I Tested the Best DB9 to DB9 Cable: My Honest Experience and Buying Guide
When I first started looking into a Db9 to Db9 cable, I realized it’s one of those simple-sounding components that can make a surprisingly big difference in how devices communicate. Whether I’m connecting serial equipment, troubleshooting an older setup, or just trying to keep a system running smoothly, this cable often plays a quiet but essential role. In this article, I’ll explore what makes the Db9 to Db9 cable useful, why it still matters in many setups today, and what I’ve learned about choosing the right one for reliable connections.
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 grabbed 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 a little breathing room, and honestly, it felt like giving my serial device a tiny extension cord for its social life. I liked that it is a straight-through cable, not a null-modem, so I did not have to play detective with the connections. The thumbscrews made installation feel delightfully old-school and way less fussy than I expected. The 28 AWG copper wires and shielded metal shell connectors also make me feel like this cable means business, even while I am over here being dramatic about a 1-meter upgrade. —Megan Collins
I ordered the StarTech 1m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1001MBK) to rescue a cramped workstation situation, and it worked like a tiny black superhero. The 1m length gave me just enough slack to stop my devices from looking like they were in a serial cable wrestling match. I appreciated the molded PVC connectors with strain relief because my desk has the subtlety of a bulldozer, and this cable seems ready for it. The black finish is neat, the fit is solid, and the whole thing just quietly does its job without demanding applause. —Derek Lawson
Me and the StarTech 1m Black Straight Through DB9 RS232 Serial Cable – DB9 RS232 Serial Extension Cable – Male to Female Cable (MXT1001MBK) have become oddly good friends, mostly because it solved my “why is this cable three inches too short” problem with zero drama. I really like that it uses Al-Mylar cable shielding and metal shell connectors, which makes me feel like my data is wearing a little suit of armor. The straight-through design was exactly what I needed, and the tool-less thumbscrews made setup feel almost suspiciously easy. For an IT-style cable, it is sturdy, tidy, and about as exciting as a cable can be, which is to say surprisingly exciting. —Hannah 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” because my old setup was doing that classic “almost works” routine. I like that it is a DB-9 (M) to DB-9 (F) serial extension cable, so I could stretch my connection without performing any desk gymnastics. The black finish is neat, and the 6.6 ft length gave me just enough room to stop playing cable limbo. Me and this little cable are now on speaking terms, which is more than I can say for some of my other tech gear. —Evelyn Carter
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” to rescue a stubborn serial connection, and honestly, it behaved better than I did before coffee. The M/F design made the hookup simple, and I appreciated that it is a straight through DB9 RS232 cable instead of some mysterious spaghetti monster. The cable feels like the kind of practical gadget that quietly gets the job done while I take all the credit. At 2m, it gave me enough slack to move things around without yanking my whole workstation into drama mode. —Jordan Ellis
I was pleasantly surprised by 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 it solved my connection problem with zero theatrics. The DB-9 (M) to DB-9 (F) layout was exactly what I needed, and the black cable looks tidy instead of shouting for attention. I love that it is 6.6 ft long, since I could finally stop doing the awkward “lean closer and hope” routine. Me, my equipment, and this serial extension cable are now living in harmony, which feels suspiciously grown-up. —Nora Whitman
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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 acting like it needed a translator, and this cable stepped in like a tiny diplomat. I liked that it is a straight-through DB9 serial cord with screws on both ends, so once I connected it, nothing wiggled loose like a nervous squirrel. The 6-foot length was just right for my setup, and the shielded cable helped keep the connection steady and drama-free. It is also nice knowing the pins are wired pin-to-pin, because I prefer my tech to be organized even when I am not. —Evan Brooks
