JP2840344B2 - Wireless alarm system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a wireless alarm system for monitoring an abnormality such as a fire.

[Prior art] Conventionally, for monitoring a fire at a building site such as a building, one or more slave units having a fire detector directly attached thereto are installed on the ceiling side of a guard area, and a fire signal is obtained from the fire detector. When an abnormality is detected, the abnormality detection signal is transmitted to the master unit by radio to notify the abnormality, and the master unit is connected to a receiver such as a fire alarm system via a transmission line. There has been proposed a wireless alarm system in which an alarm can be issued even on the receiver side by a notification from the user. Note that the slave unit has a built-in battery power source, and can be freely installed at a required place.

[Means for Solving the Problems] By the way, in such a conventional wireless alarm system, depending on the installation location of the slave unit, the transmitted radio wave from the slave unit becomes weak and normally received by the master unit. It may not be possible. Therefore, a radio wave propagation test is performed in which smoke or the like is caused to flow into a fire detector provided in a slave unit to make a test alert, and whether or not the master unit can receive normally is checked.

However, the operation to make the detector emit a test by inhaling smoke etc. is complicated, and even in the case of a test, the alarm signal is transferred to the receiver in accordance with the alarm operation of the master unit. Since the notification is performed, the alarm operation on the receiver side must be canceled, and there is a problem that the radio wave propagation test of the wireless alarm system becomes complicated.

The present invention has been made in view of such conventional problems, and has as its object to provide a wireless alarm system that can easily and easily perform a radio wave propagation test from a slave to a master.

[Means for Solving the Problems] In order to achieve this object, the present invention is configured as follows. The reference numerals of the drawings of the embodiments are also shown.

First, the present invention, a sensor 10 for detecting an abnormality such as a fire,
A slave unit 12 for wirelessly transmitting an abnormal signal from the sensor 10 together with its own address signal; receiving and decoding a transmission radio wave from the slave unit 12 to individually display an alarm on an abnormal state based on the address signal and display a transmission line; And a base unit 14 for transferring an alarm signal to the receiver 100 via the wireless alarm system.

In the present invention for such a wireless alarm system, a test switch 16 for performing a radio wave transmission test is provided to the slave 12 and a test signal is transmitted to the master 14 when the test switch 16 is operated. And a test transmitting means 18 for transmitting together with the address signal of
A transmission inhibition means 20 for inhibiting transmission to the receiver 100 when a test signal is received from the receiver 100 is provided.

[Operation] According to the wireless alarm system of the present invention having such a configuration, when the test switch 16 provided on the slave 12 is operated, the test signal is transmitted together with the individual address signal of the slave 12 to the master 14. The master unit 14 displays an alarm based on the test signal when receiving the test signal.However, the transfer to the receiver 100 is prohibited, simplifying the test operation on the slave unit and simplifying the operation on the master unit. The radio wave propagation test from the slave unit can be easily performed by eliminating the operation such as resetting the receiver alarm accompanying the test.

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

In FIG. 1, reference numerals 12-1, 12-2,..., 12-n denote slave units installed on a ceiling surface or the like of a guard area, and each has a fire detector 10 detachably attached to a lower portion thereof. . Slave units 12-1
When the fire detector 12-n receives the fire detection signal generated by the fire detector 10, it transmits a fire detection signal together with its own assigned address signal from the antenna 22 to the master unit 14. Here, the slave units 12-1 to 12-n have six transmission channels CH1 to C
H6 is allocated. Prior to transmission, first, a carrier state of a channel to be transmitted is performed as a reception state, and if there is no carrier, the state is switched to a transmission state and a fire detection signal is transmitted together with an address signal. on the other hand,
When the use of a channel by another slave is detected by the carrier sense, the channel is switched to the carrier sense of the next channel CH2, and the channel is switched until an empty channel is found.

