KR20210087832A - Method and apparatus for monitoring fire using status of communication port - Google Patents

Abstract

The present invention relates to a device for monitoring fire installed in a vulnerable environment, such as an underground communication port or the like. The device includes: a control cable installed to monitor fire in a target area; a plurality of bimetal switches connected to at least one wire constituting the control cable; and a voltage measurement relay disposed between the control cable and communication equipment, measuring a voltage of the control cable, and outputting a predetermined relay signal based on the measured voltage.

Description

Fire monitoring method and device using communication port status {METHOD AND APPARATUS FOR MONITORING FIRE USING STATUS OF COMMUNICATION PORT}

The present invention relates to a fire monitoring method and an apparatus therefor, and more particularly, to a fire monitoring method and apparatus capable of effectively improving a fire monitoring false alarm generated in a vulnerable environment.

In general, the fire monitoring method in a place where the monitoring distance is long and the environment is weak (e.g., an underground communication area) consists of a linear detection line and a fire receiving panel, and a specific voltage (DC 24V) from the fire receiving panel to a linear sensing line installed in the place is applied and a resistor is installed at the end of the corresponding sensing line to monitor that a predetermined voltage (eg, 24V) is normally maintained, thereby determining whether a fire has occurred in real time. In the event of a fire in such a vulnerable environment, if the linear sensing line exceeds a predetermined temperature (for example, 70 degrees or 90 degrees) due to the heat caused by the fire, a short circuit or disconnection occurs in the corresponding detection line, and accordingly the voltage rises. When the fire reception panel detects a sudden change, a fire alarm is generated.

However, the linear sensing wire used in the conventional fire monitoring method has a fixed detection temperature of 70 degrees or 90 degrees, is separated by shielding with a thin piano string material, and is configured in a form in which a resistance runs at the end. Therefore, the linear sensing line installed in a vulnerable environment frequently generates a slight tangent line due to high humidity, which frequently causes false alarms in fire monitoring, which often delays or ignores the response of the fire department in case of an actual fire. In addition, since the linear sensing line is quite expensive, such as several tens to several million won per km, there is a problem in that maintenance and new replacement costs due to maintenance of defective sections occur considerably.

SUMMARY OF THE INVENTION The present invention aims to solve the above and other problems. Another object of the present invention is to provide a fire monitoring method and apparatus capable of effectively improving a fire monitoring false alarm generated in a vulnerable environment using DC no-load voltage characteristics and bimetal characteristics.

According to an aspect of the present invention to achieve the above or other objects, a control cable installed to monitor the fire in the control target area; a plurality of bimetal switches connected to at least one wire constituting the control cable; It is disposed between the control cable and the communication equipment, and measures the voltage of the control cable, and provides a fire monitoring device including a voltage measuring relay for outputting a predetermined relay signal based on the measured voltage.

More preferably, the fire monitoring device may further include a voltage supply for applying a predetermined DC voltage to the control cable. In addition, the fire monitoring device, upon receiving a predetermined relay signal, generates a syslog (syslog) message including the port information with a changed default state, and further comprises a communication device for transmitting the syslog message to the control server can

More preferably, the control cable is a LAN cable. In addition, the first and second wires located at one end of the control cable are connected to the voltage supply, and the third and fourth wires are connected to the voltage measuring relay, and the first and second wires located at the other end of the control cable are connected to the second end of the control cable. The first wire is connected to the third wire, and the second wire is connected to the fourth wire.

More preferably, each bimetal switch is characterized in that it is connected in parallel between two wires of the plurality of wires constituting the control cable. In addition, each bimetal switch is characterized in that it is connected in series on any one of the plurality of wires constituting the control cable. In addition, the plurality of bimetal switches are characterized in that they are arranged at regular intervals on at least one wire constituting the control cable.

More preferably, the communication equipment is characterized in that it is an L2 switch. In addition, the voltage measurement relay, when the measured voltage of the control cable reaches a predetermined threshold voltage, it is characterized in that the output of the predetermined relay signal to the communication equipment.

A method for monitoring a fire according to embodiments of the present invention and an effect of the device will be described as follows.

