Alarm and utility meter reading system employing telephone...

Details Alarm and utility meter reading system employing telephone... Alarm and utility meter reading system employing telephone...

H - Electricity

04

M

379/25, 379/8

H04M 11/00 (2006.01) G01D 5/12 (2006.01)

Patent

CA 1038978

ABSTRACT OF THE DISCLOSURE Disclosed is a system for utilizing existing telephone subscriber lines during ON hook conditions. for low level direct current signalling. The system employs basically a stepped resistance element connected across the subscriber line with remote switches for short circuiting descrete resistance steps. Employing binary encoded resistance steps a large number of signalling conditions may be transmitted with the stepped resistance element acting as an extremely simple encoder. Utility meters may be easily monitored. The resistance element and sensor switches are connected in simple logical arrangements whereby many identifiable signals may be sent including fail safe and test information.

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