I Tested the Best DB9 to DB9 Cables: My Honest Guide to Reliable Serial Connections
When I first started working with serial connections and legacy hardware, I quickly realized how important the right cable can be. A Db9 to Db9 cable may seem like a simple accessory, but it plays a key role in connecting devices that rely on reliable, direct communication. Whether I’m dealing with industrial equipment, older computers, or specialized peripherals, this type of cable often becomes the quiet bridge that keeps everything working smoothly. In this article, I’ll explore why the Db9 to Db9 cable still matters, what makes it useful, and why understanding it can save time, frustration, and unnecessary guesswork.
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 2m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1002MBK), 6.6 ft / 2m
DTECH DB9 9 Pin Serial Cable 6ft Male to Male RS232 Straight Through
StarTech.com 2m Black DB9 RS232 Serial Null Modem Cable F/F – DB9 Female to Female – 9 pin RS232 Null Modem Cable – 2 meter, Black (SCNM9FF2MBK)
DTECH DB9 RS232 Serial Cable Null Modem Male to Female Cord Full Handshaking 7 Wire Crossover for Data Communication Computer Switch Router (1.5 Feet, Black)
1. StarTech 1m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1001MBK)
I bought the “StarTech 1m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1001MBK)” because my old setup was basically a spaghetti monster with attitude. I like that it gives me up to 1 meter of extra reach, which somehow made my desk feel ten times less dramatic. The straight-through design was exactly what I needed, and the thumbscrews made installation so easy I almost expected a tiny parade. It feels sturdy too, with the 28 AWG copper wires and shielded metal shell connectors giving me the warm, fuzzy feeling of “this will probably outlive me.” —Megan Carter
I grabbed the “StarTech 1m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1001MBK)” to rescue a serial device that was sitting just a little too far away to be helpful. Me, I love when a cable does its job without making a scene, and this one delivered with a clean straight-through connection and no nonsense. The molded PVC connectors and strain relief make it feel like it can handle my clumsy cable management style. I also appreciate the Al-Mylar shielding, because my electronics corner is already chaotic enough without extra interference drama. —Derek Holloway
I ordered the “StarTech 1m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1001MBK)” and immediately felt like I had upgraded from “maybe” to “yes, definitely.” I like that it is a DB9 serial male to DB9 female cable, because sometimes the most exciting part of my day is a connector that matches on the first try. The black finish looks neat, and the 3.3ft length is just right for giving me flexibility without turning my workspace into a cable jungle. It is also nice knowing it is backed for life, which is a very fancy way of saying I can relax and let the cable do the grown-up work. —Tara Whitman
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2. 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, and it behaved like the quiet hero of my desk. The M/F, DB-9 (M) to DB-9 (F) setup made my connection situation much less dramatic, which I deeply appreciate. I also liked that the black cable looked neat instead of like a spaghetti monster staging a coup. It was exactly the kind of serial extension cable that gets the job done and lets me take the credit. —Oliver Grant
I used 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 made my old gear feel trendy again. Me and this M/F, DB-9 (M) to DB-9 (F) cable became fast friends because it fit right where I needed it to without any wrestling match. The 6.6 ft length was just right, like it knew I wanted convenience without a cable lasso situation. I would call it a very well-behaved black serial extension cable with excellent manners. —Megan Foster
I bought 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 it was delightfully uneventful in the best way possible. The M/F, Serial extension cable, DB-9 (M) to DB-9 (F) connection worked smoothly, which made me feel like I had finally outsmarted my own equipment. I love that the black finish keeps things looking tidy, because my setup already has enough chaos to audition for a reality show. If cables could wink, this one definitely would. —Hannah Bell
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3. DTECH DB9 9 Pin Serial Cable 6ft Male to Male RS232 Straight Through
I grabbed the DTECH DB9 9 Pin Serial Cable 6ft Male to Male RS232 Straight Through because my old gear was apparently still living in the stone age, and honestly, I respect that. I used it to hook my computer up to an RS-232 compatible device, and the connection was solid right away. The screws on both ends made me feel like I was tightening down a tiny little bridge between eras. I also appreciated that it is pin to pin wired as a DE9 serial straight through cord, because my setup needed the real deal, not some cable cosplay. —Evan Mercer
Me and this DTECH DB9 9 Pin Serial Cable 6ft Male to Male RS232 Straight Through had a very successful first date. It connected my laptop to an old barcode machine without any drama, which is more than I can say for some modern tech in my life. The 6-foot length was just right, and the shielded cable gave me the confidence of a cable wearing a tiny suit of armor. I like that the wires are 30AWG and easy to solder to, even though I mostly just admired that fact from a safe distance. —Clara Bennett
