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Next-working-day delivery. Order before 17:30 (England & Wales) or 16:00 (Northern Ireland, Republic of Ireland, Scotland) to receive next-working-day delivery. Orders placed before 17:30 Friday are delivered Monday; after 17:30 Friday arrive Tuesday. Upgrades — pre-9, pre-10:30, pre-noon, special and secure bulk — available at extra cost.

Orders over £100 (ex VAT) receive FREE next-working-day delivery across the UK.

Instant digital delivery. Software licences, subscriptions, warranties & insurance, and electronic copies are delivered the same day via email — provided a valid email address is entered at checkout.

Next-working-day delivery*

Estimated delivery:Next working day

Trusted couriersTracked UK mainland delivery

*UK business days (Mon–Fri). Orders placed after Friday 17:30 will be dispatched Monday for Tuesday delivery. Subject to stock, payment clearance and courier network conditions.

StarTech.com 2-port PCI Express RS232 Serial Adapter Card, PCIe RS232 Serial Host Controller Card, PCIe to Dual Serial DB9 COM Port Card, 16950 UART, Expansion Card, Windows, macOS, Linux - Full/Low-Profile (PEX2S953) - Serial adapter - PCIe - RS-232 x 2

Name: StarTech.com 2-port PCI Express RS232 Serial Adapter Card, PCIe RS232 Serial Host Controller Card, PCIe to Dual Serial DB9 COM Port Card, 16950 UART, Expansion Card, Windows, macOS, Linux Full/Low-Profile (PEX2S953) Serial adapter PCIe RS-232 x 2
Brand: StarTech
SKU: PEX2S953
Price: 45.77 GBP
Availability: InStock

Manuf P/N: PEX2S953

APAXON#: 5687345

EAN: 0065030888332

Internal
Host interface: PCIe
Output interface: Serial
Green

Stock5

ConditionNew

Exc. VAT

£38.14

Inc. VAT £45.77

Quantity

Notify me when available

Sales & Technical

Phone: 0161 464 9941

Email: sales@apaxon.co.uk

Manufacturer Warranty

Manufacturer warranty applies. Warranty periods and service levels vary by brand and product type.

Apaxon® is an authorised reseller of STARTECH. Warranty claims, repairs, replacements, and credits are fulfilled strictly in accordance with the manufacturer's terms and conditions.

Returns Policy

Business & Consumer Purchases

Orders placed for business use, resale, or onward supply are treated as Business-to-Business (B2B) transactions. B2B sales do not carry an automatic right of cancellation.

Nothing in this policy affects statutory consumer rights under UK law.

Consumer Cancellation (B2C Only)

Consumers may cancel within 14 days of delivery under the Consumer Contracts Regulations 2013.
Cancellation must be confirmed in writing within 14 days of delivery.
Goods must be returned within 14 days of cancellation.
Items must be unused beyond reasonable inspection and in resaleable condition.
Return shipping costs are the customer's responsibility.
Prepaid return labels are not provided for change-of-mind returns.
Refunds are processed after inspection and issued to the original payment method.

Faults & Delivery Issues

Transit damage or shortages must be reported within 48 hours of delivery.
Visible defects must be reported within 7 days of delivery.
Hidden faults must be reported within 7 days of discovery.
Returns require prior authorisation and a valid RMA reference.
Failure to report within these timeframes may affect eligibility for return or claim.

Business Returns (B2B)

Business customers do not have an automatic right to return non-faulty goods.

Supply chain authorisation
Restocking fees (typically 15–25%)
Inspection approval
Non-refundable outbound carriage

Return shipping is the responsibility of the buyer unless agreed otherwise.

Non-Returnable Items

Software, licences, activation keys, and digital products
Special-order or non-standard procurement items
Opened consumables
Items not in resaleable condition

Overview

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

Specifications

Ports & interfaces

Host interface: PCIe
Output interface: Serial
Expansion card standard: PCIe 1.1
Serial ports quantity: 2
Serial interface type: RS-232

Design

Internal: Yes
Product colour: Green
Mean time between failures (MTBF): 222366 h

Features

Chipset: Asix AX99100
Baud rate: 921.6 Kbit/s
FIFO (First In, First Out): 256 B
Data bits: 5, 6, 7, 8, 9
Stop bits: 1, 1.5, 2
Parity bit: Even, Mark, No, Odd, Space
Flow Control type: No, RTS/CTS, XON/XOFF

Operational conditions

Operating temperature (T-T): -10 - 80 °C
Storage temperature (T-T): -20 - 100 °C
Operating relative humidity (H-H): 5 - 85%

System requirements

Windows operating systems supported: 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 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 supported: Yes
Server operating systems supported: Windows Server 2003, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016

Technical details

Compliance certificates: CE, RoHS
Sustainability compliance: Yes

Weight & dimensions

Width: 63 mm
Depth: 75 mm
Height: 15 mm
Weight: 56 g

Packaging data

Quantity: 1
Quick installation guide: Yes
Package width: 170 mm
Package depth: 142 mm
Package height: 30 mm
Package weight: 136 g

Logistics data

Harmonized System (HS) code: 84733020
Products per master (outer) case: 75 pc(s)
Master (outer) case width: 685 mm
Master (outer) case length: 345 mm
Master (outer) case height: 306 mm

Customer Reviews

“delivery was very quick and laptop was exactly what was advertised”

Reviews are independently collected and not edited by Apaxon®.

