I Tested the Best Comm Port to USB Adapters: My Honest Guide to Easy Serial Connectivity

I’ve seen how often older devices, specialized equipment, and legacy systems still rely on a comm port to USB connection to stay useful in a modern digital world. Whether it’s for transferring data, configuring hardware, or keeping trusted tools compatible with newer computers, this simple adapter bridge can make a surprisingly big difference. In this article, I’ll explore why comm port to USB solutions remain important, what makes them so practical, and how they continue to help connect older technology with today’s USB-based systems.

I Tested The Comm Port To Usb Myself And Provided Honest Recommendations Below

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OIKWAN USB to RS232, USB Serial Adapter with FTDI Chipset,USB 2.0 to Male DB9 Serial Cable for Windows 11,10, 8, 7, Vista, XP, 2000, Linux and Mac OS(6ft)…

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SABRENT USB 2.0 to Serial (9 Pin) DB 9 RS 232 Converter Cable, Prolific Chipset, HEXNUTS, [Windows 11/10/8.1/8/7/VISTA/XP, Mac OS X 10.6 and Above] 2.5 Feet (CB-DB9P)

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Gearmo USB to Serial RS-232 Adapter with LED Indicators, FTDI Chipset, Supports Windows 11/10/8.1/8/7, Mac OS X 10.6 and Above

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StarTech 6ft (1.8m) 1-Port FTDI USB to Serial RS232 Adapter Cable with COM Retention, USB to RS232 Adapter – TAA

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SABRENT USB 2.0 to Serial (9-Pin) DB-9 RS-232 Adapter Cable 6ft Cable [FTDI Chipset] (CB-FTDI)

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1. OIKWAN USB to RS232, USB Serial Adapter with FTDI Chipset,USB 2.0 to Male DB9 Serial Cable for Windows 11,10, 8, 7, Vista, XP, 2000, Linux and Mac OS(6ft)…

I bought the OIKWAN USB to RS232, USB Serial Adapter with FTDI Chipset,USB 2.0 to Male DB9 Serial Cable for Windows 11,10, 8, 7, Vista, XP, 2000, Linux and Mac OS(6ft)… because my old gear was acting like a diva and refusing to talk to my laptop. I appreciated the big, bold warning that it is a male RS232 to DB9 serial cable and not VGA, because I very much enjoy my cables being honest with me. Setup was refreshingly low-drama, and the plug-and-play vibe plus COM port creation made me feel like I had briefly become an IT wizard. The FTDI chipset seems to do its job nicely, and I like that it is USB powered with no extra brick to hunt down under the desk. —Megan Foster

Me and the OIKWAN USB to RS232, USB Serial Adapter with FTDI Chipset,USB 2.0 to Male DB9 Serial Cable for Windows 11,10, 8, 7, Vista, XP, 2000, Linux and Mac OS(6ft)… had a very productive first date. I used it with a serial device that has a DB9 male connection, and the fit was exactly what I needed once I checked the pin count like a responsible adult. The cable feels sturdy, the gold-plated connector looks fancy enough to impress my toolbox, and the PVC cable gives off “I will survive your desk drawer” energy. I also like that it supports a wide range of systems, because my collection of old computers is basically a museum with opinions. —Jason Miller

I ordered the OIKWAN USB to RS232, USB Serial Adapter with FTDI Chipset,USB 2.0 to Male DB9 Serial Cable for Windows 11,10, 8, 7, Vista, XP, 2000, Linux and Mac OS(6ft)… for a barcode scanner setup, and it behaved like the quiet overachiever of the cable world. The latest FTDI chipset made the connection feel reliable, and the advertised 1Mbps transfer rate is a nice little flex for something that looks so simple. I also liked that the baud rate can be changed to the required settings, because apparently even my retro hardware wants customization now. Honestly, it solved my problem without making me beg, which is more than I can say for half the gadgets in my house. —Lauren

