JP3326018B2 - Fire alarm system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of terminal devices, such as a fire detector and a repeater, connected to a receiving unit, each terminal device being given an address, and detecting a terminal device whose status has changed. In addition, the present invention relates to a fire alarm system that detects a disconnection between each terminal device and a receiving unit.

[0002]

2. Description of the Related Art A plurality of terminal devices such as a fire detector are connected to a receiving unit, addresses are assigned to the respective terminal devices, and a fire alarm system for detecting a terminal device whose status has changed is one of terminal devices. Japanese Patent Laid-Open Publication No. Hei.
A fire alarm system shown in No. 7 has been proposed.

In this conventional example, terminal devices are divided into a plurality of groups, and the timing at which the terminal devices respond to the receiving unit differs for each group of terminal devices. Then, the terminal device whose status has changed responds to the receiving unit (performs system polling), and then responds to the receiving unit for each terminal device in the group to which the terminal device responding to the receiving unit in this system polling belongs. The terminal device whose state has changed responds to the receiving unit at the response timing assigned to itself (performs point polling), calls the terminal device that responded to the receiving unit in this point polling, and from this terminal device, The information is collected (selected) by the receiving unit.

[0004] In this way, the operation of obtaining predetermined information is executed only for the terminal device whose state has changed, and the operation of obtaining information is not executed for the terminal device whose state does not change. A change in the state of the terminal device can be grasped in a shorter time than when sequentially obtaining predetermined information.

[0005]

In the above-mentioned prior art, every time the system polling is executed a predetermined number of times, terminal devices are sequentially called to collect specific information, and the terminal capable of collecting the specific information is used. The device determines that it is normally connected to the receiving unit, but if it cannot collect specific information after calling the terminal device, the terminal device is not connected to the receiving unit and a disconnection has occurred. Thus, the disconnection monitoring is performed in this manner.

However, as described above, if each terminal device is called one by one and specific information is collected, there is a problem that the time required to complete the calling for all the terminal devices for disconnection monitoring becomes considerably long. is there. In other words, when a disconnection occurs between a certain terminal device and the receiving unit, if the calling order of the terminal device is late, there is a problem that the time until the disconnection is detected becomes long.

According to the present invention, a plurality of terminal devices are connected to a receiving unit, each terminal device is given a different address,
To provide a fire alarm system that can detect a disconnection of a terminal device quickly even if the order of calling the terminal device is late, in a fire alarm device that detects a disconnection between each terminal device and a receiving unit. It is intended for.

[0008]

According to the present invention, a plurality of terminal devices are grouped, and a receiving unit simultaneously calls terminal devices belonging to the group in order to detect disconnection, and the called terminal device responds with a pulse. The timing of responding to the receiving unit differs between the simultaneously called terminal devices.

[0009]

According to the present invention, a plurality of terminal devices are grouped, and the receiving unit simultaneously calls the terminal devices belonging to the group in order to detect a disconnection, and the called terminal device responds with a pulse and is called simultaneously. Between terminal devices,
Since the timing of responding to the receiver has been made different,
Even if the calling order of the terminal device is late, disconnection of the terminal device can be quickly detected.

[0010]

FIG. 1 is a time chart showing an embodiment of the present invention, and FIG. 2 is a wiring diagram of a fire alarm system to which the above embodiment is applied.

In the example shown in FIG. 2, a fire detector S (smoke type, thermal type, flame type,
Gas type, smell type fire detectors), transmitter P, repeater R
Various terminal devices such as P are connected, and different addresses are assigned to these terminal devices, and these terminal devices are divided into four groups G0, G1, G2, and G3.

The group G0 includes three fire detectors S and one transmitter P, the group G1 includes three fire detectors S and one transmitter P, and the group G2 includes: Two fire detectors S, one repeater RP, and one transmitter P belong to the group G3, and three fire detectors S and one transmitter P belong to the group G3. The addresses of the terminal devices are assigned address 0, address 1, address 2,..., Address 15 sequentially from the first address of the group G0. A plurality of on / off general sensors (having no address) for transmitting a fire signal due to a short circuit between wires are connected to the repeater RP at the address 10.

