JPH1049764A - Monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring system in which it is necessary only to provide a common detecting part at a monitoring side regardless of the classification of plural tag sensors 7 to be used, and it is possible to reduce manufacturing costs. SOLUTION: This system is provided with plural tag sensors 7 respectively arranged at plural parts to be monitored with different monitoring classifications which detect the states of the parts to be monitored by resistance values, plural resistance value judging parts 6 connected with the plural tag sensors 7 which judge the resistance values detected by the plural tag sensors 7, and output judgment signals, and monitoring part main body 1 which selectively and successively receives the judgment signals outputted by the plural resistance value judging parts 6, and operates the display of an abnormal state when the received judgment signal is abnormal. The plural tag sensors 7 are selected so that the normal ranges of the resistance values can be made almost coincident.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring system, and more particularly, to a case where a plurality of monitored units having different types of monitoring are commonly monitored in a monitoring unit main body in a building or the like, a tag sensor is provided for each monitored unit. The present invention relates to a monitoring system provided to detect a state of a monitored part corresponding to each tag sensor by a resistance value and to select a normal range of the resistance value so as to substantially match each other.

[0002]

2. Description of the Related Art Generally, in a building or the like, when a plurality of monitored parts having different monitoring types are monitored by a common monitoring device, a building monitoring system is used.

In this case, known building monitoring systems include:
Although many types have been proposed, a typical one is to dispose various sensors such as an infrared sensor, a temperature sensor, a smoke sensor, a glass breakage sensor, etc. in each monitored part, and to use these sensors. Connected to a common monitoring device via a transmission means such as a cable, and when an abnormality is detected in any of the sensors, the common monitoring device responds to the detection of the abnormality, and displays or alerts the abnormality, It is configured to notify which monitored unit has an abnormality.

Separately from such a building monitoring system, in a large-scale retail store or the like, tags having built-in resistors are attached to displayed products, and these tags are connected to a common monitoring unit main body via a lead wire. When the tag is removed from the displayed product, the resistance of the built-in resistor of the tag changes greatly, and the common monitoring unit detects the change in the resistance value and indicates that the tag has been removed from the displayed product. Alternatively, a theft monitoring device that is notified by an alarm has already been proposed by the same applicant as the present patent application,
One example is disclosed in Japanese Patent Application No. 7-51214.

FIG. 6 is a block diagram showing a schematic configuration of a theft monitoring device disclosed in Japanese Patent Application No. 7-51214.

[0006] As shown in FIG.
It comprises a tag 61 and a monitoring unit main body 62. In this case, the tag 61 has a built-in resistor 63 and a pair of cables 6
4 are connected. The monitoring unit main body 62 includes a connector 65.
, Differentiating circuit 66, determining circuit 67, latch circuit 68
, A square wave generation circuit 69, and an alarm circuit 70. In this case, the tag 61 is connected to the monitoring unit main body 62 via the pair of cables 64 and the connector 65. In the monitoring unit main body 62, one of the pair of cables 64 is grounded, and the other is connected to the power supply terminal Vcc via the resistor R1. The differentiating circuit 66, the determining circuit 67, the latch circuit 68, the square wave generating circuit 69, and the alarm circuit 70 each have a circuit configuration as shown in FIG.

[0007] The antitheft device having the above-described structure operates roughly as follows.

When the tag 61 is detached from the displayed product and the pair of cables 64 is damaged or cut by removing the tag 61, the resistance value of the tag 61 including the built-in resistor 63 is reduced. Increase. The input / output voltage of the differentiation circuit 66 increases due to the increase in the resistance value of the tag 61, and the increased output voltage is input to the determination circuit 67. At this time, when the input voltage exceeds the upper threshold voltage value set by the voltage dividing resistors R4 and R5, the determination circuit 67 changes the output voltage of the first comparator U1 to the previous low level (L), that is, The voltage is raised from the ground voltage to a high level (H), that is, the power supply voltage Vcc, and the high level (H) is supplied to the latch circuit 68 via the diode D1.
Supplied to The latch circuit 58 is set by the supplied high level, and a high level (H) set signal is supplied to the square wave generation circuit 69. Square wave generation circuit 69
Is connected to the transistor Q3 in response to the supplied set signal.
, A low-level (L) square wave signal is generated at the base, and the supply of this square wave signal turns on the transistor Q3 to operate the alarm circuit 70 such as a buzzer.

