JPH07262479A - Fire alarm equipment - Google Patents

Abstract

PURPOSE:To accurately measure response time from the sending of a signal from a fire receiver to a terminal equipment up to the reception of a response signal sent from the terminal equipment by measuring time from the detection of the reception of a polling signal outputted from a transmitting circuit in the receiver to a receiving circuit in the receiver up to the reception of a response signal outputted from each terminal equipment. CONSTITUTION:When an MPU 10 commands the sending of a system polling signal, a system polling signal corresponding to the command is outputted from a transmitting circuit 40, sent to respective terminal equipments through a signal line and received by a receiving circuit 50 in the receiver. When the MPU 10 detects the reception of the system poling signal through an interface 33, a timer (not shown in this circuit diagram) in the MPU 10 is started. Then time up to the detection of reception of a response signal outputted from each terminal equipment is measured. Consequently a delay clue to waveform shaping in the circuit is removed and the response time can be accurately measured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire alarm system for detecting a terminal device such as a fire detector, which is connected to a receiving section, is given an address to the terminal device, and has changed its state.

[0002]

2. Description of the Related Art A terminal device such as a fire detector is connected to a receiving portion such as a fire receiver, and an address is given to the terminal device.
In a fire alarm facility that detects a terminal device whose state has changed, for the purpose of promptly grasping the terminal device of which the state has changed, the receiving unit has been proposed.
Fire alarm equipment shown in No. 597 has been proposed.

In this conventional example, the terminal equipment is divided into a plurality of groups, and the timing at which the terminal equipment responds to the receiving section is made different for each group of the terminal equipment, so that the terminal equipment whose state has changed responds to the group to which it belongs. , The terminal device whose state has changed responds to the receiving unit (performs system polling), and then determines the timing of responding 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. Differently, the terminal device whose state has changed responds to the receiving unit at the response timing of itself (performs point polling), and the receiving unit collects specific information from the terminal device that responds to the receiving unit at this point polling (selecting). To do).

That is, as shown in FIG. 5, a fire detector S (smoke type, thermal type, flame type, gas type,
Various kinds of terminal devices such as odor type fire detectors), transmitters P, repeaters RP, etc. are connected, and different addresses are given to these terminal devices, and these terminal devices are, for example, four groups G0. , G1, G2, G3. Three fire detectors S and one transmitter P belong to the group G0, and three fire detectors S and one transmitter P belong to the group G1.
Two fire detectors S, one relay RP and one transmitter P belong to 2 and three fire detectors S and one transmitter P belong to group G3. The addresses of the respective terminal devices are sequentially address 0, address 1, address 2, ..., Address 15 from the first address of the group G0.
Is given. A plurality of ON / OFF type general sensors (having no address) that send out a fire signal due to a short circuit between wirings are connected to the repeater RP of address 10.

FIG. 6 is a time chart showing the operation when the state of the terminal equipment changes in the system polling and the point polling in the conventional example.

System polling is performed at P1, the state of the terminal equipment such as the fire detector S belonging to the group G2 changes, and point polling is performed at P2 in FIG. That is, at P1, the receiver RE1
A code SPAD-CM1 indicating a status information return command by system polling is sent, a pulse is returned at the third timing, and at P2, a status information return command GAD (g) .CM1 by point polling is sent to the terminal device of the group G2. (G is a number indicating a group, which is 2 in this case), and since the pulse is returned from the terminal device at the second timing, 2 of the 4 terminal devices belonging to group G2 Second terminal device (10
6) means that the state of the second terminal device) has changed.
In P3, the receiver RE1 selects the 10th terminal device (the terminal device having the address 9) and requests data. That is, the receiver RE1
The address of the terminal device that has received the response signal and the status information return command SAD (n) .CM0 (n is a number indicating the address, which is 9 in this case) are transmitted. On the other hand, the terminal device having the address 9 has the code SAD (n) .DA (in this case n
Is 9 and DA is the data to be sent) to the receiver RE1
Send to.

With the above arrangement, the operation for obtaining the predetermined information is executed only for the terminal device whose state has changed, and the operation for obtaining the predetermined information is not executed for the terminal device which does not change the state. It is possible to grasp the state change of the terminal device in a shorter time than in the case where the predetermined information is sequentially obtained for all of them.