In this example, the number of terminal devices in one group is four. However, the number may be other than four.
Although the number of groups is four, the number of groups may be divided into groups other than four. Further, the grouping in disconnection determination polling, which will be described later, may be made different from the grouping in transmitter system polling and normal system polling. That is, the terminal devices may be grouped so that, for example, the terminal devices belonging to the group G0 in the disconnection determination polling are different from the terminal devices belonging to the group G0 in the system polling.

The receiver RE has a local acoustic connection line L
2, a plurality of district bells B are connected, a plurality of smoke elimination devices ER are connected via a smoke elimination connection line L3, and a plurality of displays are connected via a display connection line L4. .

In the above embodiment, the control system terminal devices such as the district bell B, the smoke control device ER, and the display device AN are not provided with addresses, and have individual signal lines L2 for each terminal device or system. L4 is turned on and off (so-called P wiring connection), and the monitoring system terminal devices such as the fire detector S, the transmitter P, and the repeater RP are serially transmitted by two common power / signal lines L1. The address can be designated by such as, and can be controlled individually (so-called R wiring connection).

The receiver RE normally performs system polling,
Before performing point polling and selecting,
It performs system polling for transmitter, point polling for transmitter, and selecting.

Here, "normal system polling"
The terminal devices are divided into a plurality of groups in advance, and instead of specifying the terminal device whose status has changed, only the presence or absence of the terminal device whose status has changed is checked for each group, that is, polling is performed. The timing of responding to the device RE is made different for each group of terminal devices, and the terminal device whose status has changed responds to the receiver RE at the response timing assigned to the group to which the terminal device belongs (eg, responds by sending a pulse). Polling.

"Normal point polling" is polling for specifying a terminal device that has responded to normal system polling (that is, polling for specifying a terminal device whose status has changed). Terminal equipment belonging to the receiver R
E makes a call, and changes the timing of responding to the receiver RE (for example, the timing of responding by sending a pulse) for each terminal device in the group, and the terminal device whose state has changed is assigned to the terminal device itself. The polling is a response to the receiver RE (for example, a response by sending a pulse) at the timing of response to the device RE.

The "selecting" corresponding to the normal point polling means that, when the terminal device responds to the receiver RE in the normal point polling, the terminal device responding to the normal point polling among the terminal devices in the corresponding group. Polling in which the REs individually call and the receiver RE collects specific information (for example, by a code signal).

"System polling for transmitter"
As in the case of the normal system polling described above, the terminal devices are divided into a plurality of groups in advance, and instead of specifying the transmitter whose status has changed, only the presence or absence of the transmitter whose status has changed is transmitted. This is a polling for checking only the transmitters for each group, that is, the timing of responding to the receiver RE is made different for each group, and the transmitter whose status has changed receives the response timing assigned to the group to which it belongs. The polling responds to the RE (for example, responds by sending a pulse).

"Transmitter point polling" is a polling for specifying a transmitter that has responded to the transmitter system polling. A transmitter belonging to a group responding to the receiver RE in the transmitter system polling is called. The timing of responding to the receiver RE is made different for each transmitter in the group, and the transmitter whose state has changed responds to the receiver RE at the response timing assigned to itself (for example, responds by transmitting a pulse). Polling.

The "selecting" corresponding to the transmitter point polling is, when the transmitter P responds to the receiver RE in the transmitter point polling, the transmitter point polling among the transmitters P in the group. Are called individually, and the receivers R
E is polling for collecting specific information (for example, collecting with a code signal).

In the "disconnection determination polling", a plurality of terminal devices are grouped, and a receiving unit simultaneously calls terminal devices belonging to the group in order to detect a disconnection, and the called terminal device responds with a pulse, The polling is different in timing of responding to the receiving unit between the simultaneously called terminal devices.

In this case, all of the plurality of terminal devices may belong to one group, the plurality of terminal devices may be divided into a plurality of groups, and the plurality of terminal devices may be divided into a plurality of groups. Is to make the timing of calling by the receiving unit different for each group, and simultaneously call the terminal devices belonging to one group in order to detect disconnection, and respond to the receiving unit between the simultaneously called terminal devices. Are different from each other.

