JPH11144175A - Thermal sensor, beam sensor and security device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically detect the power supply voltage abnormality of a thermal sensor and a beam sensor and light receiving level abnormality that is caused by the sight deviation of the beam sensor and to quickly perform maintenance. SOLUTION: The thermal sensor S and a light receiver R perform polling with the security device 1. The sensor S and the receiver R notify to the device 1 when power supply voltage falls below threshold. The receiver R notifies to the device 1 when a light receiving level falls below threshold. It is also acceptable that the sensor S and the receiver R notify power supply voltage value and that the device 1 side detects the existence of power abnormality. Similarly, it is also acceptable that the receiver R notifies light receiving level value and that the device 1 side detects light receiving level abnormality. In this way, it is possible to automatically and quickly detect power supply voltage abnormality and light receiving level abnormality of the receiver R.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to easy maintenance of a heat ray sensor and a beam sensor.

[0002]

2. Description of the Related Art There is known a security system for detecting an intruder using a hot-wire sensor or a beam sensor.

In such a security system, the power supply of the hot-wire sensor and the beam sensor is provided by a power supply line laid from a security device to which the hot-wire sensor and the beam sensor are connected, or separate from the security device. Power is usually supplied from a power supply line laid from the power supply device, but the power supply voltage supplied to the hot-wire sensor and the beam sensor decreases for various reasons such as corrosion of the power supply line and leakage. Sometimes. Such a decrease in the power supply voltage is a very important problem. The reason is that when the power supply voltage decreases, the hot-wire sensor and the beam sensor do not operate, so that security cannot be performed.

However, in the past, such a phenomenon that the power supply voltage dropped was found only at the time of periodic inspection work.

[0005] Further, particularly in a security system using a beam sensor, the aiming of the light emitter and the light receiver of the beam sensor may gradually shift. In other words, when installing the beam sensor, the work of aiming the emitter and the receiver is performed, and the receiver receives a sufficient light reception level, but if an earthquake or small vibration is repeatedly applied over time. The aim of the light emitter and the light receiver gradually shifts.

[0006] It is clear that the misalignment of the aiming between the light emitter and the light receiver in such a beam sensor is not preferable. This is because if the aiming of the light emitting device and the light receiving device deviates, the light receiving level at the light receiving device becomes small, and the light receiving device always outputs a signal indicating that an object has been detected.

However, in the past, such a deviation in aiming of the beam sensor has only been found at the time of periodic inspection work.

Accordingly, the present invention has been made in view of the circumstances described above,
It is an object of the present invention to automatically and immediately detect a drop in power supply voltage supplied to a hot-wire sensor or a beam sensor, or a shift in aiming in a beam sensor.

[0009]

According to a first aspect of the present invention, there is provided a hot-wire sensor according to the first aspect, which outputs a signal indicating that the power supply voltage has decreased when the power supply voltage falls below or below a threshold value. It is characterized by outputting.

According to a second aspect of the present invention, there is provided a hot-wire sensor capable of communicating with a security device, wherein the hot-wire sensor transmits at least a power supply voltage value when accessed from the security device.

According to a third aspect of the present invention, the beam sensor outputs a signal indicating that the power supply voltage has decreased when the power supply voltage becomes equal to or lower than the threshold value or lower than the threshold value.

According to a fourth aspect of the present invention, there is provided a beam sensor capable of communicating with a security device, wherein the beam sensor transmits at least a power supply voltage value when accessed from the security device.

According to a fifth aspect of the present invention, the beam sensor outputs a signal indicating that the light receiving level has decreased when the light receiving level falls below the threshold value or falls below the threshold value.

According to a sixth aspect of the present invention, there is provided a beam sensor which is capable of communicating with a security device, and transmits at least a light receiving level value when accessed from the security device.

