Diode base for smoke detector?

I have seen a few smoke detector bases with schottky diode, does anyone know what they do?

When a detector is plugged into the base it shunts the diode. When the detector is pulled out of the base, the circuit still works, but the diode blocks a reverse polarity signal from the panel.



Basically, it’s a method a conventional panel uses to put the system into trouble if a detector is missing, but if a detector is pulled out the rest of the zone still works.

I see, so the diode will allow current flow to the next device but the panel won’t see the EOLR? I thought as long as current is flowing the panel will see the resistor, no?