Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1997-07-30
1999-03-16
Swann, Glen
Communications: electrical
Condition responsive indicating system
With particular system function
340650, 340652, 340661, 340692, 381 56, 381 58, 381 59, G08B 2910
Patent
active
058835733
ABSTRACT:
Circuits for supervising message generators and audio output cables include memory for binary storage of messages previously recorded in a message generator. As the generator is cycled to produce an audio output, that analog output is sampled and compared to the previously stored binary representation. A match indicates a successful generation of the message. The cables can be supervised by applying a DC bias thereto and detecting the voltage present on the respective cable. Line integrity is indicated where the cable DC voltage falls in an expected range.
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Mazeiko, Jr. Edward J.
Troiano, Jr. Michael A.
Pittway Corporation
Swann Glen
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