Fire alarm systems and terminals

Abstract

To provide a fire alarm system that automatically designates different addresses in plural terminals.SOLUTION: In a fire alarm system in which a controller is connected to plural terminals (relays connected to smoke detectors and smoke exhaust prevention terminals) over plural communication lines, the controller 1 includes an address transmission unit that sequentially transmits plural addresses. A first terminal 2A includes a first switching unit 22A that switches a condition of a first communication channel between the controller and a second terminal 2B from a limited connection condition, in which a connection is made through a low-band pass filter 223A, into a non-limited connection condition in which a connection is made with no intervention. The second terminal includes a control unit 24B including a second address receiving block that receives a second address over the first communication channel brought to the non-limited connection condition by the first switching unit, a second address memory unit 23B that stores the second address received by the second address receiving block, and a second switching unit 22B that switches the condition of the second communication channel between the first terminal and a subsequent terminal downstream the second terminal from the limited connection condition into the non-limited connection condition.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a fire alarm system, and a terminal and a control device used in the fire alarm system. [Background technology]

[0002] Conventionally, there is known a method for automatically setting an address to a terminal used in a fire alarm system. Patent Document 1 discloses a technique in which, when an address is set to a first terminal, the terminal to which the address is set generates addresses for other terminals and transmits the generated addresses to the other terminals. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2000-67352 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional technology, there was a problem that the address generated by the terminal may be the same as an address already being used by another terminal. Therefore, in address setting, an operator must manually set the address for each device, which is time-consuming and prone to setting errors.

[0005] The present invention has been made in consideration of these points, and has an object to make it possible to automatically set different addresses to a plurality of terminals. [Means for solving the problem]

[0006] A fire alarm system according to a first aspect of the present invention includes a first terminal and a second terminal connected in cascade, and a control device connected to the first terminal. The control device has an address generation unit that generates a plurality of different addresses, and an address transmission unit that sequentially transmits, from the plurality of addresses generated by the address generation unit, a first address to be set in the first terminal and a second address different from the first address to be set in the second terminal. The first terminal has a first address receiving unit that receives the first address transmitted by the address transmission unit, a first address storage unit that stores the first address received by the first address receiving unit, and a first address storage unit that stores the first address received by the first address receiving unit, and a first address storage unit that stores the first address received by the first address receiving unit, and a first address storage unit that stores the first address received by the first address receiving unit, and a control device and a second address storage unit that stores the first address received by the first address receiving unit, in response to the first address being received by the first address receiving unit. and a first switching unit that switches a state of a first communication path between the first terminal and the second terminal from a limited connection state in which the second address is not transmitted to a non-restrictive connection state in which the second address is transmitted, and the second terminal has a second address receiving unit that receives the second address transmitted by the address transmitting unit via the first communication path that the first switching unit has put into a non-restrictive connection state, a second address memory unit that stores the second address received by the second address receiving unit, and a second switching unit that switches a state of the second communication path between the first terminal and another terminal downstream of the second terminal from a limited connection state in which the address is not transmitted to the other terminal to a non-restrictive connection state in which the address is transmitted to the other terminal in response to the second address being received by the second address receiving unit.

[0007] The first switching unit may switch the state of the first communication path from the limited connection state in which the second address is not transmitted to the second terminal via the first communication path and power supplied from the control device is transmitted to the second terminal to the non-restrictive connection state in which the second address and the power are transmitted to the second terminal.

[0008] The first switching unit may include a low-pass filter that blocks a signal including the second address and passes a DC signal, the first communication path that passes a signal including the second address and a DC signal, and a switching element that connects the control device and the second terminal via the low-pass filter in the limited connection state and connects the control device and the second terminal via the first communication path in the non-restrictive connection state.

[0009] The first address receiving unit may store the first address received from the control device in the first address storage unit on condition that the address is not stored in the first address storage unit.

[0010] When the first address is stored in the first address storage unit, the first address receiving unit may transmit a response signal to the control device notifying the control device that the first address has been received.

[0011] After transmitting the first address, the address transmission unit may transmit the second address after a time longer than a time required from when the first terminal receives the first address until when the first switching unit switches the first communication path from the restrictive connection state to the non-restrictive connection state has elapsed.

[0012] The control device may further include a setting reception unit that receives a setting of the number of terminals to which the addresses are to be set, and the address transmission unit may sequentially transmit the number of addresses received by the setting reception unit.