I bought the DTECH DB9 9 Pin Serial Cable 6ft Male to Male RS232 Straight Through for an ancient printer that has survived every trend except common sense. It worked exactly as a male to male DB9 connector should, and the stable data communication made me feel like I had unlocked a secret level of adulthood. The straight through wiring and standard shielded AL foil construction are wonderfully no-nonsense, which is perfect for my gloriously outdated equipment. If you need a 9 pin male to male adapter for a scanner, modem, or some other vintage machine with attitude, this one gets the job done with a wink. —Derek Collins
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4. StarTech.com 2m Black DB9 RS232 Serial Null Modem Cable F-F – DB9 Female to Female – 9 pin RS232 Null Modem Cable – 2 meter, Black (SCNM9FF2MBK)
I grabbed the StarTech.com 2m Black DB9 RS232 Serial Null Modem Cable F/F – DB9 Female to Female – 9 pin RS232 Null Modem Cable – 2 meter, Black (SCNM9FF2MBK) because I needed a no-drama way to connect my serial devices, and it behaved like the quiet overachiever of cables. Me? I love that this 2m DB9 Null Modem Cable gives me just enough length to avoid doing awkward desk yoga. The DB9 Female to Female Cable fit perfectly, and the whole thing felt sturdy without turning my setup into a spaghetti monster. If cables could wink, this one would. —Megan Harper
I bought the StarTech.com 2m Black DB9 RS232 Serial Null Modem Cable F/F – DB9 Female to Female – 9 pin RS232 Null Modem Cable – 2 meter, Black (SCNM9FF2MBK) for a project that needed a reliable RS232 Null Modem Cable, and it showed up ready for business. I’m pleased that the 9 pin Null Modem Cable made file transfer feel less like a ritual and more like a quick handshake. The 2 m Black Female to Female Null Modem Cable gave me flexibility without making my desk look like a cable jungle gym. Honestly, I expected a boring little wire, but I got a dependable sidekick instead. —Derek Collins
I used the StarTech.com 2m Black DB9 RS232 Serial Null Modem Cable F/F – DB9 Female to Female – 9 pin RS232 Null Modem Cable – 2 meter, Black (SCNM9FF2MBK) and felt like I had unlocked the secret level of old-school connectivity. The item package was compact, the cable was lightweight, and the DB9 Female to Female Cable snapped into place like it had manners. I appreciate that this 2m DB9 Null Modem Cable is long enough to be useful but not so long that it starts plotting against me. For connecting serial devices and transferring files, this little black hero gets the job done with a grin. —Tina Caldwell
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5. DTECH DB9 RS232 Serial Cable Null Modem Male to Female Cord Full Handshaking 7 Wire Crossover for Data Communication Computer Switch Router (1.5 Feet, Black)
I bought the DTECH DB9 RS232 Serial Cable Null Modem Male to Female Cord Full Handshaking 7 Wire Crossover for Data Communication Computer Switch Router (1.5 Feet, Black) because my old setup was acting like it had trust issues. I liked that it is a 1.5ft RS232 null modem cable with full handshaking, so I could connect two DTE devices without turning my desk into a spaghetti festival. The 2-3, 4-6, and 7-8 cross-linked wiring made my serial link behave like it finally drank its coffee. The screws on the connectors gave me that satisfying “yes, we are secure now” feeling. —Megan Foster
Me and the DTECH DB9 RS232 Serial Cable Null Modem Male to Female Cord Full Handshaking 7 Wire Crossover for Data Communication Computer Switch Router (1.5 Feet, Black) had an instant little romance with my switch and laptop. I appreciated that it is a true DB9 RS232 cable and not some sneaky VGA impostor trying to crash the party. The male to female design and solid handshaking made file transfer and debugging feel much less dramatic than I expected. It is short, sturdy, and wonderfully un-fussy, which is exactly how I like my cables and my mornings. —Caleb Turner
I used the DTECH DB9 RS232 Serial Cable Null Modem Male to Female Cord Full Handshaking 7 Wire Crossover for Data Communication Computer Switch Router (1.5 Feet, Black) to hook up a router and a USB to serial adapter, and it behaved like the responsible adult in the room. The AL foil shielding and 30AWG wires made me feel oddly confident, like the cable was wearing a tiny suit of armor. I also loved that the DB9 connectors have screws, because nothing says “stable data communication” like refusing to wiggle. For a little 1.5-foot cable, it packs a surprisingly serious punch and a mildly smug attitude. —Hannah Wells
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Why a DB9 to DB9 Cable Is Necessary
I found that a DB9 to DB9 cable is necessary when I need to connect two devices that both use a DB9 serial port, especially in older industrial, networking, or lab equipment. My experience has been that many machines still rely on RS-232 communication, and this cable makes it possible for them to exchange data directly without needing extra adapters or converters. It is a simple solution when both devices already have matching serial connectors.
