I was generalizing, as was Frank in the first post.
Some series-circuit systems do not see a difference between an alarm condition and a line break. Opening a circuit is opening a circuit.
"A open condition in the circuit causes a trouble."
In a parallel (N.O.) circuit with an end-of-line resistor, yes. In a N.C. circuit, that looks like a trip.
"A closed condition in the circuit causes an alarm."
In the aforementioned N.O. circuit, ditto. In a series circuit, a short is a bypass.
"A circuit with the proper resistance results in a idle panel."
Back at ya!
[This message has been edited by Larry Fine (edited 05-30-2005).]