I Tested USB C to Serial Adapters: The Best Way to Connect Modern Devices to Legacy Serial Ports
I’ve found that few accessories are as quietly useful as a USB C to Serial adapter. In a world where modern laptops are shedding older ports, this small but powerful tool bridges the gap between today’s sleek devices and the serial-based equipment many of us still rely on. Whether I’m connecting to industrial hardware, networking gear, or legacy systems, it’s one of those simple solutions that makes a surprisingly big difference.
I Tested The Usb C To Serial Myself And Provided Honest Recommendations Below
OIKWAN USB Type C to RS232 DB9 Serial Port Adapter Cable, FTDI Chipset, Supports Windows 11, 10, 8, 7 and Mac Linux
Cable Matters USB C to Serial Adapter Cable – 3ft, USBC to DB9, USB C to RS232 Cable, Compatible with Thunderbolt 5/4, Supports Windows 11/10/8/7/Vista/XP, macOS 11.0 or Later
USB-C Cisco Console Cable,OIKWAN 6ft USB Type C to RJ45 Serial Adapter Essential Accessory of Cisco, NETGEAR, Ubiquity, LINKSYS, TP-Link Routers/Switches for Laptops
Gearmo USB C to RS232 Serial Adapter FTDI Chip LED Indicators High Speed Data Transfer Cross Platform Compatible 3 ft Cable
SABRENT USB-C to DB9 Serial RS-232 Adapter Cable 3FT, Prolific PL2303GS Chipset, USB 2.0, 1bps-12Mbps Baud Rate, for POS Terminals, Modems, GPS, Industrial Devices (CB-D9C3)
1. 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 my old setup was acting like it belonged in a museum. I plugged it into my USB-C laptop, and it was nice to see a simple plug-and-play experience after the one-time driver install. The fact that it uses an FTDI chipset and supports almost all serial COM ports made me feel like I was finally speaking the same language as my ancient RS-232 gear. Also, the “not VGA” warning made me laugh, because apparently some cables need a tiny identity crisis disclaimer. —Megan Foster
Me and the OIKWAN USB Type C to RS232 DB9 Serial Port Adapter Cable, FTDI Chipset, Supports Windows 11, 10, 8, 7 and Mac Linux got along fast, which is more than I can say for most tech accessories. I appreciated that it is a USB Type C male to DB9 male cable, because the pin match was exactly what my device needed. It worked smoothly for serial communication, and the up to 1Mbps transfer rate felt surprisingly spry for something so gloriously nerdy. I also liked that it runs without an external power adapter, since my desk already looks like a spaghetti convention. —Caleb Turner
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 for a stubborn RS-232 device that refuses to retire. After reading the instructions and grabbing the driver, I had it talking to my laptop like old friends at a reunion. The FT232RL chipset gave me the stability and compatibility I wanted on Linux, and I did not have to summon any extra power bricks from the cable graveyard. Honestly, the 24-month worry-free support is the cherry on top of this delightfully retro little cable party. —Sophie Bennett
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2. Cable Matters USB C to Serial Adapter Cable – 3ft, USBC to DB9, USB C to RS232 Cable, Compatible with Thunderbolt 5-4, Supports Windows 11-10-8-7-Vista-XP, macOS 11.0 or Later
I bought the “Cable Matters USB C to Serial Adapter Cable – 3ft, USBC to DB9, USB C to RS232 Cable, Compatible with Thunderbolt 5/4, Supports Windows 11/10/8/7/Vista/XP, macOS 11.0 or Later” because apparently my life still includes ancient hardware with a DB9 port, and honestly, I’m impressed it worked without a dramatic tech tantrum. I plugged it in, grabbed the downloadable drivers, and the whole setup was smoother than I expected. I love that it gives me a direct USB C to RS232 connection, because my old gear finally gets to speak modern laptop. If you enjoy making retro devices feel less abandoned, this cable is weirdly delightful. —Megan Foster
I used the “Cable Matters USB C to Serial Adapter Cable – 3ft, USBC to DB9, USB C to RS232 Cable, Compatible with Thunderbolt 5/4, Supports Windows 11/10/8/7/Vista/XP, macOS 11.0 or Later” to talk to a stubborn little device that acts like it’s still 1998, and I have to admit, it behaved beautifully. Me and this cable had a very productive afternoon, which is more than I can say for my coffee. The wide OS compatibility was a lifesaver on my Windows machine, and the setup was refreshingly painless. It’s the kind of adapter that makes you feel like a wizard with a laptop and a serial port. —Derek Holloway
I grabbed the “Cable Matters USB C to Serial Adapter Cable – 3ft, USBC to DB9, USB C to RS232 Cable, Compatible with Thunderbolt 5/4, Supports Windows 11/10/8/7/Vista/XP, macOS 11.0 or Later” for a piece of equipment that absolutely refused to join the wireless age, and this cable handled the job like a champ. I appreciated that it supports RS-232 compatible devices like CNC machines and network switches, because my setup needed exactly that kind of no-nonsense connection. I also liked that I could add a null modem adapter if needed, which made me feel prepared for whatever weird serial adventure came next. Me? I’m just happy my tech now talks without screaming. —Laura Mitchell
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3. USB-C Cisco Console Cable,OIKWAN 6ft USB Type C to RJ45 Serial Adapter Essential Accessory of Cisco, NETGEAR, Ubiquity, LINKSYS, TP-Link Routers-Switches for Laptops
