JPH03201194A - Radio type alarm system - Google Patents

Abstract

PURPOSE:To attain a simple propagation test by driving a test switch fixed to a slave, transmitting a test signal to a master together with an individual address signal and allowing the master to display an alarm by the received test signal but to inhibit the transfer of the alarm to a receiver. CONSTITUTION:The system is provided with plural slaves 12 each of which transmits an abnormal signal from a sensor 10 for detecting abnormality such as a fire together with its self-address signal through a radio wave and the master 14 for receiving and decoding the transmitted wave, individually displaying an alarm and transferring the alarm signal to the receiver 100. Each slave 12 is provided with the test switch 16 ad a test transmitting means for transmitting a test signal together with the self-address signal to the master 16 at the time of driving the switch 16. On the other hand, the master 14 is provided with the means for inhibiting the transfer of an alarm signal to the receiver 100 at the time of receiving a test signal from the slave 12. Since the slave side operation for a propagation test from the slave 12 to the master 14 can be simplified and the master side operation due to the test can be omitted, the propagation test can be simply and easily executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wireless alarm system for monitoring abnormalities such as fire.

[Prior art] Conventionally, in order to monitor fires at construction sites such as buildings, one or more slave units to which a fire detector is directly attached externally are installed on the ceiling side of a warning area, and a fire signal is obtained from the fire detector. When an abnormality detection signal is received, an abnormality detection signal is sent to the main device to notify the abnormality, and the main device is connected to a receiver such as a fire alarm equipment via a transmission line, and when the abnormality detection signal is received, the main device is activated. A wireless alarm system has been proposed in which a warning can be issued on the receiver side by transmitting a message from the receiver. The slave unit has a built-in battery power supply, and can be freely installed in any desired location.

[Means for solving the problem] By the way, in such a conventional wireless alarm system, depending on the installation location of the backup, the radio waves transmitted from the backup may become so weak that the main device cannot receive them normally. There is.

Therefore, a radio wave propagation test is being conducted to test whether smoke or the like is caused to flow into a fire detector set up in reserve to issue a test alarm, and to confirm whether or not the main device can properly receive the alarm.

However, the operation to cause the detector to issue a test alarm by injecting smoke, etc. is complicated, and even when issuing a test alarm, the alarm signal is transferred to the receiver as the alarm operates on the parent device. In order to receive the alarm, the alarm operation on the receiver side must be canceled, which poses the problem of complicating the radio wave propagation test of the wireless alarm system.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a wireless alarm system that can simply and easily conduct a radio wave propagation test from a standby unit to a master unit.

[Means for Solving the Problems] To achieve this object, the present invention is configured as follows. In addition, the reference numerals of the drawings of the embodiments are also indicated.

First, the present invention includes a sensor 10 for detecting an abnormality such as a fire,
A reserve 12 wirelessly transmits the abnormal signal from the sensor 10 together with its own address signal, and a reserve 12 that receives and decodes the radio waves transmitted from the reserve 12 and individually displays an alarm of the abnormal state based on the address signal, and transmits the error signal via the transmission line. The present invention is directed to a wireless alarm system equipped with a main device 14 that transmits an alarm signal to a receiver 100.

In the present invention for such a wireless alarm system, the preliminary device 12 includes a test switch 16 for performing a radio wave transmission test, and when the test switch 16 is activated, the main device 1
4 is provided with test transmitting means 18 for transmitting a test signal together with its own address signal;
A signal transfer prohibiting means 20 is provided which prohibits transfer of information to the receiver 100 when a test signal from the backup 12 is received.

[Function] According to the wireless alarm system of the present invention having such a configuration, when the test switch 16 provided in the reserve 12 is activated, a test signal is transmitted to the master unit 14 together with the individual address signal of the reserve 12. The main device 14 displays an alarm using the test signal when it receives the test signal, but the receiver 100
This simplifies the test operation on the backup side, eliminates the need for operations such as canceling the receiver alarm associated with the friendly side test, and allows the radio wave propagation test from the backup to be easily performed.

[Embodiment] FIG. 1 is a system configuration diagram showing the overall configuration of the present invention.