A security device according to a seventh aspect of the present invention is a security device capable of communicating with a hot-wire sensor and / or a beam sensor, and receives a signal indicating that the power supply voltage has dropped from the hot-wire sensor and / or the beam sensor. In this case, the center device is informed that the power supply voltage of the heat ray sensor and / or the beam sensor has dropped.

According to another aspect of the present invention, there is provided a security device capable of communicating with a hot-wire sensor and / or a beam sensor, wherein the security device receives a signal indicating that a power supply voltage has dropped from the hot-wire sensor and / or the beam sensor. In this case, the display means displays an indication that the power supply voltage of the heat ray sensor and / or the beam sensor has decreased.

A security device according to a ninth aspect is a security device capable of communicating with a beam sensor, wherein when a signal indicating that the light receiving level has decreased is received from the beam sensor, the security device is transmitted to the center device. It is characterized in that the fact that the light receiving level of the beam sensor has decreased is reported.

According to a tenth aspect of the present invention, there is provided a security device communicable with the beam sensor, wherein when a signal indicating that the light receiving level has decreased is received from the beam sensor, the display means displays the beam sensor. Is displayed to indicate that the light receiving level is lowered.

A security device according to an eleventh aspect is a security device capable of communicating with a hot-wire sensor and / or a beam sensor, and receives a power supply voltage value from the hot-wire sensor and / or the beam sensor. It is characterized in that it is detected whether or not the power supply voltage value is abnormal.

According to a twelfth aspect of the present invention, there is provided a security device capable of communicating with a beam sensor, wherein when a light reception level value is received from the beam sensor, whether or not the received light level value is abnormal. Is detected.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a hot-wire sensor according to the present invention;
FIG. 2 is a diagram showing a first embodiment of a security system constructed using a beam sensor and a security device, FIG. 2 is a diagram showing a first embodiment of a hot-wire sensor according to the present invention, and FIG. 3 is a beam sensor according to the present invention 1 is a diagram showing a first embodiment of a light receiver, wherein 1 is a security device, 2 is a main control unit, 3 is a communication control unit, 4 is a line control unit, 5 is a setting device, and 6 is a telephone line. , 1
0 is a sensor head, 11 is a signal processing unit, 12 is a control unit,
13 is a communication control unit, 14 is a power supply circuit, 15 is a comparator, 1
9 is a power supply line, 20 is a sensor head, 21 is a signal processing unit,
22 is a control unit, 23 is a communication control unit, 24 is a comparator, 25
Is a power supply circuit, 26 is a comparator, 29 is a power supply line, L is a communication line, S is a hot-wire sensor, R is a light-receiving device of a beam sensor (hereinafter simply referred to as a light-receiving device), and T is a light emitting device of a beam sensor (hereinafter, referred to as a light-receiving device). Simply called a floodlight).

First, the security device 1 will be described. The main control unit 2 is composed of a processing unit including a CPU and its peripheral circuits, and manages the operation of the security device 2 in an integrated manner. The communication control unit 3 is for performing communication by polling with each of the heat ray sensors S and each of the light receivers R. Each of the heat ray sensors S and each of the light receivers R at a predetermined time or at a predetermined time. Are sequentially accessed, and the data sent from the heat ray sensor S and the light receiver R are received and passed to the main control unit 2. The line control unit 4 is for mutually communicating with a center device disposed at a security center or the like of a security company via the telephone line 6. Although only one loop of the hot-wire sensor and one loop of the beam sensor are shown in FIG. 1, this is for the sake of simplicity of the drawing. It is something that is possible.

An operating device 5 is connected to the main control unit 2.
This operating device 5 is for switching the guard state of the guard area in which the heat ray sensor S and the beam sensor are arranged, that is, for switching from the guard state to the release state or for switching from the release state to the guard state. And
Usually, it is called a remote controller or the like. Although the operation device 5 is separate from the security device 1 in FIG. 1, the operation device 5 may be integrated.

It should be noted that the security device 1 can be provided with a siren or the like for intimidating an intruder, but these are not essential matters in the present invention, and therefore description thereof is omitted.