[0013] A second aspect of the terminal of the present invention is a terminal used in a fire alarm system in a cascade connection between an upstream terminal and a downstream terminal, and has an address receiving unit that receives an address sent by a control device of the fire alarm system via the upstream terminal, an address memory unit that stores the address received by the address receiving unit, and a switching unit that, in response to the address being received by the address receiving unit, switches the communication path between the upstream terminal and the downstream terminal from a restricted connection state in which the address is not transmitted to a non-restrictive connection state in which the address is transmitted.

[0014] A control device of a third aspect of the present invention is a control device for a fire alarm system, the control device being cascaded and connected via a communication line to a terminal at the end of the cascade connection among a plurality of terminals that detect the occurrence of a fire, and having an address generation unit that generates a plurality of different addresses, and an address transmission unit that sequentially transmits the plurality of addresses generated by the address generation unit. Effect of the Invention

[0015] According to the present invention, it is possible to automatically set different addresses to a plurality of terminals. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a fire alarm system. [Diagram 2] FIG. 2 is a diagram illustrating a configuration of a control device. [Diagram 3] FIG. 2 is a diagram showing the configuration of a terminal. [Figure 4] FIG. 2 is a diagram showing an outline of the circuit configuration of a control device and a terminal. [Diagram 5] FIG. 2 is a sequence diagram showing a processing flow in the fire alarm system. [Figure 6] FIG. 2 is a diagram showing a signal flow in a fire alarm system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] [Fire Alarm System S Overview] 1 is a diagram showing an example of the configuration of a fire alarm system S. The fire alarm system S includes a control device 1 and multiple terminals 2. The control device 1 is included in a fire receiver and functions as a control panel. The control device 1 is connected to multiple communication lines L, and is connected to multiple terminals 2 via the communication lines L.

[0018] The control device 1 receives data transmitted by a plurality of terminals 2. For example, the control device 1 transmits a polling signal including an address for identifying each of the plurality of terminals 2, and receives data from the terminal 2 that has received the polling signal.

[0019] The control device 1 generates identification information (hereinafter, referred to as an address) to be set for each of the multiple terminals 2. The control device 1 transmits the addresses to be set for each of the multiple terminals 2 via the communication line L in sequence.

[0020] The multiple terminals 2 are condition detection terminals, such as smoke detectors 2-1 or heat detectors 2-2, for detecting abnormal conditions such as fire, smoke, or strange odors in the facility in which the fire alarm system S is installed. As shown in Fig. 1, the multiple terminals 2 may include a repeater 2-4 connected to a smoke exhaust terminal ER.

[0021] The multiple terminals 2 are connected in a cascade configuration. That is, each of the multiple terminals 2 is connected to another terminal 2 on the upstream side that is closer to the control device 1, and another terminal 2 on the downstream side that is farther from the control device 1. The terminals 2 receive data transmitted from the control device 1 via the other terminals 2 on the upstream side. However, terminals 2-1 and 2-5 are connected to the control device 1, and receive data directly from the control device 1.

[0022] Each of the multiple terminals 2 is assigned a unique address by receiving an address transmitted to each terminal from the control device 1. For example, a unique address 00 to FF is assigned to each of the multiple terminals 2. The address may be in hexadecimal, decimal, binary, or any other format.

[0023] The multiple terminals 2 store the received address. When the multiple terminals 2 receive a polling signal from the control device 1, they compare the address included in the polling signal with the stored address. If the address included in the polling signal matches the stored address, the multiple terminals 2 transmit a response signal including status data indicating the detected status to the control device 1. If the address included in the polling signal does not match the stored address, the multiple terminals 2 do not transmit a response signal including status data indicating the detected status to the control device 1.

[0024] In the fire alarm system S, the control device 1 automatically sets addresses to multiple terminals 2. If addresses have not been set to the multiple terminals 2, the control device 1 cannot designate a specific terminal 2 and transmit the address to be set. Therefore, the fire alarm system S is configured so that the terminal 2 most upstream among the multiple terminals 2 for which no address has been set receives the address transmitted by the control device 1 first.