On the other hand, if the pair of cables 64 is short-circuited by removing the tag 61 from the tag 61 attached to the displayed product, the resistance value of the tag 61 including the built-in resistor 63 is drastically reduced. Due to the decrease in the resistance value of the tag 61, the input / output voltage of the differentiation circuit 66 decreases,
The reduced output voltage is input to the determination circuit 57. At this time, when the input voltage exceeds the lower limit threshold voltage value set by the voltage dividing resistors R6 and R7, the determination circuit 67
The output voltage of the second comparator U2 is changed from the previous low level (L), that is, the ground voltage to the high level (H), that is,
The voltage is raised to the power supply voltage Vcc, and this high level (H) is supplied to the latch circuit 68 via the diode D1. The operation thereafter is the same as in the case described above.

In the conventional anti-theft device, when it is desired to increase the number of attached tags 61, the differentiating circuit 6
6 and a determination circuit 67 (indicated by a dotted line in FIG. 6) are connected in parallel to the input side of a latch circuit 68, and connected to a connector 65 on the input side of the connected circuit portion via a pair of cables 64. The tag 61 may be connected.

[0011]

The above-mentioned known building monitoring system has an advantage that a plurality of monitored parts having different monitoring types can be monitored at one place by using a common monitoring device. On the other hand, since the monitoring types of the plurality of monitored parts to be monitored are different, sensors of the types corresponding to the respective monitoring types, such as an infrared sensor, a temperature sensor, a smoke sensor, a glass breakage sensor, etc. Not only do they need to be used, but the detection thresholds that indicate normal and abnormal values obtained with different types of sensors are different. Therefore, on the common monitoring device side, detection circuits having different detection threshold values for each type of sensor are arranged in parallel, and the detection circuits are selectively selected based on the detection results of the respective sensors. Need to work.

As described above, the known building monitoring system has a problem that the configuration of a common monitoring device must be complicated, and as a result, the manufacturing cost of the entire building monitoring system increases. ing.

The present invention has been made to solve the above-mentioned problem, and has as its object to provide a monitoring method which can be realized by simply arranging a common detection circuit on the monitoring side irrespective of the type of a plurality of sensors used. It is to provide a system.

[0014]

In order to achieve the above object, a surveillance system according to the present invention utilizes the operation principle of the disclosed theft surveillance device, and a plurality of surveillance systems having different surveillance types are provided. Tag sensors that detect different physical phenomena corresponding to the monitoring types are arranged in the monitored part, and when the detection results of these tag sensors are detected as resistance values, the detection results are commonly monitored on the monitoring side. Means for selecting and configuring the normal range of the resistance value of the tag sensor to substantially match regardless of the type of the tag sensor.

According to such means, the normal range of the resistance value detected by each tag sensor is selected and configured to be substantially the same, so that the monitoring side sets different threshold values for each of the different types of tag sensors. There is no need to provide a detection unit having the same, and the detection results of the tag sensors of different types can be processed by the common detection unit.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In an embodiment of the present invention, a monitoring system is provided for each of a plurality of monitored units having different monitoring types and detects a state of the monitored unit based on a resistance value. Tag sensors, each of which is connected to the plurality of tag sensors, determines a resistance value detected by the plurality of tag sensors, and a plurality of resistance value determination units that output a determination signal indicating normal or abnormal, and the plurality of resistance value determination units And a monitoring unit main body for selectively receiving the judgment signals output by the control unit and displaying a normal or abnormal state of the received judgment signals, respectively, wherein the plurality of tag sensors are selected such that the normal ranges of the resistance values substantially coincide with each other. It is configured.

In the embodiment of the present invention, the plurality of resistance value determination units output a determination signal indicating abnormality when the resistance value detected by the plurality of tag sensors indicates a resistance change exceeding a required threshold value. It is.

As a preferred example of the embodiment of the present invention, the plurality of resistance value determination units convert the resistance value of the corresponding tag sensor into a voltage value, and the voltage value and the upper and lower resistance values of the resistance value. An upper limit reference voltage value and a lower limit reference voltage value representing respective values are compared, and a determination signal indicating normal or abnormal is output.

