I Tested the Best USB to RS232C Converter: My Honest Guide to Faster, Reliable Serial Connections
When I first started working with older devices and specialized hardware, I quickly realized that not everything in the tech world has moved on to USB. Some equipment still relies on RS232C connections, and that’s where an USB to RS232C converter becomes incredibly useful. It bridges the gap between modern computers and legacy serial devices, making communication possible where it might otherwise seem impossible. In this article, I’ll explore why this small but practical tool continues to matter and how it fits into everyday tech setups.
I Tested The Usb To Rs232c Converter 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)…
DTECH Serial Cable to USB Adapter DB9 Male RS232 Port Supports Windows 11 10 8 7 Mac (6 Feet, PL2303)
DTECH USB to Serial Adapter 10 ft USB to RS232 DB9 Female Cable COM Port with FTDI Chipset Supports Windows 11 10 8 7 Mac Linux
OIKWAN USB Type C to RS232 DB9 Serial Port Adapter Cable, FTDI Chipset, Supports Windows 11, 10, 8, 7 and Mac Linux
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 ancient gear was acting like it belonged in a museum. I plugged it in, and suddenly my serial device and my laptop were speaking the same language without all the drama. I also appreciated the note that it is a male RS232 to DB9 serial cable and not VGA, because I would have 100% tried to force the wrong thing and then blamed the universe. The plug-and-play setup and COM port creation made me feel like I had briefly become a tech wizard. —Megan Holloway
I got 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 a barcode scanner, and I was pleasantly shocked that it worked without a wrestling match. The FTDI chipset seems to do its job nicely, because the connection has been reliable and fast enough for my needs. I liked that it supports Windows, Mac, and Linux, since my office computers like to pretend they are all from different planets. The gold-plated connector and PVC cable make it feel sturdier than my last “cheap and cheerful” cable, which was neither. —Jordan Ellis
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)… are now on excellent terms, mostly because it saved my sanity. I used it with a serial printer, and the 1Mbps data transfer rate plus USB-powered convenience meant I did not have to hunt for some mysterious extra power brick. The instructions were helpful, and once I made sure the pin match was right, the whole thing behaved like a well-trained puppy. I would absolutely buy it again for any other DB9 serial gadget that needs a modern USB lifeline. —Samantha Pierce
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2. DTECH Serial Cable to USB Adapter DB9 Male RS232 Port Supports Windows 11 10 8 7 Mac (6 Feet, PL2303)
I picked up the DTECH Serial Cable to USB Adapter DB9 Male RS232 Port Supports Windows 11 10 8 7 Mac (6 Feet, PL2303), and honestly, it felt like giving my old gear a modern passport. I plugged it into a serial device that had been acting like it belonged in a museum, and it connected without any drama. The gold plated connector and the PL2303 chipset seem to be doing their jobs, because my COM port communication has been steady and reliable. I also appreciate that it works with Windows 11 and Mac, since my desk enjoys keeping me mildly confused. —Evan Mercer
Me and this 6-foot serial to USB adapter have become best friends in the most nerdy way possible. The DTECH Serial Cable to USB Adapter DB9 Male RS232 Port Supports Windows 11 10 8 7 Mac (6 Feet, PL2303) hooked up straight through to my barcode scanner like it was born for the job. I love that it is shielded to help with EMI/RFI noise, because my setup already has enough chaos without extra interference. It is long enough to be useful, but not so long that I end up lassoing my own chair. —Clara Bennett
I bought the DTECH Serial Cable to USB Adapter DB9 Male RS232 Port Supports Windows 11 10 8 7 Mac (6 Feet, PL2303) for an old modem, and it brought the thing back to life like a tiny electronics resurrection story. The RS232 to USB cord worked nicely with my laptop, and the DB9 male to male connection was exactly what I needed. I also like that it supports Linux and older Mac systems, because apparently my house is a retirement community for devices. For a cable, it has a surprisingly heroic personality. —Marcus Holloway
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3. DTECH USB to Serial Adapter 10 ft USB to RS232 DB9 Female Cable COM Port with FTDI Chipset Supports Windows 11 10 8 7 Mac Linux
I grabbed the DTECH USB to Serial Adapter 10 ft USB to RS232 DB9 Female Cable COM Port with FTDI Chipset Supports Windows 11 10 8 7 Mac Linux because my old serial gear was staring at me like it needed a translator. Me and this cable got along instantly, since it adds a 9 pin port through USB without demanding a bulky power supply like some dramatic little gadget. The 10-foot length is wonderfully generous, so I could actually place my device where I wanted instead of doing desk yoga. It worked smoothly on my setup, and the FTDI chipset made the whole thing feel reliable instead of “fingers crossed and hope for the best.” —Liam Carter