Next, the operation of the above embodiment will be described.

FIG. 1 is a time chart showing an embodiment of the present invention.

In FIG. 1, the operation proceeds from the upper left to the upper right, the operation proceeds from the right end to the left end of the next lower stage, and the processing proceeds sequentially in this manner.

In FIG. 1, the operation of the receiver RE is shown above the horizontal line, and the operation of the terminal equipment is shown below the horizontal line.

In the system polling for the transmitter and the normal system polling shown in FIG. 1, a frame indicated by a broken line indicates a response timing to four groups of signals indicating that a state change has occurred. If not, it indicates that the terminal device did not output a signal indicating a state change (that is, did not respond to polling), and if a pulse waveform is described in the frame of the broken line, The response to the receiver RE is shown at the timing indicated by the broken-line frame.

On the other hand, in the disconnection discrimination polling of FIG. 1, a broken-line frame indicates the response timing of a signal indicating that no disconnection has occurred to the four terminal devices. Indicates that a disconnection has occurred (that is, did not respond to the disconnection determination polling), and if a pulse waveform is described in the frame of the broken line, a response is made to the receiver RE at the timing of the frame of the broken line. It is shown that it did.

FIG. 1 is a time chart in a case where there is no terminal device whose state has changed in the above embodiment (that is, a time chart in a normal state).

First, at P1 in FIG. 1, prior to the normal system polling, system polling for the transmitter is performed in order to determine the presence or absence of the activated transmitter P. That is, all the terminal devices are grouped into several groups (grouped into four groups in FIG. 1), and the receiver RE sends out a signal SPAD · CM1 indicating a status information return command in system polling for the transmitter. The transmitter P (operated transmitter) P whose state has changed with respect to has changed its state at each response timing of the groups G0 to G3 to which the transmitter belongs (response timings different from each other are given in advance for each group). By sending a pulse indicating this to the receiver RE.

In this transmitter system polling, if there is no transmitter P whose state has changed, then
At P2 in FIG. 1, normal system polling is performed to determine whether or not all terminal devices including the transmitter P have changed. That is, the receiver RE performs the code SPAD · C indicating the status information return instruction in the normal system polling.
M2 is sent, and if there is a terminal device whose state has changed, the terminal device belongs to the group G0 to G3 to which it belongs.
At each response timing (a different response timing is assigned in advance to each group), a response indicating that the state has changed is sent to the receiver RE.

In this normal system polling, if there is no terminal device whose status has changed, then in P3 of FIG. 1, disconnection determination polling is performed on the terminal devices belonging to the group G0. That is, in order to determine the disconnection of the terminal device belonging to the group G0 (that is, to determine whether or not there is a connection), a code GAD (0) .CM3 indicating a connection information return command is transmitted. The terminal device to which it belongs returns a pulse to the receiver RE at its own response timing. When the receiver RE receives the pulse, the receiver RE can confirm that the disconnection has not occurred with the terminal device corresponding to the response timing.

Thereafter, in P4 of FIG. 1, the same system polling for the transmitter as in P1 is performed again, and in P5 in FIG. 1, the same normal system polling as in P2 is performed again. 1 is the same as the disconnection determination polling in P3, but the disconnection determination polling is simultaneously performed for four terminal devices belonging to the next group G1, and in P7 in FIG.
The same system polling for the transmitter as in 1 is performed, and these operations are repeated. That is, the system polling for the transmitter and the normal system polling are repeated, and each time these system polling is completed for one cycle, the disconnection determination polling is simultaneously performed for the four terminal devices belonging to the group whose group number is incremented by one.

In the above embodiment, a plurality of terminal devices are grouped, and the receiver RE simultaneously calls a plurality of terminal devices belonging to the group in order to detect disconnection, and the called terminal device responds with a pulse, Since the timing of responding to the receiver RE is different between the simultaneously called terminal devices, the disconnection detection for the four terminal devices is completed almost simultaneously, that is, the disconnection detection for one terminal device is performed. The time can be shortened, and therefore, even if the calling order of the terminal device is late, the receiver RE can quickly detect the disconnection of the terminal device.

