Fire sensor, fire receiver, and fire notification system renewal method

Abstract

To solve the problem that a large cost load is generated at a time when both of a sensor and a receiver are exchanged at a time in a case where a P-type sensor is exchanged into a sensor with an address and also a P-type receiver is exchanged into an evolved receiver when a device is exchanged from a P-type fire notification system into an evolved fire notification system.SOLUTION: A fire sensor can be exchanged between a first mode to function as a first type sensor having no address and a second mode to function as a second type fire sensor having an address.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a method for renewing a fire detector, a fire receiver, and a fire alarm system that are attached to a ceiling surface or the like. [Background technology]

[0002] There are two types of fire alarm systems: P-type fire alarm systems and R-type fire alarm systems. P-type fire alarm systems send signals from P-type detectors via individual wiring through a common line for each alert area to a P-type receiver to alert people to a fire. R-type fire alarm systems send fire information signals from analog detectors and fire signals from repeaters over a common electrical line to an R-type receiver to alert people to a fire.

[0003] In an R-type fire alarm system, the R-type receiver receives smoke and other measurement values ​​from analog detectors and can determine whether or not there is a fire based on changes in the measurement values. Analog detectors are assigned addresses, and measurement values ​​are transmitted using the addresses via the transmission line connecting the R-type receiver and the analog detector. Therefore, the R-type receiver can identify the analog detector that detected smoke and other items among multiple analog detectors connected to one transmission line.

[0004] On the other hand, in a P-type fire alarm system, multiple P-type sensors are connected to a pair of sensing wires that connect to a P-type receiver. When a P-type sensor detects a fire, it shorts out the pair of sensing wires, sending a fire alert to the P-type receiver. The P-type receiver cannot determine which of the multiple P-type sensors connected to the pair of sensing wires detected the fire.

[0005] In addition to the above-mentioned P-type and R-type fire alarm systems, an evolved P-type fire alarm system has appeared in recent years (see Patent Document 1). This evolved fire alarm system uses addressed sensors, each with an address. Although multiple addressed sensors are connected to a pair of sensing lines, an evolved receiver can determine which addressed sensor has detected a fire. Furthermore, these addressed sensors have an automatic test function, and the results of the automatic test are received by the evolved receiver along with the address. As a result, the addressed sensor that has developed an abnormality can be identified by the evolved receiver. Therefore, it is preferable to replace old fire alarm systems such as P-type fire alarm systems with new fire alarm systems such as evolved fire alarm systems. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-285502 Summary of the Invention [Problem to be solved by the invention]

[0007] When replacing an old fire alarm system with a new one, the fire detectors compatible with the old system are replaced with fire detectors compatible with the new system, and the fire receivers compatible with the old system are replaced with receivers compatible with the new system. However, replacing both the fire detectors and the fire receivers at the same time results in a large financial burden. [Means for solving the problem]

[0008] The fire detector in one embodiment of the present invention is characterized by being switchable between a first mode in which it functions as a Type 1 fire detector without an address, and a second mode in which it functions as a Type 2 fire detector with an address. [Effects of the Invention]

[0009] According to the present invention, a Type 1 fire receiver corresponding to a Type 1 fire detector that does not have an address can be replaced with a fire detector of the present invention without replacing it, and then a Type 2 fire detector corresponding to a Type 2 fire detector that has an address can be replaced with a Type 2 fire receiver. The Type 1 fire detector is, for example, a P-type detector, and the Type 2 fire detector is, for example, a detector with an address. [Brief explanation of the drawings]