A plurality of heat ray sensors S and a plurality of light receivers R are connected to the communication line L. The receiver R is the projector T
Of course, it is installed facing. Further, the heat ray sensor S is installed inside the building, and the projector T and the receiver R
Is usually installed outdoors. In addition, here, one area including the area guarded by the heat ray sensor S and the area guarded by the beam sensor including the light emitter T and the light receiver R is defined as one security area. 5 shall be performed.

The heat ray sensor S has the configuration shown in FIG. The sensor head 10 includes a pyroelectric element and its circuit system, an optical system such as a reflecting mirror for forming a warning zone, and the like. Since the configuration of the sensor head 10 is well known, a detailed description is omitted.

A signal from the sensor head 10 is input to a signal processing unit 11. The signal processing unit 11 includes the sensor head 10
The processing for detecting the presence or absence of a moving object is performed based on a signal from the control unit 12. When it is determined that there is a moving object, an alarm signal is output to the control unit 12. The process of detecting the presence or absence of a moving object based on a signal from the sensor head 10 is well-known, and a detailed description thereof will be omitted. And the control unit 1
2 receives the alarm signal from the signal processing unit 11, stores the number of times the alarm signal has been received in an internal memory (not shown in FIG. 2). The communication control unit 13 is for performing communication by polling with the communication control unit 3 of the security device 1.

The power required by the hot-wire sensor S is supplied to the power supply circuit 14 from a power supply line 19 laid from the security device 1 or a specially provided power supply device, and is supplied from the power supply circuit 14 to each unit requiring power supply. It has been made.
The power supply voltage from the power supply line 19 is input to the comparator 15 and compared with a threshold. This threshold is fixedly set to the comparator 15
May be provided from the center device or the security device 1 here. That is, the threshold value is provided from the center device to the main control unit 2 of the security device 1 via the telephone line 6, and the main control unit 2 transmits the threshold value to the communication line
Is given to the control unit 12 of each heat ray sensor S by the polling communication via the control unit, and the threshold value is given from the control unit 12 to the comparator 15.

When the power supply voltage falls below or below the threshold, the comparison section 15 outputs a power supply abnormality signal to the control section 12. Then, when receiving the power supply abnormality signal from the comparator 15, the control unit 12 stores the power supply abnormality in the internal memory.

When the communication control unit 13 is accessed from the communication control unit 3 of the security device 1, the communication control unit 13
Notify. At this time, the control unit 12 transmits the contents stored in the internal memory by the communication control unit 13 as a reply, and clears the internal memory. Therefore, if the number of alarms is n (n is a non-negative integer) from the last access to the current access and there is no power failure, data indicating this is transmitted as a reply, and If the number of alarms is n and the power supply is abnormal before the access, the data to that effect is transmitted as a reply. The communication control unit 13 of the heat ray sensor S
When transmitting data to the communication control unit 3 of the security device 1, it is natural that an address assigned to itself is added.

By such an operation, each heat ray sensor S
The information on the number of alarms and the presence / absence of a power failure are received by the communication control unit 3 and passed to the main control unit 2.

The light receiver R of the beam sensor has the structure shown in FIG. The projector T may be the same as the conventional one. The sensor head 20 includes a light receiving element for receiving infrared light emitted from the light projector T, a circuit system thereof, an optical system such as a reflecting mirror, and the like. Since the configuration of the sensor head 20 is well known, a detailed description is omitted.

The signal from the sensor head 20 is input to the signal processing section 21. The signal processing unit 21 includes the sensor head 20
The processing for detecting the presence or absence of an object is performed based on the signal from the controller. When it is determined that the object is present, an alarm signal is output to the control unit 22. The process of detecting the presence / absence of an object based on a signal from the sensor head 20 is well known, and thus a detailed description is omitted. When receiving the alarm signal from the signal processing unit 21, the control unit 22 stores the number of times the alarm signal has been received in an internal memory (not shown in FIG. 3).