In FIG. 1, 12-1.12-2. ...12
-n is a spare installed on the ceiling of the warning area, and a fire detector 10 is removably attached to the lower part of each of them. When the spares 12-1 to 12-n receive a fire detection signal from the fire detector 10, they transmit the fire detection signal to the master device 14 from the antenna 22 together with their own pre-allocated address signal. Here, spare 12-1 to 12-n
Six transmission channels CHI to CH6 are assigned to the , and before transmission, it first performs carrier sense of the channel to be transmitted in the receiving state, and if there is no carrier, switches to the transmitting state and sends the fire detection signal to the address. Send along with the signal. On the other hand, when carrier sense detects that another spare channel is in use, it switches to carrier sense for the next channel CH2, and continues channel switching until it finds an empty channel.

The main unit 14 receives and decodes the transmitted radio waves transmitted from any of the spares 12-1 to 12-n, and displays an individual alarm on the true state based on the address signal. It is connected to a receiver 100 of fire alarm equipment, etc., and transmits the alarm signal to the receiver 100 via the transmission line 102 along with an alarm display based on reception and decoding of the transmitted radio waves from the slave device, and also transmits the alarm signal to the receiver 100 via the transmission line 102. It is possible to display a warning.

In the present invention, such a wireless alarm system is provided with a test switch 16 for performing a radio wave transmission test on each of the child devices 12-1 to 12-n. In this embodiment, the test switch 16 is a switch that is built into the slave housing and is activated by receiving external magnetism, and when a magnet is brought close to the slave housing during a test, the test switch 16 is turned on. Further, the child devices 12-1 to 12-n are provided with a function as a test transmitting means for transmitting a test signal to the goodwill 14 together with its own address signal when the test switch 16 is activated.

On the other hand, when Goodwill 14 receives a test signal sent from the slave device side, it sounds the fire indicator light and alarm buzzer based on the received slave device address, but prohibits the transfer of the alarm signal to receiver 100. A function is provided as a transfer prohibition means.

FIG. 2 is an embodiment configuration diagram showing an embodiment of the child device of the present invention.

In FIG. 2, the child device 12 is provided with a CPU 24,
The transmission control section 26 and the test transmission section 1 are controlled by the program.
8 functions are realized.

28 is a fire receiving circuit to which the fire detector 10 is connected;
When the fire detector 10 generates an alarm, the fire reception output is sent to the CPU 24.
and output to the starting circuit 30. A heat detector or a smoke detector is connected as a fire detector, and a predetermined voltage is applied via a power signal line 110. The starting circuit 30 that has received the fire reception output controls the power supply control circuit 32, supplies power to the CPU 24 from the battery power supply 25, powers on the CPU 24, and, based on the fire reception output at that time, causes the transmission control unit 26 to self-start. Performs a transmission operation to send a fire detection signal to goodwill along with the address.

Further, for the CPU 24, an address setting circuit 34 and a nonvolatile memory 35 using an EEPROM are provided. The address setting circuit 34 sets a group address (lower order) in which one friendly device and a plurality of slave devices form one group, and a predetermined individual address for each slave device. Non-volatile memory 35
A call identification signal (ID code) approved by the Minister of Posts and Telecommunications and an upper group address for extending the group address are stored in the , and the call identification signal read out from the non-volatile memory 35 is first transmitted at the time of transmission. . That is, specified low power radio stations stipulated by the Radio Law are required to first transmit a call identification signal (ID code) during radio transmission.

It goes without saying that an appropriate transmission format can be adopted for other wireless systems such as weak radio waves.

Furthermore, 36 is a periodic reporting circuit, for example, 9 is set by a timer.
Start circuit 30 and CPU 2 to output regular report once every hour.
4, the power-on start of the CPU 24 by the operation of the power supply control circuit 32 causes the transmission control section 26 to operate, and the power supply control circuit 32 operates.
Periodic report transmission operation is performed.

Furthermore, in the present invention, the test circuit 3 is connected to the CPU 24.
A test switch 16 is provided through the test switch 7, and the test switch 16 is, for example, a reed switch built into the slave housing as shown in FIG. This turns on the test output from the test circuit 37 and sends it to the fire receiving circuit 28.
and output to the CPU 24. The fire reception circuit 28 that receives the test output from the test circuit 37 generates a reception output to the startup circuit 30, operates the power supply control circuit 32, and starts the test by powering on the CPU 24, in the same way as when the fire detector 10 is activated. In transmission operation 8, a test transmission operation is performed.

A transmitting/receiving circuit section is provided on the left side of the CPU 24.

