Digital dialers for use in the security field

• US 4,137,429 A
• Filed: 06/29/1977
• Issued: 01/30/1979
• Est. Priority Date: 06/29/1977
• Status: Expired due to Term

• Current Assignee: Napco Security Systems Incorporated
• Original Assignee: Napco Security Systems Incorporated
• Inventors: Stockdale, Roy
• Primary Examiner(s): Claffy, Kathleen H.
• Assistant Examiner(s): Chayt, Kenneth A.
• Application Number:
  US05/810,930
• Time in Patent Office: 580 Days
• Field of Search: 179/5 P, 179/5 R, 179/2 A
• US Class Current: 379/42
• CPC Class Codes: H04M 11/04 with alarm systems, e.g. fire, police or burglar alarm systems

Abstract

There is disclosed a digital dialing system operative to send a subscriber code and an alarm indication to a remote station via a communications link such as a telephone line. The digital dialer employs a memory which is preprogrammed to store a number of a central station to be dialed and which automatically transmits to that station when accessed, a code manifesting the location having the difficulty. The memory is further adapted to automatically transmit an additional signal indicative of the type of alarm condition such as a fire or a burglary which conditions are stored at predetermined locations in the memory. These memory locations are accessed by a memory address counter which is set at the end of a zone identification procedure by an alarm logic circuit. The dialer thus allows one to store a plurality of conditions indicative of different types of alarms to enable the central monitoring station to send or direct the proper equipment or authorities to the scene as the Fire Department, Police Department, and so on.

Claims

1. A telephone dialer apparatus of the type adapted to access a telephone line to transmit a dialing code via said line indicative of the location of a remote central station and to supply said station upon accessing of the same with a subscriber code address manifesting the location and condition of an alarm emanating from a monitored zone under surveillance, said zone including a plurality of alarm detectors, each capable of responding to a different alarm situation, comprising:

(a) a programmable accessible memory having a plurality of storage locations, with a first group of said locations storing a code indicative of the location of said remote central station, a second group of storage locations having stored therein a code indicative of the subscriber address code associated with said monitored zone, and a third group of storage locations having stored therein a plurality of codes, each indicative of a particular alarm condition present at said monitored zone, according to said detectors,

(b) first means coupled to said memory to cause said memory to first provide an output a first code associated with said first group of locations manifesting the location of said remote central station and means responsive to said code to provide a dialing format to said telephone line for accessing said central station,

(c) logic means coupled to said memory and responsive to said first code being provided to cause said memory to provide a second code associated with said second group of locations for transmission to said remote station of a signal indicative of the address of said monitored zone, and

(d) means coupled to said memory and responsive to the transmission of said address signal to cause said memory to provide a third code associated with said third locations for transmission to said remote station an alarm signal indicative of the particular type of alarm situation emanating from said monitored location.

2. The dialer according to claim 1 wherein said first means includes a counter coupled to said memory and capable of providing at an output a plurality of codes indicative of said first, second or third storage locations.

3. The dialer according to claim 2 further including means coupled to said counter and operative to select any one of said plurality of codes to thereby cause said memory to provide any desired one of first, second or third codes.

4. The dialer according to claim 1 wherein said monitored zone includes at least one sensor capable of providing an alarm condition indicative of a fire and another sensor capable of providing an alarm condition indicative of an intrusion.

5. The dialer according to claim 4 further including logic means coupled to said one and another sensor to provide at an output, a code adapted to access said memory to provide said code associated with one of said third storage locations according to the sensor which is indicating said condition.

6. The dialer apparatus according to claim 1 further comprising timing means coupled to said memory and operative to sequence said memory to cause said memory to provide said first, second or third codes in a predetermined sequence as controlled by said timing means.

7. The dialer according to claim 1 wherein said first means further include an inter-digit generator operative to access said memory at successive locations within said first group of locations.

8. The dialer according to claim 4 further including means coupled to said sensors adapted to provide a control signal indicative of the operation of any one sensor indicating an alarm condition and means responsive to said control signal for accessing said telephone line.

9. The dialer apparatus according to claim 1 wherein said memory is programmable read only memory having a plurality of addressable input lines and a plurality of output lines, said output lines capable of providing said code associated with said first, second or third locations when a unique address code is applied to said input lines, and means coupled to said input lines for generating a plurality of addresses each associated with a different one of said locations.

10. The dialer apparatus according to claim 6 further including means coupled to said timing means and operative to control the duration of said sequence and therefore the duration at which said memory supplies said first code as compared to said second code as compared to said third code.