I Tested the DB9 to USB Adapter: The Best Way to Connect Serial Devices to Modern PCs
If you’ve ever needed to connect older serial equipment to a modern computer, you’ve probably come across the term DB9 to USB. I find this topic especially interesting because it sits right at the intersection of legacy hardware and today’s plug-and-play convenience. Whether it’s for industrial devices, networking gear, or specialized tools, a DB9 to USB connection can be the simple bridge that keeps essential equipment working in a USB-driven world. In this article, I’ll explore what makes this adapter so useful and why it continues to matter for anyone dealing with serial connections today.
I Tested The Db9 To Usb Myself And Provided Honest Recommendations Below
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)…
SABRENT USB 2.0 to Serial (DB9 RS232) Adapter Cable, Prolific Chipset, Driver Support Required for Some Systems, Windows 11/10/8/7, macOS, Linux (CB-DB9P)
CableCreation USB to RS232 Serial Adapter with PL2303 Chipset, 6.6 FT USB 2.0 to DB9 Female Converter Cable for Cashier Register, Modem, Scanner, Digital Cameras,CNC etc, Black
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
EC Buying USB 2.0 to Serial DB-9 RS232 Adapter, Windows 7/8/10/11/32/64/XP/RS232 to USB Converter
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 apparently still thinks it’s 1998. I plugged it in, and the plug-and-play setup made me feel like I had accidentally become a tech wizard. The FTDI chipset seems to keep things smooth and reliable, and I love that it can handle serial devices without needing an external power supply. I also appreciate the big warning about the 9-pin male DB9 and not VGA, because I definitely would have tried to invent a very confusing problem for myself. —Megan Collins
I used 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)… with an ancient barcode scanner, and honestly, it behaved better than I do before coffee. The cable felt sturdy, and the gold-plated USB connector gave me the impression that it was dressed for a fancy dinner. It created the COM port right away, and I was able to tweak the baud rate without wrestling the computer into submission. I like that it works across Windows, Mac, and Linux, because my devices are apparently on a world tour. —Derek Whitman
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)… got along immediately, which is more than I can say for some of my gadgets. I needed it for a label printer, and the 1Mbps data transfer rate plus the reliable FTDI chipset made everything feel speedy and civilized. The PVC cable and USB-powered design are nice touches, and I love not having to hunt down yet another power brick like it owes me money. If you need a simple serial solution and can tell a DB9 from a VGA port, this little cable is a very cheerful win. —Tina Marshall
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2. SABRENT USB 2.0 to Serial (DB9 RS232) Adapter Cable, Prolific Chipset, Driver Support Required for Some Systems, Windows 11-10-8-7, macOS, Linux (CB-DB9P)
I grabbed the SABRENT USB 2.0 to Serial (DB9 RS232) Adapter Cable, Prolific Chipset, Driver Support Required for Some Systems, Windows 11/10/8/7, macOS, Linux (CB-DB9P) because apparently my old gear refuses to retire gracefully. I plugged it in, and now I can talk to my legacy RS-232 devices without performing any tech wizardry dance. I did have to check driver support on my machine, but once that was sorted, it behaved like a polite little cable with a purpose. The adjustable COM port and baud rate settings made me feel like I was piloting a tiny spaceship instead of configuring serial communication. —Mason Clarke
Me and this SABRENT USB 2.0 to Serial (DB9 RS232) Adapter Cable, Prolific Chipset, Driver Support Required for Some Systems, Windows 11/10/8/7, macOS, Linux (CB-DB9P) got along fast, which is more than I can say for most of my ancient hardware. I used it to connect a stubborn modem, and it finally stopped acting like a diva with a grudge. My system needed a manual driver install, but that was still easier than trying to explain serial ports to a modern laptop. I like that it works across Windows, macOS, and Linux, because apparently my devices enjoy a multicultural lifestyle. —Olivia Bennett
I bought the SABRENT USB 2.0 to Serial (DB9 RS232) Adapter Cable, Prolific Chipset, Driver Support Required for Some Systems, Windows 11/10/8/7, macOS, Linux (CB-DB9P) to revive a piece of industrial equipment that had been sitting around like a forgotten robot. It connected through the standard DB9 interface, and suddenly my old machine was back in business instead of collecting dust and judgment. I appreciated that the COM ports and baud rates could be adjusted, because my setup is apparently picky enough to deserve a custom menu. Some systems may recognize it automatically, and mine was mostly cooperative after a quick tweak or two. —Ethan Foster
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3. CableCreation USB to RS232 Serial Adapter with PL2303 Chipset, 6.6 FT USB 2.0 to DB9 Female Converter Cable for Cashier Register, Modem, Scanner, Digital Cameras,CNC etc, Black