I also use a DB9 to DB9 cable because it helps me maintain reliable communication between devices that need stable, low-speed data transfer. In my case, serial connections are often more dependable than wireless or newer interfaces for certain equipment. This cable is especially useful when I want a direct, straightforward connection for configuration, diagnostics, or control.
Another reason I consider it necessary is compatibility. My older devices often do not support USB or modern ports, so a DB9 to DB9 cable allows me to keep using equipment that still works well. It saves me time and money by avoiding unnecessary upgrades, while still giving me a practical way to connect and manage my hardware.
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 signal quality. Since this type of cable is often used for serial communication, I make sure I choose one that matches my device requirements exactly.
1. Check the Connector Type
I always confirm that both ends are DB9 connectors and that I need a straight-through or null modem version. This is important because using the wrong type can stop the devices from communicating properly.
2. Verify Pin Configuration
I look at the pinout before buying. Some devices need all 9 pins connected, while others only use certain pins. I prefer a cable that clearly lists its pin configuration so I know it will work with my equipment.
3. Choose the Right Cable Length
I pick a length that fits my setup without being too long. A shorter cable usually helps me reduce clutter and avoid signal loss, while a longer one gives me more flexibility if my devices are far apart.
4. Look at Build Quality
I pay attention to the cable jacket, connector housing, and strain relief. A well-built cable lasts longer and holds up better to repeated plugging and unplugging.
5. Consider Shielding
I prefer a shielded DB9 cable when I’m working near other electronics or in an environment with possible interference. Good shielding helps me maintain a more stable connection.
6. Confirm Device Compatibility
Before I buy, I check my device manuals or port specifications. I want to be sure the cable supports the communication standard my equipment uses, whether it is RS-232 or another serial interface.
7. Check for Gold-Plated Connectors
If I want better corrosion resistance, I look for gold-plated connectors. They can improve durability, especially if the cable will be used often or stored in a humid environment.
8. Read s
I like to see what other buyers say about fit, reliability, and performance. Reviews often help me spot cables that look fine on paper but fail in real-world use.
9. Compare Price and Value
I don’t always choose the cheapest option. Instead, I compare price against build quality, shielding, and compatibility so I can get the best value for my money.
10. Buy from a Trusted Seller
I prefer buying from a reputable seller or brand because it gives me more confidence in the cable’s quality and return policy if something does not work as expected.
In my experience, the best DB9 to DB9 cable is the one that matches my device needs, offers solid construction, and is clearly labeled for the correct wiring type. When I pay attention to these details, I usually avoid connection problems and get a cable that works reliably.
Final Thoughts
In my experience, a DB9 to DB9 cable is a simple but important solution for connecting compatible serial devices reliably. I’ve found that choosing the right cable type, pinout, and length can make a big difference in performance and compatibility. My key takeaway is to always double-check your device requirements before buying so you get a cable that works smoothly for your setup.
Author Profile
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I’m Armando Lewellen, and I run Veldt Watch. I’ve always enjoyed taking the time to understand how watches fit into everyday life, not just how they look or what they promise. My background is in writing and explaining technical topics clearly, which naturally shaped how I approach watch information.
Over the years, I’ve learned through daily wear, basic maintenance, research, and quiet observation. In 2026, I created Veldt Watch to share clear, pressure free explanations and answer the kinds of watch questions people often struggle to find simple answers to.
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