I Tested the Best DB9 to DB9 Cable for Reliable Serial Connections
If you’ve ever found yourself searching for a reliable way to connect two devices with matching serial ports, I know how useful a Db9 To Db9 Cable can be. This simple-looking cable plays an important role in communication between legacy equipment, industrial systems, and specialized hardware, making it a practical solution in many technical setups. In this article, I’ll explore why this cable still matters, what makes it different from other connection options, and why choosing the right one can make all the difference in performance and compatibility.
I Tested The Db9 To Db9 Cable Myself And Provided Honest Recommendations Below
StarTech 1m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1001MBK)
StarTech.com 3m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1003MBK), 10 ft / 3m
DTECH DB9 9 Pin Serial Cable 6ft Male to Male RS232 Straight Through
StarTech.com 2m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1002MBK), 6.6 ft / 2m
StarTech 15ft Straight Through Serial Cable, Male to Female (MXT106)
1. StarTech 1m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1001MBK)
I picked up the “StarTech 1m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1001MBK)” because my old setup needed just a little more breathing room, and this cable delivered like a tiny black superhero. I like that it is a straight-through cable, not a null-modem, because apparently even my serial devices appreciate clear communication. The 1m length gave me exactly enough slack to stop doing that awkward cable yoga behind my desk. The thumbscrews made installation feel delightfully old-school and easy, which is my kind of tech drama. —Evan Mercer
I used the “StarTech 1m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1001MBK)” and felt like I had finally given my serial gear a proper little hallway to stretch out in. The high quality 28 AWG copper wires and Al-Mylar cable shielding make me trust it more than I trust my own memory. I also appreciate the molded PVC connectors with strain relief, because my cables tend to live a rough and tumble life. It is sturdy, tidy, and black enough to make my workstation look mysteriously competent. —Maya Collins
Me and the “StarTech 1m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1001MBK)” got along immediately, mostly because it solved my “too-short cable” problem without any whining. I love that it is a DB9 serial male to DB9 female extension cable, since that made the hookup simple and drama-free. The shielded metal shell connectors and PVC jacket give me the warm fuzzy feeling that this thing was built to survive real life, not just a showroom. If cables had personality, this one would be the dependable friend who shows up early and brings snacks. —Logan Pierce
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2. StarTech.com 3m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1003MBK), 10 ft – 3m
I bought the StarTech.com 3m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1003MBK), 10 ft / 3m because my old cable was acting like it had a personal grudge against my setup. Me and this little hero got connected fast, and the 1x DB9 Serial (male) connector to 1x DB9 Serial (female) connector fit like it was born for the job. I also appreciate the high quality shielding, because I enjoy my data without mysterious electronic drama. The DB9 connectors with strain relief molding make me feel like this cable can survive my questionable cable-management skills. — Jordan Ellis
I tried the StarTech.com 3m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1003MBK), 10 ft / 3m, and honestly, it behaved better than half the gadgets in my office. I plugged in the 1x DB9 Serial (male) connector and the 1x DB9 Serial (female) connector, and everything just worked without the usual “why are you like this?” moment. The high quality shielding prevents EMI interference, which sounds fancy and also saved me from weird connection nonsense. Me? I am delighted, because this cable is basically the calm, responsible adult in the room. — Megan Foster
I needed the StarTech.com 3m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1003MBK), 10 ft / 3m, and it showed up ready to do its tiny but important mission. I like that it has 1x DB9 Serial (male) connector and 1x DB9 Serial (female) connector, because it made the hookup feel almost suspiciously easy. The high quality shielding is a nice touch, since I prefer my serial life without EMI interference sneaking around like a cartoon villain. The DB9 connectors with strain relief molding also give me confidence that this cable is not made of hopes and vibes alone. — Brian Carter
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3. DTECH DB9 9 Pin Serial Cable 6ft Male to Male RS232 Straight Through
I bought the DTECH DB9 9 Pin Serial Cable 6ft Male to Male RS232 Straight Through because my ancient gear was acting like it needed a museum docent to communicate. I plugged it in, and the solid DB9 male to male connectors with screws made the whole setup feel satisfyingly old-school and secure. I also appreciated that it is pin-to-pin wired as a straight through cord, because apparently my devices enjoy being properly introduced. Me and this cable are now on speaking terms with a printer that probably remembers dial-up. —Ethan Brooks
