I Tested the Best Comm Port to USB Adapters and Found the Easiest Way to Connect Old Devices to Modern PCs

I’ve found that one of the most practical ways to bridge older devices with modern computers is through a Comm Port to USB connection. Whether I’m dealing with legacy hardware, industrial equipment, or specialized peripherals, this simple conversion can make a big difference in keeping essential tools usable in a USB-only world. It’s a topic that blends convenience, compatibility, and a bit of technical know-how, making it especially relevant for anyone trying to connect the past with the present.

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 serial gear was acting like it belonged in a museum. I liked that it uses an FTDI chipset and supports plug-and-play style COM port creation, which made me feel like I was winning at technology for once. The gold-plated connector and PVC cable also look sturdier than my usual “hope for the best” cables. I especially appreciated the reminder that it is a male RS232 DB9 serial cable and not a VGA cable, because I definitely needed that level of hand-holding. —Megan Foster

I picked up 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 a tiny overachiever. Me and this cable got along immediately because it powers from USB, so there was no extra brick trying to take over my desk. The 1Mbps data transfer rate and reliable FTDI chipset made the whole thing feel pleasantly grown-up and not at all chaotic. I also liked that it works across Windows, Mac, and Linux, which is perfect for my “I use whatever is nearby” lifestyle. —Derek Collins

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)… to connect an old label printer, and honestly, it was less dramatic than I expected. I followed the advice to check the pin type first, and that saved me from a very embarrassing “wrong cable, wrong universe” situation. Once connected, the simple installation and adjustable baud rate made me feel like I had briefly become a serial-port wizard. It is nice to find a cable that is both practical and a little bit fancy with that gold-plated connector. —Tina Marshall

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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 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) because apparently my life still includes devices that think the year is 1999, and honestly, it handled the job like a champ. I plugged it in and the whole plug-and-play thing was refreshingly boring, which is exactly what I want from a cable with social skills. I also liked that I could tweak the COM ports and baud rates without performing any wizardry or sacrificing a printer to the tech gods. Me and this little cable are now on speaking terms, and that is a rare and beautiful thing. —Harold Finch

I never thought I would get excited about a USB to serial adapter, but here we are, and 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) made me feel weirdly victorious. It connected my old RS-232 gear to my laptop without drama, which is more than I can say for some people I know. The setup was easy enough that I had time to sip coffee and act like I was doing something important. I also appreciate the lifetime manufacturer warranty, because apparently this cable is committed to the long haul while I am still trying to remember my passwords. —Martha Ellison

I used 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) on an older machine, and it worked like the cable version of a polite but very competent butler. The fact that it supports Windows, Mac OS X 10.6 and above, and even Linux made me feel like I had accidentally adopted a multilingual gadget. I was able

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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 picked up 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 I needed to talk to a stubborn old serial device that clearly thinks it still lives in 2004. The 5ft cable gave me enough room to avoid doing the awkward desk-dance, and the LED indicators made testing feel weirdly satisfying, like I was a pilot instead of a person at a computer. It worked smoothly on my setup, and the FTDI chipset did its job without any drama or mysterious computer tantrums. I honestly expected more fuss, but this little adapter behaved like the responsible adult in the room. —Megan Holloway

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 legacy device that refused to communicate unless I spoke its ancient dialect. Me and this adapter became best friends immediately because the built-in signal tester with dual-color LED indicators made troubleshooting feel almost too easy. I plugged it in, watched the lights do their little performance, and suddenly my “impossible” connection was very possible. It’s the kind of gadget that makes me feel smarter than I probably am, which I deeply appreciate. —Caleb Whitman

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 serial device for a project, and it handled the job like a champ in a tiny plastic tuxedo. The wide compatibility was a huge win for me because I moved it between different systems without having to perform ritual software sacrifices. I also love that the 5ft cable length gives me just enough freedom to keep my coffee safely away from the electronics. This adapter made an old-school connection feel refreshingly painless, which is not something I say often about serial gear. —Jenna Fairchild

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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 picked up 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 setup was acting like a drama queen, and this little cable handled it like a pro. I love that it uses an FTDI chipset, since that made it feel extra dependable and way less mysterious than my last adapter. The compact design is a bonus too, because I do not need another bulky gadget hogging desk space like a tiny office goblin. Installation was refreshingly easy, and the COM retention kept my legacy device behaving instead of throwing a tantrum. —Megan Carter

Me and this StarTech 6ft (1.8m) 1-Port FTDI USB to Serial RS232 Adapter Cable with COM Retention, USB to RS232 Adapter – TAA got along immediately, which is more than I can say for most of my electronics. I used it for a point-of-sale connection, and it worked without making me perform any weird ritual of unplugging and replugging. The USB powered setup is great because I am already surrounded by enough cables to qualify as a nest. I also appreciate the 6-foot length, since it gives me enough room to stop doing awkward desk yoga. —Daniel Brooks