[0010] [Figure 1] A diagram of a conventional P-type fire alarm system. [Figure 2] A diagram of the configuration of a conventional SP-type fire alarm system. [Figure 3] Configuration diagram of an SP type fire detector. [Figure 4] 1 is a configuration diagram of a fire detector according to an embodiment of the present application. [Figure 5] FIG. 1 is a diagram showing a configuration in which a fire detector according to an embodiment of the present application is connected to a P-type receiver. [Figure 6] FIG. 1 is a diagram showing a configuration in which a fire detector according to an embodiment of the present application is connected to an SP type receiver. [Figure 7] FIG. 3 is a flowchart showing a process for activating a fire detector according to an embodiment of the present application. [Figure 8] FIG. 3 is a flow diagram of a first mode of the fire detector according to the embodiment of the present application. [Figure 9] FIG. 4 is a flow diagram of a second mode of the fire detector according to the embodiment of the present application. [Figure 10] FIG. 10 is a sequence diagram when a fire detector according to an embodiment of the present application is connected to a P-type receiver. [Figure 11] FIG. 2 is a sequence diagram according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0011] Before describing the embodiments of the present invention, a P-type fire alarm system 1 and an SP-type fire alarm system 2, which are conventional fire alarm systems, will be described. In the following, the P-type fire alarm system 1 is an example of a Type 1 fire alarm system, which is an older fire alarm system, the P-type sensor 11 is an example of a Type 1 sensor, and the P-type receiver 12 is an example of a Type 1 receiver. The SP-type fire alarm system 2 is an example of a Type 2 fire alarm system, which is a newer fire alarm system, the SP-type sensor 21 is an example of a Type 2 sensor, and the SP-type receiver 22 is an example of a Type 2 receiver.

[0012] Figure 1 shows a configuration diagram of a conventional P-type fire alarm system 1. The P-type fire alarm system 1 is an older fire alarm system and includes multiple P-type sensors 11, a P-type receiver 12, a pair of sensing lines 3, and a terminal device 4. The ends of the pair of sensing lines 3 are connected by the terminal device 4. The P-type receiver 12, which is the fire receiver in the P-type fire alarm system 1, is connected to multiple pairs of sensing lines 3, and multiple P-type sensors 11 are connected to each pair of sensing lines 3. The P-type receiver 12 is a Type 1 fire receiver that does not use addresses.

[0013] A plurality of P-type sensors 11 are connected in parallel between the pair of sensing lines 3, and a P-type sensor 11 that detects a fire shorts out the pair of sensing lines 3. Therefore, the P-type receiver 12 of the P-type fire alarm system 1 cannot determine which of the P-type sensors 11 connected to the pair of sensing lines 3 has detected the fire.

[0014] Figure 2 shows a configuration diagram of a conventional SP type fire alarm system 2. The SP type fire alarm system 2 is a new fire alarm system, and is equipped with multiple SP type sensors 21, an SP type receiver 22, a pair of sensing lines 3, and a terminal device 4. The ends of the pair of sensing lines 3 are connected by the terminal device 4. The SP type receiver 22, which is a fire receiver in the SP type fire alarm system 2, is connected to multiple pairs of sensing lines 3, and multiple SP type sensors 21 are connected to each pair of sensing lines 3. The SP type receiver 22 is a second type fire receiver that uses an address.

[0015] 3 shows the configuration of the SP type sensor 21. The SP type sensor 21 includes a control circuit 211, a memory 212, a light emitting circuit 213, a light receiving circuit 214, a fire confirmation light 215, a power supply circuit 216, a transmitting circuit 217, and a receiving circuit 218. The power supply circuit 216, the transmitting circuit 217, and the receiving circuit 218 are connected to the sensing line 3. The SP type sensor 21 is an addressed fire sensor, and the memory 212 stores an address that identifies each SP type sensor 21.

[0016] A control circuit 211, which is a CPU, is connected to a memory 212, a light emitting circuit 213, a light receiving circuit 214, a fire confirmation light 215, a transmitting circuit 217, and a receiving circuit 218, and operates according to a program stored in the memory 212. The light emitting circuit 213 emits light intermittently under the control of the control circuit 211. The light receiving circuit 214 sends an output indicating the amount of received light, which has been converted into a digital signal by an A / D converter provided inside, to the control circuit 211.

[0017] The power supply circuit 216 obtains power from the voltage applied to the sensing line 3 and supplies the power to the internal circuitry of the SP type sensor 21. The transmitting circuit 217 transmits a signal to the SP type receiver 22 via the sensing line 3 under the control of the control circuit 211. In addition, the receiving circuit 218 receives a signal from the SP type receiver 22 via the sensing line 3 and transmits it to the control circuit 211.