[0025] The terminal 2 has a switching unit that switches the state of the internal communication path for transmitting data received from the upstream terminal 2 to the downstream terminal 2. A terminal 2 in which an address is not set is in a limited connection state in which the internal communication path does not transmit an address received from the control device 1 or the upstream terminal 2 to the downstream terminal 2. When the terminal 2 in the limited connection state receives an address transmitted by the control device 1, the switching unit switches the internal communication path to a non-restrictive connection state in which the address transmitted next by the control device 1 is transmitted to the downstream terminal 2.

[0026] By configuring the multiple terminals 2 in this way, the terminal 2 on the most upstream side among the multiple terminals 2 for which no address has been set receives the address transmitted from the control device 1 and sets it as its own address. As a result, even in a state in which the addresses of the multiple terminals 2 have not been set, the control device 1 can automatically set addresses to the multiple terminals 2. The configurations of the control device 1 and the terminal 2 will be described in detail below.

[0027] [Configuration of control device 1] 2 is a diagram showing the configuration of the control device 1. The control device 1 has a communication unit 11, a storage unit 12, and a control unit 13. The control unit 13 has an address generation unit 131, a data transmission unit 132, and a response reception unit 133.

[0028] The communication unit 11 has a communication interface for communicating with the terminal 2 via the communication line L. The communication unit 11 transmits an address setting command including the address generated by the address generation unit 131 to the terminal 2 via the communication line L. The communication unit 11 receives the address setting response transmitted by the terminal 2, and inputs the address setting response to the response receiving unit 133.

[0029] The communication unit 11 transmits to the terminal 2 a polling signal including the polling data input from the data transmission unit 132. The communication unit 11 receives a response signal including status data indicating a status detected by the terminal 2, which is transmitted by the terminal 2 in response to the polling signal. The communication unit 11 inputs the status data included in the response signal to the response reception unit 133.

[0030] The storage unit 12 has storage media such as a ROM (Read Only Memory), a RAM (Random Access Memory), and an SSD (Solid State Drive). The storage unit 12 stores programs executed by the control unit 13. The storage unit 12 also stores the address of a terminal 2 whose address has been set in association with status data received from the terminal 2. The storage unit 12 may store information (hereinafter referred to as terminal information) about a plurality of terminals 2 set by, for example, an administrator of the fire alarm system S. The terminal information includes information unique to the terminal 2 that is different from the address of the terminal 2, such as the type or model name of the terminal 2.

[0031] The control unit 13 has, for example, a CPU (Central Processing Unit) and executes various processes. The control unit 13 executes the programs stored in the storage unit 12, thereby functioning as an address generating unit 131, a data transmitting unit 132, a response receiving unit 133, and a setting accepting unit 134.

[0032] Address generation unit 131 generates a plurality of different addresses corresponding to a plurality of terminals 2. Address generation unit 131 inputs the generated addresses to data transmission unit 132. Address generation unit 131 may generate a plurality of addresses whose values ​​differ by a predetermined number (for example, 1), or may generate a plurality of addresses whose values ​​are random. Address generation unit 131 may receive a setting for the number of terminals from setting reception unit 134, which will be described later, and generate the set number of addresses.

[0033] The address generating unit 131 generates an address that does not overlap with the address of a terminal 2 whose address has already been set. For example, the address generating unit 131 reads out the address of a terminal 2 whose address has already been set from the storage unit 12, and generates an address different from the read address. By operating in this manner, the address generating unit 131 can prevent the address of a registered terminal 2 from overlapping with the address of the new terminal 2 even when a new terminal 2 is added after addresses have been set in multiple terminals 2.

[0034] The data transmission unit 132 transmits various types of data to the terminal 2 via the communication unit 11. The data transmission unit 132 transmits an address setting command including an address to a terminal 2 in which an address is not set, and transmits polling data to a terminal 2 in which an address is set.

[0035] When setting an address in terminal 2, data transmission unit 132 sequentially transmits addresses to be set in each terminal 2 from among the multiple addresses generated by address generation unit 131. As an example, data transmission unit 132 generates an address setting command including one of the multiple addresses generated by address generation unit 131, and transmits it to terminal 2 via communication unit 11. After transmitting one address, data transmission unit 132 transmits another address in response to response reception unit 133 receiving an address setting response from terminal 2. In this case, data transmission unit 132 sequentially transmits addresses until response reception unit 133 no longer receives an address setting response from terminal 2.

[0036] Data transmission unit 132 may resend the address setting command if response reception unit 133 does not receive a normal address setting response even when a predetermined time has elapsed after transmitting the address. By configuring data transmission unit 132 in this way, the address setting operation can be completed normally even if the response from terminal 2 is temporarily delayed for some reason, and the reliability of the system can be improved.

