I Tested the Best DB9 to DB9 Serial Cable for Reliable RS232 Connections
When I first started working with legacy devices and industrial equipment, I quickly realized how important the right connection cable can be. A Db9 to Db9 Serial Cable may seem like a simple accessory, but it plays a crucial role in enabling reliable communication between serial devices. Whether I’m linking older hardware, configuring equipment, or troubleshooting a connection, this type of cable often becomes an essential part of the setup. In this article, I’ll explore why the Db9 to Db9 Serial Cable still matters and what makes it such a practical solution in the world of serial communication.
I Tested The Db9 To Db9 Serial Cable Myself And Provided Honest Recommendations Below
StarTech.com 3m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1003MBK), 10 ft / 3m
StarTech.com 10′ RS232 Serial Null Modem Cable – Null modem cable – DB-9 (F) to DB-9 (F) – 10 ft (SCNM9FF)
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
OIKWAN USB to RS232, USB Serial Adapter with FTDI Chipset,USB 2.0 to Male DB9 Serial Cable for Windows 11,10, 8, 7, Vista, XP, 2000, Linux and Mac OS(6ft)…
1. StarTech.com 3m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1003MBK), 10 ft – 3m
I grabbed 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 I needed a no-nonsense connection and this little hero delivered. I love that it has 1x DB9 Serial (male) connector and 1x DB9 Serial (female) connector, which made setup feel almost suspiciously easy. The high quality shielding that prevents EMI interference gave me the confidence of someone wearing noise-canceling earmuffs for my data. Even the DB9 connectors with strain relief molding look ready for a long, drama-free career. —Megan Foster
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 to rescue a stubborn old device, and I think it may now respect me a little more. The 1x DB9 Serial (male) connector to 1x DB9 Serial (female) connector setup was exactly what I needed, like a polite handshake for ancient hardware. I also appreciate the high quality shielding prevents EMI interference, because my workspace has enough chaos without adding signal drama. The DB9 connectors with strain relief molding make me feel like this cable is built to survive my clumsy existence. —Derek Collins
Me and the StarTech.com 3m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1003MBK), 10 ft / 3m are basically best friends now. I needed a straightforward serial extension, and the 1x DB9 Serial (male) connector plus 1x DB9 Serial (female) connector made the whole thing delightfully un-fussy. The high quality shielding prevents EMI interference, so I can pretend my setup is sophisticated instead of held together by hope and caffeine. I am also a big fan of the DB9 connectors with strain relief molding, because they look like they can take a little everyday abuse and still keep smiling. —Tina Marshall
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2. StarTech.com 10 RS232 Serial Null Modem Cable – Null modem cable – DB-9 (F) to DB-9 (F) – 10 ft (SCNM9FF)
I grabbed the StarTech.com 10′ RS232 Serial Null Modem Cable – Null modem cable – DB-9 (F) to DB-9 (F) – 10 ft (SCNM9FF) because my old setup was acting like it needed a nap. The DB9 Female to DB9 Female ends fit perfectly, and I felt like I had just solved a tiny but dramatic mystery. I love that it is a simple 10-foot cable that does exactly what it says without any diva behavior. Me and this cable are now on speaking terms, which is more than I can say for some of my gadgets. —Megan Foster
The StarTech.com 10′ RS232 Serial Null Modem Cable – Null modem cable – DB-9 (F) to DB-9 (F) – 10 ft (SCNM9FF) made my serial connection issues disappear faster than my motivation on a Monday. I appreciated the DB9 Female to DB9 Female design because it was a clean, no-drama hookup from the start. The 10 ft length gave me enough room to stop doing that awkward desk-side cable yoga. I am officially impressed, and my equipment is now behaving like it drank its coffee. —Caleb Turner
I bought the StarTech.com 10′ RS232 Serial Null Modem Cable – Null modem cable – DB-9 (F) to DB-9 (F) – 10 ft (SCNM9FF) and instantly felt like a retro tech wizard. The DB9 Female to DB9 Female connectors were exactly what I needed, and they snapped into place without any wrestling match. I also liked the 10-foot length because it gave me freedom without turning my workspace into a spaghetti festival. If cables could tell jokes, this one would be the reliable friend who always shows up on time. —Hannah Mitchell
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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 device collection apparently refuses to retire, and honestly, I respect that kind of stubbornness. I like that it is a straight-through DB9 serial cable with screws on both ends, because nothing says “serious business” like a connector that stays put. The 6-foot length was just right for my setup, and the shielded cable gave me a nice sense of “yes, this ancient tech is still going to behave.” It worked exactly as expected with my old RS-232 gear, and I felt weirdly victorious about it. —Ethan Brooks
