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Hello, After reading this I have a question about a setup I want, not sure where to connect the relay. I want the relay to turn on a PMW that will be used by an other device. The "Other PSU" is the one that provides the signal for the relay to turn on. Now I'm not sure I can connect the positive one to COM and other to NO, because you said only to connect negative to COM. The "Other PSU" will be connected to Port 1 and Port 2, that is not the problem. I want to switch the positive wire from the PMW not the negative one. Here is a crude image of the settup:
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