JPH03282999A - Radio type alarm system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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.

[Conventional technology] Conventionally, in order to monitor fires at construction sites such as buildings, a slave unit with a fire detector directly attached externally was installed on the ceiling side of a warning area, and when a fire signal was received from the fire detector, A wireless alarm system has been proposed that notifies parents of abnormalities by wirelessly transmitting an abnormality detection signal together with the child device address to the parent clan.

The slave unit has a built-in battery power supply, and can be freely installed in any desired location.

In such a wireless alarm system, one group consists of one parent unit and, for example, eight slave units, and each group has a maximum of eight slave units that can communicate with the parent unit, each with a different dedicated A frequency channel is assigned, and when an abnormality is detected, an abnormality detection signal is sent to the parent domain along with the child device address (group address and individual address).

The abnormality detection signal is transmitted from the child device continuously, for example, with a 3-second transmission period and a 2-second pause period, while the fire signal is being obtained. Furthermore, in order to avoid collisions caused by simultaneous transmissions from slave units of other groups assigned the same channel, the delay time is set randomly within the transmission period, and transmission is performed at least once every time the set delay time elapses. Repeating the action.

On the other hand, in the parent domain, carrier sensing is performed sequentially on the eight channels assigned to the child device, and when a carrier is detected, the detection channel is fixed in the receiving state and an abnormality detection signal is received from the child device, and the abnormality is detected. Identifies and displays the status and issues an alarm.

By the way, in such conventional wireless alarm systems, address information is collected by operating a test switch on the slave side in order to confirm whether transmission from the slave unit to the parent unit is normal during installation or inspection. The radio wave transmission test is being conducted to determine whether the friendly side can obtain the specified received field strength by transmitting a test signal containing 3 seconds and a 2 second pause.

[Problem to be solved by the invention] However, in the conventional system, the strength of the radio waves transmitted from the slave device during the radio wave transmission test was measured using a field strength meter at the location where the parent domain was installed. There was a problem in that the measurement work became complicated as the electric field strength meter was carried around.

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 allows the friendly side to easily measure and display the received electric field strength during a radio wave transmission test.

[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, claim 1 of the present invention provides a plurality of child devices 12-1 to 1 to which a sensor 10 for detecting an abnormality such as a fire is connected and transmits an abnormality detection signal including address information when the sensor 10 generates an alarm.
2-n and individual indicator lamp groups 14-1 to 14-n arranged in correspondence with the number of slave devices, which receive transmission signals from the slave devices 12-1 to 12-n and notify abnormal conditions. The target is a wireless alarm system consisting of a main unit 16 that lights up a corresponding indicator light inside.

In claim 1, which is aimed at such a wireless alarm system, each of the slave units 12-1 to 12-n includes a test switch 18 for performing a radio wave transmission test, and the test switch 18 is operated. A test transmitting means 20 is provided for transmitting a test signal including address information when the parent device 16 receives the test signal from the child devices 12-1 to 12-n. The level of the individual indicator light group 14-
A test display means (24) for displaying numbers 1 to 14-n is provided.

Further, claim 2 of the present invention provides a plurality of slave devices 12-1 to 1 to which a sensor 10 for detecting an abnormality such as a fire is connected and transmits an abnormality detection signal including address information when the sensor 10 generates an alarm.
2-n, and an audio alarm section 26 that receives transmission signals from the slave devices 12-1 to 12-n and notifies abnormal conditions and acoustically notifies the abnormal information. Claim 2 of the present invention regarding a wireless alarm system such as
In this case, there is provided a test switch 18 for performing a radio wave transmission test on each of the slave devices 12-1 to 12n, and a test for transmitting a test signal including address information when the test switch 18 is operated. A transmitting means 20 is provided, and the goodwill 16 is configured to acoustically or vocally notify the receiving level by the audio alarm section 26 when receiving the test signal from the child devices 12-1 to 12-n. The test notifying means 28 is provided.

[Function] According to the wireless alarm system of the present invention having such a configuration, when the test switch provided on the slave unit is activated during a radio wave transmission test, the received electric field strength can be measured on the sharp instrument side for a certain period of time. The test signal was transmitted continuously over the above period, and the continuous reception of the transmitted radio waves was obtained for a sufficient period of time to measure the received field strength on the sharp instrument side, and the measured received field strength was already established at the Goodwill. The received electric field strength is displayed as an analog bar graph using a group of individual indicator lights indicating which slave unit has detected an abnormality, or the received electric field strength is notified by voice or acoustic output (musical scale), and the received electric field strength is measured using a field strength meter, etc. You can easily know the received electric field strength without needing a device.

[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 slave unit, each connected to a fire detector 10, and upon receiving a fire detection signal from the fire detector 10, transmits an abnormality detection signal including address information to the friendship 16 from the antenna 30.

