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

Manufacturer: Startech | Model: PEX2S953 | Product ID: 5208 | Warranty: Lifetime
£51.20 (inc. VAT)
33 in stock
100% Money Back Guarantee - Risk Free

Product Technical Specification

Ports & interfaces
Host interfacePCIe
Output interfaceSerial
Expansion card standardPCIe 1.1
Serial ports quantity2
Serial interface typeRS-232
Design
InternalYes
Product colourGreen
Mean time between failures (MTBF)222366
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 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 complianceYes
Sustainability certificatesCE,RoHS
Weight & dimensions
Width63
Depth75
Height15
Weight56
Packaging data
Quantity1
Quick installation guideYes
Package width170
Package depth142
Package height30
Package weight136
Logistics data
Harmonized System (HS) code84733020
Products per master (outer) case75
Master (outer) case width685
Master (outer) case length345
Master (outer) case height306

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 | 921.6Kbps | Windows® and Linux® CompatibleThis multiport PCI Express RS232 serial adapter card lets you add two RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot, as if they were native serial ports. The dual port PCIe serial card enables you to interact with serial devices, such as card readers, printers, PIN pads, and modems, at speeds of up to 921.6Kbps.Maximum CompatibilityWith broad OS support, including for Windows and Linux, this 2 port PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with a full-profile bracket, and includes optional low-profile brackets, so installation is easy regardless of the case form factor. This card is a direct replacement for PEX2S952 .Experience Optimal TechnologyThis PCIe to serial adapter supports the following features:• Industry standard 16950 UART compatible• Supports max baud rate of up-to 921.6Kbps• Provides 5/12V power output on Pin 9 when external power is connected• 256-byte depth FIFO cache per transmitter and receiver• Supports 9, 8, 7, 6, 5 data bits (one per port)• Asix AX99100 chipset• Base PCI Express 1.1 compliant• Low and full-profile brackets includedThe Choice of IT Pros Since 1985StarTech.com conducts thorough compatibility and performance testing on all our products to ensure we are meeting or exceeding industry standards and providing high-quality products to IT Professionals. Our local StarTech.com Technical Advisors have broad product expertise and work directly with our StarTech.com Engineers to provide support for our customers both pre and post-sales.PEX2S953 is backed by a StarTech.com lifetime warranty and free lifetime technical support.The StarTech.com Advantage
Ports & interfaces
Host interfacePCIe
Output interfaceSerial
Expansion card standardPCIe 1.1
Serial ports quantity2
Serial interface typeRS-232
Design
InternalYes
Product colourGreen
Mean time between failures (MTBF)222366
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 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 complianceYes
Sustainability certificatesCE,RoHS
Weight & dimensions
Width63
Depth75
Height15
Weight56
Packaging data
Quantity1
Quick installation guideYes
Package width170
Package depth142
Package height30
Package weight136
Logistics data
Harmonized System (HS) code84733020
Products per master (outer) case75
Master (outer) case width685
Master (outer) case length345
Master (outer) case height306

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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).

We charge a one off delivery cost as outlined below regardless of how many items you order or the weight of your order.

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Estimated delivery times are taken from the next available working day available for delivery. For example if an order was despatched on a working Wednesday by 3pm, the first available working day for delivery would be Thursday provided you placed your order by 3pm on the Wednesday. If the next available weekday is a UK bank holiday/public holiday then your order will be despatched on the next available working day.

Our warehouse reserves the right to upgrade the delivery method you select on your order.

Our available delivery options*

Contact us for a shipping quote.

*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
- Earphones
- Custom made and designed products, such as flash memory products with custom logos on them, e.g. USB flash drives and memory cards with your own logo

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.