120V Tandem Smoke Detector Operation?

These have a 3 pin detector: Hot, Neutral, and the Tandem.
How does the Tandem function work ?
In other words, when the detector is activated, what electrical change
occurs on the tandem wire ? Is a signal generated ? Is it switched
to Hot ? Please be as specific as possible.
Also, what is inactive state of the tandem wire?
An example unit would be a Kiddie Frynetics 1235.
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