[0037] However, not only when addresses are set in all terminals 2, but also when a terminal 2 is out of order, a state occurs in which the response receiving unit 133 does not receive an address setting response. Thus, the terminal 2 that is set by the administrator of the fire alarm system S to be installed at the most downstream may transmit information indicating that it is installed at the most downstream to the control device 1 when transmitting the address setting response. In this case, the control device 1 transmits addresses sequentially until it receives information indicating that it is installed at the most downstream from the terminal 2. Furthermore, when the control device 1 does not receive an address setting response for a predetermined time or more despite not receiving information indicating that it is installed at the most downstream, it may display that an error has occurred.

[0038] Data transmitting unit 132 may sequentially transmit a plurality of addresses at a predetermined time interval without waiting for an address setting response. The predetermined time interval is, for example, a time equal to or longer than the maximum time required from when data transmitting unit 132 transmits an address until when response receiving unit 133 receives an address setting response. Data transmitting unit 132 may sequentially transmit the number of addresses accepted by setting accepting unit 134 at a predetermined time interval.

[0039] After transmitting the address, data transmitting unit 132 may transmit the next address after a time longer than the time required for the switching unit to switch the communication path from the restrictive connection state to the non-restrictive connection state after terminal 2 receives the address has elapsed. Since data transmitting unit 132 is configured in this way, data transmitting unit 132 can transmit the next address without waiting for response receiving unit 133 to receive the address setting response, and therefore the lead time until the address setting is completed can be shortened.

[0040] The response receiving unit 133 receives the address setting response transmitted from the terminal 2. The response receiving unit 133 notifies the data transmitting unit 132 that the address setting response has been received. The response receiving unit 133 stores in the storage unit 12 the address assigned to the terminal 2 that received the address setting response. When the received address setting response includes unique information of the terminal 2 that is different from the address, the response receiving unit 133 may store in the storage unit 12 the address and the unique information in association with each other.

[0041] The setting reception unit 134 receives a setting of the number of terminals 2 for which addresses are to be set. The setting reception unit 134 notifies the address generation unit 131 of the set number. When the setting reception unit 134 receives the number of terminals 2, the data transmission unit 132 sequentially transmits the number of addresses received by the setting reception unit 134. The setting reception unit 134 may receive an input of the number of terminals 2 from an input unit (not shown), or may receive an input of the number of terminals 2 from an operation terminal remotely connected via the communication unit 11.

[0042] [Device 2 configuration] 3 is a diagram showing the configuration of the terminal 2. The terminal 2 has a communication unit 21, a switching unit 22, a storage unit 23, and a control unit 24. The control unit 24 has an address receiving unit 241 and a switching control unit 242.

[0043] The communication unit 21 has a communication interface for communicating with the control device 1 via the communication line L. The communication unit 21 receives an address setting command transmitted by the control device 1, and inputs the received address setting command to the address receiving unit 241. The communication unit 21 also transmits an address setting response input from the response unit 243 to the control device 1.

[0044] The switching unit 22 switches the connection state of the communication path L between a limited connection state and a non-limited connection state. Here, the limited connection state is a state in which a signal transmitted from the control device 1 is not transmitted to the terminal 2 located downstream, and power supplied from the control device 1 is transmitted to the terminal 2 located downstream. The non-limited connection state is a state in which both the signal transmitted from the control device 1 and power are transmitted to the terminal 2 located downstream. For example, in response to the address receiving unit 241 receiving an address, the switching unit 22 switches the state of the communication path L between the control device 1 and the terminal 2 located downstream from the limited connection state to the non-limited connection state. The switching unit 22 switches the communication path, for example, in response to the level of a switching signal input from the switching control unit 242.

[0045] The storage unit 23 has a storage medium such as a ROM and a RAM. The storage unit 23 stores a program executed by the control unit 24. The storage unit 23 stores an address received by the address receiving unit 241. The storage unit 23 may also store unique information of the terminal 2.

[0046] The control unit 24 includes, for example, a CPU. The control unit 24 executes a program stored in the storage unit 23 to function as an address receiving unit 241 and a switching control unit 242.