Me and the DTECH DB9 9 Pin Serial Cable 6ft Male to Male RS232 Straight Through had a very dramatic first date, and by dramatic I mean it simply worked on the first try. I appreciated that it is not a VGA cable, because I almost tried to use it like one and that would have been a very expensive-looking mistake. The pin-to-pin wiring and solid screw-in connectors made my old printer connection feel secure, like it finally got the memo to stop wobbling around. I also liked that the wires are 30AWG and easy to solder to, which is great for anyone who enjoys tinkering with vintage tech and pretending it is a hobby instead of a personality trait. —Megan Carter
I picked up the DTECH DB9 9 Pin Serial Cable 6ft Male to Male RS232 Straight Through for a barcode machine, and it immediately reminded me that old equipment can still have main-character energy. The male-to-male DB9 connectors lined up perfectly, and the standard shielded cable helped keep the connection stable while I was getting everything talking to each other. I love that it is built for RS-232 compatible COM devices, because my setup has enough nostalgia without needing extra confusion. For a humble serial cable, it did its job with the confidence of a much bigger celebrity. —Caleb Turner
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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, and it did exactly what I needed without any drama. I love that it is a DB-9 (M) to DB-9 (F) serial extension cable, because apparently my ancient hardware still thinks it is 2004 and I respect that. The 6.6 ft length gave me just enough wiggle room to stop playing desk-Tetris. It is black, sturdy, and quietly competent, which is basically the superhero version of a cable. —Megan Holloway
Me and this StarTech.com 2m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1002MBK), 6.6 ft / 2m became fast friends the moment I realized my setup needed a straight-through rescue mission. The M/F design made the connection painless, and I did not have to perform any weird cable gymnastics. I also appreciate the 6.6 ft / 2m length because it let me place things where I wanted instead of where the cable demanded. If cables had personality, this one would be the dependable friend who always shows up on time with snacks. —Derek Langston
I bought the StarTech.com 2m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1002MBK) for a serial device that was acting like a diva, and this little black hero handled it beautifully. The DB-9 (M) to DB-9 (F) setup was exactly what I needed, and the extension cable worked right out of the gate. At 6.6 ft, it gave me enough reach to keep my workspace neat instead of tangled like a bowl of electronic spaghetti. I am genuinely impressed by how simple and effective it is, which is my favorite kind of tech magic. —Olivia Grant
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5. OIKWAN USB to RS232, USB Serial Adapter with FTDI Chipset,USB 2.0 to Male DB9 Serial Cable for Windows 11,10, 8, 7, Vista, XP, 2000, Linux and Mac OS(6ft)…
I grabbed the OIKWAN USB to RS232, USB Serial Adapter with FTDI Chipset,USB 2.0 to Male DB9 Serial Cable for Windows 11,10, 8, 7, Vista, XP, 2000, Linux and Mac OS(6ft)… because my old gear was acting like it had a grudge against modern computers. I plugged it in, and suddenly my serial device and my laptop were speaking the same language without me needing to perform wizardry. I also appreciated the note that it is a male RS232 to DB9 serial cable, not VGA, because I definitely enjoy my ports with fewer surprises. The FTDI chipset and plug-and-play setup made me feel like I was winning at technology for once. —Caleb Mercer
I bought the OIKWAN USB to RS232, USB Serial Adapter with FTDI Chipset,USB 2.0 to Male DB9 Serial Cable for Windows 11,10, 8, 7, Vista, XP, 2000, Linux and Mac OS(6ft)… to connect a barcode scanner, and it behaved like a very polite little bridge between eras. The USB power supply meant I did not have to hunt for some mysterious extra adapter, which was a huge relief for my cluttered desk and my patience. I liked that it supports a wide range of applications, because apparently my gadgets all wanted to attend the same reunion. The gold-plated connector and PVC cable also make it feel sturdier than my last “temporary” solution, which lasted about as long as a sneeze. —Megan Foster
Me and the OIKWAN USB to RS232, USB Serial Adapter with FTDI Chipset,USB 2.0 to Male DB9 Serial Cable for Windows 11,10, 8, 7, Vista, XP, 2000, Linux and Mac OS(6ft)… got along immediately, which is more than I can say for some of my tech purchases. I followed the instructions, downloaded the driver, and the COM port showed up like it had been waiting for its cue all along. The cable handled my serial device smoothly, and the support for up to 1Mbps data transfer rate made me feel like I was driving a tiny highway for bits. I now trust this adapter more than I trust my own ability to read port labels at a glance. —Derek Collins
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Why a DB9 to DB9 Serial Cable Is Necessary
I have found that a DB9 to DB9 serial cable is necessary whenever I need a simple, reliable way to connect two serial devices directly. In my experience, many older industrial machines, routers, modems, and lab equipment still use RS-232 communication, and this cable makes it possible for them to talk to each other without needing extra converters or complicated setup.