[0018] When a fire breaks out and smoke enters the SP type detector 21, light from the light-emitting circuit 213 is scattered and detected by the light-receiving circuit 214. The light detected by the light-receiving circuit 214 is amplified and converted into a digital signal by an A / D converter and transmitted to the control circuit 211. The control circuit 211 determines whether there is a fire based on the digital signal, and if so, transmits a fire detection signal from the transmission circuit 217 to the SP type receiver 22 via the sensing line 3. This fire detection signal also contains information about the address stored in the memory 212. The SP type receiver 22 receives the fire detection signal via the sensing line 3, determines which SP type detector 21 has detected the fire from the address included in the fire detection signal, and issues a fire alert. Furthermore, if it determines that there is a fire, the control circuit 211 sends a light-emitting command to the fire confirmation light 215. Upon receiving the light-emitting command, the fire confirmation light 215 emits red light. Red is the fire detection color.

[0019] Furthermore, the SP type detector 21 has an automatic test function. The results of the automatic test are received by the SP type receiver 22 together with the address of the SP type detector 21. Because the SP type fire alarm system 2 can perform automatic testing, an inspection worker does not need to go around to each SP type detector 21 to perform a smoke test or a heat test, thereby reducing the test time and cost. The P type detector 11 does not have an address, but the SP type detector 21 does.

[0020] Next, a fire detector 5 according to an embodiment of the present invention will be described. Fig. 4 shows the configuration of the fire detector 5. The fire detector 5 includes a control circuit 51, a memory 52, a light emitting circuit 53, a light receiving circuit 54, a fire confirmation light 55, a power supply circuit 56, a transmitting circuit 57, a receiving circuit 58, and a short circuit 59. The power supply circuit 56, the transmitting circuit 57, the receiving circuit 58, and the short circuit 59 are connected to the sensing line 3. In the fire detector 5, an address for identifying each individual fire detector 5 is stored in the memory 52.

[0021] Control circuit 51, which is a CPU, is connected to memory 52, light-emitting circuit 53, light-receiving circuit 54, fire confirmation light 55, transmitting circuit 57, receiving circuit 58, and short-circuit 59, and operates according to a program stored in memory 52 to control these. Light-emitting circuit 53 emits light intermittently under the control of control circuit 51. Light-receiving circuit 54 sends an output indicating the amount of received light, which has been converted into a digital signal by an A / D converter installed inside, to control circuit 51.

[0022] The power supply circuit 56 obtains power from the voltage applied to the sensing line 3 and supplies power to the internal circuitry of the fire detector 5. The transmitting circuit 57 transmits a signal via the sensing line 3 under the control of the control circuit 51. The receiving circuit 58 receives the signal via the sensing line 3 and transmits it to the control circuit 51. When a fire is determined to be present, the control circuit 51 sends a light-up command to the fire confirmation light 55. Upon receiving the light-up command, the fire confirmation light 55 emits red light, which is the fire detection color.

[0023] Unlike conventional SP-type detectors 21, fire detector 5 has a short circuit 59. Fire detector 5 can be switched between a first mode in which it functions as a P-type detector 11, a Type 1 fire detector without an address, and a second mode in which it functions as an SP-type detector 21, a Type 2 fire detector with an address. Fire detector 5 can be connected to a P-type receiver 12 as shown in FIG. 5, or to an SP-type receiver 22 as shown in FIG. 6. Therefore, when upgrading the P-type fire alarm system 1 shown in FIG. 1, P-type detector 11 can be replaced with fire detector 5 while leaving P-type receiver 12 as shown in FIG. 5. In the configuration of FIG. 5, fire detector 5 functions as P-type detector 11, and the entire system is operated as a P-type fire alarm system. After operating with the configuration of FIG. 5, P-type receiver 12 is replaced with SP-type receiver 22 to achieve the configuration of FIG. 6, completing the upgrade.

[0024] In Figure 5, in the P-type fire alarm system 1 shown in Figure 1, all of the P-type sensors 11 have been replaced with fire sensors 5. However, it is also possible to replace only some of the P-type sensors 11 with fire sensors 5 and operate them together with the remaining P-type sensors 11. In this case, the fire sensors 5 still function as P-type sensors 11, and the system as a whole is operated as a P-type fire alarm system. Then, after operation, the P-type receivers 12 are replaced with SP-type receivers 22, and the remaining P-type sensors 11 are replaced with fire sensors 5, completing the renewal as shown in Figure 6. It is also possible to replace the remaining P-type sensors 11 with SP-type sensors 21 during renewal.

[0025] The setting of the fire detector 5 to either the first mode or the second mode can be determined by a selector switch provided on the fire detector 5, or by writing the setting to the memory 52 before installation in a building. However, the fire detector 5 of this embodiment automatically sets the setting when activated.