“Bought for my office, came new as expected and item is as described. Love it”

Reviews are independently collected and not edited by Apaxon®.

“did the job exactly what was advertised, would highly recommend”

Reviews are independently collected and not edited by Apaxon®.

What our clients say

Verified customer reviews

Collected independently on VouchRate

★★★★★

Kaydron is excellent!

Really starting to transform my business to where I want it to be 😄

Apaxon replied: Thank you so much for the fantastic review! 😄 It’s been a pleasure working with you and seeing the business take shape. I’m really glad we’re helping move things in the direction you’ve been aiming for, and there’s plenty more to come! Thanks again for your trust and support — it’s genuinely appreciated! — Kadron

Chris · 12 September 2026

★★★★★Verified purchase

Efficient and reliable

Purchased an Apple product, was cautious initially as not used this site before but it arrived the next day even though courier left it on door step. will definitely recommend Apaxon!

Apaxon replied: Thank you so much for your review! We completely understand being cautious when trying a new website, so it’s great to hear that we could make a good first impression. We’re delighted your Apple product arrived the next day and that you were happy with the service. We really appreciate your recommendation and hope to welcome you back to Apaxon again soon! 😊

Lorraine Johnson · 5 September 2026

★★★★★

Great Company to deal with.

Great job by Kadron and the team. Definitely recommend for IT services

Apaxon replied: Thank you for the fantastic review! It’s been a pleasure supporting Mitsiland. We really appreciate your trust in us and are always happy to help keep everything running smoothly. We look forward to continuing to support you and the team! 👍

Mitsiland · 4 September 2026

★★★★★Verified purchase

Brilliant company

Apaxon Limited provide an excellent service to my business. Very knowledgeable and always responsive. Any IT issue that arises is always swiftly solved by the team at Apaxon

Apaxon replied: Thank you for this thoughtful review :-)

Suzanne Sill · 1 September 2026

MitsilandPremium Automotive Service & Repair Specialist

Apaxon®'s IT solutions have optimised our operations and significantly boosted our productivity. The team's reliable support and expertise have been genuinely invaluable to our business.

Managed IT★★★★★

Floor AngelsProfessional Cleaning Services

Apaxon®'s support has been excellent across every interaction. Their responsiveness and attention to detail make our daily operations much easier and more reliable to manage.

IT Support★★★★★

Cleaning Angels YorkshireSpecialist Cleaning Services

With Apaxon®'s help, our security posture and operational efficiency have greatly improved. We now have complete confidence in our IT infrastructure and the people behind it.

Cybersecurity★★★★★

Sagars 365Conservatory Roof Insulation

Apaxon®'s customer service has exceeded every expectation. Their prompt, professional support has been crucial for maintaining business continuity and keeping our team productive.

Managed IT★★★★★

Cotswold Magic CarpetsCarpet & Flooring Specialist

I approached Kadron after a friend recommended him, having used him for their own business. I'm so glad I did! 😃 He is simply transforming my business and taking it exactly where it needs to be. He's incredibly patient with me and all of my ideas 😂, really listens to what I want, and somehow manages to bring it all together. I couldn't recommend him highly enough!

via Google

Business IT★★★★★

Geoffs Garden OrnamentsGarden Ornaments & Outdoor Living

Kadron is amazing, he has helped our business and done a full make over on our websites. Kadron has also shared his knowledge and provided the information I need in great detail, is always on standby to assist and is fast at acting upon any tasks I throw at him. It's been a great pleasure, and have built a lovely business relationship for all our needs.

Also for Just Fountainsvia Google

Web Development★★★★★

Thistlemist FarmFarm & Countryside Business

Kadron's service is second to none… I will forever be indebted to him for how he has gone above & beyond to help me with my website & business in general. Thank you Kadron.

via Google

Web Development★★★★★

Testimonials from Apaxon® IT, web and support clients, including verbatim Google reviews. They describe our service, not this product.

Technology Partners

All Verified

Authorised Partner

Lenovo

Tier 2 Partner

Intel

Authorised Partner

Commercial Traditional Dealer

Registered Partner

Infrastructure Partner

Microsoft

Commercial Partner

StarTech.com 2-port PCI Express RS232 Serial Adapter Card, PCIe RS232 Serial Host Controller Card, PCIe to Dual Serial DB9 COM Port Card, 16950 UART, Expansion Card, Windows, macOS, Linux - Full/Low-Profile (PEX2S953) - Serial adapter - PCIe - RS-232 x 2

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