In this transmitting/receiving circuit section, 40 is a synthesizer circuit, a PLL circuit 42, a VCO (voltage controlled oscillator) 4
4 and an amplifier 46. The oscillation frequency of the vc044 can be freely changed by setting frequency division ratio data to the PLL circuit 42 from the CPU 24. The synthesizer circuit 40 oscillates a local oscillation frequency on the receiving side during carrier sense prior to transmission, and when a transmission channel is selected in carrier sense, oscillates the carrier frequency of the transmission channel.

The output of the synthesizer circuit 40 is sent via a signal switch 48 to a transmitting circuit 50 or a high frequency amplification/mixing circuit 5 on the receiving side.
given to 4. The output of the transmitting circuit 50 is given to the antenna 22 via an antenna switch 52. The other side of the antenna switch 52 is input to a high frequency amplification/mixing circuit 54 on the receiving side. The high frequency amplification/mixing circuit 54 receives the received signal and the local oscillation frequency fr given from the synthesizer circuit 40.
Frequency conversion is performed by mixing with the intermediate frequency f1 signal, and the intermediate frequency f1 signal is output to the intermediate frequency amplification/mixing circuit 56.

Here, the child device can transmit using 6 channels in the 429 MHz band. For example, taking channel CH1 as an example, the carrier frequency f for the transmitting circuit 50 = 429
．． 175MHz, and the intermediate frequency fl is 21.7MHz
Then, the local oscillation frequency ftl for the high frequency amplification/mixing circuit 54 during carrier sensing of channel CH1 is 4.
It becomes 07.475MHz.

The intermediate frequency amplification/mixing circuit 56 is the high frequency amplification/mixing circuit 5
The 21.7 MHz intermediate frequency signal obtained from 4 is frequency converted to a 455 KHz intermediate signal using a fixed local oscillator. This two-time frequency conversion method using the high frequency amplification/mixing circuit 54 and the intermediate frequency amplification/mixing circuit 56 is known as a double superhetero gain method.

The carrier detection circuit 58 has a threshold value based on the white noise level when there is no carrier, and provides a carrier detection output to the CPU 24 that indicates that a carrier is present when the threshold is exceeded, and that there is no carrier when the carrier is below the threshold.

60 is an MSK modem, and intermediate frequency amplification/mixing circuit 5
The received frequency signal from CPU 24 is converted into data bits 1.0, and the data bits 1,0 from CPU 24 are converted into two different frequency signals.

For example, data bit 1 corresponds to 1200 Hz, and data bit 0 corresponds to 1800 Hz. MSK modem 6 modulates the data bits output from CPU 24 during transmission.
0 means data bit 1. v of the synthesizer circuit 40 by converting it to a frequency of 1200 or 1800 Hz corresponding to o.
By giving it to CO as a control signal, MSK modulation of the carrier frequency at that time is performed.

Furthermore, 62 is a power switching circuit, which controls on/off the power supply to the receiving circuit section and the transmitting circuit section under the control of the CPU 24. That is, the power supply to the receiving circuit section is turned on during the first carrier sense, and after the receiving circuit section is turned off during the next transmission, the power supply to the transmitting circuit section is turned on. That is, in this embodiment, the receiving mode and the transmitting mode are switched by turning on and off the power supply to the receiving circuit section and the transmitting circuit section.

Therefore, the signal switch 48 and the antenna switch 52 are switched to enable the circuit section that is activated by power supply.

FIG. 3 is a timing chart of the continuous transmission operation when the fire detector in FIG. 2 is activated.

As is clear from Fig. 3, first, in the reception state, an empty channel is selected by carrier sense, then in the transmission state, after a transmission operation is performed for a transmission period of T1 = 8 seconds, there is a rest period of T2 = 2 seconds. and repeat this. The call identification code is transmitted at the beginning of the transmission period of T1=8 seconds. This call identification code is stored in the nonvolatile memory 35, and is read out when the CPU 24 is powered on to create the transmission format shown in FIG. 4 and transmit the call identification code.

When the transmission of the call identification code is completed, the transmission of the mark and transmission data is repeated alternately. The mark is data with consecutive 1 bits, and the transmission code includes address and detection information. For example, as shown in FIG.
Consists of frames. In FIG. 5, frames 1 to
4, the first start bit O and the last start bit 1
is used for frame synchronization, the 8 bits following the start bit are used as a data area, frame 1 stores the group address (upper), and frame 2 stores the individual address and group address (lower). Frame 3 incorporates an alarm or test signal, and frame 4 incorporates a horizontal parity bit.

