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NO892557L - Pulse-encoded smoke / fire detection system. - Google Patents

Pulse-encoded smoke / fire detection system.

Info

Publication number
NO892557L
NO892557L NO89892557A NO892557A NO892557L NO 892557 L NO892557 L NO 892557L NO 89892557 A NO89892557 A NO 89892557A NO 892557 A NO892557 A NO 892557A NO 892557 L NO892557 L NO 892557L
Authority
NO
Norway
Prior art keywords
voltage
transponders
line
logic level
data
Prior art date
Application number
NO89892557A
Other languages
Norwegian (no)
Other versions
NO892557D0 (en
Inventor
Lee D Tice
Todd W Fritz
Mark A Kilcommons
Original Assignee
Pittway Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US07/111,811 external-priority patent/US4916432A/en
Application filed by Pittway Corp filed Critical Pittway Corp
Publication of NO892557L publication Critical patent/NO892557L/en
Publication of NO892557D0 publication Critical patent/NO892557D0/en

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  • Fire Alarms (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

Røk/branndeteksjonssystem (10) hvor en sentral styreenhet (12) overfører data til «køterna transpondere (24, 26) over en overføringslinje (22) som samtidig tjener som kraftforsynings- linje, ved pulskodemodulasjon (PCM) av tilfør- selsspenningen, og hvor transponderne (24, 26) står i signalforbindelse med styreenheten (12) ved hjelp av pulsbreddemodulerte (FHM) strøm- pulser. En prosessor (30) i styreenheten (12) tilveiebringer en normal driftsspeaning pl linjen (22) og sender ut et dataord BOB omfat- ter flere databit til transponderne (24, 26) ved å endre linjespenningen fra den nominelle verdi til en første spenning som tilsvarer et første logisk nivå eller til en andre spenning atm tilsvarer et andre logisk nivå. En dekoder (84) i hver transponder (24) detekterer spennings- endringen og fastlegger det logiske nivå for hver overført bit ved å måle det overførte spenningsnivå umiddelbart etter detekteringen av spenningsendringen. Transponderen (24) sen- der så tilbake datasignaler til styreenheten (12), idet hvert signal har en varighet som bygger på de data som skal sendes tilbake.Smoke / fire detection system (10) wherein a central control unit (12) transmits data to the "transponders" (24, 26) over a transmission line (22) which simultaneously serves as a power supply line, by pulse code modulation (PCM) of the supply voltage, and where the transponders (24, 26) are in signal communication with the control unit (12) by pulse width modulated (FHM) current pulses. A processor (30) in the controller (12) provides a normal operating voltage on the line (22) and outputs a data word BOB comprising multiple data bits to the transponders (24, 26) by changing the line voltage from the nominal value to a first voltage which corresponds to a first logic level or to a second voltage atm corresponds to a second logic level. A decoder (84) in each transponder (24) detects the voltage change and determines the logic level for each transmitted bit by measuring the transmitted voltage level immediately after the detection of the voltage change. The transponder (24) then sends back data signals to the controller (12), each signal having a duration based on the data to be returned.

NO892557A 1987-10-21 1989-06-20 PULSE CODED ROD / FIRE DETECTION SYSTEM. NO892557D0 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/111,811 US4916432A (en) 1987-10-21 1987-10-21 Smoke and fire detection system communication
PCT/US1988/003217 WO1989004032A1 (en) 1987-10-21 1988-09-16 Smoke and fire detection system communication

Publications (2)

Publication Number Publication Date
NO892557L true NO892557L (en) 1989-06-20
NO892557D0 NO892557D0 (en) 1989-06-20

Family

ID=26777820

Family Applications (1)

Application Number Title Priority Date Filing Date
NO892557A NO892557D0 (en) 1987-10-21 1989-06-20 PULSE CODED ROD / FIRE DETECTION SYSTEM.

Country Status (1)

Country Link
NO (1) NO892557D0 (en)

Also Published As

Publication number Publication date
NO892557D0 (en) 1989-06-20

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