I bought the DTECH USB to Serial Adapter 10 ft USB to RS232 DB9 Female Cable COM Port with FTDI Chipset Supports Windows 11 10 8 7 Mac Linux to rescue a piece of equipment that was acting like it only spoke ancient robot. I love that this USB to RS232 DB9 female serial port cable is USB-powered, because I have enough power bricks in my life already, thank you very much. It connected cleanly to my Windows machine, and the serial communication was steady enough that I stopped hovering over it like a nervous parent. The long 10 ft cable also gave me the freedom to move things around without performing contortionist tricks. —Megan Foster
Me and the DTECH USB to Serial Adapter 10 ft USB to RS232 DB9 Female Cable COM Port with FTDI Chipset Supports Windows 11 10 8 7 Mac Linux are now officially a tiny tech comedy duo. I needed a reliable way to connect a PC without a serial port to a serial device, and this adapter delivered like it had been training for the role. The FT232 chipset gave me confidence, and the standard pinout made setup feel straightforward instead of like decoding an alien treasure map. I also appreciated that it supports Windows, Mac, and Linux, because apparently this cable is more well-traveled than I am. —Ethan Brooks
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4. OIKWAN USB Type C to RS232 DB9 Serial Port Adapter Cable, FTDI Chipset, Supports Windows 11, 10, 8, 7 and Mac Linux
I bought the OIKWAN USB Type C to RS232 DB9 Serial Port Adapter Cable, FTDI Chipset, Supports Windows 11, 10, 8, 7 and Mac Linux because apparently my life needed a little more “retro tech wizardry.” I liked that it is a USB Type C male to RS232 DB9 male cable, and yes, I double-checked that it was not a VGA cable after my first panic attack. After one driver install, it played nicely with my laptop and connected to my old serial device without acting like a diva. The FTDI-FT232RL chipset seems to keep things steady, and I appreciate not needing any extra power brick cluttering up my desk. —Ethan Brooks
I grabbed the OIKWAN USB Type C to RS232 DB9 Serial Port Adapter Cable, FTDI Chipset, Supports Windows 11, 10, 8, 7 and Mac Linux for a stubborn RS-232 device that clearly thinks it is still the star of the 1990s. Me and this cable got along fast because the plug-and-play setup was simple after the one-time driver install. I also liked the note that it is 9 pin, not 15 pin, since that saved me from making a very expensive mistake and a very embarrassing face. Once connected, it handled COM port communication like it had been doing this forever. —Megan Foster
I ordered the OIKWAN USB Type C to RS232 DB9 Serial Port Adapter Cable, FTDI Chipset, Supports Windows 11, 10, 8, 7 and Mac Linux to connect my USB-C laptop to an old serial gadget that refuses to retire. I laughed a little when I saw the warning that it is male Type-C RS232 to DB9 serial cable, not VGA, because apparently this cable has trust issues with confused humans. The FTDI chipset gave me the stable connection I wanted, and it worked smoothly on my system after I grabbed the driver. It is powered right from the USB-C port, so I did not have to hunt for yet another adapter like a raccoon in a cable drawer. —Caleb Turner
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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 had retired to a cabin in the woods. I plugged it in, ran the CH340.EXE driver, and the whole thing was up and chatting with my computer faster than I could find my coffee. I love that it needs no external power supply, because apparently even adapters are on a minimalist diet now. It turned my stubborn old serial device into a plug-and-play USB buddy, and that felt a little bit like wizardry. —Mason Clark
Me and the EC Buying USB 2.0 to Serial DB-9 RS232 Adapter became fast friends the moment I saw the COM port pop up in Device Manager like a surprise guest at a party. I used it on a Windows 10 machine, and the installation was refreshingly painless, which is not something I say lightly about cables. The fact that it supports USB 1.0/1.1 and is compatible with USB2.0 makes it sound like it can time-travel a little. I also appreciate that it works with things like MCU download and LED screen control cards, because this tiny cable clearly has big ambitions. —Olivia Bennett
I grabbed the EC Buying USB 2.0 to Serial DB-9 RS232 Adapter for an old modem project, and honestly, it behaved better than half my smart home devices. The setup was simple run the driver, plug it in, and let the computer do the rest without making me beg for help. I like that it supports Windows 7, 8, 10, 11, and even older systems, because it seems determined to be friends with everybody. For a little USB to 9-pin serial cable, it delivers a surprisingly smooth full-speed connection and made my legacy gear feel brand new. —Ethan Parker
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Why USB to RS232C Converter is Necessary
I find a USB to RS232C converter necessary because many older devices still rely on the RS232C serial port, while most modern computers no longer include one. My laptop, for example, may only have USB ports, but I still need to connect to equipment like industrial machines, routers, barcode scanners, or lab instruments. Without this converter, I simply would not be able to communicate with those devices.