[0047] The address receiving unit 241 receives an address setting command including an address transmitted from the control device 1. The address receiving unit 241 determines whether an address has been set by determining whether an address has been stored in the storage unit 23. When an address has not been stored in the storage unit 23, the address receiving unit 241 stores the address included in the received address setting command in the storage unit 23 as an address to be set in the terminal 2. When an address has been stored in the storage unit 23, the address receiving unit 241 does not store the received address in the storage unit 23.

[0048] When the address receiving unit 241 has stored the address in the storage unit 23, the address receiving unit 241 generates an address setting response indicating that the address has been received, and transmits the address setting response to the control device 1. After storing the address in the storage unit 23, the address receiving unit 241 may generate an address setting response in response to controlling the switching unit 22 to place the terminal 2 in a non-restrictive connection state, and transmit the address setting response to the control device 1 via the communication unit 21. The address receiving unit 241 may transmit the address setting response including unique information of the terminal 2. When the terminal 2 is installed at the most downstream, the address receiving unit 241 may transmit the address setting response including information indicating that the terminal 2 is installed at the most downstream.

[0049] The switching control unit 242 controls the switching unit 22 after the address receiving unit 241 receives the address. Specifically, the switching control unit 242 outputs a switching control signal to the switching unit 22 for switching the state of the terminal 2 between a limited connection state and a non-limited connection state.

[0050] [Circuit configuration overview] Fig. 4 is a diagram showing an outline of the circuit configuration of the control device 1 and the terminal 2. In the control device 1 and the terminal 2 shown in Fig. 4, the same components as those in the control device 1 and the terminal 2 shown in Fig. 1 to Fig. 3 are given the same reference numerals and their explanations are omitted. The terminal 2 further has a regulator 25. The regulator 25 generates a voltage for operating the memory unit 23 and the control unit 24 based on the power supplied from the control device 1 through the communication line L.

[0051] The switching unit 22 of the terminal 2 has a switching element 221, a switching element 222, a low-pass filter 223, a path 224, and a path 225. The low-pass filter 223 is provided on the path 224, and blocks a signal including an address setting command and passes a DC signal. The paths 224A and 225A of the terminal 2 in Fig. 4 constitute a first communication path, and the paths 224B and 225B of the terminal 2 constitute a second communication path. The first communication path and the second communication path pass a signal including an address setting command and do not pass a DC signal in a restrictive connection state in which the path 224 is used, and pass a signal including an address setting command and a DC signal in a non-restrictive connection state in which the path 225 is used.

[0052] The switching element 221 switches whether the communication line L between the terminal 2 and the control device 1 or the upstream terminal 2 is connected to the path 224 or the path 225. The switching element 222 switches whether the communication line L between the terminal 2 and the downstream terminal 2 is connected to the path 224 or the path 225. The switching element 221 and the switching element 222 are, for example, transistors or relays whose states are switched based on a switching control signal input from the control unit 24.

[0053] In the limited connection state, switching element 221A and switching element 222A of terminal 2A connect the control device 1 to terminal 2B present downstream via low-pass filter 223A provided on path 224. When terminal 2A is in the limited connection state, the address set in terminal 2A is not transmitted to terminal 2B via the first communication path, and power supplied from the control device 1 is transmitted to terminal 2B.

[0054] In a non-restrictive connection state, the switching element 221A and the switching element 222B of the terminal 2A connect the control device 1 to the terminal 2B, which is another downstream terminal 2, via the path 225A without passing through the low-pass filter 223A. The configuration and operation of the terminal 2B are similar to those of the terminal 2A, except that the device connected upstream is the terminal 2A instead of the control device 1.

[0055] [Processing flow in the control device 1 and terminal 2] Fig. 5 is a sequence diagram showing the flow of processing in the fire alarm system S. Fig. 6 is a diagram showing the flow of signals in the fire alarm system S. Below, the flow of processing in which the control device 1 sets addresses to multiple terminals 2 will be described with reference to Figs. 5 and 6.

[0056] As shown in Fig. 6A, power (61) supplied from the control device 1 to the terminal 2A is supplied to the terminal 2B via the low-pass filter 223A. The regulators 25A and 25B apply a predetermined voltage to the control units 24A and 24B based on the power supplied from the control device 1. The control units 24A and 24B control the switching elements 221A and 222A and the switching elements 221B and 222B, respectively, to set the terminals 2A and 2B to a limited connection state (S0 in Fig. 5).