[0026] <Fire detector 5 activation flow> FIG. 7 shows a flow diagram of the startup process of the installed fire detector 5. When the fire receiver is powered on after the fire detector 5 is installed, a voltage is generated between the pair of sensing wires 3. This causes the fire detector 5 to receive power via the power supply circuit 56 and start up (step S1). Upon startup, the control circuit 51 sets the first mode in the memory 52 (step S2). Then, it is determined whether a second mode setting signal is received via the sensing wire 3 (step S3). If the second mode setting signal is received (YES), the mode stored in the memory 52 is changed from the first mode to the second mode (step S4), the fire confirmation light 55 is illuminated (step S6), and the startup process ends. On the other hand, if the second mode setting signal is not received (NO), it is determined whether the elapsed time t since startup is greater than a predetermined time (step S5). In this embodiment, the predetermined time is 180 seconds as shown in FIG. 7, but this is merely an example and other lengths of time may be used. If the result is YES, that is, the time elapsed since startup t is greater than the predetermined time, the fire confirmation light 55 is illuminated in a color corresponding to the mode (step S6), and the startup flow ends. In this embodiment, the light is lit in green in the first mode, and in yellow in the second mode. Green and yellow are colors different from red, which is the fire detection color. This makes it possible to recognize from outside which mode the fire detector 5 is in. On the other hand, if the result is NO, the process returns to before step S3. The mode of the fire detector 5 is set at startup when the supply of voltage to the fire detector 5 begins.

[0027] <Fire monitoring flow for mode 1> Once the startup steps are completed and the first mode is set, the flow shown in Fig. 8 is executed. In the fire monitoring flow for the first mode, it is determined whether a fire has been detected (step S11). If a fire has been detected (YES), the short circuit 59 is shorted (step S12) and the process ends. On the other hand, if a fire has not been detected (NO), the process returns to before step S11 and continues monitoring for fire detection by repeating step S11.

[0028] <Fire monitoring flow for mode 2> When the steps at startup are completed and the second mode is set, the flow shown in FIG. 9 is executed. In the fire monitoring flow of the second mode, an automatic test can also be performed. In this flow, it is determined whether an automatic test command has been received (step S21). If YES, that is, an automatic test command has been received, an automatic test is carried out (step S22). Then, the automatic test result is transmitted via the sensing line 3 (step S23), and the process returns to before step S21. If NO, that is, no automatic test command has been received in step S21, it is determined whether a fire has been detected (step S24). If YES, that is, a fire has been detected, the fire detector 5 sends out a fire detection signal from the transmission circuit 57 (step S25) and ends. This fire detection signal contains the address of the fire detector 5 stored in the memory 52. On the other hand, if NO, that is, no fire has been detected in step Sli, the process returns to before step S21.

[0029] <Sequence in the case of the P-type receiver 12> When the fire detector 5 is attached with the P-type receiver 12 as the receiver as shown in FIG. 5, the sequence shown in FIG. 10 occurs. Between the fire detector 5 and the P-type receiver 12, they are connected by a pair of sensing lines 3 as shown in FIG. 5. After the fire detector 5 is attached to the fire alarm system equipped with the P-type receiver 12 and the power of the P-type receiver li is turned on (step SS11), the P-type receiver 12 supplies a voltage between the sensing lines 3 (step SS12). Then, the fire detector 5 obtains power from the power circuit 56 by the voltage of the sensing line 3 and starts up (step SS13). And it is set to the first mode (step SS14). When a predetermined time has elapsed since the startup of the fire detector 5, the fire confirmation lamp 55 emits light in green indicating the first mode (step SS15), and the sequence of the startup flow ends.

[0030] When the elapsed time t after startup exceeds a predetermined time and the startup flow ends, the fire monitoring flow in the first mode is entered. When the fire detector 5 detects a fire (step SS16), the fire confirmation lamp 55 emits red light (step SS17), and the control circuit 51 shorts the pair of sensing lines 3 through the short - circuit circuit 59 (step SS18). As a result, the voltage between the pair of sensing lines 3 becomes 0V, and the P - type receiver 12 detects the voltage drop of the sensing line 3 (step SS19). Then, the P - type receiver 12 gives a fire alarm (step SS20).

