JPH04340195A - Radio alarm device - Google Patents

Abstract

PURPOSE:To surely receive and decode radio signals from radio transmitters and a repeater without disabling receiving capability even when the same radio signal from the repeater is in a receivable state simultaneously with the reception of the radio signal from the radio transmitters. CONSTITUTION:Each of the radio transmitters 2a, 2b is provided with a transmission control means capable of repeating operation for extracting and setting up a delay time at random from an information table at the time of obtaining an abnormally detecting output, and after the lapse of the set delay time, sending information within a prescribed transmission time and the repeater 3 is provided with a repeat control means capable of repeating operation for receiving radio signals from the radio transmitters 2a, 2b, temporarily storing the received signal transmitting the stored receiving information after the lapse of the delay time extracted at random from the information table and set up during the aborting time of the transmitters 2a, 2b.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless alarm system in which detection information is transmitted from a wireless transmitter at the time of output from an abnormality detector, and is received via a repeater or directly by a receiver to issue an alarm.

0002

[Prior Art] Conventionally, in this type of wireless alarm device, a plurality of wireless transmitters equipped with abnormality detectors, such as smoke detectors, are installed as terminals in a warning area, and fire signals are transmitted from the smoke detectors. When the fire detection information is output, the fire detection information is transmitted as a wireless signal along with the address information. If the wireless signal from the wireless transmitter reaches the receiver directly, it will be received by the receiver and an alarm will be issued. However, if the installation location is far from the receiver, a wireless repeater should be installed in between. The radio signal from the transmitter is relayed to the receiver.

0003

[Problems to be Solved by the Invention] However, in such a conventional radio alarm device, when a plurality of radio transmitters transmit radio signals using a single frequency channel, the terminal Depending on the installation location, the receiver may receive both the wireless signal from the wireless transmitter and the same wireless signal from the repeater, and unless the field strength of either side is strong, reception may be impossible due to interference. There was a problem with it.

[0004] The present invention has been made in view of the above-mentioned problems in the prior art. Another object of the present invention is to provide a radio alarm device that enables a receiver to reliably receive and decode radio signals from a radio transmitter and a repeater without becoming unreceivable.

[0005]

[Means for Solving the Problems] In order to achieve this object, the present invention is constructed as follows. In addition, the reference numerals in the drawings of the embodiments are also shown. First, the present invention wirelessly transmits abnormality detection information using a single channel by repeating a predetermined transmission time T1 and rest time T2 when a detection output from an abnormality detector 1 such as a fire detector is obtained. one or more wireless transmitters 2
, a relay 3 that relays the wireless signal from the wireless transmitter 2 to the receiver side, and a receiver 4 that receives the transmitted signals from the wireless transmitter 2 and the relay 3 and issues an alarm. The target is

In the present invention for such a wireless alarm device, the wireless transmitter 2 includes an information table 11 storing pseudo-randomized numerical information on delay times and a detection output from the abnormality detector 2. A transmission control means 9 is provided which repeats the operation of randomly extracting and setting a delay time from the information table 11 when the delay time is obtained and transmitting the information after the set delay time has elapsed within a predetermined transmission time T1. shall be.

[0007] Also, the repeater 3 includes an information table 25 that stores numerical information on pseudo-randomized delay times, and temporarily stores received information when receiving a wireless signal from the wireless transmitter 2. The storage means 26 randomly extracts and sets a delay time from the information table 25, and transmits the reception information stored in the storage means 26 during the rest time T2 of the wireless transmitter 2 after the set delay time has elapsed. It is characterized in that a repeating relay control means 22 is provided within T1.

[0008]

[Operation] According to the wireless alarm device of the present invention having such a configuration, a wireless signal from a wireless transmitter that receives an abnormality detection output is directly received by the receiver, and at the same time, a wireless signal from the same wireless transmitter is received directly by the receiver. When a radio signal is received by a receiver after being relayed by a repeater, the repeater temporarily stores the information received during the transmission time T1 of the radio transmitter, and then returns to the next rest time T.
2 to the receiver, the receiver can receive the wireless signal from the wireless transmitter and the same wireless signal from the repeater separately in time, and the two wireless signals are the same. Even if the frequency channels and electric field strengths are the same, it is possible to reliably receive and decode the signal and issue an alarm.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram showing the overall configuration of a wireless alarm device according to the present invention. In FIG. 1, 2a, 2b, 2
c is a wireless transmitter, and abnormality detectors 1a to 1c, respectively.
For example, smoke detectors are used as the abnormality detectors 1a to 1c.