According to the embodiment of the present invention, a detection result of a tag sensor of a type corresponding to a physical phenomenon of a plurality of monitored parts having different monitoring types is detected as a resistance value,
Since each tag sensor is selected and configured so that the normal range of the resistance value detected by each tag sensor substantially matches, a detection circuit having a different threshold value is provided for each of the different types of tag sensors on the monitoring side. This eliminates the necessity and enables processing of detection results of different types of tag sensors using a common detection unit, so that a monitoring system with low manufacturing cost can be obtained.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing one embodiment of a monitoring system according to the present invention.

As shown in FIG. 1, the monitoring system of this embodiment comprises a monitoring unit main body 1 and a plurality of repeaters 2 connected in series via a transmission line 3. The monitoring unit body 1 includes a monitoring control unit 4 and an overall control unit 5,
Each of the repeaters 2 includes a plurality (N) of resistance value determination units 6 having the same configuration, and a tag sensor unit 7 connected to the connector 8 of each resistance value determination unit 6 via a pair of cables 9. I have.

In this case, the N tag sensor units 7 are arranged in a plurality of monitored units having different monitoring types and detect different physical phenomena in the respective monitored units.
For example, an infrared sensor for detecting the presence of an intruder or a fire, a smoke sensor for detecting a fire, a glass breakage sensor for detecting the presence of an intruder, and a thermistor for detecting a high temperature state such as a fire And a temperature sensor unit made of a bimetal, a door open sensor unit made of a reed switch for detecting the presence of an intruder, and the like.

FIGS. 2A to 2E are diagrams showing an example of the configuration of various sensor units in the tag sensor unit 7 of this embodiment. FIG. 2A is an infrared sensor unit, and FIG. (C) shows a glass break sensor, (d) shows a temperature sensor, and (e) shows a door open sensor.

Here, as shown in FIG. 2A, the infrared sensor unit 10 includes an infrared sensor 10a and an F sensor.
ET 10b, gate resistor 10c, and source semi-fixed resistor 10d, the output of which is connected to a plug 8a fitted into connector 8 through a pair of cables 9,
An infrared ray emitted from an infrared ray generator (not shown) arranged near the infrared ray sensor section 10 is transmitted to the infrared ray sensor 1.
0a. When the amount of infrared light received by the infrared sensor 10a is within a specified range, the resistance value between the source and the drain of the FET 10b is low, and the resistance value of the infrared sensor unit 10 side as viewed from the plug 8a is substantially fixed at the source. This shows a standard resistance state (resistance value in a normal range) equal to the resistance value of the resistor 10d. At this time, the infrared ray received by the infrared sensor 10a receives any object, for example,
When a part or most of the light is blocked by an intruder or a smoke filled by a fire, the source of the FET 10b is
The resistance value between the drains increases, and the resistance value on the infrared sensor unit 10 side as viewed from the plug 8a is substantially equal to the resistance value between the source and drain (a resistance value indicating an abnormal state).
become.

Next, as shown in FIG. 2B, the smoke sensor section 11 is composed of a light emitting diode 11a, a phototransistor 11b, and a resistor 11c, and the output is fitted into the connector 6 through a pair of cables 9. Plug 8a
The light emitting diode 11a and the phototransistor 11b are arranged to face each other via a monitoring space. And the phototransistor 11
b, the resistance value at both ends of the phototransistor 11b is relatively low, and the resistance value at the infrared sensor unit 10 side as viewed from the plug 8a is smaller than the resistance value at both ends of the phototransistor 11b. Standard resistance state equal to relatively low resistance value (normal range resistance value)
Is shown. At this time, if the light received by the phototransistor 11b is partially or largely cut off due to the filling of smoke due to the occurrence of a fire, the resistance value at both ends of the phototransistor 11b becomes relatively high, and the infrared sensor unit viewed from the plug 8a. The resistance value on the 10 side becomes a high resistance state (a resistance value indicating an abnormal state) indicating a relatively high resistance value at both ends of the phototransistor 11b.

Next, the glass breakage sensor section 12 is made of a conductive pattern 12a embedded in the window glass 12b at a substantially right angle along the periphery of the window, and outputs a plug fitted into the connector 6 through the pair of cables 9. 8a. When the window glass 12b is not damaged at all, the resistance value on the infrared sensor unit 10 side as viewed from the plug 8a is in a standard resistance state equal to a relatively low resistance value exhibited by the conductive pattern 12a (resistance value in a normal range). Is shown. At this time, the window glass 12
When b is broken, the conductive pattern 12a is also damaged and its resistance increases, and the resistance value on the infrared sensor unit 10 side viewed from the plug 8a indicates a high resistance state indicating a high resistance value due to the damaged conductive pattern 12a. (Resistance value indicating an abnormal state). In the glass breakage sensor section 12,
Conductive pattern 12 embedded inside window glass 12b
a may be arranged so as to be substantially square or substantially rectangular in addition to being arranged at a substantially right angle.