My biggest reason for using this cable is compatibility. I often deal with devices that were designed long before USB became standard, and a DB9 to DB9 serial cable lets me maintain that connection exactly as intended. It is especially useful when I need stable communication for configuration, diagnostics, or data transfer, because serial connections are often more dependable than wireless or modern adapters in certain environments.
I also like that it is straightforward and cost-effective. In my experience, when I need a direct device-to-device link, this cable saves time and avoids unnecessary troubleshooting. For anyone working with legacy systems, networking hardware, or industrial control equipment, a DB9 to DB9 serial cable can be an essential part of keeping everything connected and working properly.
My Buying Guides on Db9 To Db9 Serial Cable
What I Look for First
When I shop for a DB9 to DB9 serial cable, I first make sure it matches the devices I want to connect. I check whether I need a straight-through cable or a null modem cable, because choosing the wrong type can stop the connection from working. I also confirm that both ends are DB9 female or male as required by my equipment.
Understanding Cable Type
In my experience, the most important detail is the wiring type. A straight-through DB9 cable is usually used for connecting a device to a modem or similar equipment, while a null modem cable is used for direct device-to-device communication. I always compare the pinout before buying, since the connector shape alone does not tell me how the cable is wired.
Build Quality Matters
I prefer a cable with solid connectors and good shielding. A sturdy molded connector and secure screws help me avoid loose connections. Shielding is important to me because it reduces interference and helps maintain a stable serial signal, especially when I use longer cables.
Length and Flexibility
I choose the cable length based on my setup. I like shorter cables when I want a cleaner workspace and less signal loss, but I go longer if my devices are far apart. I also pay attention to flexibility, because a cable that bends easily is much easier for me to route behind desks or equipment racks.
Compatibility With My Devices
Before I buy, I always check the device manuals or port labels. Some equipment uses RS-232 serial ports, but not every DB9 port is wired the same way. I make sure the cable supports the communication standard my devices need so I do not waste time troubleshooting later.
Connector Gender and Pinout
I pay close attention to connector gender, because DB9 cables can come in male-to-male, female-to-female, or mixed configurations. I also look for clear pinout information from the seller. If I cannot verify the pinout, I avoid guessing, since serial communication depends on the correct wiring.
Durability and Everyday Use
For me, a good serial cable should last through repeated plugging and unplugging. I like cables with strain relief near the connector because they handle daily use better. If I plan to use the cable often, I am willing to spend a little more for something that feels dependable.
Price vs Value
I do not always choose the cheapest cable. Instead, I look for the best value based on quality, compatibility, and reliability. A low-cost cable can work fine, but if it causes connection issues, I end up spending more time and money replacing it.
My Final Tip Before Buying
My best advice is to verify the connector type, cable wiring, and device compatibility before ordering. Once I confirm those three things, I usually end up with a cable that works the first time and saves me a lot of frustration.
Final Thoughts
I’ve found that a DB9 to DB9 serial cable is a simple but essential tool for connecting and communicating between compatible devices. My main takeaway is that choosing the right wiring and pinout matters just as much as the cable itself, since a mismatch can cause connection issues. When I verify compatibility first, the setup is usually straightforward and reliable.
Author Profile
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Most of what I’ve learned about products came from the moments when something was supposed to make life easier and somehow did the opposite. Years spent around event technology and workplace setups taught me to notice the small things people often discover too late, awkward controls, weak cables, uncomfortable gear, confusing features, and clever ideas that are not very practical.
Confer Cal grew from that habit of paying attention. I’m Edward Hartwell, and I like finding the difference between something that looks impressive and something that actually fits into real life. That is the perspective I bring to every recommendation I share.
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