When each of the wireless transmitters 2a to 2c receives a detection output from the abnormality detector 1, it transmits abnormality detection information together with its own terminal address in the form of a wireless signal. The same frequency channel is used for the radio signals from the radio transmitters 2a to 2c, and for example, a specific frequency channel in the 429 MHz band is used. 3 is a wireless repeater, which in this embodiment relays and transmits wireless signals from the wireless transmitters 2a and 2b.

[0011] A receiver 4 receives and decodes the radio signal from the repeater 3 and the radio signal from the transmitter 2c, and displays an alarm based on abnormality detection information contained in the received signal. An alarm receiving panel 5 in the original fire alarm equipment is connected to the receiver 4 by a signal line, so that the alarm receiving panel 5 can also issue an abnormal alarm upon receiving the transfer output from the receiver 4. .

In the case of FIG. 1, the transmission signal from the wireless transmitter 2a is relayed by the wireless repeater 3 and at the same time can be directly received by the receiver 4. For this reason, the wireless transmitter 2
When a wireless signal is transmitted from a, in the conventional device, the same wireless signal relayed by the repeater 3 is simultaneously transmitted to the receiver 4.
However, due to interference between the two radio signals, reception becomes impossible.

Therefore, in the present invention, the repeater 3 is configured to relay the signal to the receiver 4 using the down time of the radio signal from the radio transmitter 2a. That is, in the wireless transmitters 2a to 2c, when the detection outputs of the abnormality detectors 1a to 1c are obtained, the wireless signals are transmitted by repeating the transmission time T1 and the pause time T2.

Therefore, the repeater 3 receives and temporarily stores the wireless signals from the wireless transmitters 2a to 2c, and transmits the stored wireless signals to the receiver 4 during the next pause time T2. However, relay transmission will be performed. Through such relay transmission using the rest time of the wireless transmitters 2a to 2c by the repeater 3, the reception of the wireless signals from the wireless transmitters 2a to 2c and the wireless signal from the repeater 3 at the receiver 4 is delayed. Even if they are on the same frequency channel, they can be received without problems.

Furthermore, in the present invention, in order to avoid reception failure due to collision of radio signals when two radio transmitters transmit radio signals at the same time, the radio transmitters 2a to 2c transmit radio signals as described below. As will be clear, the operation of setting a delay time using an information table storing numerical information of pseudo-randomized delay times and transmitting abnormality detection information after the set delay time has elapsed is repeated.

The delay time setting using such an information table is performed in the repeater 3 in the same manner. FIG. 2 is a block diagram showing an embodiment of the wireless transmitter of the present invention in FIG. 1. As shown in FIG. In FIG. 2, the abnormality detector 1
The detection output from is received by the receiving circuit 6 and given to the signal processing circuit 7. An address setting circuit 8 is provided for the signal processing circuit 7, and a terminal address unique to the wireless transmitter is set therein.

When the signal processing circuit 7 receives the reception output of the abnormality detection signal from the receiving circuit 6, it creates a predetermined transmission format including address information and abnormality detection information, and sends it to the CPU.
Hand over to 9th. The CPU 9 has a function as a transmission control unit, and repeatedly transmits the transmission format created by the signal processing circuit 7 over a predetermined transmission time T1, followed by a pause time T2, and thereafter repeats this transmission operation and pause operation. repeat.

[0018] Here, the transmission time T1 is, for example, T1=3
seconds, and the pause time T2 is set to T2=2 seconds. Also, C
PU9 transmits a call identification code (ID code) approved by the Minister of Posts and Telecommunications at the start of transmission at transmission time T1. This is because specified low-power radio stations under the Radio Law are required to send a call identification signal at the beginning of transmission.

