Multiplex interrogation system using pulses

Details Multiplex interrogation system using pulses Multiplex interrogation system using pulses

H - Electricity

04

J

340/90

H04J 3/02 (2006.01) H04Q 9/02 (2006.01)

Patent

CA 1086396

"MULTIPLEX INTERROGATION SYSTEM USING PULSES" ABSTRACT OF THE DISCLOSURE This interrogation system monitors the status of a plurality of protection zone transducers by repeatedly supplying a series of sequential interrogation pulses thereto sufficient to address and scan every transducer associated with a protection zone. Reply pulses are received from a trans- ponder associated with a protection zone transducer and the reply pulses received over a selected number of prior sequential scans form a response pattern from which the condi- tion of each transducer and its protection zone is determined. At least three conditions may be determined from the reply response pattern, including an alarm condition, a normal condition, and an out-of-service condition. Information relative to each transducer and its respective protection zone is stored in the form of bits at memory addresses cor- responding to the count of the protection zone transducer from which that information is received. Provision is made for synchronizing the transducers associated with the respective protection zones to the count of interrogation pulses delivered thereto to thereby maintain accurate correlation and integrity between the protection zones addressed and the reply pulses received. The interrogation and reply pulses are preferably direct voltage pulses and the system is compatible for use with connection to a standard telephone line system. Information in the form of a visual indication and printed record may be provided relative to the status, function and number of a selected transponder and the condition of its protection zone.

279944

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