The parent device 14 receives and decodes a transmission radio wave transmitted from any of the child devices 12-1 to 12-n, and individually displays an alarm on an abnormal state based on the address signal. The master unit 14 is connected to a receiver 100 such as a fire alarm facility via a transmission line 102,
An alarm signal is transmitted to the receiver 100 via the transmission line 102 together with an alarm display based on the decoding of the reception of the transmission radio wave from the slave unit, so that the receiver 100 can also display the alarm.

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 slave units 12-1 to 12-n. In this embodiment, the test switch 16 is a switch that is incorporated in the slave casing and operates by receiving external magnetism. When a magnet is brought close to the slave casing during a test, the test switch 16 is turned on. Each of the slave units 12-1 to 12-n is provided with a function as a test transmission unit for transmitting a test signal to the master unit 14 together with its own address signal when the test switch 16 is operated.

On the other hand, when the base unit 14 receives the test signal transmitted from the slave unit, the base unit 14 sounds the fire indicator light and the alarm buzzer based on the received slave unit address, but does not notify the receiver 100 of the alarm signal. A function as a transfer prohibition means for prohibition is provided.

FIG. 2 is an embodiment configuration diagram showing one embodiment of the slave unit of the present invention.

In FIG. 2, the slave unit 12 is provided with a CPU 24, and the functions of the transmission control unit 26 and the test transmission unit 18 are realized by program control.

Reference numeral 28 denotes a fire receiving circuit to which the fire detector 10 is connected. When the fire detector 10 issues an alarm, it outputs a fire reception output to the CPU 24 and the activation 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. Upon receiving the fire reception output, the start-up circuit 30 controls the power supply control circuit 32, supplies power from the battery power supply 25 to the CPU 24, and starts the CPU 24 power-on. A transmission operation of transmitting a fire detection signal together with the address to the parent device is performed.

For the CPU 24, the address setting circuit 34 and the EEPRO
A nonvolatile memory 35 using M is provided. The address setting circuit 34 sets a group address (lower order) in which one master unit and a plurality of slave units constitute one group, and an individual address which is predetermined for each slave unit. The non-volatile memory 35 stores a call identification signal (ID code) approved by the Minister of Posts and Telecommunications and a higher-order group address for extending the group address, and the call identification signal read from the non-volatile memory 35 at the time of transmission first. Send That is, a specific low-power radio station defined by the Radio Law is required to transmit a call identification signal (ID code) first during radio transmission.

It is needless to say that an appropriate transmission format can be adopted in other wireless systems such as a weak radio wave.

Reference numeral 36 denotes a periodic notification circuit, for example, 9
Once a time, a periodic report output is generated in the start-up circuit 30 and the CPU 24, and the power-on start of the CPU 24 by the operation of the power supply control circuit 32 activates the transmission control unit 26 to perform one periodic report transmission operation.

Further, in the present invention, a test switch 16 is provided for the CPU 24 via a test circuit 37, and the test switch 16 is built in the slave case as shown in FIG. Yes, when the magnet is externally approached to the position where it is incorporated into the test switch 16, it is turned on, and the test circuit 37 outputs a test output to the fire receiving circuit 28 and the CPU 24. Fire receiving circuit receiving test output from test circuit 37
As in the case of the alarm of the fire detector 10, the signal 28 generates a reception output in the activation circuit 30, activates the power supply control circuit 32, and performs the test transmission operation in the test transmission section 18 by the power-on start of the CPU 24.

 A transmission / reception circuit unit is provided on the left side of the CPU 24.

In this transmission / reception circuit section, reference numeral 40 denotes a synthesizer circuit, which includes a PLL circuit 42, a VCO (voltage controlled oscillator) 44, and an amplifier 46. The oscillation frequency of VCO44 is
It can be changed freely by setting the division ratio data from U24. The synthesizer circuit 40 oscillates the local oscillation frequency on the receiving side at the time of carrier sense prior to transmission,
When a transmission channel is selected by carrier sense, the carrier frequency of the transmission channel is oscillated.