The horizontal parity bit of frame 4 is set so that the sum of the same bit positions of frames 1 to 3 is, for example, an odd number. Following the 8-bit data area, a parity bit is provided for performing a parity check for each frame.

FIG. 6 is a block diagram showing an embodiment of the parent device of the present invention together with a receiver.

In FIG. 6, the master device 14 is provided with a CPU 64,
The reception control unit 66 is configured under program control. C
An antenna 68, a receiving circuit 70, a synthesizer circuit 72, an MSK modem 74, and an address setting circuit 76 are provided on the left side of the PU 64.

In the steady monitoring state, the reception control unit 66 of the CPU 64 sequentially sets division ratio data for carrier sensing of six channels CH1 to CH6 to the synthesizer circuit 72, and monitors the carrier sense output from the reception circuit 70. . When a carrier sense output is obtained in an arbitrary channel selection state, the oscillation state of the synthesizer circuit 72 is fixed, and the received signal from the receiving circuit 70 is demodulated into data bits 0 and 1 by the MSK modem 74 and taken into the CPU 64.

Processing of the received data taken in by the CPU 64 begins with checking whether the received address and the address set by the address setting circuit 76 match. If they match, the data area is decoded, and if a fire detection signal is determined, the display circuit 78 The fire indicator light 80 is turned on via the address indicator 8.
2 displays the slave device address, and also sounds the alarm buzzer shown. In addition, the transmission line 102 is activated by operating the transmission circuit 84.
The alarm signal is transmitted to the receiver 100 via the receiver 100.

In the present invention, for such a master device 14, a signal transfer prohibition circuit 20 is newly provided, and when the CPU 64 decodes the test signal from the received signal of the slave device, the signal transfer prohibition circuit 20 is activated. The function of the alarm circuit 84 is stopped, and transfer of the alarm signal to the receiver 100 upon reception of the test signal is prohibited, and only the fire indicator light 80 is turned on in the master unit 14 and the slave unit address is displayed on the address display 82. I try to do this.

Next, the test transmission operation when the test switch 16 provided in the child device of FIG. 2 is activated will be described with reference to the operation flowchart of FIG. 7.

Test switch 1 can be set by bringing the magnet close to the slave case.
6 is turned on, the CPU 2 is turned on via the test circuit 37.
4 and the fire receiving circuit 28, and the fire receiving circuit 28 receives the starting circuit 30 and the C
Generates a fire reception output to PU24. Therefore, the startup circuit 30 turns on the power supply control circuit 32, and the battery power supply 25
Power is supplied to the CPU 24, and the operation flow shown in FIG. 7 is executed by power-on start of the CPU 24.

In FIG. 7, initialization processing is first performed at step Sl (hereinafter "step" is omitted), and then at 82 the test board from the test circuit 37 is read and stored, and at this time a test output is obtained. It is recognized that a test operation has been carried out.

Next, the process advances to step 83, where the call identification signal and the group address (upper) are read from the nonvolatile memory 35, and the group address (lower) and individual address are read from the address setting circuit 34, and furthermore, the data set randomly for each child device in advance is read. Set the delay time.

Next, in step 84, the channel CHI is sent to the PLL circuit 42 for carrier sensing of the channel CHI to be transmitted.
Set the division ratio data that oscillates the local oscillation frequency of I. Next, in S5, the power supply to the receiving circuit section is turned on to bring it into an operating state.1. If the power is turned on for the first receiving circuit after the power-on start in S6, proceed to S7 and set 300.
After waiting for ms and stabilizing the receiving operation, the process proceeds to step S8 to determine carrier detection. If there is no carrier detection in S8, S1
Proceed to S8. By repeating the processing in S11, the delay time is waited for to elapse, and when the delay time has elapsed, the reception circuit section is turned off in step 812, and frequency division ratio data is sent to the PLL circuit 42 so as to oscillate the carrier frequency of the selected channel CHI. Then, in S13, the power supply to the transmitting circuit section is turned on to bring it into operation.

Next, at 814, the call identification code is first transmitted, and then at 815, the mark and transmission code are transmitted. When transmitting this transmission code, a test signal is set in the data area of frame 3 in FIG. 5 based on the test output read and stored in S2, and is transmitted instead of the alarm signal. Next, in 816, the transmission number counter A is incremented, and in S17, the transmission code including the mark and test signal of 815 is repeatedly transmitted until the number of transmissions reaches a predetermined number n1, for example, 75 times.
After a 2-second pause by the timer in S18, it is checked in S19 whether or not a fire signal is being received.