According to at least one of the embodiments of the present invention, it is possible to minimize false alarms for fire monitoring that frequently occur in places with a long monitoring distance and high humidity, such as an underground communication port, in conjunction with an existing fire monitoring device and its system. There is this.

In addition, according to at least one of the embodiments of the present invention, it is possible to monitor a long distance such as an underground communication port by a fire monitoring method using DC no-load voltage characteristics, and in particular, a fire monitoring system can be implemented at a low cost by using general-purpose parts with high stability. It has the advantage of being able to build and maintain it.

However, the effects that can be achieved by the fire monitoring method and the device according to the embodiments of the present invention are not limited to those mentioned above, and other effects not mentioned are in the technical field to which the present invention belongs from the description below. It will be clearly understood by those of ordinary skill in the art.

1 is a diagram schematically showing the configuration of a control system related to the present invention;
2 is a block diagram showing a hardware configuration of a communication equipment related to the present invention;
3 is a block diagram showing a hardware configuration of a control server related to the present invention;
4 is a view showing a LAN cable for explaining a loop phenomenon of a communication port related to the present invention;
5 is a view showing the configuration of a fire monitoring system using the control system of FIG. 1;
6 is a view showing the configuration of a fire monitoring device according to an embodiment of the present invention;
7 is a view showing a connection structure of a LAN cable constituting the fire monitoring device of FIG. 6;
8 and 9 are diagrams illustrating a connection structure between a LAN cable and a bimetal switch constituting the fire monitoring device of FIG. 6;

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numerals regardless of reference numerals, and overlapping descriptions thereof will be omitted. The suffixes "module" and "part" for the components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have a meaning or role distinct from each other by themselves. That is, the term 'unit' used in the present invention means a hardware component such as software, FPGA, or ASIC, and 'unit' performs certain roles. However, 'part' is not limited to software or hardware. The 'unit' may be configured to reside on an addressable storage medium or may be configured to refresh one or more processors. Thus, as an example, 'part' refers to components such as software components, object-oriented software components, class components and task components, processes, functions, properties, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays and variables. Functions provided within components and 'units' may be combined into a smaller number of components and 'units' or further divided into additional components and 'units'.

In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

The present invention proposes a fire monitoring method and apparatus capable of effectively improving a fire monitoring false alarm generated in an environment vulnerable by using DC no-load voltage characteristics and bimetal characteristics.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the drawings.

1 is a diagram schematically showing the configuration of a control system related to the present invention.

1, the control system 10 related to the present invention is a control cable 100 and communication equipment 200, a communication network 300, a control server 400 and a control terminal installed in a plurality of control target areas ( 500) are included.

A plurality of control areas to which the present invention is applicable include apartments, buildings, factories, communication offices, communication districts (Cable Turmel, CT), communication boxes (Broad Band Box, BBX) and energy storage systems (Energy Storage System, ESS) and the like, but are not necessarily limited thereto.

The control cable 100 is connected between the communication equipment 200 installed in each control target area and one or more control target points. A local area network (LAN) cable may be mainly used as the control cable 100 , but is not limited thereto.

The LAN cable 100, as shown in FIG. 4, is used for a LAN communication method using a standard Ethernet protocol, and is composed of a total of 4 pairs (8 strands). Here, wires 1 and 2 of the corresponding cable 100 may be used for transmission, and wires 3 and 6 may be used for reception. And, in a port where wires 1 and 3 are connected and wires 2 and 6 are connected, a loop phenomenon occurs in which a packet starts at the port and ends at the port again. It is possible to monitor the environment of the control target area by using the loop phenomenon of the communication port.

Each communication device 200 is connected to the control target point through the control cable (100). In this case, the L2 switch may be used as the communication device 200 . The L2 switch is an example of communication equipment to which an embodiment of the present invention is applied. Hereinafter, the L2 switch is described as an L2 switch for convenience of description, but the communication equipment 200 is not limited to the L2 switch. It is a concept that includes all communication equipment that can implement the example.