[0008]

In the system polling in the above-mentioned conventional example, the timing for returning a pulse as a response signal is set accurately in advance for each of the four groups, as shown in FIG. Receiver R
For example, 30 ms have passed after E1 sends out the system polling signal SPAD / CM1, and then, for example, 1
During the slot (timing width) every 0 ms, the receiver RE1 monitors whether or not a pulse having a pulse width of about 900 μs is received. A photo coupler is provided in each of the transmission circuit and the reception circuit of the receiver RE1.

Strictly considering the above conventional example,
There is a time loss in the photocoupler in the transmission circuit of the receiver RE1, and the system polling signal SPAD / CM1 is sent to the receiver RE1 at a later timing than when the command to send the system polling signal SPAD / CM1 is issued.
The photo coupler in the receiving circuit of the receiver RE1 also has a time loss, and the receiver RE1 receives the response pulse at a later timing than when the terminal device sends the response pulse. Therefore, the response pulse is detected at a timing later than the actual timing. For this reason, if the slot is set to a short time width, the receiver RE1
In some cases, it may be erroneously recognized that a response pulse has been received in a slot different from the slot set within, and in this case, there is a problem in that the terminal device is erroneously recognized.

Further, when a large number of terminal devices are connected to the signal line and the line length is long, the waveform of the response pulse received from a distant terminal device is blunted. The timing is late,
Therefore, the response pulse is detected at a timing later than the actual timing. Therefore, the response pulse may be erroneously recognized as being received in a slot different from the slot set in the receiver RE1, and in this case, the terminal device may be erroneously recognized.

According to the present invention, a plurality of terminal devices are connected to a receiver such as a receiver, an address is given to each terminal device, and a fire alarm device for detecting a terminal device whose state has changed is used. It is an object of the present invention to provide a fire alarm system capable of accurately measuring a response time from when a polling signal is sent to a terminal device until when a response signal sent from the terminal device is received.

[0012]

According to the present invention, a plurality of terminal devices are connected to a receiver, an address is given to each of the terminal devices, and the fire alarm equipment for detecting the terminal device whose state has changed is received. The receiving circuit of the receiver receives the polling signal output by the transmitting circuit of the device, and measures the time from when this reception is detected to when it detects that the response signal output by each terminal device is received. The terminal device that responded or the terminal device group that responded is determined based on the measured time.

[0013]

According to the present invention, the polling signal output by the transmitter circuit of the receiver is received by the receiver circuit of the receiver, and the response signal output by each terminal device is received when the reception circuit detects the reception. The time until it is detected is measured, and the terminal device that responded or the terminal device group that responded is determined based on this measured time, so after the fire receiver sends a signal to the terminal device, It is possible to accurately measure the response time until the response signal sent by the device is received.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing a fire receiver RE which is an embodiment of the present invention.

The fire receiver RE stores an MPU (microprocessor) 10 that controls the entire fire receiver RE and an R that stores the programs of the flowcharts shown in FIGS.
OM11, terminal device map ROM12, interlocking control table ROM13, work area RAM21, system polling response number storage RAM22, point polling response number storage RAM23, state information storage RAM24, RAM 25 for disconnection monitoring and operation unit OP
This interface 31, the display unit DP, this interface 32, the transmission circuit 40, and the reception circuit 50.
And a voltage holding circuit 60, and an interface between the transmitting circuit 40 and the receiving circuit 50.

The signal line terminal T is a portion where the output terminal of the transmission circuit 40, the input terminal of the reception circuit 50 and the power supply / signal line L to each terminal device are connected.

The ROM 12 is a storage area for a terminal device map table that stores each address of the terminal device such as a fire detector, a transmitter, a repeater, and the type of the terminal device in the initial setting state, and the ROM 13 is a terminal. It is a storage area of an interlocking control table for interlocking control of a controlled device such as a smoke proof device ER based on a fire signal from the device.

The RAM 22 stores the data at the time of system polling.
The RAM 14 is an area for storing the group number g of the group to which the terminal device that has transmitted the response signal belongs, based on the timing of receiving the pulse. The RAM 14 transmits the response signal based on the timing of receiving the pulse during point polling. This is an area for storing the number m in the group of the terminal devices that have been deleted. The RAM 24 is a storage area for the status information collected from each terminal device, and the RAM 25 is an area for storing the address of the terminal device determined to be in the disconnection state by the disconnection monitoring selecting.

