JPS60225998A - Home security sensor transmission system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention provides a central control panel that adds a control function to the transmitter of each sensor so that the signals from each sensor of a home security system do not cause mutual interference. This relates to a transmission method that allows for accurate capture.

[Prior art]

A conventional device of this type is shown in FIG. In the diagram, (1) is a central control panel, (2) is a speaker installed outdoors, (3) is an emergency push button that transmits information wirelessly, and (4) is a security sensor that also transmits information wirelessly.
(The numeral 51 is a heat sensor that transmits all information wirelessly.

Fig. 2 is a block diagram of a conventional centralized control panel.
oscillation circuit for a), (104) to (110) are light emitting indicators (1b) to (1e), (11) to (Ik) i
The driving circuit (112) is an oscillation drive circuit for the outdoor siren (2).

(113) is 8-pole SW construction T (3H, (
114) is a special specification program FROM, (If
) is the test mode setting switch, (Ig) is the 2-rest mode setting switch, and (1h) is the outing mode setting switch,
(IA is a release switch.

Figure 3 shows an example of signals from each conventional sensor.9
In the figure, (a) is a timing diagram showing the structure of a one word long signal, where one word is 1liQnsec.

(b) is a timing diagram of the signal output of the heat sensor (51),
If the heat sensor +51 operates, it will continuously output the full signal. G
/i is the timing diagram of the signal output of the security sensor (4).

If the security sensor (4) is activated, the pattern of transmitting for 4 seconds and pausing for 56 seconds is repeated. 2) is the signal output timing diagram for the emergency push button (3). When the button is pressed, the signal is transmitted for only 8 seconds.

Conventional security systems are configured as described above. For example, when the heat sensor (51) is activated, at the timing shown in Figure 3 (a) during operation, first the start bit, then the 8-bit house code that can be arbitrarily set for each house, and then the heat sensor (51) is activated. If it is 51, it will be 001.Determine the type of security, 8 bits, and then select the security type.
Send continuously like .

A carrier wave of 50 MHz is often used.

The central control panel (1) receives the radio waves with an installed antenna (1 m), and detects the waves at the receiving section (101).

The output is sent to the microcomputer (102).

When this microcomputer (102) receives the detected signal, it reads an 8-pole switch (113) for setting the house code as a central control panel (1).

Determines the house code in the detected output signal.

If this matches, then the security classification is determined. When they match, the drive circuit (106) is activated to light up the fire indicator (1d) and at the same time the oscillation circuit (103) is activated. ) ', and the oscillation drive circuit (112) is activated to generate the outdoor speaker (21).
It also works by emitting siren sounds and alerting both indoors and outdoors. If you wish to cancel the above information meeting, press the cancel switch (11)'.

The display (Ib), built-in buzzer (1a), and outdoor speaker (2) can be stopped.

If there is an intruder, the distance between the reed switch (4a) for the security sensor (4) and the permanent magnet (4b) will be too far, and the reed switch (4a) will be removed from the security sensor (4).
announces that there has been an intrusion.

The code and the house code are sent via radio waves to the central control panel (11).The timing of the signal at this time is as shown in (c) in Figure 3, and the signal is sent for 4 seconds while the security sensor (4) is operating. Then, the pattern of pausing for 56 seconds is repeated.The central control panel (1) operates in the same way as a heat detector, turning on the security indicator lamp (1b) and at the same time turning on the built-in buzzer (1a) and the outdoor speaker. (2) Sound.To cancel the notification, press the release switch (IJ).

Furthermore, when the emergency push button (3) is activated, the house code and security code are transmitted to the central control panel via radio waves, as shown in the timing shown in Figure M3 (a). The timing at this time is as shown in (2). After the push button is pressed, the message is sent for 8 seconds (50 words). The central control panel (11) operates in the same way as a heat detector, lighting up the emergency indicator lamp (1c) and at the same time sounds the built-in buzzer (1a) and outdoor speaker (2).To cancel the notification, press the release switch (11) Do it with

The above transmissions use the same carrier wave, but each sensor does not synchronize or monitor the output status of other sensors, so two or more sensors may work at the same time. In that case, the first priority in terms of security type is fire caused by heat detector (5), second is security,
The third one is extremely important.

