Monitoring system with improved alerting and locating

• US 4,999,607 A
• Filed: 03/13/1989
• Issued: 03/12/1991
• Est. Priority Date: 12/07/1987
• Status: Expired due to Fees

• Current Assignee: Biotronics Enterprises Incorporated
• Original Assignee: Biotronics Enterprises Incorporated
• Inventors: Evans, Wayne W.
• Primary Examiner(s): Crosland, Donnie L.
• Application Number:
  US07/322,616
• Time in Patent Office: 729 Days
• Field of Search: 340/533, 340/531, 340/539, 340/506, 340/505, 340/537, 340/538, 340/310 R, 340/310 A, 340/310 CP
• US Class Current: 340/533
• CPC Class Codes: G08B 25/009 Signalling of the alarm condition to a substation whose identity is signalled to a central station, e.g. relaying alarm signals in order to extend communication range
• CPC Class Codes: G08B 25/04 using a single signalling line, e.g. in a closed loop

Abstract

An expansive and expandable monitoring system which in one of its broadest embodiments includes a multi-sector, multi-condition monitoring system including radio linked alert monitors, smoke monitors and an expandable range of activity monitors such as door-opening monitors and toilet-flushing monitors and including method and apparatus for identifying a particular monitor within a sector; wherein each sector stands itself as a unique sub-system built about a two-wire bus on which both power identifying signals are simultaneously conveyed along the same two wires; and within each sector, the plurality of monitoring devices receive operating power from a common power source and convey identifying signals to a common discriminator (identifier) arrangement all along the common two-wire bus, each monitoring device being constructed with a unique arrangement of current modulating and signal/voltage isolation elements to facilitate the common bus--common power source--common discriminator scheme of the present invention; and wherein the system includes unique, all coded receivers including method and apparatus for accepting, encoding, conveying and decoding the coded signals of a plurality of transmitter devices.

Claims

1. A multi-condition monitoring system, comprising:

a plurality of indicator means for indicating the occurrence of multiple conditions, wherein each indicator means of said plurality of indicator means indicates the occurrence of at least one condition of said multiple conditions;

each said indicator means changing from a non-triggered status to a triggered status upon occurrence of the respective condition;

a plurality of monitoring means for monitoring the status of said plurality of indicator means, wherein each monitoring means of said plurality of monitoring means monitors the status of at least one indicator means of said plurality of indicator means;

each said monitoring means comprising, at least, a detecting means for detecting said triggered status of the respective said indicator means, and a signal means for developing an identifying signal in direct response to detection of said triggered status by said detecting means;

each said monitoring means of said plurality of monitoring means requiring electric power for operation;

signal conditioning means for acting upon said identifying signal of each said monitoring means of said plurality of monitoring means to generate usable output;

power means for supplying operating power for each said monitoring means of said plurality of monitoring means;

a two conductor bus connecting said plurality of monitoring means to said power means and to said signal conditioning means, said two conductor bus carrying said identifying signals from all monitoring means of said plurality of monitoring means to said signal conditioning means and carrying said operating power from said power supply means to all said monitoring means of said plurality of monitoring means; and

each said monitoring means being connected to said bus in series electrical relationship with said power means and said signal conditioning means and being connected to said bus in parallel electrical relationship with each of the other said monitoring means of said plurality of monitoring means.

2. System of claim 1, wherein said signal conditioning means comprises, at least, discriminating means for discriminating said identifying signal developed by each said monitoring means from said identifying signal developed by each other said monitoring means of said plurality of monitoring means.

3. System of claim 2, wherein said signal means of each said monitoring means comprises at least:

an impedance means for creating an impedence within a circuit; and

switch means for connecting said impedance means to said two conductor bus in response to detection of said triggered status by said detecting means;

whereby said impedance is placed on said two conductor bus impacting current flow within said bus, said impacted current flow defining said identifying signal for the respective said monitoring means.

4. System of claim 3, wherein said impedance means of each said monitoring means is characterized by creation of an impedance differing from the impedence created by said impedance means of each other monitoring means of said plurality of monitoring means;

and

wherein said discriminating means comprises, at least, a resistance element positioned in said two conductor bus and a voltage processing device in parallel electrical relationship with said resistance element, said parallel combination of said resistor element and said voltage processing device being positioned in series electrical relationship with said impedance of each said impedance means,

whereby each impedance effects a definable voltage drop across said resistance element.

5. System of claim 4, wherein said impedance means of each said monitoring means creates an impedance of predefined value.

6. System of claim 2, wherein said signal means of each said monitoring means of said plurality of monitoring means comprises at least:

pulse generating means for generating a pulsing signal in response to detection of said triggered status by said detecting means; and

modulating means modulated by said pulsing signal for modulating current flow in said two conductor bus, said modulated current flow defining said identifying signal.

7. System of claim 6, wherein said discriminating means comprises resistance means positioned within the two wire bus for creating a voltage drop in response to said modulated current flow and a voltage processing means for processing said voltage;

and wherein each said monitoring means of said plurality of monitoring means further comprises at least;

voltage regulating means for regulating voltage to said monitoring means as supplied by the two-conductor bus;

means associated with said voltage regulating means for defining on said bus a low impedance; and

isolation means for isolating said low impedance from said modulating means.

8. System of claim 6, wherein said pulse generating means of each said monitoring means generates a pulsing signal defining a pre-assigned code, being a code pre-assigned to the respective said pulse generating means;

and

wherein said modulating means of each said monitoring means modulates current flow in said bus to effect a modulated current representing said code pre-assigned to the respective said pulse generating means; and

wherein said discriminating means comprises, at least, decoder means for decoding said pre-assigned code as represented by said modulated current flow.

9. System of claim 1, wherein each indicator means of said plurality of indicator means indicates the occurrence of one of the following conditions:

the presence of smoke;

the presence of moisture;

engaging of a signal transmitter activation trigger;

motion in a sector;

movement of an object such as, but not limited to, a door or toilet flush handle.

10. System of claim 9, wherein each indicator means of said plurality of indicator means indicates the occurrence of a condition different from that indicated by each of the other said indicator means.

11. System of claim 1, wherein a first indicator means of said plurality of indicator means comprises, at least, a radio transmitter activation trigger, whereby said first indicator means indicates the occurrence of engaging said trigger and said triggered status is defined as an engaged trigger;

and

wherein said detecting means of a first monitoring means comprises, at least, a radio transmitter activation switch circuit detecting the engaging of said trigger by closing of a switch to complete a circuit; and

wherein said signal means of said first monitoring means comprises, at least, a radio transmitter means activated by said activation switch circuit for generating a radio signal, a radio receiver means for receiving said radio signal and converting said received radio signal to an electrical signal, and means for affecting current flow within said two conductor bus in response to said converted electrical signal, said affected current flow defining said identifying signal.

12. System of claim 11, wherein said means for affecting current flow comprises, at least:

an impedence means for creating an impedance within a circuit; and

switch means for connecting said impedance means to said two conductor bus in response to detection of said converted electrical signal;

whereby said impedance is placed on said two wire bus impacting current flow within said bus, said impacted current flow defining said identifying signal for said first monitoring means.

13. System of claim 11, wherein said means for affecting current flow comprises, at least:

pulse generating means for generating a pulsing signal in response to detection of said triggered status by said detecting means; and

modulating means modulated by said pulsing signal for modulating current flow in said two conductor bus, said modulated current flow defining said identifying signal for said first monitoring means.

14. System of claim 1, wherein each detecting means of said plurality of detecting means comprises, at least, the closing of a normally open switch.