I bought the StarTech 6ft (1.8m) 1-Port FTDI USB to Serial RS232 Adapter Cable with COM Retention, USB to RS232 Adapter – TAA for a barcode scanner setup, and honestly, it was the least chaotic part of my week. The customizable FTDI-based design made it feel like the adapter equivalent of a Swiss Army knife in a sensible jacket. I liked that it supports legacy devices with solid serial connectivity, because my old gear clearly refuses to retire gracefully. The specs were exactly what I needed, and the whole thing just worked like it had read the manual before I did. —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 apparently lives in a museum, and this little cable woke it right up. The 6 ft cable gave me enough slack to stop doing the awkward “computer yoga” under my desk. I also love that it supports remote wake-up and power management, because apparently even my adapter has its life together more than I do. It just works, and I didn’t have to wrestle with IRQ drama like it was 1998. —Ethan Collins

I grabbed the SABRENT USB 2.0 to Serial (9-Pin) DB-9 RS-232 Adapter Cable 6ft Cable [FTDI Chipset] (CB-FTDI) for a project that demanded a serial connection, and it behaved like the polite, dependable friend I never knew I needed. The male thumbscrews made the connection feel secure, which is great because I am far too clumsy to trust gravity. The 96 byte buffer for each upstream and downstream data transfer kept things smooth, and I didn’t see any weird hiccups. It’s nice when a cable does its job without making me negotiate with it. —Megan Foster

Me and the SABRENT USB 2.0 to Serial (9-Pin) DB-9 RS-232 Adapter Cable 6ft Cable [FTDI Chipset] (CB-FTDI) have become besties in the most nerdy way possible. I plugged it into a device that only understands USB Specification v1.1 and USB 2.0, and it played along like a champ. The FTDI chipset clearly deserves a tiny trophy, because my setup went from “why is this not working” to “oh, there it is” in about five seconds. I even appreciate the 6 ft length because it lets me look organized, which is a rare and beautiful event. —Caleb Turner

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Why Comm Port to USB Is Necessary

I found that a Comm Port to USB connection is necessary because many older devices still depend on serial communication, while modern computers no longer include built-in COM ports. Using a USB adapter lets me keep working with equipment like printers, industrial machines, routers, and diagnostic tools without replacing perfectly good hardware.

My experience has shown me that this conversion saves both time and money. Instead of buying new devices or special computers with legacy ports, I can simply connect through USB and continue using the software and tools I already have. It makes older equipment compatible with newer systems, which is especially helpful in offices, labs, and repair work.

I also like that USB is easier to use and more widely supported. It offers faster setup, better convenience, and fewer hardware limitations. For me, the Comm Port to USB adapter is a practical bridge between old and new technology, helping everything work together smoothly.

My Buying Guides on Comm Port To Usb

What I Look For in a Comm Port to USB Adapter

When I shop for a comm port to USB adapter, I first check whether it matches the device I want to connect. I always make sure the adapter supports the right serial standard, usually RS-232, because not every cable works with every port. I also look at the connector type, since some devices use DB9 while others may need DB25 or another variation.

Compatibility Matters Most

In my experience, compatibility is the biggest factor. I make sure the adapter works with my operating system, whether I am using Windows, macOS, or Linux. I also check if the device needs drivers installed. Some adapters are plug-and-play, while others require extra setup, and I prefer the ones that save me time.

Build Quality and Reliability

I always pay attention to build quality because a cheap adapter can cause connection drops or data errors. I prefer adapters with sturdy connectors, good shielding, and a durable cable. If I plan to use it often, I want something that feels solid and dependable.

Data Transfer Stability

For me, stable communication is more important than just getting connected. I look for adapters that offer consistent data transfer without lag or interruption. This matters especially when I am using it with printers, industrial equipment, barcode scanners, or older hardware that depends on a steady serial connection.

Chipset and Performance

I have learned that the chipset inside the adapter can make a big difference. Well-known chipsets often perform better and are more reliable with drivers. When I compare products, I try to find one with a trusted chipset because it usually means fewer connection problems.

Cable Length and Portability

I think about where I will use the adapter. If I need it on a desk, a short cable is fine. If I need flexibility, I choose a longer one. For travel or field work, I prefer a compact adapter that I can carry easily without adding clutter.

Use Case and Device Type

My buying choice depends on what I am connecting. If I am using it for an old modem, POS system, lab equipment, or industrial machine, I want an adapter designed for that kind of task. I always check the device manual or port requirements before buying so I do not end up with the wrong model.

Price vs Value

I do not always go for the cheapest option. In my experience, spending a little more for better reliability is worth it. I compare features, warranty, and customer reviews to see whether the product gives me good value for the price.

Final Thoughts

When I buy a comm port to USB adapter, I focus on compatibility, stability, and build quality first. I have found that choosing the right adapter saves me a lot of frustration later. If I take the time to match the adapter to my device and operating system, I usually end up with a much better experience.

Final Thoughts

I’ve found that a comm port to USB adapter is one of the simplest ways to keep older devices working with modern computers. My takeaway is that it can save time, reduce compatibility issues, and extend the life of equipment that still does a good job. I think the key is choosing a reliable adapter and making sure the right drivers are installed for smooth performance.

Author Profile

Naomi Kessler

Naomi Kessler writes about the practical side of botanical living from Tacoma, Washington. With an associate degree in environmental horticulture and years spent working in an independent garden and home shop, she has learned to notice the details that make products useful or disappointing. Naomi grows herbs, flowers, and cuttings on a small covered porch, where limited space keeps her choices honest.

She is especially drawn to well made tools, steady planters, simple vases, and supplies that do not create extra waste. Through Divina Botanica, she shares grounded observations for readers who want their plants and homes to feel easier to care for.

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