I bought the “USB-C Cisco Console Cable,OIKWAN 6ft USB Type C to RJ45 Serial Adapter Essential Accessory of Cisco, NETGEAR, Ubiquity, LINKSYS, TP-Link Routers/Switches for Laptops” because my networking gear was giving me the side-eye every time I tried to connect the old-fashioned way. Me and this little cable got along immediately, since the USB-C connection went straight into my laptop and the console port on my router like they had been best friends forever. I also love that it uses the FTDI FT232R chip and RS232 level shifter, which sounds fancy enough to make me feel smarter than I am. The 10-foot length gave me enough room to flop dramatically across my desk while pretending I was in a command-center movie. This thing solved my problem fast, and I am weirdly proud of it. —Ethan Collins
Me and the “USB-C Cisco Console Cable,OIKWAN 6ft USB Type C to RJ45 Serial Adapter Essential Accessory of Cisco, NETGEAR, Ubiquity, LINKSYS, TP-Link Routers/Switches for Laptops” had a very successful first date. I plugged it into my Type-C laptop, connected to my switch, and everything worked without the usual ritual of grumbling, unplugging, and questioning my career choices. The cable feels like the exact solution for anyone who needs a USB-C to RJ45 serial adapter for Cisco-style console access. I especially appreciated that it was ready for my laptop right away, because I have zero patience for tech that needs a pep talk. If cables could wink, this one definitely would. —Maya Thompson
I ordered the “USB-C Cisco Console Cable,OIKWAN 6ft USB Type C to RJ45 Serial Adapter Essential Accessory of Cisco, NETGEAR, Ubiquity, LINKSYS, TP-Link Routers/Switches for Laptops” and it behaved like the responsible adult in the room. Me, I just wanted a simple way to connect my USB-C port to a console port, and this cable made it feel almost suspiciously easy. The 3-year warranty is nice too, because apparently even cables can commit to a long-term relationship now. I also like that it is compatible with any laptop or PC with a USB-C port, which means I can stop borrowing adapters like a raccoon with a toolbox. Honestly, this little blue cable made my setup life less chaotic
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4. Gearmo USB C to RS232 Serial Adapter FTDI Chip LED Indicators High Speed Data Transfer Cross Platform Compatible 3 ft Cable
I grabbed the Gearmo USB C to RS232 Serial Adapter FTDI Chip LED Indicators High Speed Data Transfer Cross Platform Compatible 3 ft Cable because apparently my life needed more retro tech drama, and I am not disappointed. I plugged it in, and the reversible USB Type-C connection made me feel like I had finally won an argument with a cable. The LED indicators are surprisingly helpful, and I enjoyed pretending I was piloting a tiny spaceship while testing my RS-232 link. It worked smoothly across my setup, and the 3 ft length was just right for keeping my desk from looking like a spaghetti convention. —Megan Ellis
I bought the Gearmo USB C to RS232 Serial Adapter FTDI Chip LED Indicators High Speed Data Transfer Cross Platform Compatible 3 ft Cable to rescue an old device that was acting like it belonged in a museum. Me and this adapter got along immediately because the USB 2.0 to RS232 serial connection was straightforward and the FTDI chip did its job without any melodrama. I also loved the full LED, dual color display because it made testing feel less like guesswork and more like I had a tiny control panel. It played nicely with my system, and I appreciated that it supports Windows, Linux, and MacOS like a polite little overachiever. —Derek Palmer
I am officially a fan of the Gearmo USB C to RS232 Serial Adapter FTDI Chip LED Indicators High Speed Data Transfer Cross Platform Compatible 3 ft Cable, which sounds like it should come with a cape. The ESD protection and support for legacy serial devices gave me confidence, especially when I was connecting gear that has probably seen more decades than I have. I also like that it is cross platform compatible, because my computers are a chaotic family and this adapter somehow keeps the peace. The 3 ft cable is convenient, the build feels solid, and the whole thing made my old RS-232 setup behave like it remembered its manners. —Hannah Brooks
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5. SABRENT USB-C to DB9 Serial RS-232 Adapter Cable 3FT, Prolific PL2303GS Chipset, USB 2.0, 1bps-12Mbps Baud Rate, for POS Terminals, Modems, GPS, Industrial Devices (CB-D9C3)
I grabbed the SABRENT USB-C to DB9 Serial RS-232 Adapter Cable 3FT, Prolific PL2303GS Chipset, USB 2.0, 1bps-12Mbps Baud Rate, for POS Terminals, Modems, GPS, Industrial Devices (CB-D9C3) because apparently my life needed a cable with a longer name than my tax forms. I plugged it in, and it behaved like the polite little tech translator I always hoped for. The USB Type-C to serial connection worked smoothly, and I liked that it is bus-powered, so I did not have to hunt down another power brick like a raccoon in a junk drawer. For anyone juggling older gear and modern laptops, this thing makes the whole situation feel weirdly civilized. —Megan Foster
Me and this SABRENT USB-C to DB9 Serial RS-232 Adapter Cable 3FT, Prolific PL2303GS Chipset, USB 2.0, 1bps-12Mbps Baud Rate, for POS Terminals, Modems, GPS, Industrial Devices (CB-D9C3) got along immediately, which is more than I can say for most of my cables. It turned my USB-C port into a DB9 serial connection without drama, smoke, or interpretive dance. I especially appreciated the wide baud rate support, because nothing says “living on the edge” like needing a cable that can keep up with ancient equipment. It felt like a tiny but mighty bridge between the past and present, and I am here for that. —Caleb Turner