Further, the CPU 9 is provided with a delay time setting counter 13 used for setting delay times, and the ROM 10 is provided with an information table 11 storing pseudo-randomized numerical information on delay times. ing. Of course, for the CPU 9, there is an RA that temporarily stores data.
M12 is provided. The delay time setting counter 13 is CP
The counting operation is sequentially repeated in response to a clock generated, for example, once every two seconds from U9, and specifically, a binary 3-bit counter is used.

FIG. 3 is an explanatory diagram showing details of delay time setting in the embodiment of FIG. 2. In FIG. 3, CPU9
An information table 11 stored in a ROM 10 is provided on the side, and the information table 11 stores a numerical series of pseudo-randomized delay times as shown. In this example, the delay time numerical series is at address 000,
001,...111, 0.2 seconds, 0.0 seconds,...0
．． It is stored as 8 seconds.

The delay time setting counter 13 counts clocks to generate a binary 3-bit output b2b1b0, and provides this counter output to the delay time setting section 18 in the CPU 9. The delay time setting section 18 uses the abnormality detection output to control the CPU 9.
At the timing when the power is started, the 3-bit output b2b1b0 of the delay time setting counter 13 is read,
A read access is executed using this counter output as an instruction parameter for the address of the information table 11, the delay time of the address position is read, and the delay time for starting transmission of a wireless signal is set.

This delay time is set at the beginning of the transmission time T1, for example, when the delay time of address 010 of information table 1 is set to 0.
．． If 8 seconds is set, the first wireless signal will be transmitted when this delay time has elapsed, and then the next address 011 will be transmitted.
After a delay time of 0.4 seconds has elapsed, the next radio signal is transmitted, and thereafter, radio signals are repeatedly transmitted within the transmission time T1 according to the order of the numerical series.

Referring again to FIG. 2, the transmission information from the CPU 9 is MSK modulated by the MSK modem 14, and transmitted from the transmission antenna 17 via the RF transmission unit 15 to 429MH.
Transmitted on a specific frequency channel in the Z band. Power supply to the RF transmitting unit 15 is performed by a power supply control section 16,
The power supply control unit 16 is controlled by the CPU 9 to control R during the transmission time T1.
Power is supplied to the F transmitting unit 15 to perform a transmitting operation, and when the transmitting time T1 has elapsed, the power supply is cut off for a pause time T2, thereby stopping the transmitting operation of the RF transmitting unit 15.

The MSK modem 14 has a function of converting data bits 1 and 0 from the CPU 9 into frequency signals of 1200 Hz and 1800 Hz, and the frequency signal converted from the data bits 1 and 0 is given to the VCO of the synthesizer circuit and used as a carrier. MSK modulation of frequency is performed. FIG. 4 is a block diagram showing an embodiment of the wireless repeater 3 shown in FIG. 1. As shown in FIG.

In FIG. 4, 19 is a receiving antenna, and the radio signal from the radio transmitter received by the receiving antenna 19 is demodulated by the RF receiving unit 20. For example, 120
It is given to the MSK modem 21 as receiving frequency signals of 0 Hz and 1800 Hz. MSK modem 21 is 1200H
z and 1800 Hz reception frequency signals are converted into data bits 1 and 0, respectively, and provided to the CPU 22.

The CPU 22 has a function as a relay control section, and includes an address setting circuit 23, a ROM 24, a RAM 26, and a delay time setting counter 27. The address setting circuit 23 sets a unique repeater address. ROM24
Information table 2 stores the same pseudo-randomized numerical information on delay times as information table 11 shown in FIG.
5 is provided.

The RAM 26 has a function as a storage section that temporarily stores the address information obtained from the radio signal received by the radio repeater and the transmission format of the abnormality detection information to the receiver side. That is, when the CPU 22 receives transmission information based on reception of a wireless signal from an appropriate wireless transmitter via the MSK modem 21, the CPU 22 temporarily stores this transmission information in the RAM 26.

