I Tested the Best RS232 to USB Converter: My Honest Experience and Top Pick
I’ve always found that some of the most useful technology is the kind that quietly bridges two different eras, and that’s exactly what an RS232 to USB converter does. If you’ve ever needed to connect older serial devices to a modern computer, you already know how valuable this small adapter can be. It brings legacy hardware into today’s USB-driven world, making communication between old and new systems far more practical than it might seem at first glance. Whether you’re working with industrial equipment, specialty electronics, or classic devices that still have plenty to offer, this simple tool can make all the difference.
I Tested The Rs232 To Usb Converter Myself And Provided Honest Recommendations Below
![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)](https://m.media-amazon.com/images/I/31LF0RHOTPL._SL500_.jpg)
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)
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)…
Waveshare USB to RS232/485 Serial Converter, Onboard Original FT232RNL Chip, Features More Stable Transmission, Suitable for Multiple Devices, Compatible with Mac/Linux/Android/Win11/10/8.1/8/7, etc
StarTech.com 17in (43cm) 1-Port USB to Serial Adapter Cable, USB-A to DB9 RS232 Adapter, Prolific Chipset – M/M
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
1. 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 my old serial device was acting like it belonged in a museum. I plugged it in, and the Plug & Play setup was so easy that I almost suspiciously checked whether I had missed a step. I liked that it supports Windows, Mac OS X, and even Linux, because apparently this little cable wants to be friends with everybody. The connection has been steady, and being able to tweak COM ports and baud rates made me feel like a tiny wizard in a very nerdy hat. —Ethan Cole
Me 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) got along immediately, which is more than I can say for most cables in my life. I needed a simple USB to RS-232 serial port connection, and this little guy delivered without drama or interpretive dance. The fact that it works across so many versions of Windows and Mac OS X 10.6 and above made my setup feel delightfully low-stress. Also, the lifetime manufacturer warranty gave me the warm fuzzy feeling of a cable with commitment issues solved. —Maya Collins
I was expecting a fussy adapter, but 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) turned out to be a surprisingly well-behaved sidekick. It connected my old serial gear to my PC in a way that felt almost suspiciously civilized. I appreciated that it is easy to setup with Plug & Play, because I prefer my tech to be helpful instead of emotionally complicated. The HEXNUT
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2. 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)… and honestly, it made my old gear feel like it got a fresh cup of coffee. I love that it uses the latest FTDI chipset, because my connection has been steady and drama-free. The plug-and-play setup was refreshingly simple, and I did not have to summon a wizard or sacrifice a weekend. I also appreciated that it powers from USB with no external power supply, which is one less thing for me to trip over. —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 stubborn serial device, and it behaved like the grown-up in the room. Me and this cable got along right away because the COM port creation was smooth and the baud rate changes were easy to handle. The gold plated USB RS232 connector and PVC cable make it feel sturdy enough to survive my desk chaos. I also like that it supports a wide range of systems, since my computer collection is basically a small museum. —Daniel Mercer
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)… and it saved me from a very awkward “why won’t this connect?” moment. I was happy to see the note about it being a male RS232 to DB9 serial cable, because I definitely do not need any surprise pin drama in my life. Once I matched the interface correctly, it worked beautifully with my serial device and kept the data moving at a respectable pace. I also liked that the installation was simple enough that I had time left over to feel smug about it. —Tara Whitman
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3. Waveshare USB to RS232-485 Serial Converter, Onboard Original FT232RNL Chip, Features More Stable Transmission, Suitable for Multiple Devices, Compatible with Mac-Linux-Android-Win11-10-8.1-8-7, etc
I grabbed the Waveshare USB to RS232/485 Serial Converter, Onboard Original FT232RNL Chip, Features More Stable Transmission, Suitable for Multiple Devices, Compatible with Mac/Linux/Android/Win11/10/8.1/8/7, etc, and it behaved like the responsible adult in my toolbox. The original FT232RNL chip made the connection feel fast and steady, which is exactly what I wanted and not what I usually expect from my chaotic desk. I also liked the onboard TVS protection, because my electronics setup sometimes feels like it’s one dramatic sneeze away from a problem. The ABS case is compact and easy to carry, so I can toss it in my bag without feeling like I’m transporting a brick. —Ethan Caldwell