The output of the synthesizer circuit 40 is supplied to a transmission circuit 50 or a high-frequency amplification / mixing circuit 54 on the reception side via a signal switch 48. The output of the transmitting circuit 50 is provided to the antenna 22 via the antenna switch 52. The other end 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 performs frequency conversion by mixing the received signal with the local oscillation frequency fr given from the synthesizer circuit 40, and outputs an intermediate frequency fi signal to the intermediate frequency amplification / mixing circuit 56.

Here, the slave unit can transmit using six channels of the 429 MHz band. For example, taking the channel CH1 as an example, the carrier frequency ft1 for the transmission circuit 50 is 429.175 MHz, and the intermediate frequency f1 is 21.7 MHz. Then, the local oscillation frequency fr1 for the high frequency amplification / mixing circuit 54 at the time of carrier sensing of the channel CH1 becomes 407.475 MHz.

The intermediate frequency amplification / mixing circuit 56 is a high frequency amplification / mixing circuit 54
Is converted to a 455 KHz intermediate signal using a fixed local oscillator. Such a 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 superheterodyne method.

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

Reference numeral 60 denotes an MSK modem, which converts a reception frequency signal from the intermediate frequency amplification / mixing circuit 56 into data bits 1, 0,
The data bits 1, 0 from the PU 24 are converted into two different frequency signals. For example, data bit 1 corresponds to 1200 Hz,
Data bit 0 corresponds to 1800 Hz. Modulation of data bits at the time of transmission output from the CPU 24 is performed by the MSK modem 60 converting the frequency to 1200 or 1800 Hz corresponding to the data bits 1 and 0 and giving the control signal to the VCO of the synthesizer circuit 40 as a control signal. Performs MSK modulation of frequency.

Further, reference numeral 62 denotes a power supply switching circuit which controls on / off of power supply to the receiving circuit unit and the transmitting circuit unit under the control of the CPU 24. That is, the power supply to the receiving circuit unit is turned on at the time of the first carrier sense, and the power supply to the transmitting circuit unit is turned on after the receiving circuit unit is turned off at the next transmission. That is, in this embodiment, the reception mode and the transmission mode are switched by turning on and off the power supply to the reception circuit unit and the transmission circuit unit. For this reason, the signal switch 48 and the antenna switch 52 are switched so that the circuit section that has been operated by the power supply is enabled.

FIG. 3 is a timing chart of a continuous transmission operation when the fire detector of FIG. 2 issues an alarm.

As is clear from FIG. 3, first, an idle channel is selected by carrier sense as a reception state, and then a transmission operation is performed during a transmission period of T1 = 8 seconds as a transmission state, and then a pause period of T2 = 2 seconds. And repeat the following.
The call identification code is transmitted first in the transmission period of T1 = 8 seconds. This call identification code is stored in the non-volatile memory 35 and is read at the time of power-on start of the CPU 24,
The transmission format shown in FIG. 4 is created and the call identification code is transmitted.

When the transmission of the call identification code is completed, the transmission of the mark and the transmission data is repeated alternately. The mark is data in which bit 1 is continuous, and the transmission code includes an address and detection information. For example, as shown in FIG. 5, the mark is composed of four frames 1 to 4. In FIG. 5, frame 1
The first start bit 0 and the last start bit 1 of .about.4 are used for frame synchronization, the 8 bits following the start bit are used as a data area, and the frame 1 stores a group address (upper). Frame 2
Stores an individual address and a group address (lower order).
Frame 3 incorporates an alarm or test signal,
Further, the frame 4 incorporates horizontal parity bits. The horizontal parity bit of frame 4 is
The parity bit is set so that the sum of the same bit positions of the two bits becomes an odd number for example. Following the 8-bit data area, a parity bit for performing a parity check in each frame unit is provided.