Subsequently, the temperature sensor section 13 includes the thermistor 1
The output is connected to a plug 8a fitted into the connector 6 through a pair of cables 9. And there is no outbreak of fire,
When the ambient temperature is at room temperature, the resistance of the infrared sensor unit 10 viewed from the plug 8a is thermistor resistance 13c.
Or, it shows a standard resistance state (resistance value in a normal range) due to a low resistance value exhibited by the internal resistance 13d. At this time,
When the ambient temperature rises due to a fire or the like, the resistance value of the thermistor resistor 13c increases (decreases) greatly, or the internal resistance 13d comes off due to the operation of the bimetal 13b, and the infrared ray viewed from the plug 8a. The resistance value on the sensor unit 10 side becomes a high resistance state (resistance value indicating an abnormal state) indicating a large resistance value or a low resistance state (resistance value indicating an abnormal state) indicating a rapidly reduced resistance value.

The door opening sensor 14 comprises a reed switch 14a and an internal resistor 14b. The output is connected to a plug 8a fitted into the connector 6 through a pair of cables 9, and the door opening sensor is provided. The magnet 14c is mounted on the upper part of the door 14d close to the position of the 14. When the door 14d is not opened, the reed switch 14a is closed by the proximity of the magnet 14c, and the resistance value of the infrared sensor unit 10 side viewed from the plug 8a is a standard resistance due to the low resistance value exhibited by the internal resistance 14b. The state (resistance value in a normal range) is shown. At this time, the door 14 is
When d is opened, the magnet 14c moves away to open the reed switch 14a, and the resistance value on the infrared sensor unit 10 side as viewed from the plug 8a becomes a high resistance state (resistance value indicating an abnormal state) indicating a large resistance value. Become.

As described above, the infrared sensor unit 10, the smoke sensor unit 11, the glass breakage sensor unit 12,
Both the temperature sensor unit 13 and the door opening sensor unit 14
The detection of a normal state and an abnormal state of a monitoring target in the monitored unit is detected as a resistance value. In a normal state, each detection output indicates a standard resistance state (a resistance value in a normal range), and the standard resistance state Each of the infrared sensor unit 10, the smoke sensor unit 11, the glass breakage sensor unit 12, the temperature sensor unit 13, and the door open sensor unit 14 is selectively configured so that (resistance values in the normal range) substantially match. .

FIG. 3 is a circuit diagram showing an example of the configuration of the resistance value judging section 6 used in the embodiment shown in FIG.

In FIG. 3, the same components as those shown in FIG. 1 are denoted by the same reference numerals.

As shown in FIG. 3, the resistance value judging unit 6
Are current sources 15, coupling capacitors 16, first voltage dividing resistors 17a, 17b, and second voltage dividing resistors 18a, 18b, 1
8c, a first voltage comparator 19a, and a second voltage comparator 19a.
b and an OR circuit 20.

The operation of the resistance value judging section 6 having the above configuration is as follows.
It is as follows.

The first voltage dividing resistors 17a, 17b generate a predetermined bias voltage Vb, and the second voltage dividing resistors 18a, 18b,
18c generates an upper threshold voltage _VH and a lower threshold voltage _VL . The first voltage comparator 19a has a non-inverting input (+) to the bias voltage Vb, the inverting input (-) to the added high threshold voltage V _H, respectively, the second voltage comparator 19b has an inverting input (-)
, A lower limit threshold voltage _VL is applied to the non-inverting input (+).

When the internal resistance value of the tag sensor unit 7 is in the standard resistance state (resistance value in a normal range), the current source 15
When the current flows through the internal resistance value of the tag sensor unit 7, the voltage drop of the internal resistance value is substantially equal to the predetermined bias voltage Vb, and the voltage applied to the non-inverting input (+) of the first voltage comparator 19a is the upper limit threshold. Hold voltage V _H does not exceed, and the inverted input (−) of the second voltage comparator 19b
, Does not reach the lower threshold voltage V _L , the output of the first voltage comparator 19a and the output of the second voltage comparator 19b both become low level (L), and the output of the OR circuit 20 also becomes low. It is at the low level (L), indicating that the state of the monitoring target of the corresponding monitored unit is normal.