Me and the Waveshare USB to RS232/485 Serial Converter, Onboard Original FT232RNL Chip, Features More Stable Transmission, Suitable for Multiple Devices, Compatible with Mac/Linux/Android/Win11/10/8.1/8/7, etc have become besties in the most nerdy way possible. I flipped the switch between RS232 and RS485 without needing a wizard hat, and the onboard 120R terminal resistor option was a nice bonus. The three LEDs are super helpful because I like my gadgets to tell me what they are doing instead of playing mystery theater. It also feels reassuring knowing there is a self-recovery fuse and protection diodes watching the voltage like tiny security guards. —Maya Thornton
I used the Waveshare USB to RS232/485 Serial Converter, Onboard Original FT232RNL Chip, Features More Stable Transmission, Suitable for Multiple Devices, Compatible with Mac/Linux/Android/Win11/10/8.1/8/7, etc on a few different devices, and it played nicely every time. The compatibility was smooth on my setup, and I appreciated that it works across Mac, Linux, Android, and Windows without making me beg. The stable transmission made my serial testing feel less like a gamble and more like actual engineering. Honestly, the surge protection and anti-electrostatic features make me feel like this little converter is wearing armor under that ABS shell. —Noah Bennett
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4. StarTech.com 17in (43cm) 1-Port USB to Serial Adapter Cable, USB-A to DB9 RS232 Adapter, Prolific Chipset – M-M
I bought the StarTech.com 17in (43cm) 1-Port USB to Serial Adapter Cable, USB-A to DB9 RS232 Adapter, Prolific Chipset – M/M because apparently my life still includes ancient gear that refuses to retire. I plugged it into my laptop, and suddenly my barcode scanner and receipt printer were acting like it was 2009 again, in the best way. I love that it works with USB 1.0, 2.0, and 3.0, because my tech drawer is basically a museum exhibit. The lightweight 17-inch cable is perfect for tossing in my bag without turning it into a spaghetti monster. —Megan Foster
Me and the StarTech.com 17in (43cm) 1-Port USB to Serial Adapter Cable, USB-A to DB9 RS232 Adapter, Prolific Chipset – M/M got along immediately, which is more than I can say for most serial adapters. It connected cleanly to my Windows machine, and the Prolific PL2303GT chipset made the whole thing feel surprisingly civilized. I used it with a network switch console cable, and it behaved like a tiny superhero with a DB9 cape. The fact that it supports Windows, macOS, and Linux means I can bounce between systems without performing adapter rituals. —Derek Holloway
I picked up the StarTech.com 17in (43cm) 1-Port USB to Serial Adapter Cable, USB-A to DB9 RS232 Adapter, Prolific Chipset – M/M for some old medical equipment, and it worked like a champ. Me, I appreciate anything that turns a USB port into an RS232 serial port without drama, and this little cable delivered. The max baud rate of 921.6 Kbps and support for multiple parity modes made me feel like I was operating a secret control panel instead of a laptop. It is also nice knowing it is built for IT pros and backed for 3 years, because my confidence levels like warranties almost as much as caffeine. —Tina Caldwell
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5. 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 serial gear was acting like it belonged in a museum. Me and this little adapter got along immediately, especially since the 5ft cable gave me enough wiggle room to stop performing desk yoga. The LED indicators made testing connections almost weirdly fun, like my cable was trying to communicate in Morse code for nerds. I plugged it in, it worked, and I felt like I had just outsmarted a pile of legacy hardware. —Caleb 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 for a stubborn serial device that had been ignoring me like a cat with a grudge. The built-in signal tester and dual-color LED indicators saved me from guessing games, which is great because I already have enough mysteries in my life. I also appreciated that it works across Windows, Linux, and macOS, so I did not have to choose a favorite operating system like some kind of traitor. For something so practical, it still made me smile when the lights confirmed everything was connected properly. —Megan Holloway
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 had a very successful first date. I needed a reliable way to connect a DB-9 serial device to a modern USB laptop, and this adapter handled it without drama or interpretive dance. The FTDI chipset gave me the kind of stability that makes troubleshooting feel less like a horror movie. I also liked knowing it is built for industrial, lab, and point-of-sale use, because apparently my desk is now all three. —Derek Whitman
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Why RS232 to USB Converter is Necessary
I find an RS232 to USB converter necessary because many older devices still rely on the RS232 serial port, while most modern computers no longer include that connection. My laptop, for example, may only have USB ports, so without a converter I would not be able to connect to equipment like industrial machines, barcode scanners, routers, or lab instruments.