However, if there are multiple sensors of the same security type, and each one operates at the exact same time within a distance of 1 word length (160 m), interference and interference will occur at the timing shown in Figure 3, and the central control panel (11 cannot be analyzed, and there is a drawback that it is not possible to issue a buzzer or a +/- siren alarm.

[Summary of the invention]

This invention was developed in view of the above drawbacks.

By setting a pause period in which the signals from the sensor are not required to be continuous, and randomly setting the time of the pause period of -+: so that even if they operate at the same time, the timing is such that one side can receive it. The aim is to provide a transmission method that can prevent analysis from being impossible due to crosstalk and interference.

[Middle of the Invention mf11] FIG. 4 is a timing diagram showing an embodiment of the present invention, and in FIG. 1, T1 is a period during transmission.

T2+Δt@R(X) is the rest period. Here △
t is usually selected to be 2 words or 32Qmsec * ”(”)
is a random function and is set from 1 to 10. Also, the timing of the heat sensor (5) is T1 k8 seconds T2 k
6.4 seconds, and the timing of the security sensor (4) is T1 is 4 seconds and T2 is 53.4 seconds.

In the security system configured as described above, if only one of the sensors is activated, it will operate and issue an alarm as in the conventional system.

Even if sensors of different security types operate at the same time, the timing of the signal will be different, so reception must be made at the central control panel (11).If the same security building has three sensors, for example heat detectors (5), at the same time When it starts operating, the outputs of the first, second, and third heat sensors will be (E), (E), and (G), respectively, as shown in Figure 5. *
For the first 8 seconds, there will be interference and the central control board (1) will be unable to receive reception, but since the pause period will be set completely at random, the 4th
It can be expected that there will always be a phase shift period as shown in Figure (G). The antenna (1m) installed on the central control panel (11) receives the signal during this period of time, detects the wave at the receiver (101), and sends it to the microcomputer (102). −(
102) receives the detected signal, first performs all house code determination, and ninth, determines the security type.

When the above conditions match and the parity also matches, the drive circuit (1
06) Activate the fire indicator (1d) 'ii and at the same time activate the oscillation circuit (103) and ring the built-in buzzer (1a). Furthermore, the oscillation drive circuit (112
), and the speaker (2) installed outdoors also sounds to notify both indoors and outdoors.

Also, when multiple security sensors operate at the same time, they cause interference for the first 4 seconds, similar to the case with the heat detector above.
Although the central control panel (1) will be unable to receive data, since the 9th pause period can be expected to be different for each sensor, the central control panel +11 will be able to receive and report.

In this way, there is a general rest period for each sensor output.

By setting the resting period to some extent randomly,
Even if a plurality of sensors start operating at exactly the same time, the above-mentioned downtime is different for each sensor, so the central control panel can receive and report an abnormality during the time difference.

〔Effect of the invention〕

As described above, according to the present invention, even when a plurality of sensors start operating at exactly the same time, information can be accurately transmitted and reported based on priority, and a device suitable for a security system can be obtained. It is something that

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a conventional security system. Figure 2 is a block diagram of the security system, Figure 3 is a sensor transmission code timing diagram, and Figure 4 is a block diagram of the security system.
The figure is a transmission code timing diagram showing one embodiment of the present invention, and FIG. 5 is also a transmission code timing diagram of a heat sensor. (1) is the central control panel, emergency push button, (4) is the security sensor + (51 is the heat detector). In each figure, the same reference numerals indicate corresponding parts. Fang III b I, M Figure 2 Figure 3

Claims (1)

[Claims] A plurality of sensors consisting of various sensors such as heat detectors, smoke detectors, security sensors, or emergency push buttons transmit information wirelessly, and information from these sensors is received and In a home security system having a centralized control panel, each sensor is equipped with a means to control the output wireless signal of each sensor to minimize mutual interference of wireless signals from multiple sensors. - A home security sensor transmission method with % characteristics.