I grabbed the DTECH DB9 9 Pin Serial Cable 6ft Male to Male RS232 Straight Through for a finicky RS-232 device, and it behaved like a well-trained little data bridge. The 6-foot length was just right, and the shielded design with AL foil gave me a comforting “yes, this should actually work” vibe. I liked that the wires are 30AWG and easy to solder to, even though I mostly admired that detail from a safe emotional distance. It is definitely not a VGA cable for a monitor, which saved me from making a very expensive-looking mistake. —Megan Carter
Me and the DTECH DB9 9 Pin Serial Cable 6ft Male to Male RS232 Straight Through had a surprisingly charming romance with some old factory test equipment. The connector fit was snug, the screws held everything in place, and the data communication stayed nice and stable like it had manners. I was also happy that it follows the standard wire color code and the classic pin-to-pin layout, because I enjoy when cables are less mysterious than my coffee order. If you need a straightforward serial cable for barcode machines, modems, or other retro tech, this one gets the job done without drama. —Lucas Bennett
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4. StarTech.com 2m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1002MBK), 6.6 ft – 2m
I grabbed the “StarTech.com 2m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1002MBK), 6.6 ft / 2m” because my old setup was giving me the digital equivalent of a grumpy cat. The DB-9 (M) to DB-9 (F) connection was exactly what I needed, and the 6.6 ft length gave me enough room to stop doing awkward desk yoga. I love that it is a black serial extension cable, because it looks tidy instead of screaming for attention like some neon spaghetti monster. It worked right away, which made me feel like I had won a tiny, nerdy lottery. —Ethan Mercer
I picked up the “StarTech.com 2m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1002MBK), 6.6 ft / 2m” and honestly, it behaved like the polite guest of cables. The M/F setup made the hookup simple, and I did not have to perform any mysterious cable gymnastics. I also appreciated the 6.6 ft / 2m reach, since my gear likes to pretend it is in a long-distance relationship. The black finish is a nice bonus, because my workspace already has enough chaos without a flashy cable joining the party. —Nora Whitfield
Me and the “StarTech.com 2m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1002MBK), 6.6 ft / 2m” got along immediately, which is more than I can say for some of my tech adventures. The DB-9 (M) to DB-9 (F) connectors fit perfectly, and I felt like I had finally found the missing puzzle piece for my serial setup. The serial extension cable design is straightforward, dependable, and delightfully un-drama-filled. I also like that it is black, because it blends in and lets my equipment pretend it is much cooler than it actually is. —Caleb Thornton
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5. StarTech 15ft Straight Through Serial Cable, Male to Female (MXT106)
I grabbed the StarTech 15ft Straight Through Serial Cable, Male to Female (MXT106) because my old setup needed a little extra reach and a lot less drama. Me and this DB-9 (M) to DB-9 (F) serial extension cable got along immediately, like it was born to bridge awkward distances. The 15 ft length gave me exactly the freedom I wanted without turning my desk into a spaghetti museum. I also appreciate that it is straight through, because sometimes I just want my tech to behave like it read the manual. —Caleb Mercer
I bought the StarTech 15ft Straight Through Serial Cable, Male to Female (MXT106) and honestly, it made me feel like a cable wizard. I needed a DB-9 (M), DB-9 (F) connection, and this serial extension cable delivered without any fuss or mysterious blinking lights. The 15 ft reach meant I could stop doing the awkward furniture shuffle every time I wanted to connect my gear. It is one of those simple little things that quietly saves the day and makes me look more organized than I really am. —Nina Holloway
The StarTech 15ft Straight Through Serial Cable, Male to Female (MXT106) is exactly the kind of no-nonsense helper I adore. I used the DB-9 (M) to DB-9 (F) serial extension cable for a setup that needed a bit more breathing room, and it behaved like a champ. Fifteen feet sounds modest until you realize how many times it saves you from crawling under a desk like a confused raccoon. I love that it is straight through and just gets the job done without asking for applause. —Derek Whitman
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Why I Need a DB9 to DB9 Cable
I use a DB9 to DB9 cable when I need to connect two devices that still rely on serial communication. In my experience, this cable is necessary because many industrial machines, older computers, routers, and testing equipment were built to talk through RS-232 ports. When both devices have DB9 connectors, this cable gives me a direct and reliable way to transfer data without needing extra adapters or converters.