The power supply circuit 35 is a circuit for rectifying the AC voltage from the commercial power supply 36 connected to the fire receiver RE, and supplies the rectified voltage to the power supply of each terminal device via the signal line L. Circuit. In addition, the power supply circuit 35,
The circuit is a circuit that adjusts the voltage to a voltage required for the operation of the MPU 10 in each unit in the fire receiver RE and supplies the voltage. The two DC power sources output from the power circuit 35 are insulated from each other.

The transmitting circuit 40 shapes the waveform of the output signal of the photocoupler 40P and the photocoupler 40P that insulates the external power supply from the internal power supply in order to send the polling signal sent from the MPU 10 via the interface 33. And a waveform shaping circuit 41. The transmission circuit 40 is an example of a transmission circuit that transmits a polling signal to each terminal device.

The receiving circuit 50 is a waveform shaping circuit 5 for shaping the waveform of the signal received from each terminal device via the signal line L.
1 and a photocoupler 50P that insulates the external power supply from the internal power supply when receiving the output signal of the waveform shaping circuit 51.
And a waveform shaping circuit 52 that shapes the waveform of the output signal of the photocoupler 50P. The receiving circuit 50 is an example of a receiving circuit that receives the response signal output by each terminal device.

The voltage holding circuit 60 is a circuit that maintains a low signal of a high signal and a low signal transmitted through the signal line L at a predetermined voltage based on the switching operation of the transmitting circuit 40 and the receiving circuit 50. is there.

The MPU 10 and the ROM 11 measure the time from when the reception unit detects that the polling signal output from the transmission circuit is received to when the response signal output from each terminal device is detected. It is an example of the response time measuring means, and is also an example of the response terminal equipment or the like determining means for determining the responding terminal equipment or the responding terminal equipment group based on the measurement time measured by the response time measuring means.

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

FIG. 2 is a flow chart showing the operation of the above embodiment.

First, when the MPU 10 issues an instruction to send a system polling signal (S11), a system polling signal corresponding to this instruction is output from the transmission circuit 40, and the output system polling signal is output via the signal line L. Is sent to each terminal device and received by the receiving circuit 50 of the receiver RE. That is, since the output terminal of the transmission circuit 40 is connected to the input terminal of the reception circuit 50, the system polling signal output by the transmission circuit 40 is immediately input to the reception circuit 50.

Then, the receiving circuit 50 sends the system polling signal to the MPU 10 via the interface 33.
Then, the MPU 10 detects the reception of the system polling (S12). When the reception of the system polling signal by the receiving circuit 50 is detected, the MP (not shown)
The timer in U10 is started (S13). This timer is realized by the MPU 10 counting clock pulses, and the clock pulse has such a high frequency that the time until the response pulse is received can be measured.

After that, the system polling signal reaches each terminal device, and among the terminal devices that have received this system polling signal, the terminal device that has changed its state responds within its own response timing width (slot). Output pulse. When the MPU 10 detects that the receiving circuit 50 of the receiver RE has received the response pulse (S14),
The timer is stopped (S15), the MPU 10 grasps the time measured by the timer, and according to the measured time,
The MPU 10 determines which slot (timing width) the response pulse belongs to, and determines the terminal device group that responded (S16). After that, point polling is performed (S20).

On the other hand, in step S14, the receiver R
If the reception circuit 50 of E does not receive the response pulse, it is determined that none of the terminal devices has responded (S32) after a predetermined time corresponding to the time of one slot × the set number of slots has elapsed (S31). , Disconnection monitoring operation (S4
0).

In the above embodiment, the polling signal output from the transmitter circuit 40 of the receiver RE is immediately transmitted to the receiver RE.
The receiving circuit 50 receives the signal and measures the time from when the MPU 10 detects that the receiving circuit 50 has received the signal until it receives the response signal output by each terminal device. Based on the terminal device that responded,
Alternatively, since the responding terminal device group is determined, the response time from the fire receiver RE sending a signal to the terminal device until receiving the reply signal sent by the terminal device can be accurately measured.

FIG. 3 is a timing chart showing the signal delay in the above embodiment.