The L2 switch 200 is a switch operating in layer 2, and performs an operation of switching based on a MAC (Media Access Control) address of the packet, that is, switching to which port the packet is to be sent. Ports of the L2 switch 200 have respective MAC addresses. At least one port provided in the L2 switch 200 is connected to an independent control target point through an individual control cable 100 .

When the port state is changed, the L2 switch 200 transmits a syslog message including information on the port whose default state is changed to the control server 400 connected through the communication network 300 . At this time, the L2 switch 200 saves the port state change as its log file and at the same time generates a syslog message and transmits it to the control server 400 in a UDP unicast (User Datagram Protocol Unicast) method. do.

The control server 400 monitors the environment of the control target area based on the state change of each port included in the L2 switch 200 . Here, the control includes door opening/closing monitoring, flood monitoring, fire monitoring, and the like.

The control server 400 may perform a control function using a loop phenomenon of the L2 switch port or may perform a control function based on whether the L2 switch port is activated.

According to an embodiment, when the L2 switch 200 has a loop detection function, the default state of each port is set to a loop-on or loop-off state. The L2 switch 200 generates a syslog message and transmits the syslog message to the control server 400 when the default state is changed, that is, from loop on to loop off or from loop off to loop on. The control server 400 recognizes a change in a control target or control area matching a corresponding port based on a syslog message received from the L2 switch 200 .

Meanwhile, according to another embodiment, when the L2 switch 200 does not have a loop detection function, the default state of each port may be set to a port up (up) or a port down (down). In a state in which the control cable 100 connected to the port is connected, current or electricity is detected from the corresponding port, so the L2 switch 200 recognizes the corresponding port as the up state. However, when the tangent line of the control cable 100 connected to the port is released, it is the same as when the connection between the port and the control cable 100 is finally released, so no current or electricity is detected in the port. Accordingly, the L2 switch 200 recognizes the corresponding port as a down state. The L2 switch 200 generates a syslog message in which a log indicating port up or port down is recorded when the default state is changed, that is, changed from port up to port down or from port down to port up. and transmits it to the control server 400 . Then, the control server 400 recognizes a change in the control target or control area matching the port based on the syslog message received from the L2 switch 200 .

When a syslog message is received, the control server 400 transmits an alarm signal to a pre-designated control terminal 500 . Here, the syslog message includes the HostIP field indicating the IP address of the system sending the log, the HostName field indicating the name of the system sending the log, the SeverityLevel field indicating the log importance, the SyslogMessage field indicating the log contents, It may include a ProcessID field indicating the ID of the process that generated the log, an EventTime field indicating the date and time the event was generated, and the like.

The control server 400 identifies a control target area based on HostIP field information of a syslog message, and selects a specific control target point within the control target area based on a port number or MAC address included in SyslogMessage field information. can be identified.

The control server 400 may transmit an alarm signal or an alarm cancellation signal to the control terminal 500 designated in advance based on contact information matched to the control target area and the control target point. Here, a message service of a mobile communication service provider such as an SMS (Short Message Service) may be used as the alarm signal or the alarm cancellation signal. In addition, the control server 400 may display an alarm occurrence point on the control screen so that the operator can check it.

The control terminal 500 may output an alarm signal or an alarm cancellation signal received from the control server 400 to a system operator, a security guard, or a public official. In this case, the alarm signal or the alarm cancellation signal may be output in the form of at least one of a visual signal, an audio signal, and a tactile signal.

The control terminal described in this specification includes a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a slate PC, a tablet A tablet PC (PC), an ultrabook, and a wearable device may be included.

2 is a block diagram illustrating a hardware configuration of a communication device related to the present invention.

Referring to FIG. 2 , the communication equipment 200 related to the present invention is an L2 switch, and includes a plurality of control ports 201 , a plurality of communication ports 203 , a memory 205 , and a processor 207 .

The control port 201 is a port designated to be connected to the control cable 100 among a plurality of communication ports provided in the L2 switch 200 , and the communication port 203 is a plurality of communication ports provided in the L2 switch 200 . Among the communication ports, except for the plurality of control ports 201 . Here, the control port 201 may be a wired port, and the communication port 203 may be a wired port or a wireless port.