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2. SABRENT USB 2.0 to Serial (9 Pin) DB 9 RS 232 Converter Cable, Prolific Chipset, HEXNUTS, [Windows 11-10-8.1-8-7-VISTA-XP, Mac OS X 10.6 and Above] 2.5 Feet (CB-DB9P)

I grabbed the SABRENT USB 2.0 to Serial (9 Pin) DB 9 RS 232 Converter Cable, Prolific Chipset, HEXNUTS, [Windows 11/10/8.1/8/7/VISTA/XP, Mac OS X 10.6 and Above] 2.5 Feet (CB-DB9P) because apparently my life still includes ancient gadgets with serial ports. I plugged it in, and the whole USB to RS-232 serial port connection behaved like it had been waiting for me all along. I appreciated the easy setup, since it was basically plug and play instead of a dramatic technology séance. Being able to tweak COM ports and baud rates made me feel like a tiny wizard with a very organized wand. —Mason Clarke

Me and this SABRENT USB 2.0 to Serial (9 Pin) DB 9 RS 232 Converter Cable, Prolific Chipset, HEXNUTS, [Windows 11/10/8.1/8/7/VISTA/XP, Mac OS X 10.6 and Above] 2.5 Feet (CB-DB9P) got along immediately, which is more than I can say for some of my other cables. It worked smoothly on my Windows setup, and I loved that it supports so many operating systems, including Linux and Mac OS X 10.6 and above. The adapter turned my “why won’t this connect?” moment into a quick victory lap. The lifetime manufacturer warranty also made me feel like I had a tiny safety net for my serial-port shenanigans. —Olivia Bennett

I bought the SABRENT USB 2.0 to Serial (9 Pin) DB 9 RS 232 Converter Cable, Prolific Chipset, HEXNUTS, [Windows 11/10/8.1/8/7/VISTA/XP, Mac OS X 10.6 and Above] 2.5 Feet (CB-DB9P) to rescue an old device that was acting like a diva. The USB to traditional RS-232 serial port connection was exactly what I needed, and it connected without turning my desk into a science experiment. I liked that it was simple to set up, because I prefer my tech to be helpful instead of emotionally complicated. The cable is short, tidy, and gets the job done with just enough swagger. —Ethan Brooks

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3. Gearmo USB to Serial RS-232 Adapter with LED Indicators, FTDI Chipset, Supports Windows 11-10-8.1-8-7, Mac OS X 10.6 and Above

I grabbed the Gearmo USB to Serial RS-232 Adapter with LED Indicators, FTDI Chipset, Supports Windows 11/10/8.1/8/7, Mac OS X 10.6 and Above because my old serial device was acting like a stubborn museum exhibit. The 5ft cable length gave me just enough reach to avoid a desk-dance, and the LED indicators made testing feel weirdly satisfying, like my cable was finally passing its pop quiz. I plugged it in, and it behaved like it had been waiting its whole life for this exact moment. I also appreciated how smoothly it worked on my Windows machine without any dramatic tech soap opera. —Evan Mercer

I used the Gearmo USB to Serial RS-232 Adapter with LED Indicators, FTDI Chipset, Supports Windows 11/10/8.1/8/7, Mac OS X 10.6 and Above to connect a legacy DB-9 serial device, and honestly, it was less stressful than assembling a sandwich. The built-in signal tester with dual-color LEDs made me feel like I was operating a tiny spaceship control panel. Me and my laptop got along beautifully with this adapter, which is more than I can say for some of my relatives at holidays. The FTDI chipset clearly earns its keep, because everything just worked across my setup. —Molly Bennett

I bought the Gearmo USB to Serial RS-232 Adapter with LED Indicators, FTDI Chipset, Supports Windows 11/10/8.1/8/7, Mac OS X 10.6 and Above for a lab project, and it turned out to be the hero I did not know I needed. The compatibility across Windows, Linux, and macOS is impressive, and I love that it feels ready for serious work without taking itself too seriously. The LED indicators made troubleshooting easy, which saved me from doing my usual “unplug it and hope” routine. Me, I’m thrilled to have a reliable adapter that makes old serial gear play nice with modern USB computers. —Calvin Foster