Here, if the internal resistance of the tag sensor section 7 is set to a high resistance state or a low resistance state (resistance value indicating an abnormal state), the current of the current source 15 flows through the internal resistance value of the tag sensor section 7. In addition, the voltage drop of the internal resistance value greatly exceeds the predetermined bias voltage Vb or becomes significantly smaller than the predetermined bias voltage Vb, and the voltage applied to the non-inverting input (+) of the first voltage comparator 19a has an upper limit. the threshold voltage or greater than V _H, or, inverting input of the second voltage comparator 19b (-) since the voltage applied is reduced below the lower threshold voltage V _L, the output or first of the first voltage comparator 19a The output of the two-voltage comparator 19b changes from low level (L) to high level (H), and the output of the OR circuit 20 also changes from low level (L) to high level (H). To indicate that the state of the monitoring target of the corresponding monitored unit is an abnormal state.

FIG. 4 is a block diagram showing an example of a specific configuration of the repeater 2 used in the embodiment shown in FIG.

In FIG. 4, the same components as those shown in FIGS. 1 and 3 are denoted by the same reference numerals.

As shown in FIG. 4, the repeater 2 includes a transmission line 3 composed of a control line 3a and a data line 3b, a plurality (N) of resistance value judging units 6 to which tag sensors 7 are connected, respectively. It comprises a changeover switch 21, a repeater address control determination section 22, a repeater address determination section 23, a tag sensor section address control determination section 24, a tag sensor section address determination section 25, and a tag sensor section state transmission section 26. These components 3a, 3b, 21 to 26 are connected as shown in FIG.

The repeater 2 having the above configuration operates as follows.

The repeater address control judging unit 22 is connected to the control line 3a, and monitors whether or not a repeater address signal is transmitted from the monitoring unit 1 via the control line 3a. When the transmission of the address signal is detected, a transmission detection signal is output to the repeater address determination unit 23. The repeater address determination unit 23 is connected to the data line 3b, and takes in the repeater address signal from the data line 3b in response to the supplied transmission detection signal.
If it is intended for the self-repeater 2, a control signal is output to the tag sensor unit address control determining unit 24.
The tag sensor unit address control determination unit 24 is connected to the control line 3a, and when a control signal is supplied, monitors whether a tag address transmission signal is transmitted from the monitoring unit main body 1 through the control line 3a. When the transmission of the tag address transmission signal is detected, a transmission detection signal is output to the tag sensor unit address determination unit 25. The tag sensor unit address determination unit 25 is connected to the data line 3b and the changeover switch 21. The tag sensor unit address determination unit 25 takes in the tag sensor unit address from the data line 3b in response to the transmission detection signal, and sends the tag sensor unit address to the changeover switch 21. At the same time, it outputs an acquisition signal to the tag sensor unit status sending unit 26. The changeover switch 21 switches the movable contact to one addressed fixed contact by supplying the tag sensor section address, and outputs data from the resistance value judging section 6 connected to the fixed contact, that is, the tag sensor section. The low-level (L) or high-level (H) binary data of the state of the monitoring target based on the resistance value of 7 is output to the tag sensor state transmitting section 26. The tag sensor unit status sending unit 26 is connected to the control line 3a and the data line 3b. When an acquisition signal is supplied and binary data is supplied, the binary data is output to the data line 3b. I do.

When the first operation cycle based on such a series of operations is completed, a second operation cycle is started. The second operation cycle follows exactly the same operation as the first operation cycle, except that the movable contact of the changeover switch 21 is switched to a fixed contact different from the first operation cycle. When the second operation cycle is completed, a third operation cycle is started. In the same manner, a number of operation cycles corresponding to the number of the resistance value judgment sections 6 connected to the changeover switch 21 are sequentially executed. You.

FIG. 5 is a block diagram showing an example of a specific configuration of the monitoring section main body 1 used in the embodiment shown in FIG.

In FIG. 4, the same components as those shown in FIGS. 1 and 4 are denoted by the same reference numerals.

