Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1981-08-28
1983-10-25
Trafton, David L.
Communications: electrical
Condition responsive indicating system
With particular system function
340541, G08B 2900
Patent
active
044122110
ABSTRACT:
A system for providing a distinctive indication that a system, such as a security system, is in a test mode in which the distinctive indication includes audible and/or visual indications that a test sequence has been initiated, followed by testing of the system during the test sequence, with test results being indicated by altering the format of the audible or visible signal. In one embodiment involving a security system, a periodic signal is changed to a steady state signal when a sensor has been violated, thereby to provide a reminder that the system is in the test mode followed by instantaneous communication to the user of not only the operability of the sensor but also both the transmission of the sensor's output to a central control unit and the operability of this control unit itself.
REFERENCES:
patent: 3487404 (1969-12-01), Midkiff
patent: 3781859 (1973-12-01), Hermans
patent: 3846782 (1974-11-01), Brodsky
patent: 4138674 (1979-02-01), Humphries
Beeson Kenneth E.
Edson James B.
Henderson Martin E.
Lautzenheiser William J.
Simonetti Richard A.
American District Telegraph Co.
Trafton David L.
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