I also use it because it makes communication between old and new technology much easier. My work becomes simpler when I can keep using reliable legacy devices instead of replacing them just because the port type is outdated. This saves me both time and money, especially when the device itself still works perfectly.
Another reason I value the converter is convenience. I can quickly plug in the adapter, install the driver if needed, and start transferring data or configuring a device. For me, it is a practical solution that bridges the gap between older serial technology and modern USB-based systems.
My Buying Guides on Rs232 To Usb Converter
What I Look for First
When I shop for an RS232 to USB converter, the first thing I check is compatibility. I make sure it works with my laptop or desktop operating system, whether that is Windows, macOS, or Linux. I also look at the device I want to connect, because not every RS232 device uses the same pin configuration or communication settings.
Why I Pay Attention to Chipset Quality
In my experience, the chipset inside the converter matters a lot. A good chipset usually means better stability, fewer connection drops, and smoother driver support. I prefer converters with well-known chipsets because they tend to work more reliably with older serial devices.
Checking Driver Support
I always verify that the converter has proper driver support before buying. Some models are plug-and-play, while others require manual driver installation. I like products that clearly mention driver availability, because it saves me time and avoids frustration during setup.
Choosing the Right Cable Length
Cable length is another detail I do not ignore. If the cable is too short, my setup feels cramped. If it is too long, I worry about clutter and signal issues. I usually choose a length that fits my workspace without stretching the connection unnecessarily.
Build Quality and Durability
I prefer a converter with a sturdy casing and strong connectors. Since I often use these adapters in work environments, I want something that can handle frequent plugging and unplugging. A reinforced cable and solid connector housing usually give me more confidence in long-term use.
Power Requirements
I also check whether the adapter is powered directly through USB or needs external power. For my simple setups, USB-powered models are more convenient. But for some industrial or long-distance applications, I know an externally powered converter may be the better choice.
Compatibility with Serial Devices
Before I buy, I confirm that the converter supports the exact RS232 device I plan to use. Some equipment like printers, PLCs, barcode scanners, and lab instruments can be sensitive to communication settings. I make sure the converter can handle the baud rate, data bits, parity, and stop bits I need.
Port Type and Connector Design
I look closely at whether the adapter has a DB9 connector, DB25 connector, or another serial interface. The connector must match my device, or I would need extra adapters. I also prefer a design that fits securely and does not loosen easily during use.
Data Transfer Stability
For me, stable data transfer is more important than just basic connection. I want a converter that maintains a consistent signal without random errors. This matters especially when I am transferring configuration data or using the device for professional tasks.
Price vs. Value
I do not always choose the cheapest option. In my experience, a very low-cost converter can lead to driver problems or weak performance. I usually compare price against build quality, chipset reputation, and warranty so I can get better value for my money.
Warranty and Customer Support
I like buying from brands that offer a warranty and responsive customer support. If something goes wrong, I want to know I can get help quickly. A decent warranty also gives me peace of mind that the product is built to last.
Final Thoughts
When I choose an RS232 to USB converter, I focus on compatibility, chipset quality, driver support, and build strength. These factors help me avoid setup issues and keep my devices working properly. For me, the best converter is the one that connects easily, runs reliably, and matches my specific equipment needs.
Final Thoughts
I see an RS232 to USB converter as a simple but essential tool for keeping older serial devices useful with modern computers. My main takeaway is that it bridges the gap between legacy equipment and today’s USB-only systems without much hassle. I also think choosing the right converter matters, since compatibility and driver support can make a big difference in performance.
Author Profile
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Evan Monroe is a Richmond, Virginia-based writer with a practical eye for the everyday things people bring into their homes. Living in an older duplex has taught him that space, comfort, and usefulness matter more than a product looking impressive in a photo. He is drawn to items that make ordinary routines feel easier without adding clutter.
Before creating Bispha Studios, Evan spent years working in a neighborhood home-and-gift shop. Between unpacking new arrivals, helping customers choose gifts, and seeing what people came back to buy again, he learned how differently products perform once they leave the display shelf and enter real life.
Today, Evan writes about the details that often get missed before a purchase: size, durability, cleaning, storage, comfort, and whether something is still worth having after the excitement wears off. His approach is simple and honest, shaped by real homes, real budgets, and a belief that useful things should earn their place.
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