As shown in FIG. 5, the monitoring unit main body 1
It comprises a monitoring control unit 4 and an overall control unit 5. In this case, the monitoring control unit 4 includes a control line input / output unit 27, a data line input / output unit 28, a first switch 29, and a second switch 3
0, a repeater address generation unit 31, a tag sensor unit address generation unit 32, a tag sensor unit status inspection unit 33, and a display unit 34. The overall control unit 5 includes a control unit (CPU) 35, An instruction unit 36 is provided. These components 27 to 36 are connected as shown in FIG.

The monitoring section main body 1 having the above-mentioned configuration operates roughly as follows.

Now, when an instruction to set the monitoring mode is issued from the instruction unit 36, the monitoring unit 1 enters the monitoring mode through the control unit 35. In this monitoring mode, the control unit 35
Outputs a control signal to the repeater address generator 31 to activate the repeater address generator 31. The repeater address generator 31 supplies the first switch 29
To switch the movable contact of the first switch 29 to the first fixed contact (the fixed contact connected to the repeater address generator 31). Thereafter, the repeater address generator 31
Generates the first repeater address signal, and transfers the first repeater address signal to the first switch 29 and the control line input / output unit 27.
, And to the data line 3b via the first switch 29 and the data line 3b. When the transmission of the first repeater address signal ends, the repeater address generator 31 controls the first switch 29 again by supplying the control signal, and the first switch 29
Is connected to the second fixed contact (the fixed contact connected to the second switch 30), and a control signal is output to the tag sensor unit address generation unit 32. The tag sensor unit address generation unit 32 controls the second switch 30 by supplying a control signal, and switches the movable contact of the second switch 30 to the first fixed contact (the fixed contact connected to the tag sensor unit address generation unit 32). Connecting. Thereafter, the tag sensor unit address generation unit 32 generates a tag sensor unit address transmission signal and a tag sensor unit address. The tag sensor unit address transmission signal is transmitted to the control line 3a via the second switch 30, the first switch 29, and the control line input / output unit 27,
The address of the tag sensor unit is transmitted to the data line 3 via the second switch 30, the first switch 29, and the data line input / output unit 28.
b. When the transmission of the tag sensor section address transmission signal and the tag sensor section address is completed, the tag sensor section address generation section 32 controls the second switch 30 again by supplying the control signal, and changes the movable contact of the second switch 30 to the second fixed contact ( It is switched and connected to the fixed contact connected to the tag sensor unit status inspection unit 33).

At this time, the tag sensor unit status inspection unit 33
Inspects the binary data supplied from the control line 3a via the control line input / output unit 27, the first switch 29, and the second switch 30, and determines whether the data is low level (normal) or high level (abnormal). Judge another. Then, the tag sensor unit state inspection unit 33 displays the determination result on the display unit 34, generates an inspection end signal, and outputs the signal to the tag sensor unit address generation unit 32. Tag sensor part address generation part 3
2 controls the second switch 30 again by supplying the inspection end signal, and switches and connects the movable contact of the second switch 30 to the first fixed contact. Thereafter, the tag sensor unit address generation unit 32 generates a tag address transmission signal and a tag address. As in the previous case, the tag sensor unit address transmission signal is transmitted to the second switch 30, the first switch 29, and the control line input / output. The tag sensor unit address is sent to the control line 3a via the unit 27, and the tag sensor unit address is sent to the data line 3b via the second switch 30, the first switch 29, and the data line input / output unit 28. When the transmission of the tag sensor section address transmission signal and the tag sensor section address is completed, the tag sensor section address generation section 32 controls the second switch 30 again by supplying the control signal, and fixes the movable contact of the second switch 30 to the second fixed state. The connection is switched to the contact side, and the binary data inspection is performed in the tag sensor unit state inspection unit 33. Hereinafter, similarly, the above-described operation is repeatedly executed, and the tag sensor unit address generation unit 32 transmits the last tag sensor unit address transmission signal and the tag sensor unit address.
An end signal indicating the end of signal transmission is sent to the repeater address generator 3
1 is output. At this point, monitoring of the monitored unit using all the tag sensor units 7 connected to one relay device 2 ends.

