operational conditions
Operating temperature (T-T)-10 - 80
Storage temperature (T-T)-20 - 100
Operating relative humidity (H-H)5 - 85
System requirements
Windows operating systems supportedWindows 10,Windows 10 Education,Windows 10 Education x64,Windows 10 Enterprise,Windows 10 Enterprise x64,Windows 10 Home,Windows 10 Home x64,Windows 10 IOT Core,Windows 10 IoT Enterprise,Windows 10 Pro,Windows 10 Pro x64,Windows 10 x64,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 Ultimate x64,Windows 7 x64,Windows 8,Windows 8 Enterprise,Windows 8 Enterprise x64,Windows 8 Pro,Windows 8 Pro x64,Windows 8 x64,Windows 8.1,Windows 8.1 Enterprise,Windows 8.1 Enterprise x64,Windows 8.1 Pro,Windows 8.1 Pro x64,Windows 8.1 x64
Linux operating systems supportedYes
Server operating systems supportedWindows Server 2003,Windows Server 2008 R2,Windows Server 2012,Windows Server 2012 R2,Windows Server 2016
Technical details
Sustainability certificatesRoHS
Weight & dimensions
Width67
Depth98
Height18
Weight55.6
Packaging data
Quantity1
Mounting brackets includedYes
ManualYes
Package width142
Package depth172
Package height32
Package weight146.4
Logistics data
Harmonized System (HS) code84733020
Products per master (outer) case75
Master (outer) case width355
Master (outer) case length690
Master (outer) case height317

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We will despatch your order the very same day if we receive cleared payment by 12:00 pm Mon-Fri.

These delivery estimates apply when you order up to 12:00 pm Mon-Fri (excluding public holidays).

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Our available delivery options*

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*All delivery times are estimated unless stated.

Product Returns Note

Buykingston offers a simple, hassle-free returns policy. If for whatever reason you are not happy with the item purchased, you can return it to us within 14 days of receipt for a refund. This applies to items purchased direct through Buykingston only.

Our 14 Day Returns Money Back Guarantee:
For items returned in resaleable condition, with all original packaging. If an item has been opened for inspection but shows signs of use beyond that, a deduction may apply to reflect the reduced value — see our full Terms & Conditions (Section 12) for details.

Some items are excluded from our money-back guarantee unless they have developed a fault. These include:

- Headphones
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Returns FAQs

What is your returns criteria?
14 days from date of receipt, or expected date of receipt on non-tracked items.

How do I go about returning my order?
Please contact us via our contact page with your order number. We will provide you with an RMA number and return instructions, including your return deadline and whether a freepost label applies to your order.

Do I need to contact you before returning my order?
Yes, to obtain an RMA number before sending anything back.

Does my item have to include its original packaging?
Yes, to qualify for our 14 day money-back guarantee. For faulty items, we understand you may no longer have the original packaging.

Who pays for return postage?
If your item is faulty, damaged, or not as described, we cover reasonable return postage, or provide a freepost label where available. If you are returning an item for another reason (including simply changing your mind), you are responsible for return postage unless we have expressly confirmed a freepost label in your RMA email — we recommend using a tracked and insured service for items of significant value.

Who deals with the warranty on a faulty item?
We will. In some circumstances we may ask you to contact the manufacturer directly for assistance.

Please ensure you have read and comply in full with Sections 11–13 of our Terms & Conditions.