[0057] Next, the control device 1 generates addresses to be assigned to the multiple terminals 2 (S1). Next, the control device 1 transmits an address setting command including the addresses to the terminal 2A (S2). In the example shown in Fig. 5, the control device 1 transmits an address setting command (63) including the address "00" to the terminal 2A. As shown in Fig. 6B, the address setting command (63) is input to the control unit 24A.

[0058] The address setting command (63) is also input to the switching unit 22A. High frequency components including the address setting command (63) are blocked by the low pass filter 223A and are not transmitted to the switching element 222A. As a result, the terminal 2B does not receive the address "00" set in the terminal 2A.

[0059] Upon receiving the address setting command (63), the control unit 24A determines whether or not the address is stored in the storage unit 23A. If the control unit 24A determines that the address is not stored in the storage unit 23A, it stores the address "00" included in the address setting command 63 in the storage unit 23A (S3).

[0060] When the control unit 24A stores the address "00" in the memory unit 23A, as shown in Fig. 6C, it inputs a switching control signal (64) to the switching unit 22A to switch the connection state of the switching unit 22A from the limited connection state to the non-limited connection state. The switching element 221A and the switching element 222A switch the connected path from the path 224A to the path 225A (S4). The control unit 24A transmits an address setting response (65) to the control device 1. Thereafter, the control unit 24A starts detecting the surrounding state using a sensor (not shown) (S5).

[0061] When the control device 1 receives the address setting response (65), it transmits the address of terminal 2B (S6). In the example shown in Fig. 5, it transmits an address setting command (66) including the address "01" to terminal 2B. As shown in Fig. 6D, the address setting command (66) is input to terminal 2A and terminal 2B.

[0062] The control unit 24A of the terminal 2A that has received the address setting command (66) determines whether or not the address is stored in the memory unit 23A. The control unit 24A determines that the address is stored in the memory unit 23A, and discards the received address setting command (66).

[0063] The control unit 24B of the terminal 2B that has received the address setting command (66) determines whether or not the address is stored in the memory unit 23B. As shown in Fig. 6D, when the control unit 24B determines that the address is not stored in the memory unit 23B, it stores the address "01" included in the address setting command (66) in the memory unit 23B (S7).

[0064] The address setting command (66) is also input to the switching unit 22B. High frequency components including the address setting command (66) are blocked by the low pass filter 223B and are not transmitted to the switching element 222B. As a result, the terminal 2 downstream of the terminal 2B does not receive the address "01" set in the terminal 2B.

[0065] After storing the address "01" in the memory unit 23B, the control unit 24B inputs a switching control signal (67) to the switching unit 22B to switch the connection state of the switching unit 22B from the limited connection state to the non-limited connection state, as shown in FIG. 6E. The switching element 221B and the switching element 222B switch the connected path from the path 224B to the path 225B (S8). The control unit 24B transmits an address setting response (68) to the control device 1. Thereafter, the control unit 24B starts detecting the surrounding state using a sensor (not shown) (S9). Note that the terminal 2 may start detecting the state after receiving a signal indicating an instruction to start detection from the control device 1.

[0066] When the control device 1 receives the address setting response (68), it transmits the address of the terminal 2 located downstream of the terminal 2B (69), as shown in Fig. 6F. Thereafter, the control device 1 repeats the same process until a termination condition is satisfied.

[0067] After setting the addresses, the control device 1 stores the addresses set in each terminal 2 in the storage unit 12. If the address setting is not completed normally, the control device 1 may notify the operator that an abnormality has occurred in the address setting by a display unit (not shown).

[0068] [Variations] In the above description, the case where power is supplied from the control device 1 to the terminal 2 via the communication line L has been exemplified, but the terminal 2 may have a battery and may not receive power supply from the control device 1. In this case, the low-pass filter 223 is not provided in the path 224 of the terminal 2, and in the limited connection state, the switching element 221 and the switching element 222 may be in a non-connected state.

[0069] [Effects of Fire Alarm System S] As described above, in the fire alarm system S, multiple terminals 2 are cascade-connected, and the control device 1 sequentially transmits the address to be set to each terminal 2. Then, in the terminal 2, in response to the address being received by the address receiving unit 241, the state of the communication path between the control device 1 or the upstream terminal 2 and the terminal 2 is switched from a limited connection state to a non-limited connection state. By configuring the control device 1 and the terminal 2 in this way, the control device 1 can automatically set different addresses to the multiple terminals 2 when no addresses have been set to the multiple terminals 2. As a result, it is possible to suppress the occurrence of mistakes in setting addresses to the terminals 2, and to improve the work efficiency when installing a large number of terminals 2.