The communication control section 23 is for performing communication with the communication control section 3 of the security device 1 by polling.

The signal from the sensor head 20 is supplied to a comparator 24
And is compared with a threshold. Since the signal from the sensor head 20 indicates the light receiving level, the comparator 2
No. 4 compares the light receiving level with a threshold. This threshold value may be fixedly given to the comparator 24, but here, like the threshold value given to the comparator 15 of the heat ray sensor S, is given from the center device or the security device 1. That is, the threshold value is provided from the center device to the main control unit 2 of the security device 1 via the telephone line 6 or directly to the main control unit 2 of the security device 1, and further, the threshold value is transmitted from the main control unit 2 via the communication line L. The threshold value is given to the control unit 22 of each light receiver R by polling communication, and the threshold value is given from the control unit 22 to the comparator 24.

When the light receiving level from the sensor head 20 becomes equal to or less than the threshold value, the comparing section 24 outputs a light receiving level abnormal signal to the control section 22. When the control unit 22 receives the light reception level abnormality signal from the comparator 24,
The received light level abnormality is stored in the internal memory.

The alarm signal of the beam sensor is generated by a remarkable decrease in the light receiving level, and the threshold of the light receiving level described here is higher than the threshold of the alarm signal. For this reason, as a means for discriminating a light reception level abnormal signal that will output a transient state until the alarm signal is output from the alarm signal, the light level abnormal signal is used for a certain period of time. It shall be output when the above is continued.

The power required for the photodetector R is a security device 1
Alternatively, power is supplied to a power supply circuit 25 from a power supply line 29 laid from a power supply device provided in particular, and power is supplied from the power supply circuit 25 to each of the necessary parts. The power supply voltage from the power supply line 29 is input to the comparator 26 and compared with a threshold. This threshold value may be fixedly given to the comparator 26, but is given here from the center device or the security device 1 like the threshold value given to the comparator 24.

When the power supply voltage falls below or below the threshold value, the comparison section 26 outputs a power supply abnormality signal to the control section 22. When receiving the power supply abnormality signal from the comparator 26, the control unit 22 stores the power supply abnormality in the internal memory.

When the communication control unit 23 is accessed by the communication control unit 3 of the security device 1, the communication control unit 23
Notify. At this time, the control unit 22 transmits the contents stored in the internal memory by the communication control unit 23 as a reply, and clears the internal memory. Therefore, if the number of alarms is m (m is a non-negative integer) times from the previous access to the current access, and if there is no light reception level abnormality or power supply abnormality, data to that effect is transmitted as a reply. If the number of alarms from the access to the current access is m, there is no light reception level abnormality, and there is a power supply abnormality, data to that effect is transmitted as a reply. Further, if the number of alarms is m from the previous access to the current access, there is a light reception level abnormality, and there is no power supply abnormality, data indicating this is transmitted as a reply. The communication control unit 23 of the light receiver R
When transmitting data to the communication control unit 3 of the security device 1, it is natural that an address assigned to itself is added.

By such an operation, information on the number of alarms from each photodetector R, the presence / absence of a light reception level abnormality, and the presence / absence of a power supply abnormality are received by the communication control unit 3 and passed to the main control unit 2. .

Next, the overall operation of the security system shown in FIG. 1 will be described. Now, assuming that the operating device 5 has been operated to switch from the alert state to the release state, the main control unit 2 notifies the center device via the telephone line 6 that the state has entered the release state from the alert state. report. Thereby, the person in charge of the center device can know that the guard area has been released.

The main control unit 2 accesses each heat ray sensor S and each light receiver R at predetermined time intervals or at predetermined time intervals by the communication control unit 3 to collect information even in the alert state.

Regarding the heat ray sensor S, if the number of alarms is zero even after accessing the predetermined number of times, it is determined that an abnormality has occurred, and the address of the heat ray sensor S and the heat ray sensor abnormality are determined. To the center device.