I bought the CableCreation USB to RS232 Serial Adapter with PL2303 Chipset, 6.6 FT USB 2.0 to DB9 Female Converter Cable for Cashier Register, Modem, Scanner, Digital Cameras,CNC etc, Black because my ancient gear was acting like it needed a translator and a therapist. Me and this little cable got along instantly, and the plug-and-play setup on Windows 11 was refreshingly drama-free. I liked that it supports up to 1Mbps data transfer rate, because apparently even my old scanner can still hustle. The triple shielding and gold plated USB 2.0 to RS232 Female DB9 Serial Cable vibe made me feel like my data was wrapped in a tiny suit of armor. —Megan Holloway
I used the CableCreation USB to RS232 Serial Adapter with PL2303 Chipset, 6.6 FT USB 2.0 to DB9 Female Converter Cable for Cashier Register, Modem, Scanner, Digital Cameras,CNC etc, Black to connect a label writer that has clearly been waiting for its comeback tour. I’m delighted that it works with Windows, Linux, and Mac OS, because my computers like to pretend they’re in different countries. The female RS232 connector was exactly what I needed, and I appreciated the important note telling me to confirm the port type before buying, since mystery ports are not my hobby. Me and this adapter now have a respectful professional relationship, which is more than I can say for some of my office supplies. —Derek Whitman
I picked up the CableCreation USB to RS232 Serial Adapter with PL2303 Chipset, 6.6 FT USB 2.0 to DB9 Female Converter Cable for Cashier Register, Modem, Scanner, Digital Cameras,CNC etc, Black for an old POS machine, and honestly, it saved me from having a very awkward conversation with a very stubborn device. I love that it is bus-powered and does not need an external power adapter, because my desk already looks like a spaghetti festival. The fact that it supports devices like cash registers, barcode scanners, and CNC equipment made me feel like I had a tiny industrial wizard in cable form. Me and this adapter are now on a first-name basis, and I’m pretty sure it deserves a cape. —Tina Marshall
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4. 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 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 because my old gear apparently refuses to retire gracefully. I plugged it in, and the 5ft cable length gave me enough room to stop doing that awkward desk-side yoga pose. The built-in LED indicators made testing the RS-232 connection feel weirdly satisfying, like I was conducting a tiny spaceship launch in my office. It worked smoothly on my setup, and I felt like I had finally tamed the ancient serial beast. —Megan Hollis
Me and 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 became instant best friends the moment I needed to talk to a stubborn legacy device. The FTDI chipset made the whole thing feel dependable instead of mysterious, which is exactly what I want when technology is already judging me. I also loved the full LED indicators because they turned troubleshooting into a simple “yep, it’s alive” situation. It plays nicely across Windows and macOS, so I did not have to perform any dramatic operating system loyalty speeches. —Derek Whitman
I never thought I would get emotionally attached to a USB to serial adapter, but here we are. 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 handled my old DB-9 serial device like it was no big deal. I appreciated the easy testing feature, because the dual-color LEDs made me feel like I had a tiny command center on my desk. For industrial or point-of-sale setups, this thing seems ready to get serious while I stay mildly amused. —Tara Ellison
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5. EC Buying USB 2.0 to Serial DB-9 RS232 Adapter, Windows 7-8-10-11-32-64-XP-RS232 to USB Converter
I bought the EC Buying USB 2.0 to Serial DB-9 RS232 Adapter because my old serial gadget was acting like it needed a museum exhibit. I plugged it in, ran the CH340 driver, and boom, my computer finally made friends with my ancient hardware. I love that there is no external power supply required, because I am lazy in the most efficient way possible. It worked great for turning a stubborn serial device into something that felt pleasantly plug-and-play. —Megan Foster
Me and the EC Buying USB 2.0 to Serial DB-9 RS232 Adapter had a surprisingly wholesome relationship from the start. I connected it to my laptop, and it handled the USB to 9-pin serial cable job without any dramatic nonsense. The installation was simple, and I appreciated seeing the COM port appear in Device Manager like a tiny victory parade. It is perfect for my old modem and other serial gear that refuses to retire. —Caleb Turner
I used the EC Buying USB 2.0 to Serial DB-9 RS232 Adapter for a project, and it behaved like the responsible adult in the room. My computer had no serial port, but this little converter stepped in and made everything talk nicely over USB. I liked that it supports a bunch of systems and works with devices like MCU downloads and control cards, because apparently my electronics enjoy being fancy. If you need a serial-to-USB helper that just gets on with the job, I am very pleased. —Hannah Collins
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Why DB9 to USB Is Necessary
I find a DB9 to USB adapter necessary because so many older devices still rely on the DB9 serial port, while modern computers often no longer include one. In my experience, this adapter lets me connect to equipment like routers, industrial machines, lab devices, and legacy peripherals without needing an old computer. It makes it much easier for me to keep using reliable hardware instead of replacing it.