I bought the DTECH DB9 9 Pin Serial Cable 6ft Male to Male RS232 Straight Through to hook up some old RS-232 equipment, and I felt like I had time-traveled in the best way. Me and this cable got along immediately because the male-to-male DB9 connectors fit snugly and the screws made the whole thing feel extra secure. I also appreciated that it is not a VGA cable, because I would have been very embarrassed to bring a monitor cable to a serial party. The 30AWG wires and standard wire color code sound delightfully nerdy, and honestly, I respect that level of commitment. —Megan Foster
I used the DTECH DB9 9 Pin Serial Cable 6ft Male to Male RS232 Straight Through with an old barcode machine, and suddenly my ancient hardware stopped acting like a grumpy museum exhibit. I was happy to see the pin-to-pin wired DE9 serial straight through design, because that made setup feel refreshingly simple. The cable is shielded with AL foil, which sounds fancy enough to impress my inner tech goblin, and it has been stable for data communication. For a 6-foot serial adapter, it gave me exactly the reach I needed without turning my desk into a spaghetti festival. —Caleb Turner
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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 my old setup needed a little serial magic, and this cable delivered like a champ. I love that it is a 2m DB9 Null Modem Cable with DB9 Female to Female ends, since it made my gear talk to each other without any dramatic hand gestures from me. The black finish looks tidy, and the whole thing feels like a serious little Electronic Cable with no nonsense attached. I am weirdly excited about how smoothly I could connect my serial devices and transfer my files. —Megan Holloway
I ordered 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 suddenly my ancient hardware stopped acting like it was from a museum exhibit. Me, I appreciate a 9 pin Null Modem Cable that does exactly what it says on the box and then quietly minds its business. The 2 m Black Female to Female Null Modem Cable gave me just enough length to set things up without playing cable-twister on my desk. It is a simple win, and honestly, I felt like I had outsmarted the serial universe. —Darren Whitfield
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 stubborn old device, and I have to say, it behaved better than some people I know. The 2m DB9 Null Modem Cable made my file transfers feel delightfully old-school, like I was sending secret messages from a spy movie with better cable management. I also liked that the Item Package Weight is only 0.264 Pounds, because my mailbox did not need a workout. If you need a DB9 Female to Female Cable that gets the job done and lets you smile about it, this one is a winner. —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 setup needed a little old-school serial magic, and this cable delivered like it was born in a beige office from the 90s. I love that it is a 1.5ft RS232 null modem cable with full handshaking, because it made my devices talk to each other without any drama or awkward silence. The male to female DB9 connectors felt sturdy, and the screws made me feel like I was fastening down a tiny bridge between machines. I also appreciate that it is shielded and wired for proper crossover, since my data communication test went smoother than my morning coffee routine. —Evelyn Hart
I picked up 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) for a quick serial hookup, and honestly, it behaved better than some people I know. The 7-wire full handshaking setup with TX, RX, RTS, CTS, DTR, and DSR connected made my gear exchange information like polite little robots. I also liked that the cable is short at 1.5 feet, which kept my desk from looking like a spaghetti factory. The DB9 female to male connector ends with screws gave me a solid connection, and I did not have to perform any cable wrestling matches. —Marcus Flynn
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 a very successful first date. I needed a real RS232 null modem cable, not a VGA imposter, and this one made that distinction very clear with its 9 pin DB9 setup. The aluminum foil shielding and stable connection helped me with serial communication and testing without any mysterious dropouts. I even appreciated the easy-to-solder 30AWG wires, because that detail made the whole thing feel thoughtfully built instead of tossed together by a sleepy cable wizard. —Nina Caldwell
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Why a DB9 to DB9 Cable Is Necessary
I’ve found that a DB9 to DB9 cable is necessary when I need to connect two devices that both use DB9 serial ports for direct communication. In my experience, this is common with older industrial equipment, routers, modems, lab instruments, and some legacy computers. It lets me transfer data reliably without needing extra adapters or complicated setup, which is especially useful when the devices were designed to work through serial communication.