The memory 205 is connected to the processor 207 and generates a syslog message according to whether or not the port state of the control port 201 is changed and transmits the generated syslog message to the control server 400. Commands defining a series of operations Saves a program composed of (Instructions). The program implements the present invention in combination with hardware such as a memory 205 and a processor 207 .

The processor (or control unit) 207 executes a program stored in the memory 205 . The processor 207 blocks at least one control port 201 in a default state. Here, the block means logically set not to communicate. The default state of the control port 201 is a loop-on or loop-off state, and the default state of each control port 201 may be different from each other.

When the default state is changed among the block-processed at least one control port 201, for example, when the processor 207 becomes a loop-off state from a loop-on state, a loop detect link down (Loop detect link down) Generates a syslog message indicating unblock processing by In addition, when the processor 207 returns from the loop-off state to the loop-on state, the processor 207 generates a syslog message indicating block processing by loop detect link up.

The processor 207 may perform logical separation of networks by allocating a virtual LAN (VLAN) identifier based on a MAC or port number. In this case, different VLAN identifiers may be allocated to the at least one control port 201 and the at least one communication port 203 , and different VLAN identifiers may be allocated to each control port 201 . The reason for allocating the VLAN identifier differently in this way is to prevent a communication failure of the L2 switch 200 itself due to the loop state of the control port 201 .

3 is a block diagram showing the hardware configuration of the control server related to the present invention.

Referring to FIG. 3 , the control server 400 related to the present invention includes a communication unit 401 , an input unit 403 , an output unit 405 , a storage unit 407 , and a processor 409 .

The communication unit 401 is connected to the processor 409 to transmit and receive data. The communication unit 401 receives a syslog message from the L2 switch 200 through the communication network 300 . The communication unit 401 transmits the alarm signal or the alarm cancellation signal generated by the processor 407 to the control terminal 500 through the communication network 300 . In this case, the communication unit 401 may transmit an alarm signal or an alarm cancellation signal to the control terminal 500 through a message service center (not shown) such as a Short Message Service Center (SMSC).

The input unit 403 may include a user input unit (eg, a touch key, a mechanical key, etc.) for receiving control information from a system operator. The data collected by the input unit 403 may be analyzed and processed as a user's control command.

The output unit 405 displays (outputs) information processed by the control server 400 . For example, the output unit 405 may display execution screen information of an application program driven by the control server 400 or UI (User Interface) and GUI (Graphic User Interface) information according to the execution screen information. .

The storage unit 407 is connected to the processor 409 and stores a program including instructions for executing the operation of the control server 400 . The program implements the present invention in combination with hardware such as a storage unit 407 and a processor 409 .

The storage unit 407 stores information necessary for identifying a control target area and a control target point based on a syslog message received by the processor 409 from the L2 switch 200 . For example, the storage unit 407 may store table information as shown in Table 1 below.

L2 HostIP control position port number control type Contact 10.10.10.10 XX number 4 fire alarm 010-1234-5678 ... ... ... ... ...

The processor 409 analyzes a syslog message received from the L2 switch 200 to check HostIP field information. Then, the processor 409 checks the control location based on the checked HostIP field information. The processor 409 checks the port number based on SyslogMessage field information of a syslog message. Then, the processor 409 checks the control type and contact information based on the confirmed port number. If the port number is 4, since it is fire monitoring, the processor 407 generates a predetermined alarm signal P3 or an alarm cancellation signal P5, and transmits it to the control terminal 500 corresponding to the checked contact. Here, the MAC address may be used instead of the port number.

FIG. 5 is a diagram showing the configuration of a fire monitoring system using the control system of FIG. 1 .

Referring to FIG. 5 , the fire monitoring system 20 according to an embodiment of the present invention includes a first fire monitoring device 600 , a second fire monitoring device 700 , an L2 switch 200 , a communication network 300 , It includes a control server 400 and a control terminal 500 . Here, the L2 switch 200 , the communication network 300 , the control server 400 and the control terminal 500 are the L2 switch 200 , the communication network 300 , the control server 400 and the control terminal of FIG. 1 described above. Since it is the same as (500), a detailed description thereof will be omitted.

