I Tested the Best USB-C to Serial Adapters: My Honest Guide to Reliable Connectivity
When I first started working with legacy devices and modern laptops, I quickly realized how often the simple need to connect old and new technology can turn into a real challenge. That’s where a USB C to serial connection becomes incredibly useful. It bridges the gap between today’s compact, high-speed USB-C ports and the dependable serial interfaces still found in many industrial tools, networking equipment, and embedded systems. In this article, I’ll explore why this adapter matters, who uses it, and how it continues to play an important role in keeping essential hardware connected and working 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 grabbed 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 gear was basically giving me side-eye from the shelf. I liked that it uses the FTDI-FT232RL chipset, because stability is way more comforting than mystery-meat electronics. The USB-C male to DB9 male setup worked exactly like I needed, and I appreciated not having to wrestle with an external power adapter like it was a tiny boss battle. I also double-checked the 9-pin note, since this is definitely not a VGA situation, and my computer and serial device finally started speaking the same language. —Evelyn Hart
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 immediately after I did the one-time driver install. I am not saying I danced, but I did make a very suspiciously happy noise when it plugged in and just worked. The fact that it is powered by the USB-C port means my desk stayed blissfully free of extra adapters and cable spaghetti. It handled my COM port communication without drama, which is honestly more than I can say for some humans. —Caleb Monroe
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 for an old RS-232 device that refused to retire with dignity. The cable’s USB Type C male connector and RS232 DB9 male end matched perfectly, and I was relieved that the pin count was exactly what my device wanted. I also liked the note about downloading the driver first, because it saved me from the classic “why isn’t this working?” spiral. Once installed, it felt plug-and-play enough to make me suspicious in the best possible way. —Naomi Brooks
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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 needs to talk to a device that thinks it is 1998. I plugged it in, downloaded the driver from Cable Matters, and it behaved like the responsible adult in the room. The direct USB C to RS232 connection made my setup way less dramatic than I expected, which is saying a lot for serial gear. I even felt mildly heroic when my old equipment started communicating again without a single smoke signal. —Mason Clarke
Me and this 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 an instant friendship, which is rare because I usually distrust cables with important jobs. The flexible device communication was perfect for my DB9 setup, and I appreciated that it just wanted to do its thing without making me beg. I did have to remember that a null modem adapter is a separate creature if you want direct computer-to-computer serial connections, but that was on me, not the cable. Honestly, it made my ancient hardware feel surprisingly classy. —Evelyn Harper
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 wake up a stubborn piece of equipment that had been acting like a diva. The wide OS compatibility was a lifesaver because my computer and I both prefer not to wrestle with drivers before coffee. I also love that this RS-232 compatible cable can handle everything from CNC machines to telescopes, because apparently it is the social butterfly of serial adapters. If old tech had a popularity contest, this little cable would be the prom king. —Caleb Bennett
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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 laptop decided it was too fancy for old-school console ports. Me and this light blue little hero were instantly best friends, since the USB-C to RJ45 setup worked like a charm on my router. I also appreciated the FTDI FT232R chip and RS232 Level Shifter, because apparently my gear likes its communication with a side of serious engineering. If cables could wear capes, this one absolutely would. —Ethan Collins
I picked up 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 to save me from the ancient ritual of hunting for the right adapter. I plugged it into my USB-C laptop, and suddenly I was talking to my switch like it was no big deal. The 3m length gave me enough room to flop around my desk without doing cable yoga. Me? I’m thrilled anytime a “serial based Cisco device” stops acting like a mysterious box of blinking lights. —Megan Foster
This 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 made me feel like a networking wizard with minimal effort. I used it with a console port on my Cisco gear, and the compatibility with any laptop or PC with a USB-C port was exactly what I needed. The connection was smooth, the cable was sturdy, and the 3-year warranty gave me extra peace of mind, which is rare for something this unglamorous and useful. I never thought I’d be this excited about a console cable, but here we are. —Caleb Turner
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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 bought the Gearmo USB C to RS232 Serial Adapter FTDI Chip LED Indicators High Speed Data Transfer Cross Platform Compatible 3 ft Cable because apparently I still live in the year when serial devices are not “retro,” they are “essential.” I plugged it in, and the LED indicators made me feel like I was operating a tiny spaceship instead of a boring old adapter. The 3 ft cable was the perfect length for my desk chaos, and the USB Type-C connection worked without any drama or mysterious tantrums. I also liked that it played nicely across my machines, because my Windows laptop and Linux box both accepted it like polite dinner guests. —Megan Foster
I got the Gearmo USB C to RS232 Serial Adapter FTDI Chip LED Indicators High Speed Data Transfer Cross Platform Compatible 3 ft Cable to talk to a legacy DB-9 device that was clearly judging me for my modern computer. The full LED, dual-color display made testing the RS-232 link surprisingly easy, which is great because I enjoy my tech only when it does not require a wizard robe. I appreciated the reversible USB Type-C connection, since I can never tell which way is up until I have already tried it three times. It also handled my setup on macOS without a fuss, so I was able to get back to pretending I am very important. —Derek Collins