At time t1, MPU1 of the receiver RE
0 outputs the system polling signal (Fig. 3 (1)),
This transmission waveform is rounded by the photocoupler 40P in the transmission circuit 40 ((2) in the figure), and this rounded waveform is shaped and delayed by the waveform shaping circuit 41 in the transmission circuit 40, and the terminal T
Is transmitted to the signal line L ((3) in the same figure), the waveform is blunted by the impedance of the signal line L ((4) in the same figure), and the waveform is shaped and delayed in the receiving circuit of the terminal device ((5) in the same figure). )), The waveform is blunted by the photocoupler in the receiving circuit in the terminal device ((6) in the figure), and the blunted waveform is shaped by the waveform shaping circuit in the receiving circuit in the terminal device ((FIG. 7)). The rise of the pulse signal shaped by the waveform shaping circuit in the receiving circuit in the terminal device is time t2.

By the way, the system polling signal is set to MP.
When measuring the time after U10 outputs until the reception circuit 50 detects that the response pulse from the terminal device is received, the time t1 is conventionally used as the starting point of the measurement. In the embodiment, it becomes the same as the time t2. That is, the delay due to waveform shaping in the receiving circuit of the terminal device (FIG. 3 (5)) is operationally the same as the delay due to the waveform shaping circuit 51 of the receiving circuit 50 of the receiver RE. The blunting of the waveform by the photocoupler in the receiving circuit ((6) in the figure) is operationally the same as the blunting of the waveform by the photocoupler 50P in the receiving circuit 50 in the receiver RE. The shaping and delaying by the waveform shaping circuit in the receiving circuit in the device ((7) in the same figure) is also the same operation as the shaping and delaying by the waveform shaping circuit 52 in the receiving circuit 50 in the receiver RE. Is.

Therefore, in the above embodiment, the receiving circuit 5
0 has received the system polling signal at time t
2, the MPU 10 detects the time, and at this time t2, the measurement of the time until the reception of the response pulse is detected is started. When the time is measured in this way, the time from the time t1 when the MPU 10 of the receiver RE outputs the system polling signal to the time t2 when the MPU 10 detects that the receiving circuit 50 has received the system polling signal is excluded. Therefore, in the above embodiment,
It is possible to accurately measure the time until the response pulse reception is detected.

On the other hand, at time t3, the response pulse becomes
It is input to the transmission circuit of the terminal device (Fig. 3 (8)), the waveform is blunted by the photocoupler in the transmission circuit of the terminal device (Fig. 9 (9)), and this waveform is shaped and delayed (Fig. 10)), the waveform is blunted by the impedance of the signal line L ((11) in the figure), and the waveform is shaped by the waveform shaping circuit 51 in the receiving circuit 50 of the receiver RE ((1) in the figure).
2)), the waveform is blunted by the photocoupler 50P in the receiving circuit 50 ((13) in the figure), and the waveform is shaped and delayed by the waveform shaping circuit 52 ((1) in the figure).
4)). In this way, the time when the response pulse is output from the receiving circuit 50 is t4.

In the above embodiment, the time from the time t2 to the time t4 is measured as the time until the response pulse is received,
In the conventional example, the time from the time t1 to the time t4 is measured as the time until the response pulse is received, and the delay time included in the measurement time of the above embodiment is shorter. Therefore, in the above embodiment, the response timing can be measured more accurately. Therefore, the time for one slot can be set short, and many slots can be set within a predetermined time.

FIG. 4 is a flow chart showing the operation of another embodiment of the present invention.

In this embodiment, in the flow chart shown in FIG. 2, the system polling signal is immediately received by the receiving circuit 50.
Instead of starting the timer from when
The timer is started when the MPU 10 issues a system polling signal transmission command, and from the measured time,
Calculate the difference time by subtracting the standardized delay prediction time,
The response group is determined according to the obtained difference time.

That is, in FIG. 4, when the MPU 10 commands the transmission of the system polling signal (S11), the timer is immediately started (S11a), and then the response pulse in response to the system polling signal is sent from the terminal device. When the MPU 10 detects that the receiving circuit 50 of the receiver RE has received the response pulse (S1
4) The timer is stopped (S15), and the MPU 10 performs a calculation of subtracting the estimated delay time from the time measured by the timer, whereby the difference time is calculated, and the response pulse is generated according to the difference time. The MPU 10 determines which slot (timing width) it belongs to, and determines the terminal device group that responded (S16a).

Even in this case, the delay time included in the measurement time is shortened, so that the response timing can be measured more accurately. Therefore, the time for one slot can be set short, and many slots can be set within a predetermined time.