The first fire monitoring device 600 is installed in a control target area (eg, a communication area), and monitors a fire in the corresponding area using the linear detection line 610 and the fire receiving panel 620 . The first fire monitoring device 600 may be connected to any one of the control ports of the L2 switch 200 . However, the first fire monitoring device 600 may output a fire monitoring false alarm due to frequent shorting of the linear detection line 610 installed in a high-humidity environment such as an underground communication port. In order to improve the fire monitoring false alarm, it is necessary to separately install the second fire monitoring device 700 in the control target area.

The second fire monitoring device 700 is installed in the same control target area (eg, a communication area), and monitors a fire in the corresponding area using a LAN line and a plurality of bimetal switches. Similarly, the second fire monitoring device 700 may be connected to any one of the control ports of the L2 switch 200 .

The second fire monitoring device 700 may work in conjunction with the first fire monitoring device 600 to minimize a fire monitoring false alarm of the first fire monitoring device 600 . In addition, the second fire monitoring device 700 has a small voltage drop according to the distance due to the DC no-load voltage characteristic, is resistant to moisture, and can be easily constructed and maintained at low cost.

The L2 switch 200, as a switch operating in layer 2, determines which port to transmit the corresponding packet to based on the MAC address of the packet and switches the packet path. To this end, the L2 switch 200 has a first MAC address corresponding to the first fire monitoring device 600 and a second MAC address corresponding to the second fire monitoring device 700 .

When the port state is changed, the L2 switch 200 transmits a syslog message including information on the port whose default state is changed to the control server 400 connected through the communication network 300 .

The control server 400 monitors the fire in the control target area based on the state change of each port included in the L2 switch 200 . In addition, the control server 400 transmits an alarm signal to the control terminal 500 designated in advance when a fire is detected.

The overall operation of the fire monitoring system 20 configured as described above is as follows. When a fire occurs in the control target area, when the first fire monitoring device 600 outputs a predetermined fire detection signal to the L2 port connected to itself, the L2 switch 200 detects a change in the state of the corresponding port and detects a change in the syslog ( syslog) message to the control server 400 . By analyzing the syslog message received from the L2 switch 200 , the control server 400 may confirm that a fire in the control target area has been detected through the first fire monitoring device 600 .

Similarly, when a fire occurs in the same area, when the second fire monitoring device 700 outputs a predetermined fire detection signal to the L2 port connected thereto, the L2 switch 200 detects a change in the state of the corresponding port and syslog A (syslog) message is transmitted to the control server 400 . By analyzing the syslog message received from the L2 switch 200 , the control server 400 may confirm that a fire in the control target area has been detected through the second fire monitoring device 700 .

When a fire is detected through any one of the first and second fire monitoring devices 600 and 700, the control server 400 may transmit an alarm signal to a predetermined first control terminal (eg, an operator terminal, 520). have. On the other hand, when a fire is detected through both the first and second fire monitoring devices 600 and 700, the control server 400 performs not only the predetermined first control terminal 520 but also the predetermined second control terminal (eg, An alarm signal may be transmitted to the government office terminal (510).

On the other hand, in the present embodiment, it is exemplified that the fire detection function is performed by installing both the first and second fire monitoring devices in the control target area, but is not necessarily limited thereto. Accordingly, it will be apparent to those skilled in the art that the fire detection function can be performed by installing only the second fire monitoring device in the corresponding area instead of the first fire monitoring device. Hereinafter, the configuration and operation principle of the second fire monitoring device will be described in detail.

6 is a diagram showing the configuration of a fire monitoring device according to an embodiment of the present invention, FIG. 7 is a diagram showing a connection structure of a LAN cable constituting the fire monitoring device of FIG. 6, and FIGS. 8 and 9 are FIGS. 6 is a diagram showing the connection structure between the LAN cable and the bimetal switch constituting the fire monitoring device.