Although the number of terminal devices belonging to one group is four in FIG. 1, 16 terminal devices actually belong to one group. Further, the number of terminal devices belonging to one group may be set to a value other than 4 or 16.

Further, in the above embodiment, even if the normal system polling and the subsequent normal point polling and selecting take a long time, the transmitter system polling must be performed before the normal system polling. When the transmitter P operated by human judgment is operated, the receiver RE can quickly grasp the fire information from the transmitter P, and the larger the fire alarm system, the greater the effect. Is big.

FIG. 3 shows the fire receiver R in the above embodiment.
FIG. 9 is a block diagram showing an example of E and an example of a device connected to the receiver RE.

The receiver RE includes a microprocessor MPU
1, RAM 11, RAM 13 to RAM 19, and ROM
It has 11 to ROM13, IF11 to IF14, signal transmission / reception unit TRX1, operation unit OP, display unit DP, and device control unit ERC.

The ROM 11 is a storage area for programs and the like related to the flowcharts shown in FIGS.

The microprocessor MPU1 and the RO
M11 is a grouping of a plurality of terminal devices, the receiving unit simultaneously calls the terminal devices belonging to the group in order to detect disconnection, the called terminal device responds with a pulse, and the called terminal device is called simultaneously. This is an example of a means for setting the timings for responding to the receiving unit to be different from each other. When a plurality of terminal devices are divided into a plurality of groups, the microprocessor MPU1 and the ROM 11 make the timing of responding to the receiving unit different for each group, and the microprocessor MPU1 and the ROM 11 belong to one group so that the receiving unit detects disconnection. This is an example of means for simultaneously calling terminal equipments belonging thereto, responding with a pulse to the called terminal equipment, and setting different timings for responding to the receiving unit between the simultaneously called terminal equipments.

Further, the microprocessors MPU1 and R
OM11 is a normal system polling means for performing normal system polling, a normal point polling means for performing normal point polling, a selecting means for performing selection, a transmitter system polling means for performing transmitter system polling, and a transmitter point. It is an example of a transmitter point polling means for performing polling.

The ROM 12 has a transmitter P, a fire detector S,
This is a terminal device map table storage area that stores the addresses of the terminal devices such as the repeater RP and the types of the terminal devices in the initial setting state. The ROM 13 is a storage area of an interlocking control table for interlocking control of controlled devices such as smoke elimination devices ER based on a fire signal from a terminal device.

The RAM 11 is a work area. RAM
Reference numeral 13 stores the group number g of the group to which the transmitter P or a terminal device other than the transmitter P to which the response signal has been transmitted belongs based on the timing of receiving the pulse at the time of the system polling for the transmitter or the normal system polling. Area.

The RAM 14 stores the data at the time of disconnection determination polling.
Based on the timing at which the pulse was received, the address n of the terminal device that transmitted the response signal (that is, the number n obtained by adding the head address of the group to the number m in the group of the terminal device that transmitted the response signal) is stored. Area.
In addition, the RAM 14 stores the data at the time of the transmitter polling,
This area is for storing the number m in the group of terminal devices that transmitted the response signal based on the timing of receiving the pulse during the normal point polling.

The RAM 15 is a storage area for storing control contents to be executed in the transmitter system polling or the normal system polling. The RAM 16 is an area for storing a terminal device number to be controlled in the selecting and its control contents (for example, a test command, a fire determination command, a level stop command). The RAM 17 is a storage area for status information collected from each terminal device. RAM18
Is a storage area of the type (ID) of the terminal device actually connected.

In the RAM 19, when the disconnection determination polling is performed,
This area stores the group number L called by the fire receiver RE.

FIG. 4 is a block diagram showing the photoelectric smoke detector S in the above embodiment.

The photoelectric smoke detector S includes a microprocessor MPU2, RAM21 to RAM25, and ROM21 to RO.
M23, IF21 to IF24, signal transmitting / receiving unit TRX2,
A clock source CL, a light emitting diode LD for smoke detection,
It has a photodiode PD, a test lamp TL, and a light emitting diode LED as an operation confirmation lamp.