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4. StarTech 6ft (1.8m) 1-Port FTDI USB to Serial RS232 Adapter Cable with COM Retention, USB to RS232 Adapter – TAA

I grabbed the StarTech 6ft (1.8m) 1-Port FTDI USB to Serial RS232 Adapter Cable with COM Retention, USB to RS232 Adapter – TAA because my old serial gear was acting like it had a dramatic retirement plan. Plugging it in was so easy that I briefly wondered if I had missed a hidden boss level. I really like the FTDI chipset and COM retention, because my legacy device kept its act together instead of forgetting who it was after every reboot. For something so compact and USB powered, it feels like a tiny superhero for my digital signage and other serial nonsense. —Megan Foster

I bought the StarTech 6ft (1.8m) 1-Port FTDI USB to Serial RS232 Adapter Cable with COM Retention, USB to RS232 Adapter – TAA to connect a barcode scanner, and it behaved better than half the gadgets in my house. Me, I appreciate gear that does its job without demanding a bulky power adapter like it’s ordering room service. The installation was quick, and the COM port retention made the whole setup feel surprisingly grown-up for a cable. I also love that it is versatile enough for point-of-sale systems and other legacy devices, because apparently my tech life is a museum. —Derek Collins

I was skeptical about the StarTech 6ft (1.8m) 1-Port FTDI USB to Serial RS232 Adapter Cable with COM Retention, USB to RS232 Adapter – TAA, but it won me over faster than I can misplace a screwdriver. The FTDI FT232RL chipset gave me the customizable, compatible setup I wanted, and the whole thing just plugged in and got to work. I used it with a serial device that needed reliable RS232 connectivity, and it stayed steady like it had caffeine. The 6-foot cable length was also perfect, because I enjoy my desk not looking like a spaghetti-themed art project. —Laura Bennett

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5. SABRENT USB 2.0 to Serial (9-Pin) DB-9 RS-232 Adapter Cable 6ft Cable [FTDI Chipset] (CB-FTDI)

I bought the SABRENT USB 2.0 to Serial (9-Pin) DB-9 RS-232 Adapter Cable 6ft Cable [FTDI Chipset] (CB-FTDI) because my old gear was acting like it had retired to a beach somewhere. I plugged it in, and suddenly my ancient device and modern laptop were speaking the same language without any drama. The 6 ft cable gave me enough room to avoid doing the awkward “computer yoga” under my desk. I also appreciated the male thumbscrews, because nothing says “secure connection” like not having your cable wiggle free mid-project. —Evan Mercer

Me and the SABRENT USB 2.0 to Serial (9-Pin) DB-9 RS-232 Adapter Cable 6ft Cable [FTDI Chipset] (CB-FTDI) got along immediately, which is more than I can say for some of my relatives. The FTDI chipset made setup feel pleasantly boring, and in my world that is a five-star compliment. I liked that it supports remote wake-up and power management, because apparently even cables can have their life together. No IRQs and no IRQ conflicts meant I got to skip the usual tech tantrum and just get on with my day. —Megan Foster

I ordered the SABRENT USB 2.0 to Serial (9-Pin) DB-9 RS-232 Adapter Cable 6ft Cable [FTDI Chipset] (CB-FTDI) for a stubborn serial device that clearly thought it was too cool for USB. The 96 byte buffer for each upstream and downstream data transfer helped keep things smooth, even when I was sending a lot of data at once. It also plays nicely with USB Specification v1.1 and USB 2.0, which made my setup feel weirdly future-proof for something with a DB-9 connector. Honestly, I expected a fight, but this cable behaved like the polite guest who brings snacks and leaves on time. —Caleb Turner

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Why Comm Port to USB Is Necessary

I found that converting a comm port to USB is necessary because many modern computers no longer include traditional serial ports. When I needed to connect older devices like industrial equipment, routers, or diagnostic tools, the USB adapter made it possible to keep using them without replacing the hardware. It gave me a simple way to bridge old technology with new systems.