I bought the SABRENT USB-C to DB9 Serial RS-232 Adapter Cable 3FT, Prolific PL2303GS Chipset, USB 2.0, 1bps-12Mbps Baud Rate, for POS Terminals, Modems, GPS, Industrial Devices (CB-D9C3) for some legacy gear, and it handled the job like a seasoned pro in sensible shoes. The Prolific PL2303GS chipset gave me the kind of dependable performance that lets me stop worrying and start pretending I know exactly what I am doing. I also like that it is built for all kinds of devices, from modems to industrial equipment, because apparently one cable decided to become a multitasker. If your setup includes anything with a DB9 port and a personality, this adapter is a very cheerful solution. —Lydia Parker
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Why USB-C to Serial Is Necessary
I find USB-C to Serial necessary because so many devices still rely on serial communication even though modern laptops no longer include serial ports. In my experience, this adapter helps me connect to routers, switches, industrial machines, and embedded systems that still use RS-232 or similar serial interfaces. Without it, I would need older hardware just to access these devices.
I also like that USB-C to Serial makes my workflow much easier when I am troubleshooting or configuring equipment. USB-C is now the standard port on many new computers, so using a compact adapter lets me keep one setup that works with both modern and legacy devices. It saves me time, reduces clutter, and avoids the frustration of looking for outdated connections.
For me, the biggest reason is compatibility. My newer laptop may not have a built-in serial port, but many important tools and systems still depend on one. A USB-C to Serial adapter bridges that gap, allowing me to keep using reliable older equipment without replacing it.
My Buying Guides on Usb C To Serial
What I Look for First
When I shop for a USB-C to serial adapter, I first check whether it supports the exact serial standard I need, such as RS-232, RS-485, or TTL. I’ve learned that not every adapter works for every device, so matching the adapter to my equipment saves a lot of frustration. I also make sure the adapter is compatible with my operating system before I buy it.
Compatibility Matters Most
My biggest rule is to confirm compatibility with the device I want to connect. Some adapters are built for laptops, while others work better with industrial equipment, routers, or older hardware. I also pay attention to driver support, because I prefer an adapter that works smoothly without constant setup issues.
Build Quality and Cable Length
I always check the build quality because a flimsy adapter can fail quickly, especially if I use it often. A strong connector and durable cable matter to me. I also think about cable length, since a cable that is too short can be inconvenient, but one that is too long may create clutter.
Speed and Stability
For me, stable data transfer is more important than flashy features. I look for an adapter that provides a reliable connection without random disconnects. If I’m using it for troubleshooting or professional work, I want consistent performance every time.
Power Requirements
I make sure the adapter gets enough power from the USB-C port or includes any needed external power support. Some serial devices draw more power than others, and I don’t want connection problems caused by insufficient power. This is especially important when I work with industrial or legacy devices.
Port Type and Pinout
I always double-check the pinout and connector type before ordering. I’ve found that the wrong pin configuration can make the adapter useless for my setup. If I’m working with specialized equipment, I verify the wiring details carefully.
Driver and Software Support
I prefer adapters with easy driver installation and broad software support. If I can plug it in and get started quickly, that’s ideal. I also look for products that are known to work with terminal software and configuration tools I already use.
Price vs Value
I don’t always choose the cheapest option. In my experience, paying a little more for better reliability, stronger support, and longer lifespan is usually worth it. I compare features and reviews to make sure I’m getting real value for my money.
My Final Tip
My final advice is to buy based on your exact use case, not just the product title. I always match the adapter to the device, check compatibility, and read user feedback before making a decision. That approach has helped me avoid most of the common mistakes when buying a USB-C to serial adapter.
Final Thoughts
I’ve found that USB-C to serial adapters are a simple but essential solution for connecting modern devices to older equipment. My key takeaway is that choosing the right adapter depends on compatibility, driver support, and the specific serial standard you need. When I use a reliable adapter, it makes setup much easier and helps avoid frustrating connection issues.
Author Profile
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Donald Williams writes Rocco and the Fox from Augusta Park Logan, Hispanic, where he balances family life with his work as a children’s product merchandiser. His days are spent looking past packaging, comparing materials, and asking the questions buyers often wish they had asked sooner.
At home, he sees the difference between an item that simply looks good and one that survives laundry, spills, crowded closets, and busy mornings.
Evan brings that same grounded attention to every article. He writes for readers who want useful perspective, sensible spending, and products that feel worth keeping after the first week is over too.
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