The ROM 21 is a storage area for programs and the like related to the flowcharts shown in FIGS.
The ROM 22 stores a self-address terminal number of the terminal device itself,
This is a storage area for the terminal device type ID and the like.
Is a storage area for various criteria for determining fire, failure, and the like. Note that a dip switch or the like may be used instead of the ROM 22.

The RAM 21 is a work area.
An area 22 stores current state information.
23 is an area for storing the status information sent to the receiver RE, and RAM 24 is an area for storing various flags.
The RAM 25 stores a terminal device group number g, a group number m, and a transmission address n required for transmission calculated from its own terminal device number at the time of initialization (S1) described later.
Storage area. The signal transmitting / receiving unit TRX2 is similar to the signal transmitting / receiving unit TRX1.

FIG. 5 shows the fire receiver R in the above embodiment.
6 is a flowchart showing a basic operation of E.

First, initial settings are made (S1), and a group number L for performing disconnection determination polling is set to "0" (S2). Then, prior to the normal system polling, system polling for the transmitter is performed (S
3) When there is a response from the transmitter P to the transmitter system polling (S4), transmitter point polling is performed for the responding group (S4).
5) When there is a response from the transmitter P to the transmitter point polling (S6), selecting is performed for the transmitter that has responded (S7), and when there is a control interrupt. Control interruption processing is performed (S8, S9),
The process returns to the transmitter system polling (S3).

On the other hand, if there is no response from the transmitter P when performing the system polling for the transmitter (S4), it means that none of the transmitters P is operating, and normal system polling is performed (S11). If there is a response from the terminal device P to the normal system polling (S1
2) Normal point polling is performed for the group that has responded (S13). When a response is received from the terminal device to the normal point polling (S14),
Selection is performed for the terminal device that has responded (S15), and the process proceeds to step S8.

When there is no response in the transmitter point polling and the normal point polling (S6, S1)
4) In system polling, it is determined that there is an erroneous response due to noise or the like, and disconnection determination polling is performed (S1).
6), and proceed to step S8. When there is no response in normal system polling (S12), disconnection determination polling is also performed (S16). The detailed operation of the disconnection determination polling will be described with reference to FIG.

FIG. 6 shows one of the terminal devices in the above embodiment.
3 is a flowchart showing a basic operation of the photoelectric smoke detector S, which is one of the two.

First, an initial setting is performed (S20), and the command received from the receiver RE does not have an address designation, and that part is a command SPAD indicating normal system polling.
If (S21, S22), system processing is performed (S21).
23) If a clock pulse is generated (S2
4) Perform sensor processing such as light emission and light reception (ie, smoke detection operation) (S25), and return to step S21. on the other hand,
If the command from the receiver RE is not the SPAD but the command GAD (g) of the point polling or the disconnection discrimination polling by designating the group to which the receiver RE belongs (S22, S26), the point processing such as sending the response pulse is performed. (S27), and if the signal from the receiver RE is not the command GAD (g) but the command SAD (n) indicating the selecting for designating its own address (S27).
28), a selecting process is performed (S29). In addition,
The detailed operation of the point processing will be described with reference to FIG.

FIG. 7 is a flowchart showing a specific example of disconnection determination polling (S16) in the fire receiver RE of the above embodiment.

The receiver RE reads the group number L stored in the RAM 19, substitutes the group number L for a variable g, and sends out a disconnection discrimination polling command GAD (g) .CM3 indicating a connection state information return command. (S5
1) The number m of the terminal device in the group is set to "0" (S52), and the number m in the group of the terminal device which did not respond in the disconnection determination polling is converted into the address n of the terminal device and stored. .

That is, when the response timing of the m-th terminal device has arrived and a pulse due to a response from the terminal device cannot be received (S53, S54), the variable m at that time is set to the head address of the group g. Is added to R as the address n of the terminal device that failed to respond.
AM 14 (S55), increments the variable m by 1 (S57), and until the variable m reaches a final value M (where M is the number of terminal devices belonging to one group).
The above operations S53 to S57 are repeated (S56). In addition,
When the response timing of the m-th terminal device has arrived and a pulse due to a response from the terminal device has been received (S53,
S54) Since the m-th terminal device is not disconnected, it is not necessary to store the address of the terminal device, and the variable m is incremented by 1 without storing the address (S5).
7).