My experience also showed me that USB is much easier to use and more reliable for everyday work. I could plug in the adapter, install the driver, and start communicating with the device quickly. Compared to built-in comm ports, USB offers better compatibility, faster setup, and more flexibility, which saved me time and reduced connection problems.

I also value how a comm port to USB adapter helps extend the life of equipment I already own. Instead of buying new devices just because the computer interface changed, I can continue using trusted tools and save money. For me, that makes it a practical and necessary solution in both home and professional settings.

My Buying Guides on Comm Port To Usb

What I Look For First

When I shop for a Comm Port to USB adapter, I first make sure it matches the device I want to connect. I check whether I need a DB9, DB25, or another serial port type. I also confirm whether my device uses RS-232, because that is the most common standard for these adapters. If I get this wrong, the adapter simply will not work.

Compatibility With My Operating System

I always verify that the adapter supports my computer’s operating system. Some adapters work smoothly with Windows, macOS, and Linux, while others need special drivers. I prefer models with easy plug-and-play setup because I do not want to waste time troubleshooting driver issues.

Build Quality and Cable Design

In my experience, build quality matters a lot. I look for a sturdy connector, strong cable shielding, and a durable USB plug. A well-built adapter lasts longer and gives me a more stable connection. If I plan to use it often, I choose one with a thicker cable and solid strain relief.

Data Transfer Reliability

I pay close attention to how reliably the adapter transfers data. For me, stable communication is more important than just being cheap. If I am using it for printers, industrial equipment, or older networking devices, I want an adapter that keeps the connection steady without random dropouts.

Driver Support and Ease of Setup

I prefer adapters with good driver support and clear installation instructions. Some of the best ones work right away, while others need manual driver installation. I usually read reviews to see whether other users had problems getting the adapter recognized by their system.

Length and Port Access

I also think about cable length. A short adapter is fine when my ports are close together, but a longer cable gives me more flexibility. I choose the length based on how far my device sits from my computer and whether I need easier access to the serial port.

Use Case Matters

I choose my adapter based on what I am connecting. If I need it for a simple console cable, I focus on compatibility and reliability. If I am using it for industrial or legacy equipment, I look for stronger performance and better shielding. My use case always helps me narrow down the right option.

Price vs Value

I do not always buy the cheapest adapter. In my experience, a slightly more expensive model often saves me time and frustration. I look for the best balance between price, durability, and performance. A good value adapter is one that works properly and lasts.

My Final Buying Tip

Before I buy, I always double-check the port type, operating system support, driver requirements, and build quality. That simple checklist helps me avoid compatibility problems and makes sure I get an adapter that actually works for my setup.

Final Thoughts

I’ve found that using a Comm Port to USB adapter is one of the simplest ways to keep older devices working with modern computers. My main takeaway is that the right adapter can save time, reduce compatibility issues, and extend the life of valuable equipment. I always recommend checking device requirements carefully so I can choose a reliable option that fits my setup.

Author Profile

Grant Mercer

I started Siemer Summit because my scattered notes about products I use needed somewhere better to live. The site became a place for honest, first-person product opinions based on things I have used, tested, compared, or researched because of real everyday needs.

I am interested in the products that sit between work, home, travel, and normal life. The things people buy because they want less clutter, fewer headaches, better comfort, or a small upgrade that actually earns its place. I am not here to make every item sound life-changing. Most products are not life-changing. Some are just good enough to make Tuesday less irritating, and honestly, that counts.

What you will find here is a careful look at whether something is worth buying, keeping, replacing, or avoiding. I pay attention to the parts people usually notice too late: awkward sizing, weak materials, bad layout, confusing setup, uncomfortable handles, short battery life, and features that sound impressive until you actually try to use them.

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