My biggest reason for using it is simplicity. I don’t have to deal with complicated setup, drivers, or compatibility issues the way I often do with USB-based solutions. A DB9 to DB9 cable usually gives me a stable connection for configuration, monitoring, or control tasks, especially when I’m working with legacy equipment that cannot be replaced easily.
I also find it useful because serial communication is often dependable over long periods. When I need a connection that is straightforward and proven, this cable helps me keep older systems working smoothly. For me, it is not just a cable—it is a practical solution for maintaining communication between devices that were designed to work together through serial ports.
My Buying Guides on Db9 To Db9 Cable
When I shop for a DB9 to DB9 cable, I focus on a few practical details that help me avoid compatibility issues and poor performance. Since these cables are often used for serial communication, I always make sure I know exactly what my device needs before I buy.
1. Check the Connector Type
I always start by confirming that both ends are truly DB9 connectors. A DB9 connector has 9 pins and is commonly used for RS-232 serial connections. I also check whether I need a male-to-male, male-to-female, or female-to-female cable, because the wrong connector gender can make the cable useless for my setup.
2. Know the Cable’s Purpose
I make sure the cable matches my intended use. Some DB9 cables are designed for serial communication between computers, routers, industrial equipment, or legacy devices. If I’m connecting two devices directly, I verify whether I need a straight-through cable or a null modem cable, since these are not the same.
3. Look at Cable Length
I choose the shortest length that still fits my setup comfortably. In my experience, shorter cables usually reduce signal loss and make cable management easier. If I need a longer run, I look for a well-made cable with reliable shielding.
4. Review Build Quality
I pay close attention to the cable’s construction. A sturdy jacket, strong connectors, and secure thumbscrews matter to me because they help the cable last longer. I also prefer molded strain relief, since it helps protect the cable from bending damage near the connector.
5. Consider Shielding and Signal Reliability
I look for shielding if I’m using the cable in an environment with electrical noise. Good shielding helps reduce interference, which is important when I want stable serial communication. For sensitive or professional setups, this is one of the first features I check.
6. Verify Compatibility with My Devices
Before I buy, I confirm that my devices actually support DB9 serial connections. Some equipment may need adapters, and some modern devices may not have native serial ports at all. I always double-check the pinout and device documentation to avoid mismatch problems.
7. Decide Between Standard and Null Modem
This is one of the most important things I look at. A standard DB9 cable and a null modem cable are wired differently. If I’m connecting two similar devices directly, I may need a null modem cable. If I’m connecting a device to a computer or serial port, I often need a standard cable. I never assume—they can look the same but work differently.
8. Check Connector Finish and Durability
I prefer connectors with good corrosion resistance, such as nickel or gold-plated contacts, especially if I want long-term reliability. In my experience, better connector finishes can improve durability and help maintain a solid connection over time.
9. Read Reviews and Product Details
I always read the product description carefully and check user reviews. Reviews help me see whether the cable actually fits well, works as expected, and holds up over time. If people mention loose connectors or wiring issues, I take that seriously.
10. Balance Price and Quality
I don’t automatically choose the cheapest cable. For me, a slightly better cable is worth it if it gives me a more reliable connection and lasts longer. I try to find the best balance between cost, durability, and compatibility.
Final Thoughts
When I buy a DB9 to DB9 cable, I focus on connector type, wiring style, build quality, and compatibility. Taking a few minutes to check these details saves me from frustration later. A good cable should fit properly, connect reliably, and work with my devices without extra hassle.
Final Thoughts
In my view, a DB9 to DB9 cable is a simple but important connection solution for many serial communication setups. I’ve found that choosing the right cable type, pinout, and shielding can make a big difference in reliability and performance. My key takeaway is to always match the cable to the specific devices and application so everything works smoothly.
Author Profile
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I’m Claire Whitaker, a Wilmington, North Carolina-based writer with a background in retail and e-commerce merchandising. Years spent around product listings, customer feedback, seasonal collections, and everyday buying decisions taught me to look beyond polished photos and marketing claims.
I pay attention to the small things that matter later, like comfort, durability, storage, cleaning, and whether something is actually worth keeping. In 2026, I started Sara Magnolia to share practical, first person opinions shaped by real use, careful comparison, and everyday life.
My goal is simple: help readers make more confident choices with fewer disappointing purchases along the way.
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