After that, point polling is performed (S2
0). Also in this point polling, the same operations (S11 to S16a) as described above are executed.

Among the delay times in the transmission circuit 40, the delay time in the signal line L connecting the transmission circuit 40 and each terminal device, the delay time in each terminal device, and the delay time in the receiving circuit 50, the delay prediction time is It is sufficient if at least one is predicted.

In the flow chart shown in FIG. 4, M
The PU 10 and the ROM 11 are an example of polling signal transmission command means for instructing each terminal device to transmit a polling signal, and the receiving circuit has been operated by each reception circuit from the time when the transmission command means issues a polling signal. It is an example of a response time measuring means for measuring the time until the reception of the response signal of the device is detected. In addition, MPU10 and RO
M11 denotes a signal in at least one of the transmitting circuit, the signal line connecting the transmitting circuit and the terminal device, the terminal device, the signal line connecting the terminal device and the receiving circuit, and the receiving circuit. Predict the delay time,
A difference time calculating means for calculating a difference time by subtracting from the measurement time, and a terminal device that responds based on the difference time,
It is also an example of a response terminal device determining unit that determines the terminal device group that has responded.

Further, the time at which the signal is delayed is predicted in the terminal device, the delay predicted time in this terminal device is subtracted from the measurement time in the operation of the flowchart shown in FIG. 2 to calculate the difference time, and this is calculated. The responding terminal device or the responding terminal device group may be determined based on the difference time.

Further, the delay time from when the polling signal sending command means sends the polling signal to when the receiving circuit 50 detects that the polling signal is received is actually measured, while the sending command means polls. The time from when the command to send the signal is issued to when the receiving circuit 50 of the receiver RE detects that the response signal of each terminal device is received is measured, and the measured delay time is subtracted from the measured time. Then, the difference time may be calculated, and the responding terminal device or the responding terminal device group may be determined based on the difference time.

In each of the above embodiments, when the system polling is executed, an attempt is made to eliminate the delay of the time for receiving the response signal. However, in the point polling, the time for receiving the response signal is as described above. May be eliminated.

Also, without system polling,
The terminal device that responded may be determined by executing only point polling, and in this case, the delay of the time for receiving the response signal may be removed as described above. That is, also in the point polling, the same operation as in steps S11 to S16 or S11 to S16a
May be executed.

In the above-mentioned "system polling", the terminal devices are divided into a plurality of groups in advance and the terminal device whose state has changed is not specified, but only whether or not there is a terminal device whose state has changed. , The polling is performed for each group, that is, the timing of responding to the receiver RE is made different for each group of terminal devices, and the terminal whose state has changed at the response timing assigned to the group to which the terminal device whose state has changed This is polling in which a device responds to the receiver RE (for example, responds by sending out a pulse), and the above-mentioned "point polling" is polling for identifying a terminal device that responded to system polling (that is, identifying a terminal device in which a state change has occurred). Which belongs to the group that responded to the receiver RE during system polling. Receiver RE calls a terminal equipment,
Each terminal device in the group has a different timing for responding to the receiver RE (for example, different timing for responding by sending a pulse), and the terminal device whose state has changed responds to the receiver RE assigned to itself. Polling in response to the receiver RE (eg, responding by sending out a pulse) at a timing.

In the embodiment, the number of terminal devices in one group is four, but the number of terminal devices in one group may be set to a number other than four.
Although the number of groups is four, it may be set to a number other than four.

[0050]

According to the present invention, a plurality of terminal devices are connected to a receiving unit, an address is given to each terminal device, and a fire receiver for detecting a terminal device whose state has changed is used as a fire receiver. It is possible to accurately measure the response time from when a signal is sent to the terminal device to when the response signal sent by the terminal device is received.

[Brief description of drawings]

FIG. 1 is a block diagram showing a fire receiver RE which is an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the above embodiment.

FIG. 3 is a timing chart illustrating a signal delay in the above embodiment.

FIG. 4 is a flowchart showing the operation of another embodiment of the present invention.

FIG. 5 is a block diagram showing a conventional fire alarm system.

FIG. 6 is a time chart showing an operation when the state of the terminal device changes in the system polling and the point polling in the conventional example.

FIG. 7 is an explanatory diagram of a transmission frame in the conventional example.

