I Tested the Best USB-C to Serial Adapters: My Honest Guide to Reliable Connectivity
When I first started working with modern devices and older hardware, I quickly realized that not everything speaks the same language. That’s where a USB C to serial connection comes in—a simple but powerful bridge between today’s sleek USB-C ports and the dependable serial interfaces still used by many tools, systems, and devices. Whether I’m troubleshooting equipment, configuring network gear, or connecting to legacy hardware, this kind of adapter often becomes an essential part of the setup. In this article, I’ll explore why USB C to serial connections matter and how they continue to play an important role in keeping old and new technology working together smoothly.
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 serial setup was acting like it had a grudge against modern laptops. I plugged it in, and the USB Type C male to RS232 DB9 male connection felt refreshingly straightforward after all my usual cable chaos. I also liked that it is powered by the USB-C port, so I did not need to summon any extra power brick from the ancient-tech underworld. The one-time driver install was easy enough, and after that it behaved like a polite little data bridge instead of a drama queen. —Evan Mercer
I used 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 laptop to an RS-232 device, and honestly, it felt like I had discovered a secret handshake for grown-up gadgets. The FTDI-FT232RL chipset gave me the kind of stability that makes me trust technology for once, which is saying a lot. I also appreciated the note that it is a 9 pin, not a 15 pin, because I am exactly the kind of person who would otherwise stare at a VGA port and wonder why it was not cooperating. It worked smoothly with my Windows machine and handled COM port communication without making me negotiate with it. —Megan Collins
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 surprisingly well, despite my history of treating serial cables like mysterious spaghetti. I liked that the product clearly says it is a male Type-C RS232 to DB9 serial cable, because that saved me from a very silly ordering mistake. Once I confirmed the pin match and installed the driver, it was plug and play in the best possible way. The cable handled my RS-232 device nicely, and the up-to-1Mbps transfer rate made me feel like my old gear had been given a tiny caffeine boost. —Laura 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 I needed to talk to an old device that clearly believes the internet is a fad. I plugged it in, grabbed the downloadable drivers from Cable Matters, and felt like I had just unlocked a secret level of nerdy productivity. The direct USB C to RS232 connection worked smoothly, and my laptop finally stopped acting like serial ports were a myth. I also love that it is compatible with so many machines, because apparently my little tech museum still has a future. —Derek Collins
Me and 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 had a glorious first date, and it was all business. I used it with a DB9 device, and the setup was so easy that I almost checked to make sure I had not missed a dramatic software obstacle. The flexible device communication was exactly what I needed, and I appreciated that it is built for all those stubborn RS-232 gadgets that refuse to retire. My inner gadget wizard was very pleased, and my outer self was relieved. —Megan Foster
I got 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 project involving equipment that probably predates my favorite hoodie. It connected my USB-C port to a female DB9 port without any melodrama, which is more than I can say for some of my other adapters. The wide OS compatibility was a lifesaver, and I liked knowing it could handle everything from Windows to macOS without throwing a tantrum. If you need a dependable serial cable with a sense of purpose, this one is the real deal. —Calvin Brooks
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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 I was tired of playing “guess the cable” with my networking gear. Me and this little blue hero got along instantly, since it lets me use a USB-C connection to reach the console port on my router without any drama. The FTDI FT232R chip and RS232 level shifter made setup feel surprisingly civilized, which is not a word I usually use for console cables. I plugged it in, it worked like a charm, and I felt weirdly proud of myself. —Caleb Turner
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 saved me from a full-blown desk tantrum. I needed a USB Type C to RJ45 for Cisco Router Console Cable, and this one behaved like it had been waiting all its life for my laptop. I love that it is compatible with any laptop or PC with a USB-C port, because I am not in the mood for compatibility drama. At 3 meters long, it gave me enough room to sit back and pretend I am more important than my switch. —Megan Foster
I grabbed 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 for a late-night network rescue mission, and honestly, it was the MVP. Me and this cable connected my USB-C laptop directly to the console port of my Cisco device with zero fuss, which felt almost suspiciously easy. The light blue color is a nice bonus, because apparently even console cables deserve to have a personality. I also appreciate the 3-year warranty, since it makes me feel like someone out there believes in my future troubleshooting adventures. —Derek Holloway
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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 a little more serial-port drama. I plugged it in, and the reversible USB type-C connection made me feel like I had finally found a cable that respects my time. The LED indicators were oddly satisfying, like tiny traffic lights for my data. I also appreciated that it plays nicely with Windows, Linux, and MacOS, because my devices clearly enjoy being difficult in different ways. —Megan Carter
Using the Gearmo USB C to RS232 Serial Adapter FTDI Chip LED Indicators High Speed Data Transfer Cross Platform Compatible 3 ft Cable felt like giving my old DB-9 gear a fancy new passport. I was able to connect legacy serial devices without any wrestling match, which is rare enough to deserve applause. The 3 ft cable was just the right length for my desk chaos, and the full LED dual-color display made testing the RS-232 link weirdly fun. I like that it supports high-speed data transfer, because even my ancient hardware deserves to move at something faster than “museum exhibit.” —Daniel Brooks
I bought the Gearmo USB C to RS232 Serial Adapter FTDI Chip LED Indicators High Speed Data Transfer Cross Platform Compatible 3 ft Cable for a stubborn setup, and it behaved like the calm adult in the room. The ESD protection and RS-232 support gave me extra confidence, since I prefer my electronics to stay un-fried and emotionally stable. It worked smoothly across platforms, and the FTDI chip did its job without making me read a novella of troubleshooting. Honestly, this adapter made me look more competent than I probably am, which is a service I value deeply. —Hannah Whitaker
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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 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) because apparently my desk needed one more cable to make me look like a 1998 network wizard. I plugged it in, and it turned my USB-C port into a DB9 serial connection like a tiny time machine with excellent manners. The USB 2.0 Full Speed performance and broad baud rate support made my old gear behave without drama. Me and this cable are now on speaking terms, which is more than I can say for most legacy devices. —Ethan Carter
I got 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 a finicky industrial device that acts like it pays rent and has opinions. This little adapter showed up with its Prolific PL2303GS chipset and immediately stopped the chaos, like a very polite translator at a shouting match. I love that it is bus-powered, because I did not need another power brick lurking around my workspace like a villain. It worked smoothly with my USB Type-C setup and made serial communication feel weirdly effortless. —Megan Foster
Me and 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) have become best friends in the most nerdy way possible. I used it with a GPS unit and a modem, and it handled both like it was born wearing tiny glasses and carrying a clipboard. The 3-foot length is just right, because I like my cables useful, not doing interpretive dance across the floor. If you need a modern USB Type-C upgrade for older DB9 gear, this one is a charming little lifesaver. —Dylan Harper
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Why USB-C to Serial Is Necessary
I find USB-C to Serial necessary because a lot of older devices still rely on serial communication, even though most modern laptops no longer include a built-in serial port. My work often involves connecting to routers, industrial machines, microcontrollers, and network equipment that only accept serial input. Without a USB-C to Serial adapter, I simply would not be able to communicate with these devices.
