The outputs are solid state relays which effectively act like a switch so the positive and negative do not matter. We originally labelled them as +/- just to differentiate them, but I can see how it could be misleading. I will look at updating their labels to something like OUTPUT1A and OUTPUT1B.
In terms of connecting the IoT relay, you can hook the output up either way and it will work.
The issue I’m trying to point out is not the + to - sides, it is the text says to connect to pin 13 and it should be to pin 11. I found this because I wired it up like the text and it would not work. Moving the wire from 13 to 11 worked.
My initial wiring is to include an additional remote switch to bypass the controller so I can turn on the vacuum easily. Without knowing more about the internals, I had the IOT piece replaced with a relay coil and the switch would bypass the relay contacts. It was not working, so ripped out everything and wired up directly like the diagram without changing the DB25 and it still did not work. This is where I figured out the pin had to change based on the picture and then referencing the output diagram to match OUT1+ and OUT1- instead of OUT1+ (which is just one side of a switch) and Isolated Ground.
Thanks. It looks like the photo in our article was correct but, as you pointed out, the text above it was incorrect. I have updated it to say pin 11 instead of pin 13. Thanks again for pointing that out.
P.S. It may take up to 5 minutes for the changes to the documentation website to propagate to all the servers.