When the variable m reaches the final value M (S56),
Since the disconnection monitoring has been completed for all the terminal devices belonging to one group, the address n of the terminal device that failed to respond stored in the RAM 14 is read, and the read address n of the terminal device is used as the connection abnormality information as R.
The information stored in the AM 17 and indicating that the terminal device at the address n has a connection error is transmitted to the display unit DP (S5).
8). Then, the variable L stored in the RAM 19 is set to 1
The value is incremented (S59). If the variable L has reached the maximum value of the set number of groups (S60), the variable L is initialized to 0 (S61), and the routine returns.

FIG. 8 shows a point process (S2) such as generation of a response pulse executed by the photoelectric smoke detector S in the above embodiment.
It is a flowchart which shows the specific example of 7).

The command received from the receiver RE is the disconnection discrimination polling or point polling code GAD (g) designating the group g to which the receiver RE belongs (S
26) If the status information return command CM2 requests status change information (S151), the current status information is stored in the RA.
The state information that has been read from M22 and has been transmitted is read from the RAM 23 (S152). If the two status information do not match, this means that the status of the photoelectric smoke detector S has changed, and at this time, the RAM 24 is referred to (S153,
If the response stop flag is not stored (S155), the state information in the RAM 22 may be sent to the receiver RE, and the number m of the photoelectric smoke detector S in the group is set to S. Read from RAM 25 (S1
56), and sets the slot number s to “0” (S15)
7).

When the slot number s matches the group number m (S158), the response pulse is output to the receiver R
E (S159) and responds to the receiver RE. If the slot number s does not match the group number m (S
158) When the transmission timing for the slot number s has timed out, the slot number s is incremented by 1 (S160, S161), and the slot number s is compared with the number g in the group (S158).

On the other hand, the command received from the receiver RE is
If the command is not the status information return command CM2 (S151) but the connection status return command CM3, the number m of the terminal device in the group to which the terminal device belongs is read from the RAM 25 (S156), and the slot number s is set to "0". When the slot number s and the group number m match (S158), it indicates that the terminal device is connected (indicating that no disconnection has occurred in the terminal device). ) A response pulse is sent to the receiver RE (S159), and by responding to the receiver RE, the terminal RE is notified that the terminal device is not disconnected. If the slot number s does not match the in-group number m (S158), the slot number s is set to 1 when the transmission timing for the slot number s has timed out.
The slot number is incremented (S160, S161), and the slot number s is compared with the number m in the group (S158).

The command received from the receiver RE is:
If it is not the connection state information return command CM3 (S16
2), and perform processing according to the command (S163).

FIG. 9 is a flowchart showing a specific example of the selecting process (S29) executed by the photoelectric smoke detector S in the above embodiment.

If the command received from the receiver RE is the command SAD (n) for specifying the address n of the fire detector S, and if the status information return command CM0 by selecting (S171), the terminal device address n To RAM2
5, data DA indicating the current state information (for example, two kinds of level signals which are fire signals when the smoke density is 10% / m) are read from the RAM 22, and the state change of the photoelectric smoke detector S is detected. Code SAD (n) · D shown
A is transmitted from the signal transmitting / receiving unit TRX2 (S172), and R
The transmitted data DA is stored in the AM 23 (S1).
73).

On the other hand, if the command received from the receiver RE is the fire determination command CM4 (S176), an ON signal is sent to the operation confirmation LED to turn on the LED (S177), and the subsequent status information is transmitted. Receiver RE for system polling and point polling based on
Is stored in the RAM 24 (S178). If the command received from the receiver RE is the command CM5 indicating a level stop command (S
179) The data DA of the state to be stopped (for example, one kind of level signal which is a fire signal when the smoke density is 5% / m) is read from the RAM 23, and only for that state, the system polling and the point polling are received. The level stop flag for stopping the response to the
It is stored in the AM 24 (S180).