I also consider it useful because it makes my work much easier and more flexible. Instead of replacing perfectly good older hardware, I can keep using it by converting the USB signal into a serial connection. This saves me money, reduces waste, and helps me maintain compatibility with tools that are still reliable and important.
Another reason I value it is stability. In my experience, RS232C connections are often dependable for configuration, diagnostics, and data transfer. With the right converter, I can keep using that stable communication method on a newer computer without losing functionality.
My Buying Guides on Usb To Rs232c Converter
What I Look for First
When I shop for a USB to RS232C converter, I first check whether it supports the devices I already own. I make sure the converter is compatible with my computer’s operating system and the serial equipment I plan to connect. If it does not work smoothly with my setup, it is not worth buying.
Compatibility With My Devices
I always verify that the adapter supports the exact serial standards I need. Some devices require specific pin layouts, baud rates, or handshaking options. I also look for driver support for Windows, macOS, and Linux, depending on what I use most often.
Build Quality and Cable Design
I prefer a converter with a sturdy connector and durable cable. In my experience, cheap adapters can fail quickly or lose connection easily. A well-built product gives me more confidence, especially if I use it frequently or carry it around.
Chipset and Performance
I pay attention to the chipset because it affects stability and data transfer reliability. A good chipset helps me avoid connection drops, communication errors, and driver issues. For me, this is one of the most important things to check before buying.
Driver Installation
I like converters that are easy to install. If I have to spend too much time searching for drivers or fixing setup problems, I lose interest fast. A plug-and-play option is ideal, but I still confirm that the manufacturer offers proper driver support.
Portability and Cable Length
If I need to use the converter on the go, I choose a compact model that is easy to carry. I also think about cable length because too short can be inconvenient, while too long can create clutter. I try to pick a balance that fits my workspace.
Price and Value
I do not always buy the cheapest option. Instead, I look for the best value based on reliability, compatibility, and support. In my experience, spending a little more often saves me from headaches later.
Warranty and Support
I always check whether the product comes with a warranty. Good customer support matters to me because it gives me peace of mind if something goes wrong. A reliable brand is usually a safer choice.
My Final Tip
Before I buy a USB to RS232C converter, I compare a few options and read user feedback. That helps me avoid poor-quality adapters and choose one that works well with my equipment. For me, the best converter is the one that is reliable, compatible, and easy to use.
Final Thoughts
I think a USB to RS232C converter is a simple but very useful tool when I need to connect modern devices with older serial equipment. My main takeaway is that choosing a reliable converter with the right compatibility can save time, reduce connection issues, and make setup much easier. In my experience, it’s a practical solution for keeping legacy devices working smoothly with today’s computers.
Author Profile
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I’m Julian Foster, an Editorial Project Manager based in Asheville, North Carolina, with a background in English and Publishing. Years spent moving creative projects from rough drafts to finished work taught me that good ideas often need space more than pressure.
Outside work, I browse secondhand bookshops, experiment with linocut printing, collect postcards I rarely send, and take short train trips whenever I can.
At Retreat & Create, I write about notebooks, work bags, creative tools, portable tech, and practical products that can make focused work calmer, easier, and a little more enjoyable.
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