Such processing is performed for the following reason. That is, in the release state, it is considered that there is considerable movement of a person. Therefore, it is natural that the number of alarms sent from the hot-wire sensor S is not zero, and the number of alarms Is zero because it is considered that some abnormality has occurred in the heat ray sensor S and it is not operating normally.

Thus, the person in charge of the center device can immediately know which heat ray sensor S is abnormal, and can take appropriate measures promptly.

When the main controller 2 receives a power supply abnormality from the heat ray sensor S or the light receiver R, the main controller 2 attaches the address of the heat ray sensor S or the light receiver R which has transmitted the power supply abnormality to notify that the power supply abnormality has occurred. Notify the center device. As a result, the person in charge of the center device can immediately and clearly know which heat ray sensor S or which light receiver R has a power supply abnormality, and can take appropriate measures promptly.

Further, when the main control unit 2 receives the light receiving level abnormality from the light receiving unit R, the main control unit 2 attaches the address of the light receiving unit R which has transmitted the light receiving level abnormality and notifies the center device that the light receiving level abnormality has occurred. . As a result, the person in charge of the center device can immediately and clearly know which light receiver R the light receiving level is decreasing, so that appropriate measures can be taken promptly.

In the released state, the main control unit 2 does not determine that there is an intruder even if it receives a non-zero number of alarms from the heat ray sensor S or the light receiver R. Because, as described above, there is a movement of the person in the released state,
This is because it is natural to receive a non-zero number of alarms from the heat ray sensor S or the light receiver R.

Next, the operation in the case where the operating device 5 is operated to switch from the release state to the alert state will be described. When the state is switched from the release state to the alert state, the main control unit 2 notifies the center apparatus that the state has entered the alert state from the release state. This allows the person in charge of the center device to know that the guard area has become alert.

In the alert state, when a non-zero number of alarms is received from the heat ray sensor S or the light receiver R, the main controller 2 immediately determines that there is an intruder,
Notifies the intruder abnormality to the center device. At this time, the heat ray sensor S or the light receiver R that has sent the non-zero number of alarms
Of course. This enables the person in charge of the center device to know at which point in the guard area the intruder has been detected, so that appropriate measures can be taken promptly.

Next, in the alert state, the main control unit 2 receives a power supply abnormality from the heat ray sensor S or the light receiver R and a light reception level abnormality from the light receiver R. In this case, the following two modes are considered as modes of the operation of the main control unit 2. One aspect is to notify the center device immediately when these power supply abnormalities or light receiving level abnormalities are received. But,
In the alert state, the center device first needs to deal with the intruder abnormality. In such a situation, even if the power supply abnormality or the light reception level abnormality is reported, it may not be possible to take immediate action. Conceivable. Further, it is naturally desirable that the power supply abnormality and the light reception level abnormality can be dealt with promptly. However, even if the power supply abnormality and the light reception level abnormality occur, the heat ray sensor S and the light receiver R do not immediately stop operating. Thus, as a second mode, when the main control unit 2 receives a power supply abnormality or a light reception level abnormality while in the alert state, the main unit 2 is not immediately notified to the center device but is released by the operation device 5 next. When the state is switched, the power supply abnormality and the light reception level abnormality may be reported to the center device together with the information indicating that the state has been switched to the release state. Which mode is adopted is arbitrary.

As described above, according to this security system, maintenance of the beam sensor including the heat ray sensor S and the light receiver R can be performed quickly.

The first embodiment has been described above. Next, a second embodiment of the security system constructed using the hot-wire sensor, the beam sensor and the security device according to the present invention will be described. The overall block configuration of the security system according to the second embodiment of the present invention is the same as that of FIG. 1, but the operations of the hot-wire sensor S, the light receiver R, and the main control unit 2 of the security device 1 are different.

