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120V Tandem Smoke Detector Operation?

Subject: 120V Tandem Smoke Detector Operation?
From: nearly_blind <nearly_blind@xxxxxxxxx>
Date: Wed, 3 Jun 2009 08:02:37 -0700 (PDT)
Newsgroups: alt.security.alarms

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.
Thanks.

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