Further, the CPU 22 checks the start timing of the pause time T2 of the wireless transmitter currently transmitting the wireless signal from the reception timing of the wireless signal. The transmission information temporarily stored in the RAM 26 over time T2 is read out, for example, a transmission format with a new repeater address added is created, and the transmission information is transmitted from the transmission antenna 31 to the receiver side via the MSK modem 28 and the RF transmission unit 29. relays and transmits wireless signals to.

Even in relay transmission using the pause time on the wireless transmitter side, the delay time is set in the same manner as shown in FIG. 3 based on the information table 25 in the ROM 24 and the delay time setting counter 13. When the delay time elapses, the wireless signal is relayed and transmitted repeatedly. The RF transmitting unit 29 receives control of transmitting operation and stopping operation by the power supply control section 30. A transmission control signal is given to the power supply control unit 30 by the CPU 22, and this transmission control signal is applied over the rest time T2 of the wireless transmitter that is transmitting the currently received wireless signal.

The transmission control signal from the CPU 22 is given to the RF receiving unit 20 via the inverter 45, and while the RF transmitting unit 29 is performing a transmitting operation, the inverter 45 outputs an inverted signal to the RF receiving unit 20 to receive the signal. Operation is prohibited. FIG. 5 is a block diagram of an embodiment of the receiver 4 shown in FIG. In FIG. 5, 32 is a receiving antenna, and the radio signal from the radio transmitter or radio repeater received by the receiving antenna 32 is demodulated by the RF receiving unit 33 and sent to the MSK modem 34 as a combination of frequency signals of 1200 Hz and 1800 Hz. The MSK modem 34 converts the signals into data bits 1 and 0, respectively, and provides the data bits to the CPU 35 as a reception control section.

The CPU 35 includes an address setting circuit 36, R
OM37 and RAM38 are connected. CPU35
reproduces the transmission format from the data bit string from the MSK modem 34, decodes the address information and abnormality detection information of the transmission format, and displays the display unit 39 based on the decoding result.
, the alarm section 40 is used to perform alarm display and alarm output.

Furthermore, a control section 41 is connected to the CPU 35, and controls equipment such as smoke prevention equipment as necessary. Furthermore, the abnormality detection signal from the CPU 35 is sent to the transfer unit 4.
2 to the alarm receiving board 5 shown in FIG. 1, for example. FIG. 6 shows the transmission operation and relay operation when the transmitter 2a first transmits a wireless signal based on the abnormality detection output and then the wireless transmitter 2b transmits the wireless signal based on the abnormality detection output in FIG. This is a timing chart showing the following.

In FIG. 6, first, at time t1, the wireless transmitter 2a starts a transmission operation upon receiving the detection output of the abnormality detector 1. That is, the wireless transmitter 2a has a transmission time T1=3.
The device is in a transmitting state for seconds, and after the set delay time has elapsed according to the delay time settings shown in FIG. 3, a radio signal including the terminal address and abnormality detection information shown in the shaded area is transmitted.

[0034] When the first wireless signal transmission is completed, the screen shown in FIG.
After setting the next delay time according to the information table 11, the same radio signal is transmitted, and the transmission operation is repeated in the same manner over the transmission time T1. When the transmission time T1 = 3 seconds has elapsed, the transmission operation of the wireless transmitter 2a is stopped for a pause time T2 = 2 seconds. Similarly, transmission time T1 and pause time T2
The transmission operation is performed by repeating .

[0035] Such a radio signal from the radio transmitter 2a is received by the radio repeater 3, and is temporarily stored in the RAM 26 in the radio repeater shown in FIG. Wireless transmitter 2
Time t2 when a sent the last wireless signal within transmission time T1
When this occurs, the wireless repeater 3 determines that the pause time has begun, and performs a transmission operation for two seconds equal to the pause time T2 of the wireless transmitter 2a.

The transmission operation of the radio repeater 3 is also carried out after the set delay time shown in FIG. 3 has elapsed within the transmission time T2.
The operation of reading the information stored in the device and transmitting it as a wireless signal is repeated as shown in the shaded area. Further, the RF receiving unit 20 is placed in a reception stopped state when transmitting the radio signal shown in the shaded area.