FIG. 4 shows a configuration example of the heat ray sensor S used in the security system of the second embodiment, and FIG. 5 shows a configuration example of the light receiver R used in the security system of the second embodiment. 4 and 5, 30, 31, and 32 are A
2 shows a / D converter (hereinafter, referred to as an ADC). 4 and 5, the same components as those in FIGS. 2 and 3 are denoted by the same reference numerals, and redundant description will be omitted.

First, the heat ray sensor S will be described. In the hot-wire sensor S, the power supply voltage supplied from the power supply line 19 is digitized by the ADC 30 at predetermined intervals. The control unit 12 takes in the digitized power supply voltage value and stores it in the internal memory. At this time, the power supply voltage value acquired this time may be overwritten on the previous power supply voltage value. Further, when receiving the alarm signal from the signal processing unit 11, the control unit 12 stores the number of times the alarm signal has been received in the internal memory.

When the control unit 12 receives a notification from the communication control unit 13 that the security device 1 has accessed, the number of alarms and the power supply voltage value stored in the internal memory are used as a response to the access. Send.

Upon receiving the data from the hot-wire sensor S, the main control unit 2 of the security device 1 compares the received power supply voltage value with a threshold value to determine whether or not the power supply is abnormal, and determines that the power supply is abnormal. In this case, report the power supply abnormality to the center device. At this time, it is natural that the address of the heat ray sensor S in which the power supply abnormality has occurred is also reported. The threshold value may be downloaded from the center device and set as in the first embodiment, or may be fixedly set in the main control unit 2. Further, by providing a means for displaying the received power supply voltage value and received light level value, it is possible to confirm detailed information on the power supply abnormality and the received light level abnormality.

That is, in the above-described first embodiment, the presence or absence of a power supply abnormality is determined on the heat ray sensor S side.
In the embodiment, the security device 1 determines whether there is a power supply abnormality. Other points are the same as those in the first embodiment.

The same applies to the light receiver R. That is, in the light receiver R, the light receiving level from the sensor head 20 is digitized by the ADC 31 at predetermined intervals, and the power supply voltage supplied from the power supply line 29 is digitized by the ADC 32 at predetermined intervals. Each is taken into the control unit 22 and stored in the internal memory. At this time, the power supply voltage value and the light receiving level value which are taken in this time may be overwritten on the previous power supply voltage value and the light receiving level value. Further, upon receiving the alarm signal from the signal processing unit 21, the control unit 22 stores the number of times the alarm signal has been received in the internal memory.

When the control unit 22 receives from the communication control unit 23 a notification that the security device 1 has been accessed, the control unit 22 accesses the number of alarms, the power supply voltage value, and the light receiving level value stored in the internal memory. Sent as a response to.

Upon receiving the data from the light receiver R, the main control unit 2 of the security device 1 compares the received power supply voltage value and received light level value with predetermined thresholds to determine whether there is a power failure.
Then, it is determined whether or not the light receiving level is abnormal. If it is determined that the power supply is abnormal, if it is determined that the light receiving level is abnormal, the power supply abnormality and the light receiving level abnormality are notified to the center device. At this time, it is natural that the address of the light receiver R in which the power supply abnormality or the light reception level abnormality has occurred is also reported. Note that these thresholds may be downloaded from the center device and set as in the first embodiment, or may be fixedly set in the main control unit 2. Further, by providing a means for displaying the received power supply voltage value and received light level value, it is possible to confirm detailed information on the power supply abnormality and the received light level abnormality.

As described above, in the first embodiment,
The presence or absence of the power supply abnormality and the presence or absence of the light reception level abnormality are determined on the light receiver R side, but in the second embodiment, the security device 1 side is configured to perform the determination. Other points are the same as those in the first embodiment.

As described above, it is apparent that maintenance of the beam sensor including the hot-wire sensor S and the light receiver R can be performed quickly even by this security system.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.
Various modifications are possible. For example, in the above embodiment, a security system using a hot-wire sensor and a beam sensor is taken as an example, but the present invention is not limited to such a system, and a security system or a beam using only a hot-wire sensor is used. It will be apparent that the present invention can be applied to a security system using only sensors.

