Coding system for an alarm system and the like

• US 4,048,621 A
• Filed: 03/17/1976
• Issued: 09/13/1977
• Est. Priority Date: 03/17/1976
• Status: Expired due to Term

• Current Assignee: Holmes Protection Incorporated (Johnson Controls International plc)
• Original Assignee: Holmes Protection Incorporated (Johnson Controls International plc)
• Inventors: Conklin, Robert M., Human, Arthur T.
• Primary Examiner(s): Yusko, Donald J.
• Application Number:
  US05/667,786
• Time in Patent Office: 545 Days
• Field of Search: 340/168 R, 340/168 B, 340/147 MD, 340/164 R, 340/274, 340/345, 340/348, 340/353, 235/92 DE, 235/92 PE, 235/92 EA, 235/92 ST, 235/92 GT, 235/132 A
• US Class Current: 340/7.45
• CPC Class Codes: G08B 25/00 Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
• CPC Class Codes: G08B 25/002 Generating a prealarm to the central station
• CPC Class Codes: G08B 29/08 Signalling of tampering with the line circuit
• CPC Class Codes: H04M 11/04 with alarm systems, e.g. fire, police or burglar alarm systems

Abstract

A system for registering and transmitting a preselected code to a receiving station which comprises a switch operable between open and closed states. An oscillator is responsive to the operation of the switch to the closed state for producing a pulse train. A control device is provided that has a plurality of states and is movable from state to state in response to an advance signal which is generated by an advance signal generator. The advance signal generator is operable by an energizing signal. A counter is connected to the oscillator for registering the number of pulses in response to one state of the control means. A transmitter is responsive to another state of the control means for connecting the oscillator to a transmission line. The counting means includes a generator for generating the energizing signal and for applying the same to the advance signal generator to change the state of control means when the number of pulses transmitted by the transmitting means is equal to the count registered in the counter.

Claims

1. A system for registering and transmitting a preselected code to a receiving station comprising switch means operable between open and closed states;

an oscillator responsive to the operation of said switch means to the closed state for producing a pulse train;

an advance signal generator for generating an advance signal in response to an energizing signal;

control means having a plurality of states and being movable from state to state in response to said advance signal;

counting means connected to said oscillator for registering the number of pulses in response to one state of said controlled means;

transmitting means responsive to another state of said control means for connecting said oscillator to a transmission line;

said counting means comprising energizing signal generating means for applying an energizing signal to said advance signal generator to change the state of said control means when the number of pulses transmitted by said transmitting means is equal to the count registered in said counting means.

2. A system as in claim 1, and display means connected to said counting means for displaying the count registered therein.

3. A system as in claim 2, in which said control means comprises disabling means responsive to said other state of control means for disabling said display means.

4. A system as in claim 1, and timing means responsive to said open state of said switch means for disabling said system after a preselected period of time.

5. A system as in claim 1, in which said counting means comprises means for counting pulses in a first direction in response to said one state of said control means, and in the opposite direction in response to said other state of said control means;

said energizing signal generating means being operable to generate said energizing signal when the count is zero.

6. A system as in claim 5, in which said counting means comprises an up/down counter.

7. A system as in claim 1, in which said counting means comprises at least a units and a tens counter, first gate means responsive to a first state of said control means for connecting said oscillator with said units counter, and a second gate responsive to a second state of said control means for connecting said oscillator with said tens counter.

8. A system as in claim 7, in which said first gate means is responsive to a third state of said control means and said second gate is responsive to a fourth state of said control means for connecting said oscillator with said respective units and tens counters;

said units and tens counters being responsive to said third and fourth states, respectively, to count in a direction opposite to the counting direction when said control means is in said first and second states, and spacing means responsive to a zero count in said units counter for preventing counting by said tens counter until a preselected number of pulses have been transmitted by said transmitting means.

9. A system as in claim 1, in which said control means comprises latching means for producing a latch signal when said control means is in said other state to maintain said oscillator energized.

10. A system as in claim 1, in which said control means comprises a decade counter.

11. A system for registering and transmitting a preselected code to a receiving station comprising switch means operable between open and closed states;

an oscillator responsive to the operation of said switch means to said closed state for producing a plurality of pulses;

an advance signal generator for generating an advance signal when said switch means is operated to the open state;

control means having a plurality of states and being moved from state to state in response to said advance signals;

bi-directional counting means connected to said oscillator for counting and registering said pulses in a first direction in response to a one state of said control means and in the opposite direction in response to another state of said control means;

said counting means generating a signal at an output terminal when the count therein is zero;

display means for displaying the count registered in said counting means;

transmitting means responsive to said other state of said control means for connecting said oscillator to a transmission line; and

lead means connecting said counting means output terminal to said advance signal generator for generating an advance signal to terminate the operation of said transmitting means when a signal is present at said output terminal.

12. A system for registering and transmitting a preselected code to a receiving station comprising register means under control of an operator for registering said preselected code, a central character display connected to said register means for displaying said preselected code, transmitting means for transmitting the contents of said register means to the receiving station, and inhibit means responsive to the operation of said transmitting means for inhibiting operation of said display upon initiation and during transmission of said register means contents.

13. A system as in claim 12, in which said register means comprises a plurality of counters, and a selectively operable oscillator for supplying pulses to said plurality of counters of increment said counters in response to each of said pulses.

14. A system as in claim 13, and control means for sequentially connecting each of said plurality of counters to said oscillator.

15. A system as in claim 13, in which said plurality of counters are each up/down counters.

16. A system as in claim 15, in which said inhibit means is connected to said plurality of counters for supplying a signal thereto to operate said counters in said down direction during transmission of said preselected code.