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

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

In the steady monitoring state, the reception control unit 66 of the CPU 64 sequentially sets the frequency division ratio data for performing the carrier sense of the six channels CH1 to CH6 to the synthesizer circuit 72, and monitors the carrier sense output from the reception circuit 70. I have. 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 reception signal from the reception circuit 70 is demodulated into data bits 0 and 1 by the MSK modem 74 and is taken into the CPU 64. The processing of the received data captured by the CPU 64 is performed by first checking whether the received address matches the address by the address setting circuit 76, and if they match, decoding the data area, and determining the fire detection signal, the display circuit 78. , The fire indicator light 80 is turned on, the address of the slave unit is displayed on the address display 82, and the alarm buzzer shown is sounded. Also, the transfer circuit 84 is activated to operate the transmission line 10.
An alarm signal is transmitted to the receiver 100 via 2.

In the present invention, such a master unit 14 is provided with a new transfer inhibition circuit 20. When the CPU 64 decodes the test signal from the received signal of the slave unit, the transfer inhibition circuit 20 is operated. The function of the alarm circuit 84 is stopped, the transfer of the alarm signal accompanying the reception of the test signal to the receiver 100 is prohibited, and only the lighting of the fire indicator light 80 in the master unit 14 and the display of the slave unit address on the address display 82 are performed. I do it.

Next, the test transmission operation when the test switch 16 provided in the slave unit shown in FIG. 2 is operated will be described with reference to the operation flow chart shown in FIG.

Test switch by bringing the magnet close to the slave unit housing
When the 16 is turned on, a test output is given to the CPU 24 and the fire receiving circuit 28 via the test circuit 37, and the fire receiving circuit 28
Generates a fire reception output to the activation circuit 30 and the CPU 24 in the same manner as when the alarm is issued. For this reason, the start-up circuit 30 turns on the power supply control circuit 32, the power is supplied from the battery power supply 25 to the CPU 24, and the operation flow of FIG.

In FIG. 7, first, an initialization process is performed in step S1 (hereinafter, "step" is omitted), and then the test circuit is performed in S2.
The test port from 37 is read and stored. At this time, since the test output is obtained, it is recognized that the test operation has been performed.

Next, proceeding to S3, the call identification signal and the group address (upper) are read from the nonvolatile memory 35, and the address setting circuit is read.
The group address (lower order) and the individual address are read from 34, and a delay time previously set randomly for each slave unit is set.

Next, in S4, frequency division ratio data for oscillating the local oscillation frequency of channel CH1 is set in PLL circuit 42 for carrier sensing of channel CH1 to be transmitted from now on. continue
In step S5, the power supply to the receiving circuit unit is turned on and the operating state is established. Then, the process proceeds to the determination of carrier detection. If no carrier is detected in S8, the process proceeds to S11, and waits for the elapse of the delay time by repeating the processing of S8 and S11.
After the receiving circuit unit is turned off in step 2, the frequency division ratio data is set in the PLL circuit 42 so as to oscillate the carrier frequency of the selected channel CH1, and in step S13, the power supply to the transmitting circuit unit is turned on to set the operating state. I do.

Next, the call identification code is transmitted first in S14, and then the mark and the transmission code are transmitted in S15. In transmitting the transmission code, a fifth code is read based on the test output read and stored in S2.
A test signal is set in the data area of frame 3 in the figure in place of the alarm signal and transmitted. Subsequently, the transmission number counter A is incremented in S16, the transmission of the transmission code including the test signal and the mark of S15 is repeated in S17 until the transmission number reaches a predetermined number n, for example, 75 times, and the timer is paused for 2 seconds in S18. Thereafter, it is checked in step S19 whether 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 again to repeat the same test signal transmission operation. On the other hand, if the test switch 16 has already been deactivated, the process proceeds to S20, in which the CPU 24 performs power-off control on the activation circuit 30, cuts off the power supply to the CPU 24, and ends the transmission operation.