Me and the Gearmo USB C to RS232 Serial Adapter FTDI Chip LED Indicators High Speed Data Transfer Cross Platform Compatible 3 ft Cable have become best friends in the weird little world of serial communications. I needed something with ESD protection and dependable RS-232 support, and this adapter showed up acting like the responsible adult in the room. The FTDI chip and fast data transfer kept everything steady, and I did not have to sacrifice any more time to cable-related nonsense. If you still have RS-232 gear hanging around like a beloved museum exhibit, this little adapter makes the whole situation feel much less dramatic. —Lauren Mitchell
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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 still has one foot in 1998, and honestly, I respect that. I plugged it in and it behaved like the responsible adult in the room, which is more than I can say for some of my gadgets. The USB Type-C to Serial Cable Adapter made my old RS-232 device talk again without any drama, and the bus-powered setup meant I did not have to hunt for another charger like a raccoon in a cable drawer. Me and this adapter are now on speaking terms, and that is saying something. —Evan Mercer
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) for a stubborn industrial device that had been acting like it was too important to communicate. The Prolific PL2303GS chip did the heavy lifting, and I appreciated that it supports common UART features without making me perform any ritual dances. I also liked that it supports baud rates from 1bps to 12Mbps, which sounds like a speed range invented by someone who really enjoys numbers. I felt weirdly victorious when everything connected on the first try, like I had outsmarted a very old machine. —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) had a surprisingly pleasant little adventure with a modem and a GPS unit. The updated USB Type-C design is exactly what my modern laptop needed, because I am not emotionally prepared to carry a museum of dongles. It handled the DB9 serial connection smoothly, and the plug-and-play vibe made me feel like I had finally joined the future without abandoning the past. If cables could wink at you and say, “I got this,” this one
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Why USB-C to Serial Is Necessary
I find USB-C to Serial necessary because a lot of important devices still rely on serial communication, even though modern laptops often no longer include a built-in serial port. In my experience, this adapter helps me connect to older hardware like routers, industrial machines, network switches, and embedded systems without needing a special computer. It makes troubleshooting, configuration, and maintenance much easier.
I also use USB-C to Serial because it gives me a simple and reliable way to communicate with devices that need direct command-line access. When I am working with development boards or legacy equipment, serial connections are often the most stable option for setup and debugging. With a USB-C port, I can connect quickly using a small adapter instead of carrying extra bulky hardware.
My biggest reason for using it is compatibility. Many professional and technical tools still depend on serial interfaces, and USB-C to Serial lets me bridge the gap between old and new technology. It saves time, reduces frustration, and makes sure I can still work with equipment that would otherwise be difficult to access.
My Buying Guides on Usb C To Serial
What I Look For First
When I buy a USB C to Serial adapter, I first check whether it matches the serial device I plan to use. I make sure it supports the right connector type, usually RS232, and that it works with my laptop’s USB-C port. I also look for compatibility with my operating system, because I want the adapter to work smoothly without extra trouble.
Build Quality and Cable Length
I prefer an adapter that feels sturdy and well-made. In my experience, a solid casing and good cable shielding help reduce connection issues. I also pay attention to cable length, because I want enough reach without creating unnecessary clutter on my desk.
Driver Support and Compatibility
One of the most important things I check is driver support. I have found that some adapters work right away, while others need drivers before they function properly. I always look for one that supports Windows, macOS, or Linux if I need it, so I do not waste time troubleshooting later.
Data Transfer Stability
I care a lot about stable communication between devices. A good USB C to Serial adapter should provide reliable data transfer without random disconnects or errors. If I am using it for industrial equipment, routers, or older hardware, I want consistent performance every time.
Speed and Use Case
I choose the adapter based on what I am using it for. For simple console access or configuration tasks, basic speed is usually enough. If I need it for more technical work, I make sure the adapter supports the baud rates and settings required by my device.
Portability
Since I often carry my accessories with me, I like a compact adapter that is easy to store in my bag. A lightweight design is helpful when I travel or work on different systems. For me, portability matters almost as much as performance.
Price and Value
I do not always go for the cheapest option. Instead, I look for the best value. In my experience, a slightly more expensive adapter is worth it if it offers better compatibility, stronger build quality, and dependable support.
Final Thoughts
When I choose a USB C to Serial adapter, I focus on compatibility, reliability, and build quality. If I keep those points in mind, I usually end up with an adapter that works well and saves me time. For me, the best choice is one that fits my device, my workflow, and my budget.
Final Thoughts
I’ve found that USB C to serial adapters are a simple but powerful way to keep modern devices working with older serial equipment. My key takeaway is that choosing the right adapter depends on compatibility, driver support, and the specific serial standard you need. When I pick a quality adapter, it saves me time, avoids connection issues, and makes troubleshooting much easier.
Author Profile
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Sara Wright is the writer behind Patrice J Bridal, a welcoming space created for anyone curious about the traditions, preparations, and meaningful details behind weddings. Before starting the blog in 2025, Sara spent several years working with event coordination teams at regional venues, where she witnessed hundreds of weddings come together.
Those experiences sparked her curiosity about the stories, customs, and decisions that shape such special celebrations. Today she writes from her quiet lakeside town, sharing helpful insights in a friendly and easy to understand way. Through Patrice J Bridal, Sara hopes to make wedding traditions feel clearer, more approachable, and enjoyable to explore for every reader.
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