"Can there be two(2)DOC devices on the same Dry contact port"
Same dry contact port on what?

"once triggered, both devices will open."
What is the setup?
2 doors with their own door phones? or explain otherwise.

Each DOC can be programmed with their own code via dip switches.

How often is somebody going to ring the front door and ask for reception to open the back door?.
I guess if you are Maxwell Smart then being able to control 12 doors/docs with one door phone might come in handy.

One DOC per Door Phone in a normal environment.


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