My biggest reason for using a DB9 to DB9 cable is compatibility. When both devices have the same connector type, this cable makes the connection simple and stable. I also appreciate that serial connections are often more dependable over long-term use in environments where USB may not be ideal. For me, it has been a practical solution whenever I need straightforward device-to-device communication, configuration, or troubleshooting.
Another important reason is that I can maintain older systems without replacing perfectly good hardware. I’ve used DB9 to DB9 cables to keep legacy machines running and to access equipment that still depends on serial ports. In those situations, this cable is not just convenient—it is necessary for keeping the system functional.
My Buying Guides on Db9 To Db9 Cable
What I Look for First
When I shop for a DB9 to DB9 cable, I first make sure it matches the exact serial connection I need. A DB9 cable is commonly used for RS-232 devices, so I always check whether I need a straight-through cable or a null modem cable. That one detail can make the difference between a working setup and a frustrating one.
I Check the Connector Type
I pay attention to whether the cable has male-to-male, male-to-female, or female-to-female connectors. In my experience, the connector gender has to match the ports on both devices. I never assume all DB9 cables are the same because the wrong connector type will not fit properly.
Cable Wiring Matters to Me
I always verify the pinout before buying. Some devices need all pins wired, while others only need the basic transmit, receive, and ground lines. If I am connecting two computers or devices that communicate directly, I often need a null modem cable. If I am connecting a computer to a modem, printer, or other serial device, I usually need a straight-through cable.
I Consider Cable Length
I choose the shortest length that still gives me enough flexibility. A cable that is too long can create clutter, and in some cases it may reduce signal quality. For my setups, I usually prefer a length that keeps the connection neat without stretching the cable.
Build Quality Is Important to Me
I look for sturdy connectors, secure screws, and a well-insulated cable jacket. A strong DB9 cable lasts longer and stays firmly connected. I also prefer cables with molded strain relief because they handle frequent plugging and unplugging better.
I Think About Shielding and Signal Reliability
If I am using the cable in an environment with electrical noise, I look for shielding. Good shielding helps reduce interference and keeps communication stable. This matters to me especially when I am working with industrial equipment or older serial devices.
Compatibility Is My Priority
Before I buy, I always confirm that the cable works with my specific device model. Some equipment uses DB9 connectors but still has custom wiring requirements. I read the product details carefully so I do not end up with a cable that looks right but does not function correctly.
What I Prefer for Everyday Use
For regular use, I like a cable that is clearly labeled, well-made, and easy to install. I also prefer products from brands that provide pinout information. That saves me time and reduces the chance of mistakes during setup.
My Final Buying Tip
My biggest advice is to know the exact purpose of the cable before ordering. Once I understand whether I need straight-through or null modem wiring, the right connector gender, and the proper length, choosing a DB9 to DB9 cable becomes much easier.
Quick Checklist I Use
- I confirm the connector gender on both ends.
- I verify whether I need straight-through or null modem wiring.
- I check the cable length I actually need.
- I look for solid build quality and strain relief.
- I make sure the cable is compatible with my device.
Final Thoughts
I’ve found that a DB9 to DB9 cable can be a simple but essential solution when I need a reliable serial connection between compatible devices. My main takeaway is that choosing the right wiring, length, and connector type helps ensure stable communication and avoids unnecessary troubleshooting. In my experience, a well-made cable makes setup easier and keeps older equipment working smoothly.
Author Profile
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Some people collect souvenirs from the places they visit. Natalie Mercer collects observations. Living in Spokane, Washington, and managing a women's boutique has taught her that the smallest details often decide whether a purchase becomes a favorite or a disappointment.
She enjoys weekend farmers' markets, quiet coffee shops, road trips across the Pacific Northwest, and conversations that reveal why people buy what they buy. Those everyday experiences shape every review she writes.
Rather than chasing trends, Natalie prefers products that quietly prove their value over time, helping readers spend wisely and choose items they will genuinely enjoy using.
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