At this time, if the test switch 16 is maintained in the on state by the magnet, the process returns to S3 and the same test signal transmission operation is repeated. On the other hand, if the test switch 16 has already been deactivated, the process proceeds to 820, where the CPU 24 performs power-off control on the startup circuit 30, cuts off the power supply to the CPU 24, and ends the transmission operation.

On the other hand, if the carrier of channel CHI is obtained by the carrier detection in S8, it is determined in S9 whether the carrier detection continues for a predetermined period of time, and when it is determined that the carrier detection continues for a predetermined period of time, the process proceeds to SIO and the next step is performed. Reception channel CH2
PLL splitting ratio data for carrier sensing of
The circuit 42 is set, and carrier sensing is repeated in the same manner.Then, carrier sensing is repeated until an empty channel is obtained.

Regarding the transmission operation of the test signal on the child unit side shown in Fig. 7,
On the master device 14 side shown in FIG.
The slave device address is displayed on the screen and an alarm buzzer is sounded, but at the same time, the transfer prohibition circuit 20 is activated to stop the function of the transfer circuit 84, thereby prohibiting transfer of the alarm signal to the receiver 100.

On the other hand, the transmission operation of the slave device when the fire detector 10 is activated is exactly the same as when transmitting the test signal, except that the transmission code transmitted at 815 in FIG. 7 becomes an alarm signal.

In addition, although the above-mentioned example was provided with a test switch 16 that is turned on by bringing a magnet close to the child device, other suitable tests such as a push button switch, a pull string switch, etc. It may also be a switch. In addition, although the above embodiment takes as an example the case where a fire detector is attached to the slave unit, other appropriate abnormality detectors such as a gas leak detector or an intruder detector may also be attached. Good too.

[Effects of the Invention] As explained above, according to the present invention, when the test switch provided in the slave unit is activated, a test signal is transmitted to the master unit along with the individual address signal of the slave unit, and the master unit transmits the test signal. When a signal is received, an alarm is displayed using a test signal, but
Transmission to the receiver is now prohibited, making test operations on the slave side easier during propagation tests from the slave unit to the master unit, and operations such as canceling receiver alarms during tests on the master side. This makes it possible to easily and easily conduct a propagation test from the child device.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram of the present invention; FIG. 2 is a configuration diagram of an embodiment of the slave unit of the present invention; Figure 3 is a transmission timing chart of the slave unit of the present invention; Figure 4 is from the slave unit of the present invention. Figure 5 is a format diagram of the transmission code transmitted from the child unit of the present invention; Figure 6 is a diagram of the configuration of an embodiment of the master unit of the present invention; FIG. 3 is an operation flow diagram showing a test signal transmission operation of the child device of the invention. In the figure, 10: Fire detector 12.12-1 to 12-n: Child device 14: Main device 16: Test switch 18: Test transmitter (means) 20: Transfer prohibition circuit (means) 22.68: Antenna 24.64: CPU 25: Battery power supply 26: Transmission control unit 28: Fire reception circuit 30: Starting circuit 32: Power supply control circuit 34.76: Address setting circuit 36: Regular notification circuit 40.72: Synthesizer circuit 42: PLL 44 :VCO 46: Amplifier 48: Signal switch 50: Transmission circuit 52: Antenna switch 54: High frequency amplification/mixing circuit 56: Intermediate frequency amplification/mixing circuit 58: Carrier detection circuit 60.74: MSK modem 62: Power supply switching circuit 70: Receiving circuit 78: Display circuit 80: Fire indicator light 82 Near address indicator 84: Transfer circuit 100: Receiver 102: Transmission line

Claims (1)

[Claims] 1. A sensor that detects an abnormality such as a fire, a slave device that wirelessly transmits the abnormal signal from the detector together with its own address signal, and a slave device that receives and decodes the radio waves transmitted from the slave device. In a wireless alarm system, the slave device is equipped with a master device that individually displays an alarm for abnormal conditions based on an address signal and transmits the alarm signal to a receiver via a transmission line. A test switch for performing a transmission test, and test transmitting means for transmitting a test signal together with its own address signal to the parent device when the test switch is activated, the parent device receiving the test signal from the child device. 1. A wireless alarm system, characterized in that a radio alarm system is provided with a transfer prohibition means for prohibiting transfer of a message to the receiver when a signal is received.