[Explanation of symbols]

 RE ... receiver as receiving unit, 10 ... MPU, 11 ... program ROM, 35 ... power supply circuit, 36 ... commercial power supply, 40 ... transmission circuit, 41 ... waveform shaping circuit, 40P ... photocoupler, 50 ... reception circuit, 51, 52 ... Waveform shaping circuit, 50P ... Photo coupler, L ... Signal line.

Claims (7)

[Claims] 1. A fire alarm facility for detecting a terminal device in which a plurality of terminal devices are connected to a receiving unit, an address is given to each of the terminal devices, and the status has changed, and a polling signal is sent to each of the terminal devices. A transmitting circuit for transmitting a response signal output from each of the terminal devices; and a receiving circuit that receives the polling signal output by the transmitting circuit from the receiving circuit A response time measuring means for measuring the time until the reception of the response signal output by the device is detected; a response terminal device or a response terminal device group is determined based on the measurement time measured by the response time measuring means. A fire alarm facility characterized by having a determining means such as a response terminal device for determining. 2. The difference time calculating means according to claim 1, further comprising: a time difference calculating means for predicting a time delay of the signal in the terminal device and subtracting the predicted time from the measurement time to calculate a time difference. The fire alarm facility is characterized in that the response terminal device etc. discriminating means is a means for discriminating a responding terminal device or a responding terminal device group based on the calculated time difference. 3. A fire alarm facility for detecting a terminal device in which a plurality of terminal devices are connected to a receiving unit, an address is given to each of the terminal devices, and the state has changed, and a polling signal is sent to each of the terminal devices. A polling signal sending command means for sending a polling signal; a sending circuit for sending a polling signal to each terminal device; a receiving circuit for receiving a response signal output by each terminal device; Response time measuring means for measuring a time from when the polling signal is sent out to when the receiving circuit detects that the response signal of each terminal device is received; the transmitting circuit, and the transmitting circuit And a signal line connecting the terminal device, the terminal device, a signal line connecting the terminal device and the receiving circuit, and at least the receiving circuit. A difference time calculating means for predicting a signal delay time in one and subtracting the predicted time from the measurement time measured by the response time measuring means to calculate a difference time; based on the difference time And a responding terminal device or the like determining means for determining a responding terminal device or a responding terminal device group. 4. A fire alarm facility for detecting a terminal device in which a plurality of terminal devices are connected to a receiving unit, an address is given to each of the terminal devices, and the status has changed, and a polling signal is sent to each of the terminal devices. A polling signal sending command means for sending the polling signal; a sending circuit for sending the polling signal to each terminal device; a receiving circuit for receiving a response signal output by each terminal device; and the sending command means Response time measuring means for measuring a time from when the polling signal is commanded to be sent to when the receiving circuit detects that the response signal of each terminal device is received; and the polling signal sending command means Delay time for measuring the delay time from when the polling signal is sent to when the receiving unit detects that the polling signal has been received Measuring means; difference time calculating means for calculating the difference time by subtracting the delay time measured by the delay time measuring means from the measurement time measured by the response time measuring means; and the difference time And a responding terminal device determining unit that determines a responding terminal device or a responding terminal device group based on the above. 5. The device according to claim 1, wherein the plurality of terminal devices are divided into a plurality of groups, and the timing of responding to the receiving unit is different for each group,
At the response timing of the group to which the terminal device whose status has changed, the terminal device whose status has changed performs system polling in response to the receiving unit, and the responding terminal device etc. determination means responds to the system polling. Fire alarm equipment characterized by distinguishing a group of terminal devices that have fired. 6. The terminal device according to claim 1, wherein the plurality of terminal devices are divided into a plurality of groups, and a timing of responding to the receiving unit is different for each group,
At the response timing of the group to which the terminal device whose status has changed, the terminal device whose status has changed performs system polling in response to the receiving unit, and the terminal which responds to the receiving unit in this system polling. The terminal devices in the group to which the devices belong have different timings for responding to the receiving unit for each of the terminal devices, and the terminal device whose state has changed performs point polling for responding at its own response timing,
The fire alarm equipment, wherein the response terminal device etc. discriminating means discriminates the terminal device responding to the point polling. 7. The terminal device according to claim 1, wherein a timing at which the plurality of terminal devices responds to the receiving unit is different for each terminal device, and the terminal device having a changed state responds to itself. A fire alarm facility characterized by performing point polling that responds at a timing, and the response terminal device etc. determination means determines the terminal device that responded to the point polling.