[0031] <Sequence in the case of the SP - type receiver 22> When the fire detector 5 is attached with the SP - type receiver 22 as the receiver as shown in FIG. 6, the sequence shown in FIG. 11 is followed. Between the fire detector 5 and the SP - type receiver 22, they are connected by a pair of sensing lines 3 as shown in FIG. 6. After the fire detector 5 is attached to the fire alarm system equipped with the SP - type receiver 22 and the power of the SP - type receiver 22 is turned on (step SS31), the SP - type receiver 22 supplies a voltage between the sensing lines 3 (step SS32).

[0032] Then, the fire detector 5 starts up by obtaining power from the power supply circuit 56 by the voltage of the sensing line 3 (step SS33). And it is set to the first mode (step SS34).

[0033] After that, the SP - type receiver 22 transmits a second - mode setting signal within a predetermined time (step SS35). The second - mode setting signal is a digital signal, and in the SP - type fire alarm system 2 equipped with the SP - type sensor 21 and the SP - type receiver 22, when the power of the SP - type receiver 22 is turned on, the signal transmitted to the SP - type sensor 21 is diverted. The fire detector 5 that has received the second - mode setting signal by the receiving circuit 58 rewrites the first mode, which is the mode stored in the memory 52, to the second mode by the control circuit 51 (step SS36). Then, the fire confirmation lamp 55 emits yellow light (step SS37), and the sequence of the startup flow ends.

[0034] When the startup flow is completed, the second mode fire monitoring flow is entered, and automatic testing of the fire detector 5 becomes possible. During automatic testing, an automatic test command is transmitted from the SP type receiver 22 (step SS41). The automatic test command is a digital signal and is transmitted to the fire detector 5 via the pair of sensing lines 3.

[0035] When the fire detector 5 receives the automatic test command via the receiving circuit 58, the control circuit 51 performs the automatic test using software stored in the memory 52 (step SS42). In this embodiment, the test is performed by receiving simulated scattered light from a test light-emitting element (not shown) via the light-receiving circuit 54. If a fire is simulatedly detected in the test using simulated scattered light, the test result is "normal." If no fire is detected during the test using simulated scattered light, the test result is "abnormal." When the automatic test is completed, the fire detector 5 transmits automatic test result information as a digital signal from the transmitting circuit 57 via the sensing line 3 (step SS43).

[0036] The SP type receiver 22 receives the automatic test result information from the sensing line 3 and records the test result (step SS44). If the test result is "abnormal", it notifies the user (step SS45).

[0037] In the second mode fire monitoring flow, when the fire detector 5 detects a fire (step SS51), the fire confirmation light 55 is caused to emit red light (step SS52), and the control circuit 51 transmits a fire detection signal from the transmission circuit 57 to the detection line 3 (step SS53). The fire detection signal is a digital signal and includes an address that identifies the fire detector 5.

[0038] When the SP type receiver 22 receives the fire detection signal on the sensing line 3, it issues a fire alarm (step SS54). Since the fire detection signal includes the address of the fire detector 5, this address is used as the information source to issue a fire alarm that also includes which fire detector 5 detected the fire. Because the address is used, even if multiple fire detectors 5 are connected to a pair of sensing lines 3, it is possible to report which fire detector 5 detected the fire. In this embodiment, the location where the fire was detected is reported based on the address and installation location data of the fire detector 5 stored in the SP type receiver 22.

[0039] In this embodiment, the fire detection light 55 is illuminated in a first color and a second color different from the fire detection color, thereby indicating whether the detector is in the first mode (functioning as a P-type detector) or the second mode (functioning as an SP-type detector). Even if either the first or second color is turned off, the first or second mode can still be indicated. Alternatively, the first or second mode can be indicated not by color but by the timing of light emission or by an indicator light other than the fire detection light. Furthermore, by providing a display device capable of displaying characters on the fire detector and indicating whether the detector is in the first or second mode, the type of detector it functions as can be indicated. If the display device uses a display element, such as an electrochromic element, that requires power only when the display changes, no power consumption is required after activation, and the display can be similar to a function indication using a normal sticker or the like. In the above example, the fire detector 5 is provided with a display unit to indicate whether the detector is in the first or second mode, but such a display is not necessary.

[0040] The fire detector 5 of the embodiment determines the mode depending on whether or not there is communication within a predetermined time after voltage is supplied, but the mode may also be confirmed and changed by periodically checking whether or not there is communication.