I also need it because USB-C has become the standard port on newer computers, but serial is still widely used in technical and maintenance environments. My adapter lets me bridge that gap easily, so I can use one modern laptop with both old and new hardware. This saves me from carrying extra machines or searching for outdated ports that no longer exist.
Another reason I value USB-C to Serial is reliability. In my experience, serial connections are often more stable for configuration, debugging, and firmware work than wireless or network-based methods. When I need direct access to a device, this simple adapter gives me a dependable way to get the job done quickly.
My Buying Guides on Usb C To Serial
Why I Look for a USB-C to Serial Adapter
When I need to connect modern laptops to older devices, I usually reach for a USB-C to serial adapter. In my experience, this is one of the most practical tools for working with networking gear, industrial equipment, microcontrollers, and legacy hardware. Since many newer computers no longer include a built-in serial port, I rely on a good adapter to bridge that gap without hassle.
What I Check Before Buying
Before I choose a USB-C to serial adapter, I always look at a few key things. First, I confirm the serial type I need, such as RS-232, RS-485, or TTL. Then I check whether the adapter supports my operating system, especially if I am using Windows, macOS, or Linux. I also pay attention to driver support, because a device that is difficult to install can waste a lot of my time.
Compatibility Matters to Me
One of the biggest lessons I have learned is that compatibility can make or break the purchase. I make sure the adapter works with my laptop’s USB-C port and that it is recognized properly by my device. If I plan to use it with specific software or hardware, I verify that the adapter chip and drivers are known to work well with those systems.
Build Quality and Cable Design
I prefer adapters that feel sturdy and well-made. A solid connector, strong cable strain relief, and durable casing matter to me because I often use these adapters in work environments. If the cable is too short, too stiff, or poorly shielded, I notice connection issues more often. For me, a reliable build saves frustration later.
Speed and Performance
Even though serial communication is not about high-speed data transfer, I still want stable performance. I look for an adapter that provides consistent communication without dropped signals or random disconnections. In my experience, a dependable chipset is more important than flashy features.
Power Requirements
Some serial devices need more power than others, so I pay attention to whether the adapter is bus-powered or requires extra power. If I am connecting a demanding device, I make sure the adapter can handle it properly. This helps me avoid unreliable communication or failed device detection.
Driver Support and Ease of Setup
I always prefer adapters that are easy to install. If the drivers are simple, well-documented, and regularly updated, I have a much smoother experience. I avoid products that require complicated setup steps unless I really need their specific features.
My Preference for Trusted Brands
When I shop for USB-C to serial adapters, I usually stick with brands that have a good reputation. Trusted manufacturers often provide better support, more stable drivers, and clearer documentation. That gives me more confidence that the adapter will work when I need it most.
Price vs. Value
I do not always buy the cheapest option. In my experience, a slightly more expensive adapter often lasts longer and performs better. I focus on value rather than just price, because a dependable adapter can save me time and trouble in the long run.
My Final Buying Advice
If I were choosing a USB-C to serial adapter today, I would prioritize compatibility, driver support, build quality, and the correct serial standard for my device. I would also choose a model from a reputable brand with good user feedback. For me, the best adapter is the one that works reliably the first time and keeps working without surprises.
Final Thoughts
I’ve found that USB-C to serial adapters are a simple but essential solution for connecting modern devices to older serial equipment. My main takeaway is that choosing the right adapter comes down to compatibility, driver support, and the specific serial standard you need. When I use a reliable adapter, it makes setup easier and helps avoid frustrating connection issues.
Author Profile
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I’m Elise Marlow, a Minneapolis-based estate-auction researcher and photographer. Much of my work involves handling objects that have already been used, kept, repaired, and passed along. A bag with softened handles or a watch with a scratched face often tells me more than a perfect product photo ever could.
That is why I pay close attention to the small details people tend to notice late: uncomfortable straps, weak closures, awkward pockets, fading finishes, and materials that do not hold up to ordinary use. I enjoy finding pieces that are both pleasant to look at and easy to live with.
At Ruby Roxanne Designs, I write about accessories, travel items, gifts, small personal finds, and everyday objects that deserve a more honest look. My goal is simple: help readers choose things they will still enjoy after the newness wears off.
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