


🔗 Connect with confidence — keep your legacy gear in the game!
The STSI NULL-A-9FF is a compact, lightweight DB9 female-to-female null modem adapter designed to connect USB-to-serial cables with older switches and test equipment. Featuring secure screw-lock fittings and a durable build, it offers reliable performance favored by professionals needing seamless legacy device integration.
| ASIN | 7507825604 |
| Best Sellers Rank | #133 in Modem Cables |
| Customer Reviews | 4.2 4.2 out of 5 stars (81) |
| Date First Available | December 3, 2008 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.32 ounces |
| Item model number | NULL-A-9FF |
| Manufacturer | STSI |
| Product Dimensions | 6 x 4 x 2 inches |
O**Z
Great, inexpensive
Great, inexpensive, crossover adapter. Been using it constantly to connect a USB-to-serial console cable to old switches and it hasn't failed me one bit. Screws line up nicely on both sides for a secure fit when needed.
D**N
They get the job done...
I bought 4 of these for my test equipment - they got the job done. Though the screw on one of these did snap under medium torque... the other 3 adaptors were fine under the same torque. However, on a different one of these adaptors, I had to “open up” one of the pin holes slightly before it would accept my male cable. I would probably buy again.
W**T
Cheap, shipped fast, and it works
It is not very often that I can get something cheap, fast, and that performs as it should. This is one such item. The hardware seems to be durable, it is very compact, and it performs the simple null modem task.
S**R
Great null modem adapter
I needed a female to female null modem adapter and this worked out perfectly. I'm using this in a retrocomputer project where I needed to connect a DB9M usb-to-serial adapter to a DB9M console port.
K**A
Works Great
This product works just as described in the description. It is indeed a null cable replacement. I did have one adapter come defective from the factory, but bargain cable is sending me out a replacement at no cost to me.
M**S
Funciona bien
F**T
Beware - it does nothing!
Mine came wired as a straight-through connection - not a null-modem! Since its M to F, it's basically a useless, pretty little nub to add into your serial connection. YMMV, but I ended up ordering a null-modem adapter from a more reputable brand.
J**S
Three Stars
works as decribed
Trustpilot
1 week ago
1 month ago