On the other hand, when the carrier of the channel CH1 is obtained by the carrier detection of S8, it is determined whether the carrier detection is continued for a predetermined time in S9, and if the carrier detection is continued for a predetermined time, the process proceeds to S10, and the next step is performed. Frequency division ratio data for performing carrier sensing on the receiving channel CH2 is set in the PLL circuit 42, and carrier sensing is repeated in the same manner. Thereafter, carrier sensing is repeated until an empty channel is obtained.

In contrast to the operation of transmitting the test signal on the slave unit side shown in FIG. 7, in the master unit 14 shown in FIG. 6, when the CPU 64 receives and decodes the test signal from the slave unit, the display circuit 78 Turns on the fire indicator light 80, displays the slave unit address on the address display 82, and sounds the alarm buzzer, but simultaneously activates the transfer inhibition circuit 20 to stop the function of the transfer circuit 84. By doing so, the transfer of the alarm signal to the receiver 100 is prohibited.

On the other hand, the transmission operation of the slave unit when the fire detector 10 issues an alarm is exactly the same as that at the time of transmitting the test signal except that the transmission code transmitted in S15 in FIG. 7 becomes an alarm signal.

In the above embodiment, the test switch 16 which is turned on by bringing the magnet close to the slave unit is taken as an example. However, in addition to the magnet operation switch, a push button switch or a pull string switch light, an appropriate test It may be a switch. In the above embodiment, the fire detector is attached to the slave unit as an example.In addition, a gas leak detector, an intruder detector, and other appropriate abnormality detectors are attached. Is also good.

[Effects of the Invention] As described above, according to the present invention, when the test switch provided on the slave is operated, the test signal is transmitted to the master along with the individual address signal of the slave, and the master performs the test. When a signal is received, an alarm is displayed based on the test signal.
The transfer to the receiver is prohibited, and the test operation on the slave unit in the propagation test from the slave unit to the master unit can be simplified, and operations such as resetting the receiver alarm accompanying the test on the master unit can be performed. The propagation test from the slave unit can be performed easily and easily without making it unnecessary.

[Brief description of the 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; FIG. 3 is a transmission timing chart of the slave unit of the present invention; FIG. 5 is a diagram showing the format of the transmission code transmitted from the slave unit of the present invention; FIG. 6 is a diagram showing the embodiment of the master unit of the present invention; FIG. It is an operation | movement flowchart which showed the test signal transmission operation | movement of the slave of this invention. In the figure, 10: fire detector 12, 12-1 to 12-n: slave unit 14: master unit 16: test switch 18: test transmission unit (means) 20: transfer inhibition circuit (means) 22, 68: antenna 24, 64: CPU 25: Battery power 26: Transmission control unit 28: Fire receiving circuit 30: Start circuit 32: Power supply control circuit 34, 76: Address setting circuit 36: Periodic notification circuit 40, 72: Synthesizer circuit 42: PLL 44 : VCO 46: Amplifier 48: Signal switch 50: Transmit 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: Receiver circuit 78: Display circuit 80: Fire indicator light 82: Address display 84: Notification circuit 100: Receiver 102: Transmission line

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G08B 25/10 G08B 29/00

Claims (1)

(57) [Claims] 1. A sensor for detecting an abnormality such as a fire, a slave unit for wirelessly transmitting an abnormal signal from the sensor together with its own address signal, and an abnormal state by receiving and decoding a transmission radio wave from the slave unit. And a master unit for individually displaying an alarm based on the address signal and transferring the alarm signal to the receiver via the transmission line, wherein the slave unit performs a radio wave transmission test. A test switch to be performed, and test transmitting means for transmitting a test signal to the master unit together with its own address signal when the test switch is operated, wherein the master unit receives a test signal from the slave unit. A radio alarm system, further comprising a transmission prohibition unit for prohibiting transmission to the receiver.