How does the Konnected Alarm Panel Interface Module work electrically?

Konnected Alarm Panels
1

Regarding the interface module.

I’m wondering how the interface does not interfere with the zone (I’m new to electronics). If the interface connects to existing zone + terminal, it effectively creates a parallel circuit with the sensor right? The panel monitors the zone resistance to decide if the zone is violated or tampered, but adding the interface in parallel surely must change the resistance being monitored? If that is the case and the interface potentiometer is what caters for this, then how would it work if a zone is violated?

If the zone is violated on a NO (with its own resistor in parallel) sensor the interface would see a huge reduction in current I guess? Does the interface watch for current then?

But if the zone is violated on a NC sensor (with its own resistor in series) the interface would see higher current? Since the interface is in parallel and the sensor side is open, how would the interface know the zone is violated?

If the interface is monitoring voltage and not current, how would it know about zone violation given that parallel circuits have same voltage even if one branch (the sensor) is opened?

I’m confused about how the interface works electrically while not interfering with the zone on the panel side.

Any insights appreciated, thanks.

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The interface module is only connected to the “high” side of the zone on the alarm panel so it’s not creating a parallel circuit since there’s no loop back to ground/common. It also doesn’t draw any current from the zone.

Basically it uses an comparator circuit to compare the voltage coming in from the zone to the baseline voltage from the panel’s AUX. The tunable potentiometers are used to tune in to the threshold between open and closed.

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