6 and 7 , the fire monitoring device 700 according to an embodiment of the present invention includes a control cable 710 , a voltage supply unit 720 , a plurality of bimetal switches 730 and a voltage measurement relay 740 . includes

The control cable 710 is installed in the control target area, and performs an operation of transmitting an electrical signal for fire detection. The control cable 710 is connected between the voltage supply unit 720 and the voltage measurement relay 740 . A LAN cable may be used as the control cable 710, but is not limited thereto. Hereinafter, in this embodiment, for convenience of description, a LAN cable composed of a total of 4 pairs (8 strands) of wires is used as an example.

One LAN cable 710 may be installed in the control target area. For example, as shown in FIG. 7 , the first and second wires 711 and 713 located at one end of the LAN cable 710 installed in the control target area may be configured to be connected to the voltage supply unit 720 . And, the third and fourth wires 715 and 717 may be configured to be connected to the voltage measurement relay 740 . In addition, the first wire 711 located at the other end of the corresponding cable 710 may be configured to be connected to the adjacent third wire 715 , and the second wire 713 may be connected to the adjacent fourth wire 717 and It can be configured to be connected. According to the cyclic connection structure of the LAN cable 710 , the voltage supply unit 720 has a structure electrically connected to the voltage measurement relay 740 through the LAN cable 710 . As such, two pairs of wires among the wires included in the LAN cable 710 may be used for fire monitoring.

The voltage supply unit 720 supplies a predetermined DC voltage to the LAN cable 710 . That is, the voltage supply unit 720 applies (+) DC power to the first wire 711 located at one end of the LAN cable 710 and applies (-) DC power to the second wire 713 . . The DC voltage that can be supplied to the LAN cable 710 may be in the range of 12V to 48V, but is not necessarily limited thereto.

The plurality of bimetal switches 730 sense the temperature of the control target area in real time and perform an operation of turning the switch on/off based on a predetermined temperature. To this end, the plurality of bimetal switches 730 may be installed on at least one wire constituting the LAN cable 710 at equal or non-uniform intervals.

Bimetal is a bar-shaped component element made by welding two types of thin metal plates with different coefficients of thermal expansion on top of each other, and measures the temperature by using the property of different degrees of bending when heat is applied. An alloy of nickel (Ni) and iron (Fe) can be used as a metal with a small coefficient of thermal expansion, and an alloy of nickel/manganese (Mn)/iron with a metal with a high coefficient of thermal expansion, 　 nickel/molybdenum (Mo)/ An alloy of iron, an alloy of nickel/manganese/copper (Cu), etc. may be used.

The plurality of bimetal switches 730 may be connected in parallel on at least one wire constituting the LAN cable 710 . For example, as shown in FIG. 8 , the bimetal switch 730 may be connected in parallel between a first wire and a second wire among a plurality of wires constituting the LAN cable 710 . In the case of such a parallel connection structure, the bimetal switch 730 is normally maintained in an open state, and in case of a fire, the bimetal switch 730 is switched from an open state to a closed state. Accordingly, a normal voltage (eg, 12V) is normally measured through the voltage measurement relay 740 , and a threshold voltage (eg, OV) is measured when a fire occurs. The voltage measuring relay 740 outputs a relay signal corresponding to the fire detection event to the L2 switch 200 when the threshold voltage is reached.

Meanwhile, in another embodiment, the plurality of bimetal switches 730 may be connected in series on at least one wire constituting the LAN cable 710 . For example, as shown in FIG. 9 , the bimetal switch 730 may be connected in series on any one of a plurality of wires constituting the LAN cable 710 . In the case of such a series connection structure, the bimetal switch 730 is normally maintained in a closed state, and when a fire occurs, the bimetal switch 730 is switched from a closed state to an open state. Accordingly, a normal voltage (eg, 12V) is normally measured through the voltage measuring relay 740 , and a threshold voltage (eg, OV) is measured when a fire occurs. The voltage measurement relay 740 outputs a relay signal corresponding to the fire detection event to the L2 switch 200 when the threshold voltage is reached.

