JPS6116397A - Security system - Google Patents

Abstract

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

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to security systems, and in particular to a method for receiving signals provided by sensors.

[Prior art]

Conventionally, when an abnormality such as a fire outbreak or gas leak is detected,
Security systems that notify the occurrence of an abnormality are known.

FIG. 1 shows a home security system according to the prior art.

In the figure, ■ is a sensor such as a fire sensor, and sensor 1 functions as a normally open switch that turns on when it detects an abnormality, one terminal IA is grounded, and the other terminal IB is connected to power supply ■1. . Here, the sensor 1 is at the power supply potential (state "1") under normal conditions, and at the ground potential (state "1") during abnormal conditions.
The state becomes "0").

Further, 2 is a transmitter connected to the other terminal IB of the sensor 1, and the transmitter 2 is configured to transmit a predetermined transmission code when the sensor 1 detects an abnormality and becomes in the state "0". It has become. 3 is a receiving section coupled to the transmitting section 2 by wireless means, and 4 is a receiving section in which the signal received by the receiving section 3 is in the state "
This is an interface unit that decodes whether the state is "0" or "1".

Reference numeral 5 denotes a separator, into which a signal from the interface unit 4 is inputted to a wireless input terminal 5A as a first terminal, and a wired input terminal 5B as a second terminal.
state “0” from the sensor 1 via the wired means 6.
Alternatively, a signal indicating the state "1" is inputted, and a power supply (2) is connected to the output terminal 5C.

Reference numeral 7 denotes a signal input section into which a signal is input from the separator 5, and 8 is a control section into which a signal is input from the signal input section 7. The control section 8 controls the display section 9.

The security system according to the prior art is configured as described above, and its operation will be explained next.

First, as shown in the figure, the disconnector 5 connects to the wired input terminal 5B.
Suppose that you are switching to

However, if an abnormality such as a fire occurs in this state, the sensor 1 that detects this will send a signal indicating the state "0" to the wired means 7. In order to output to the input signal section 7 via the separator 5,
The control unit 8 operates the display unit 9 to notify that an abnormality has occurred.

On the other hand, when the disconnector 5 is switched to the wireless input terminal 5A, the signal indicating the state "0" outputted by the sensor 1 is transmitted to the transmitter 2. Receiving section 3. Interface part 4.
Separator 5. It is manually input to the control unit 8 via the signal input unit 7,
The control unit 8 notifies that an abnormality has occurred by operating the display unit 9.

However, in the conventional security system configured as described above, whether reception from the sensor 1 is performed by the wired means 6 or the wireless means is determined by manually switching the disconnector 5.
In the unlikely event that the selected means is out of conduction due to a failure or the like, it has the disadvantage that it cannot notify that an abnormality has occurred.

[Summary of the invention]

The present invention has been made in view of the above drawbacks, and by providing a gate circuit that takes the logical sum of the respective signals supplied to the first terminal and the second terminal and supplies it to the control means, it is possible to To provide a security system that can accurately notify that an abnormality has occurred even when any one of the devices is in an inactive state.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3. FIG. 2 shows a first embodiment.

Note that the same components as those in the prior art are given the same reference numerals, and the description thereof will be omitted.

However, 11 indicates a NOR circuit as a gate circuit provided as a substitute for the divider 5 of the prior art, and the NOR circuit 11 calculates the logical sum of values inputted via the wired means 6 and the wireless means. .

Therefore, in the present invention, when the sensor 1 detects an abnormality and outputs a signal indicating the status "0", the display is displayed even if either the wired means 6 or the wireless means is in an inoperable state due to a failure or the like. The department 9 can accurately notify that fact.

Further, FIG. 3 shows a second embodiment of the present invention.

The feature of this embodiment is that a plurality of sensors 21 are provided.
Back 5 Yes.

In this case, since the signal that each sensor 21 outputs when it detects an abnormality is set to be unique for each sensor, the signal from each sensor 21 is sent to the receiving section 25, interface section 26, signal input section 27, The display section 24 corresponding to each sensor 21 can operate accurately without interference in the control section 28.

[Effect of idea]

As explained above, according to the present invention, since the gate circuit is provided which takes the logical sum of the respective signals supplied to the first terminal and the second terminal and supplies it to the control means, either the wired means or the wireless means can be used. Even if the system becomes inoperative due to a failure or the like, it is possible to accurately notify that an abnormality has occurred.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a security system according to the prior art, FIGS. 2 and 3 are block diagrams of a security system according to the present invention, FIG. 2 is a first embodiment, and FIG. 3 is a block diagram of a security system according to the present invention. Example 2 is shown below. 1.21...Sensor, 5A...Wireless input terminal (first terminal), 5B...Wired input terminal (second terminal)
terminal), 8.28...control means, 9.24...display section, 11.23...NOR circuit (gate circuit). Note that the same reference numerals are used for the same or equivalent parts. Agent Masuo Oiwa (and 2 others) Figure 1

Claims (1)

[Claims] a first in which the output signal of the sensor is provided via wireless means;
a terminal, a second terminal to which the output signal of the sensor is supplied via wired means, and the output signal of the sensor supplied to the first terminal or the second terminal is input, and the display unit is controlled based on the signal. What is claimed is: 1. A security system comprising a control means for controlling the first terminal and the second terminal, the security system further comprising a gate circuit which takes a logical sum of respective signals supplied to the first terminal and the second terminal and supplies the logical sum to the control means.