[0070] Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of the gist of the present invention. For example, all or part of the device can be configured by distributing or integrating functionally or physically in any unit. In addition, new embodiments resulting from any combination of multiple embodiments are also included in the embodiments of the present invention. The effect of the new embodiment resulting from the combination combines the effect of the original embodiment. [Explanation of symbols]

[0071] 1 Control device 2. Terminal 11 Communications Department 12 Storage section 13 Control section 21 Communications Department 22 Switching section 221 Switching element 222 Switching element 223 Low-pass filter 224 Routes 225 Routes 23 Memory section 24 Control Unit 131 Address Generation Unit 132 Data transmission unit 133 Response Reception Unit 134 Settings reception section 241 Address receiver 242 Switching control section 243 Response section

Claims

1. A fire alarm system comprising a first terminal and a second terminal connected in cascade and a control device connected to the first terminal, The control device includes: an address generator that generates a plurality of different addresses; an address transmission unit that sequentially transmits, from among the plurality of addresses generated by the address generation unit, a first address that is set in the first terminal and a second address that is different from the first address and that is set in the second terminal; having The first terminal is a first address receiving unit that receives the first address transmitted by the address transmitting unit; a first address storage unit that stores the first address received by the first address receiving unit; a first switching unit that switches a state of a first communication path between the control device and the second terminal from a limited connection state in which the second address is not transmitted to a non-limited connection state in which the second address is transmitted in response to the first address receiving unit receiving the first address, a low-pass filter that blocks a signal including the second address and passes a DC signal; the first communication path through which a signal including the second address and a DC signal pass; the first switching unit having a switching element that connects the control device and the second terminal via the low-pass filter in the limited connection state and connects the control device and the second terminal via the first communication path in the non-limited connection state; having The second terminal is a second address receiving unit that receives the second address transmitted by the address transmitting unit via the first communication path that the first switching unit has put into the non-restrictive connection state; a second address storage unit that stores the second address received by the second address receiving unit; a second switching unit that switches a state of a second communication path between the first terminal and another terminal downstream of the second terminal from the limited connection state in which the address is not transmitted to the other terminal to the non-restrictive connection state in which the address is transmitted to the other terminal in response to the second address being received by the second address receiving unit; A fire alarm system having:

2. The first switching unit switches the state of the first communication path from the limited connection state in which the second address is not transmitted to the second terminal via the first communication path and power supplied from the control device is transmitted to the second terminal to the non-limited connection state in which the second address and the power are transmitted to the second terminal. The fire alarm system according to claim 1 .

3. The first address receiving unit stores the first address received from the control device in the first address storage unit on condition that the address is not stored in the first address storage unit.

3. A fire alarm system according to claim 1 or 2.

4. When the first address is stored in the first address storage unit, the first address receiving unit transmits a response signal to the control device indicating that the first address has been received. The fire alarm system according to claim 3.

5. the address transmission unit transmits the second address after a time longer than a time required from when the first terminal receives the first address until when the first switching unit switches the first communication path from the limited connection state to the non-restrictive connection state has elapsed after transmitting the first address; A fire alarm system according to any one of claims 1 to 4.

6. The control device further includes a setting receiving unit that receives a setting of the number of terminals to which the addresses are to be set, The address transmission unit sequentially transmits the addresses in the number accepted by the setting acceptance unit. A fire alarm system according to any one of claims 1 to 5.

7. A terminal used in a fire alarm system in a cascade-connected state between an upstream terminal and a downstream terminal, an address receiving unit that receives an address transmitted by a control device of the fire alarm system via the upstream terminal; an address storage unit that stores the address received by the address receiving unit; a switching unit that switches a communication path between the upstream terminal and the downstream terminal from a limited connection state in which the address is not transmitted to a non-limited connection state in which the address is transmitted in response to the address receiving unit receiving the address, a low-pass filter that blocks signals including the address and passes DC signals; the communication path through which a signal including the address and a DC signal pass; a switching element that connects the upstream terminal and the downstream terminal via the low-pass filter in the limited connection state, and connects the upstream terminal and the downstream terminal via the communication path in the non-restrictive connection state; The switching unit having A terminal having the above configuration.

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