DB9 null modem male to female slimline data transfer serial port adapter 2 Pack

This adapter absolutely does the trick. I wasn't getting any signal at all with my setup, but as soon as I put this null modem adapter in, everything started working instantly. It's a very simple plug-and-play solution that just does the job perfectly. Highly recommend if you're dealing with serial communication signal issues! It even comes as a two-pack. I only need one, so I'm not sure what to do with the other now.

I purchased these for connecting legacy equipment that requires a null modem configuration, and they worked exactly as expected. The slimline form factor is helpful in tight setups where multiple DB9 connectors sit close together. Fit is solid once connected, and there’s no noticeable play in the connection. One detail I especially appreciate is the mechanical design of the screw posts. Each jack screw is essentially a double-sided threaded post — one end secures the adapter to the equipment’s serial port, and the other end has internal threading to accept the thumbscrews from the connected cable or another adapter. This allows the connection to be mechanically fastened on both sides, which adds stability and prevents accidental loosening in lab, rack, or field environments. Signal transfer has been stable with no communication issues during use. For serial troubleshooting or legacy device connections, they’ve been reliable.

Having been born in 94, I had never heard of null modem communication. Suddenly, the place I work for needs to start testing RF cables. They bought me an older piece of equipment that can be interfaced with via an "RS232" appearing port. Grabbed my trusty usb to serial cable. Couldn't get anything. Took a week of emails back a forth with the OEM to figure out I need a "null modem cable" to plug my cable into first. ANYWAYYY, this fixed everything after having to run software on a virtual box. I assume that means this works perfectly for whatever it is this adapter is for. 11/10 still have no idea what null modem communication is but I'm impressed.

Like that they came as a 2 pack, as I always need more than 1. Product works as advertised.

As advertised, good deal.

I had a new system that needed a null modem cable. I had a conventional RS232 cable of the proper length with nicely molded connectors. Instead of cutting one off and rewiring a new connector to create a null modem, I purchased this DB9 null modem adapter. Perfect! Arrived next day. Took a minute to install and the system took off, as expected. A well made part.

Just what I needed to connect a standard serial cable to an SEL Feeder Protection Relay. Don't bother buying an expensive SEL cable.

Because serial is not exactly current technology it can be difficult to tell both what type of cable you need and what type of cable you are buying. Sellers don't know the difference and even if things are properly labeled the terminology and jargon might as well be hieroglyphics at this point. After purchasing the wrong ones, and buying the "right ones" but receiving completely different mislabeled cables, this item allowed me to get my DB9 - DB25 Epson Thermal Printers working. I still don't know exactly which cables I purchased or which I needed, but these fixed the issue regardless.

As described.

Llegó en tiempo y forma

Amazon were the only market place to sell these null modem adapters at a great price. Quality item and an essential for older/retro computers and serial devices. Two of them are included in the package.

It works

Ordered the wrong adapters, my fault, got caught by terminology. I ordered M/F I needed F/F. Sent in another order. I am happy to add to my toolbox, I do a lot of serial device connectivity. Good solid product, for a simple device.