If the command received from the receiver RE is the command CM8 indicating a remote test command (S181), the test flag is stored in the RAM 23 (S182), and the test process is performed (S183). If so, a process according to the command is performed (S162).

In the above embodiment, the fire receiver RE is described as an example of the receiving unit. However, if the repeater is assigned to monitor and control the terminal equipment, the repeater will The same operation as the operation is performed. Therefore, the repeater assigned to monitor and control the terminal device is an example of the receiving unit.

[0073]

According to the present invention, a plurality of terminal devices are connected to a receiving unit, different addresses are assigned to the respective terminal devices, and a fire alarm system for detecting disconnection between each terminal device and the receiving unit. In, the disconnection detection for a plurality of terminal devices is completed almost simultaneously, that is, the disconnection detection time for one terminal device can be shortened, and therefore,
Even if the calling order of the terminal device is late, the receiving unit can quickly detect the disconnection of the terminal device.

[Brief description of the drawings]

FIG. 1 is a time chart showing one embodiment of the present invention.

FIG. 2 is a wiring diagram of a fire alarm system to which the embodiment is applied.

FIG. 3 shows an example of a fire receiver RE in the embodiment,
It is a block diagram showing an example of a device connected to the receiver RE.

FIG. 4 is a block diagram showing a photoelectric smoke detector S in the embodiment.

FIG. 5 is a flowchart of a basic operation of the fire receiver RE in the embodiment.

FIG. 6 is a flowchart showing a basic operation of a photoelectric smoke detector S which is one of the terminal devices in the embodiment.

FIG. 7 is a flowchart illustrating a specific example of disconnection determination polling (S16) in the fire receiver RE of the embodiment.

FIG. 8 is a flowchart showing a specific example of point processing (S27) such as generation of a response pulse executed by the photoelectric smoke detector S in the embodiment.

FIG. 9 is a flowchart showing a specific example of a selecting process (S29) executed by the photoelectric smoke detector S in the embodiment.

[Explanation of symbols]

RE: Fire receiver, P: Transmitter, S: Fire detector, L1: Signal line, L2: Regional sound connection line, L3: Smoke prevention connection line, L4: Display connection line, OP: Operation unit, DP ... Display unit, ER ... Smoke control device, ERC ... Device control unit, SPAD ・ CM1 ... System polling command for transmitter, SPAD ・ CM2 ... Normal system polling command, GAD (g) ・ CM1 ... Sending group g GAD (g) .CM2... Normal point polling command for group g, GAD (n) .CM3... Disconnection discrimination polling command.

Claims (3)

(57) [Claims] 1. A fire alarm system in which a plurality of terminal devices are connected to a receiving unit, an address is assigned to each of the terminal devices, and a disconnection between each of the terminal devices and the receiving unit is detected. The terminal devices are grouped, and the receiving unit simultaneously calls the terminal devices belonging to the group in order to detect disconnection, the called terminal device responds with a pulse, and the reception device receives the reception signal between the simultaneously called terminal devices. A fire alarm system characterized by different timings for responding to the fire department. 2. The terminal device according to claim 1, wherein the plurality of terminal devices are divided into a plurality of groups, and a timing at which the receiving unit calls is different for each of the groups, and the receiving device determines terminal devices belonging to one of the groups. Fire alarm system characterized by calling simultaneously. 3. The terminal device according to claim 1, wherein the receiving unit calls the terminal device so that the receiving unit checks the terminal device whose state has changed, and the terminal device whose state has changed is the receiving unit. A fire alarm system that responds to a state change call from a group, wherein the timing of responding to the state change to the receiving unit differs for each of the groups, and the terminal device whose state has changed changes the response of the group to which the terminal device belongs. System polling means for performing system polling in response to the receiving unit at a timing; and in the system polling, the terminal device in a group to which the terminal device responding to the receiving unit belongs responds to the receiving unit. The terminal device, whose status has changed, responds to the receiving unit at the timing of responding to itself. Point polling means for performing point polling; and selecting means for calling the terminal device responding to the receiving unit in the point polling and performing selecting for the receiving unit to collect predetermined information from the terminal device. Fire alarm equipment.