In the above embodiment, the security device 1 is communicable with the center device. However, the security device 1 may not be communicable with the center device. However, in that case, intruder abnormality, power supply abnormality,
Obviously, it is necessary to provide a type of abnormality such as an abnormal light reception level, and a means for displaying a heat ray sensor or a photodetector which has caused the abnormality.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of a security system constructed using a heat ray sensor, a beam sensor, and a security device according to the present invention.

FIG. 2 is a view showing a first embodiment of a heat ray sensor according to the present invention.

FIG. 3 is a diagram showing a first embodiment of a light receiver of the beam sensor according to the present invention.

FIG. 4 is a view showing a second embodiment of the heat ray sensor according to the present invention.

FIG. 5 is a view showing a second embodiment of the light receiver of the beam sensor according to the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 security device 2 main control unit 3 communication control unit 4 line control unit 5 setting device 6 telephone line 10 sensor head 11 signal processing unit 12 control unit 13 .. Communication control unit, 14 power supply circuit, 15 comparator, 19 power line, 20 sensor head, 21 signal processing unit, 22 control unit, 23 communication control unit, 24 comparator, 25 power supply Circuit, 26 ... Comparator, 29 ... Power line, L ... Communication line, S ...
Heat ray sensor, R: light receiver of beam sensor, T: light emitter of beam sensor.

Claims (12)

[Claims] 1. A hot-wire sensor which outputs a signal indicating that the power supply voltage has dropped when the power supply voltage becomes equal to or lower than the threshold value or lower than the threshold value. 2. A hot-wire sensor capable of communicating with a security device, wherein the hot-wire sensor transmits at least a power supply voltage value when accessed from the security device. 3. A beam sensor, which outputs a signal indicating that the power supply voltage has dropped when the power supply voltage becomes equal to or lower than a threshold value or lower than the threshold value. 4. A beam sensor communicable with a security device, wherein the beam sensor transmits at least a power supply voltage value when accessed from the security device. 5. A beam sensor which outputs a signal indicating that a light receiving level has decreased when the light receiving level has become equal to or less than a threshold value or less than the threshold value. 6. A beam sensor communicable with a security device, wherein the beam sensor transmits at least a light receiving level value when accessed from the security device. 7. A security device capable of communicating with a hot-wire sensor and / or a beam sensor, wherein the center device receives a signal indicating that the power supply voltage has dropped from the hot-wire sensor and / or the beam sensor. A security device for notifying the user that the power supply voltage of the heat ray sensor and / or the beam sensor has dropped. 8. A security device communicable with a hot-wire sensor and / or a beam sensor, wherein when a signal indicating that the power supply voltage has dropped is received from the hot-wire sensor and / or the beam sensor, a display means. Heat ray sensor and / or
Alternatively, a security device that performs display indicating that the power supply voltage of the beam sensor has decreased. 9. A security device capable of communicating with a beam sensor, wherein when a signal indicating that the light reception level has decreased is received from the beam sensor, the light reception level of the beam sensor decreases with respect to the center device. A security device for notifying the user that he / she is in the office. 10. A security device capable of communicating with a beam sensor, wherein when a signal indicating that the light reception level has decreased is received from the beam sensor, the light reception level of the beam sensor decreases on the display means. A security device that displays an indication that the security device is in use. 11. A security device capable of communicating with a hot-wire sensor and / or a beam sensor, wherein when a power-supply voltage value is received from the hot-wire sensor and / or the beam sensor, the power-supply voltage value is abnormal. A security device, which detects whether or not the security device is operating. 12. A security device capable of communicating with a beam sensor, wherein when receiving a light reception level value from the beam sensor, the security device detects whether the light reception level value is abnormal. Security equipment to do.