The voltage measuring relay 740 is disposed between the L2 switch 200 and the LAN cable 710 , and has a function of measuring the voltage of the LAN cable 710 and outputs a predetermined relay signal to the L2 switch 200 . function can be performed. To this end, the voltage measuring relay 740 may include a voltage measuring unit (not shown) and a relay unit (not shown).

The voltage measuring relay 740 measures the DC voltage applied from the voltage supply unit 720 to the LAN cable 710 . The voltage drop in the LAN cable 710 hardly occurs due to the DC no-load voltage characteristic. Accordingly, in normal times, the voltage measuring relay 740 measures a DC voltage that is substantially the same as the DC voltage applied from the voltage supply unit 720 . On the other hand, when a fire occurs, the voltage measuring relay 740 measures 0V voltage or a DC voltage close thereto.

The voltage measurement relay 740 may output a relay signal (eg, an open/closed signal) to the L2 switch 200 when a predetermined threshold voltage is reached. When the state of the L2 port is changed by the relay signal, the L2 switch 200 may transmit a syslog message including information on the port whose default state is changed to the control server 400 . Upon receiving this, the control server 400 may transmit an alert signal to a pre-designated control terminal 500 .

On the other hand, even if the bimetal switch 730 does not operate, if the LAN cable 710 itself is damaged due to a fire, the voltage value gradually decreases to cause a final disconnection or short circuit, and accordingly, when a predetermined threshold voltage is reached, The voltage measurement relay 740 outputs a relay signal to the L2 switch 200 . Therefore, even if the bimetal switch 730 is installed at appropriate intervals according to the surrounding environment, normal fire monitoring is possible.

As described above, the fire monitoring device according to an embodiment of the present invention can minimize false alarms for fire monitoring that frequently occur in places with a long monitoring distance and high humidity, such as an underground communication port. In addition, the fire monitoring device can monitor a long distance such as an underground communication port in a no-load monitoring method using the basic characteristics of DC voltage, and in particular, it is possible to build and maintain a fire monitoring system at low cost.

The present invention described above can be implemented as computer-readable code on a medium in which a program is recorded. The computer-readable medium includes all kinds of recording devices in which data readable by a computer system is stored. Examples of computer-readable media include Hard Disk Drive (HDD), Solid State Disk (SSD), Silicon Disk Drive (SDD), ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc. There is this. Accordingly, the above detailed description should not be construed as restrictive in all respects but as exemplary. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention.

10: control system 20: fire monitoring system
100: control cable 200: L2 switch
300: communication network 400: control server
500: control terminal 600/700: fire monitoring device

Claims (10)

Control cables installed to monitor fires in the target area;
a plurality of bimetal switches connected to at least one wire constituting the control cable;
and a voltage measuring relay disposed between the control cable and the communication equipment, measuring the voltage of the control cable, and outputting a predetermined relay signal based on the measured voltage. According to claim 1,
Fire monitoring device further comprising a voltage supply for applying a predetermined DC voltage to the control cable. 3. The method of claim 2,
The first and second wires located at one end of the control cable are connected to the voltage supply, and the third and fourth wires are connected to the voltage measuring relay,
A first wire positioned at the other end of the control cable is connected to a third wire, and the second wire is connected to a fourth wire. According to claim 1,
The control cable is a fire monitoring device, characterized in that it is a LAN cable. According to claim 1,
Each bimetal switch is a fire monitoring device, characterized in that connected in parallel between two of the plurality of wires constituting the control cable. According to claim 1,
Each bimetal switch is a fire monitoring device, characterized in that connected in series on any one of the plurality of wires constituting the control cable. According to claim 1,
The plurality of bimetal switches are fire monitoring device, characterized in that arranged at regular intervals on at least one wire constituting the control cable. According to claim 1,
and a communication device for generating a syslog message including information on a port whose default state is changed when the predetermined relay signal is received, and transmitting the syslog message to a control server. 9. The method of claim 8,
The communication equipment is a fire monitoring device, characterized in that the L2 switch. 9. The method of claim 8,
The voltage measuring relay, when the measured voltage of the control cable reaches a predetermined threshold voltage, the fire monitoring device, characterized in that for outputting the predetermined relay signal to the communication equipment.

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