We shall see. I did setup a test on my bench, and all the modes work as I expected. I ordered a bunch of them as I can see using them for a couple of neat projects. I will have to do some minor mods before I can use them. First off, I have to interface them to some non-TTL inputs, and I also need a power supply for each end.
I'm thinking I can pull the right angle connector off and use straight pins and just sandwich then with a motherboard that supplies the support circuits and power supply.
I just used one of the relay models that is similar to remote my doorbell so I can hear it downstairs in my workshop.