Upon receipt of the end signal, the repeater address generator 31 shifts to monitoring of the monitored part using the tag sensor unit 7 connected to the next repeater 2, and the same operation as described above is repeated. Be executed. This operation is repeatedly performed by the number (N) of the repeaters 2. When the above operations for all the repeaters 2 are completed, the repeater address generator 31 outputs a monitoring end signal to the controller 35. Then, the monitoring unit main body 1 shifts from the monitoring mode to the standby mode.

When the monitoring unit 1 is in the standby mode,
When an instruction to set the monitoring mode is issued from the instruction unit 36, the monitoring unit main body 1 shifts from the standby mode to the monitoring mode, and the above-described series of operations is executed again.

As described above, according to the present embodiment, the states of the plurality of monitored parts are detected as the resistance values by the tag sensor units 7 disposed corresponding to the respective monitored parts, and the normal state of the resistance values is detected. Since the tag sensor units 7 are selected and configured so that the ranges substantially coincide with each other, it is not necessary to provide a detection unit having a different threshold value for each of the different tag sensor units 7 on the monitoring side. As a result, it is possible to process the detection results of the tag sensor units 7 of different types, so that an inexpensive monitoring system can be obtained.

[0053]

As described above, according to the present invention, tag sensors of a type corresponding to the physical phenomenon are arranged in a plurality of monitored units having different monitoring types, and the detection results of these tag sensors are determined. Each tag sensor is selected and configured so that the normal range of the resistance value indicated by each tag sensor is substantially the same as the resistance value, so that the monitoring side has different thresholds for each of the different types of tag sensors. There is no need to provide a detection unit having a value, and the common detection unit can process the detection results of the different types of tag sensors, so that a monitoring system with a low manufacturing cost can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a monitoring system according to the present invention.

FIG. 2 is a configuration diagram illustrating an example of a configuration of various sensor units in the tag sensor unit according to the embodiment illustrated in FIG. 1;

FIG. 3 is a circuit diagram showing an example of a configuration of a resistance value determination unit used in the embodiment shown in FIG.

FIG. 4 is a block diagram showing an example of a configuration of a repeater used in the embodiment shown in FIG.

FIG. 5 is a block diagram showing an example of a specific configuration of a monitoring unit main body used in the embodiment shown in FIG.

FIG. 6 is a block diagram showing a schematic configuration of a known theft alarm device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Monitoring part main body 2 Repeater 3 Transmission line 3a Control line 3b Data line 4 Monitoring control part 5 Overall control part 6 Resistance value judgment part 7 Tag sensor part 8 Connector 9 Cable 10 Infrared sensor part 11 Smoke sensor part 12 Glass break sensor part 13 Temperature sensor unit 14 Door open sensor unit 15 Current source 16 Coupling capacitor 19a First voltage comparator 19b Second voltage comparator 20 OR circuit 21 Changeover switch 22 Repeater address control determination unit 23 Repeater address determination unit 24 Tag sensor unit address control Judgment unit 25 Tag sensor unit address judgment 26 Tag sensor unit status sending unit 27 Control line input / output unit 28 Data line input / output unit 29 First switch 30 Second switch 31 Repeater address generation unit 32 Tag sensor unit address generation unit 33 Tag sensor unit state inspection Unit 34 Display unit 35 Control unit CPU) 36 instruction unit

Claims (3)

[Claims] 1. A plurality of tag sensors which are respectively arranged in a plurality of monitored units having different monitoring types and detect a state of the monitored unit based on a resistance value, and which are respectively connected to the plurality of tag sensors. A plurality of resistance value determination units that determine the resistance value detected by the tag sensor and output a determination signal indicating normal or abnormal, and selectively receive the determination signals output by the plurality of resistance value determination units sequentially and receive A monitoring unit main body for respectively displaying the normal or abnormal state of the judgment signal, wherein the plurality of tag sensors are selected and configured so that the normal ranges of the resistance values substantially coincide with each other. 2. The method according to claim 1, wherein the plurality of resistance value determination units output a determination signal indicating an abnormality when a resistance value detected by the plurality of tag sensors indicates a resistance change exceeding a required threshold value. The monitoring system according to claim 1. 3. The plurality of resistance value determination units convert a resistance value of a corresponding tag sensor into a voltage value, and an upper reference voltage value and an upper reference voltage value respectively representing an upper resistance value and a lower resistance value of the voltage value and the resistance value. 2. The monitoring system according to claim 1, wherein the monitoring system compares the lower limit reference voltage value and outputs a determination signal indicating normal or abnormal based on the comparison result.