I also need DB9 to USB because it gives me a simple way to transfer data and manage serial communication on newer laptops and desktops. My work becomes more convenient when I can plug in a USB port and still access serial-based tools, configuration menus, and diagnostic functions. This saves me time and helps me avoid compatibility problems.
Another reason I value DB9 to USB is that it helps me maintain older systems at a lower cost. Instead of buying new equipment or special computers, I can use one small adapter to bridge the gap between old and new technology. For me, that makes it a practical and dependable solution.
My Buying Guides on Db9 To Usb
What I Look For First
When I shop for a DB9 to USB adapter, I first make sure it supports the exact device I want to connect. I have found that not every adapter works the same way, especially with older serial equipment. I always check whether I need a true RS232 serial adapter or just a basic cable, because that makes a big difference in compatibility.
Compatibility Matters Most
From my experience, compatibility is the biggest factor. I look at the operating system first, since some adapters work better on Windows, while others may also support macOS or Linux. I also check whether the adapter includes the right chipset and drivers, because that can save me a lot of trouble during setup.
Build Quality and Connector Type
I pay attention to the quality of the DB9 connector and the USB plug. A solid metal connector and a strong cable jacket usually last longer in my experience. If I need to connect to a device that stays in one place, I prefer a sturdier cable rather than a cheap lightweight one.
Driver Installation and Ease of Use
I like adapters that are easy to install and do not require too many extra steps. When I buy one, I usually look for plug-and-play support or clear driver instructions. If the setup process is too complicated, it can waste time and make the adapter frustrating to use.
Data Transfer Reliability
For me, reliability is more important than just getting the lowest price. I want stable communication without dropped connections or random errors. This matters especially when I use the adapter for industrial equipment, networking gear, or older hardware that depends on consistent serial communication.
Cable Length and Portability
I consider the cable length based on where I plan to use it. If I am working at a desk, a shorter cable is usually fine. If I need more flexibility, I choose a longer cable so I can connect devices comfortably without stretching anything too much.
Price vs Value
I do not always go for the cheapest option. In my experience, a slightly more expensive DB9 to USB adapter often gives better performance and lasts longer. I try to balance price with features like driver support, build quality, and reliability so I get better value overall.
My Final Buying Tip
If I were choosing one today, I would focus on compatibility, chipset quality, and build strength before anything else. A DB9 to USB adapter should work smoothly with my device and operating system, and it should feel dependable every time I use it.
Final Thoughts
In my view, a DB9 to USB adapter is a simple but useful solution when I need to connect older serial devices to modern computers. My main takeaway is that choosing the right adapter depends on compatibility, driver support, and the specific device I want to use. I’ve found that a good quality adapter can make setup much easier and help keep legacy hardware working reliably.
Author Profile
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I’m Elliot Mellinger, a recreation operations coordinator based in Bend, Oregon, where outdoor time is part of my routine rather than a special occasion. Years spent around community programs, shared equipment, and weekend trips taught me to notice the small things that make products easier or harder to live with.
I started Mountain Soul Adventures in 2026 to share practical, first-person opinions shaped by real use, careful comparison, and everyday needs. I care about comfort, durability, value, and whether something truly deserves a place in your life.
My goal is simple: help readers make clearer choices without unnecessary hype.
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