[0041] The second mode setting signal in the embodiment is a digital signal, and is a signal that is transmitted to the SP type sensor 21 when the power of the SP type receiver 22 is turned on in the SP type fire alarm system 2 that includes the SP type sensor 21 and the SP type receiver 22. However, the second mode setting signal may be a signal dedicated to setting the second mode.

[0042] A conventional SP-type sensor 21 may be configured to temporarily lower the voltage of the sensing line 3 when detecting a fire, then return it to a low voltage, and then send an address to the sensing line 3. In this case, it is possible to replace the P-type sensor 11 with the SP-type sensor 21 while leaving the P-type receiver 12 in place during renewal. However, because the SP-type sensor 21 performs address-related operations, it uses more current than the P-type sensor 11. Therefore, if multiple P-type sensors 11 attached to a pair of sensing lines 3 are replaced with the same number of SP-type sensors 21 during renewal, the current capacity of the P-type receiver 12 may be exceeded. In the fire sensor 5 according to the embodiment of the present invention, address-related operations are not performed when operating in the first mode, and therefore current can be reduced when connected to the P-type receiver 12.

[0043] The above embodiment illustrates a method for renovating a fire alarm system (P-type fire alarm system 1) equipped with a Type 1 fire detector (P-type detector 11) that does not have an address and a Type 1 fire receiver (P-type receiver 12) that does not use an address. In this renovation method, the Type 1 fire detector (P-type detector 11) is replaced with a fire detector 5 in a first stage of renovation, and then, some time later, the Type 1 fire receiver (P-type receiver 12) is replaced with a Type 2 fire receiver (SP-type receiver 22) that uses an address in a second stage of renovation. This allows the renovation work to be carried out in multiple stages, preventing the client from incurring a large expense all at once. However, the fire detector 5, which can be switched between a first mode in which it functions as a Type 1 fire detector and a second mode in which it functions as a Type 2 fire detector, functions as both a Type 1 fire detector and a Type 2 fire detector. Therefore, even if it is not used for renovation, instead of manufacturing two types of fire detectors, Type 1 and Type 2, it is possible to manufacture one type of fire detector and install it in a building, which can be used as either type of fire detector, and there is also the advantage of manufacturing costs due to the reduced lineup.

[0044] Furthermore, the specific configuration is not limited to the embodiments, and the present invention includes design changes within the scope of the gist of the present invention. Furthermore, the above-described embodiments and modifications can be combined by utilizing each other's technologies as long as there are no particular contradictions or problems in the purpose, configuration, etc. [Explanation of symbols]

[0045] 1 P-type fire alarm system, 11 P-type detector, 12 P-type receiver, 2 SP type fire alarm system, 21 SP type detector, 211 control circuit, 212 memory, 213 light emitting circuit, 214 light receiving circuit, 215 fire confirmation light, 216 power supply circuit, 217 transmitting circuit, 218 receiving circuit, 22 SP type receiver, 3 sensing wires, 4 terminating equipment, 5 Fire detector, 51 Control circuit, 52 Memory, 53 Light emitting circuit, 54 Light receiving circuit, 55 Fire indicator light, 56 Power supply circuit, 57 Transmitting circuit, 58 Receiving circuit, 59 Short circuit

Claims

1. The device is switchable between a first mode in which it functions as a Type 1 fire detector without an address and a second mode in which it functions as a Type 2 fire detector with an address. A fire detector characterized by:

2. The alarm is in the first mode, and when a second mode setting signal is received from the fire control panel, the alarm is switched to the second mode.

2. The fire detector according to claim 1.

3. a display device that displays whether the mode is the first mode or the second mode; 3. A fire detector according to claim 2.

4. The display device indicates whether the device is in the first mode or the second mode by lighting up a fire confirmation light in a first color or a second color different from the fire detection color, or indicates whether the device is in the first mode or the second mode in characters on the display device.

4. A fire detector according to claim 3.

5. When connected to a fire detector, a second mode setting signal is transmitted to set the fire detector to the second mode. A fire receiver characterized by:

6. A renewal method for a fire alarm system equipped with a first-type fire detector that does not have an address and a first-type fire receiver that does not use an address, In the first construction, the first type fire detector is replaced with a fire detector according to any one of claims 1 to 3, and in the second construction, the first type fire receiver is replaced with a second type fire receiver using an address. A method for renewing a fire alarm system, comprising:

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