[0037] Therefore, the radio signal from the radio transmitter 2a and the same radio signal from the radio repeater 3 are received by the receiver side separately in time, and even if they are on the same frequency channel, the radio signals are reliably received. can be deciphered. Suppose then that the wireless transmitter 2b starts a transmission operation upon receiving an abnormality detection output at time t3.

The transmission of the wireless signal shown by the shaded area within the transmission time T1 of the wireless transmitter 2b depends on the delay time setting specific to the wireless transmitter 2b. The probability of overlap with the transmission timing of the wireless signal 2a is extremely small, and the wireless repeater 3 side can effectively receive the wireless signals from the wireless transmitters 2a and 2b.

At time t4, the wireless repeater 3 determines the rest time of the wireless transmitter 2a, and performs the transmission operation again for the time T2. In this transmission operation, the wireless transmitter 2a
Since the received information of the two wireless signals from the wireless transmitters 2a and 2b is stored in the RAM 26, two pieces of the transmitted information from the wireless transmitters 2a and 2b are relayed and transmitted in succession. In the above embodiment, a fire detector is used as an example of an abnormality detector, but other suitable abnormality detectors such as a gas leak detector or an intruder detector may be used.

[0040]

As explained above, according to the present invention, a radio signal from a radio transmitter using the same frequency channel and the same radio signal relayed and transmitted by a repeater can be received at the receiver side. Even if possible, the repeater uses the pause time of the wireless transmitter's transmission operation to relay the wireless signal, so even if the same wireless signal is received, the receiver side will not be able to transmit the wireless signal from the wireless transmitter It is possible to reliably receive and decode the signal and the radio signal from the repeater, and it is possible to perform highly reliable abnormality monitoring by minimizing interference in radio alarm devices that use repeaters on the same frequency channel. .

[Brief explanation of drawings]

[Fig. 1] Explanatory diagram showing the overall configuration of the present invention

[Fig. 2] Example configuration diagram of a wireless transmitter according to the present invention

[Fig. 3] Example configuration diagram showing details of delay time setting in the example of Fig. 2

[Fig. 4] Embodiment configuration diagram of a wireless repeater according to the present invention

[Fig. 5] Example configuration diagram of a receiver in the present invention

[Figure 6] Time chart showing transmission/reception and relay operations during abnormality detection operation of the present invention

[Explanation of symbols] 1, 1a to 1c: Abnormality detector 2, 2a to 2c: Wireless transmitter 3: Wireless repeater 4: Receiver 5: Alarm receiving board 6: Receiving circuit 7: Signal processing circuit 8, 23, 36: Address setting circuit 9: CPU (transmission control unit) 10, 24, 37: ROM 11, 25: Information table 12, 26, 38: RAM 13, 27: Delay time setting counter 14, 21, 28, 34: MSK Modem 15, 29:R
F transmitting units 16, 30: power supply control sections 17, 31: transmitting antennas 18: delay time setting sections 19, 32: receiving antennas 20, 33: RF receiving unit 22: CPU (relay control section) 38: CPU (reception control section) ) 39: Display section 40: Alarm section 41: Control section 42: Transfer section 45: Inverter

Claims (1)

[Claims] Claim 1: One or more wireless transmitters that wirelessly transmit abnormality detection information by repeating a predetermined transmission time and rest time using a single frequency channel when a detection output is obtained from an abnormality detector. A wireless alarm device comprising: a relay that relays a wireless signal from the wireless transmitter to a receiver side; and a receiver that receives the transmitted signals from the wireless transmitter and the relay and issues an alarm. , the radio transmitter has an information table storing pseudo-randomized numerical information on delay times, and when a detection output from the anomaly detector is obtained, the delay time is randomly extracted from the information table. a transmission control means that repeats an operation of setting and transmitting information after the set delay time has elapsed within the predetermined transmission time, and the repeater includes an information table storing numerical information of pseudo-randomized delay times. a storage means for temporarily storing received information when receiving a wireless signal from the wireless transmitter; and a storage means for randomly extracting and setting a delay time from the information table to set a rest time of the wireless transmitter. and relay control means for repeating an operation of transmitting the received information stored in the storage means after the set delay time has elapsed, within the pause time.