In this embodiment, for one friendly device 16, up to eight slave devices 1
2-1 to 12-8 constitute one group, and each of the 436 MHz band frequency channels CHI to CH8, for example, is individually assigned to the eight slave units 12-1 to 12-8 included in the group. It is being

When the slave devices 12-1 to 12-n receive a fire detection signal from the fire detector 10, they transmit a fire detection signal including address information using a pre-assigned frequency channel,
This transmission operation consists of a fixed transmission period T1 = 3 seconds and an idle period T
Repeat for 2=2 seconds while the fire detection signal is obtained. In addition, as will be explained later, each of the slave devices 12-1 to 12-n is provided with a test switch, and when the test switch is activated, test information including address information is transmitted for a period T□=3 seconds. transmission, followed by a pause period T
2=The test transmission operation with a pause of 2 seconds is repeated while the test switch is activated.

On the other hand, the goodwill 16 receives the slave device 12-1 through the receiving antenna 32.
~12-n is being received, and for example, if the number of slave devices in one group is 8, the frequency channel CH
Carrier sensing is performed sequentially for I to CH8, and when carrier sensing is performed on a specific frequency channel, it locks to that frequency channel and performs reception processing. In this reception process, the received child device side address is compared with a preset sharp device side address, and if they match, the received data is decoded. If the received data is fire data, a fire alarm is displayed, while if it is test data, the received electric field strength is measured and displayed.

The front panel of the Goodwill 16 shows slave unit numbers 1 to 8 as shown in the diagram.
is displayed, and individual indicator lights 14-1 to 14-8 are provided to the left of slave device numbers 1 to 8 to indicate the slave device in which an abnormality has been detected. For example, change the slave device number of slave device 12-1 to 11.
When kL1 is set, upon reception of the abnormality detection signal from the slave device 12-1, the individual indicator light 14-1 on the left side of slave device number 1 lights up to indicate the slave device in which an abnormality has been detected. Further, a speaker is installed behind the sound hole 34 in the upper right corner of the parent house 16, and outputs an acoustic alarm when a fire is detected. Furthermore, 3
6 is a representative fire light.

Individual indicator lights 14-1 to 14- installed in this parent domain 16
In the present invention, the individual indicator light group 14 consisting of 8 is used as a means for displaying the received electric field strength.

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

In FIG. 2, 40 is a control unit composed of a modem and a CPU, and in addition to the function of transmitting an abnormality detection signal including address information when a fire is detected, the control unit 40 also has the function of transmitting an abnormality detection signal including address information when the test switch 18 is operated. It has a control function as a test transmitting means 20 that transmits signals. In addition, in order to prevent collisions caused by simultaneous transmission of child devices assigned the same frequency channel in other groups when transmitting the abnormality detection signal, the control unit 40 randomly sets a delay time at power-on start, and then It has a random delay transmission function that allows an abnormality detection signal to be transmitted every time.

FIG. 3 is a block diagram of an embodiment of a delay time setting circuit section provided in the control section 40 of FIG. 2, which randomly sets a delay time when an abnormal signal is detected.

In FIG. 3, an information table 42 provided in the control unit 40 stores a pseudo-randomized numerical value series of delay times as shown. In this embodiment, the delay time numerical series stores 0.2 seconds at address 000, 0.0 seconds at address 001, . . . 0.8 seconds at address 111.

The delay time setting section 44 accesses the information table 42 and reads out the delay time every time the control section 40 starts powering on and every time transmission ends after the power-on start. That is, the information table 42 corresponding to the initial address of the delay time setting unit 44 at power-on start reads out the delay time and outputs the delay time setting, and when the transmission ends after the set delay time has elapsed, the next address in the information table 42 is read out. The delay time is read out and set as a set output, and this delay time setting operation is repeated over the transmission period T1=3 seconds.

Referring again to FIG. 2, 46 is a fire receiving circuit to which the fire detector 10 is connected, and when the fire detector 10 generates an alarm, it receives the alarm signal via the power supply signal line 48 and outputs the fire detection signal. is output to the control section 40 and the starting circuit 50. When the starting circuit 50 receives the fire reception output, it turns on the power supply control circuit 52, supplies the power supply voltage from the battery power supply 54 to the control section 40, starts the power-on start, and performs the operation of transmitting the fire detection signal.

A test switch 18 is connected to the fire receiving circuit 46. The test switch 18 is, for example, a reed switch that is turned on by bringing a magnet close to it. That is, the reed switch 18 is provided inside the slave housing, and by bringing a magnet close to it from the outside, the reed switch 18
can be turned on to perform test operations.

When the test switch 18 is turned on, the fire receiving circuit 46 generates a reception output to the starting circuit 50, and when the power supply control circuit 52 is turned on, the battery power supply 54 is supplied to the control section 40 to start the power-on, and at the same time, the test reception signal is sent to the control section. Output to 40. The control unit 40, which receives the test reception signal from the activation of the test switch 18 via the fire reception circuit 46, transmits a test signal including address information by activating the test transmission means 20.

Reference numeral 55 denotes a periodic notification circuit, which uses a timer to output periodic notifications to the control unit 40 and the starting circuit 50 once every nine hours, for example, and transmits the periodic notification when the control unit 40 starts powering on by turning on the power supply control circuit 32. Have them do the action.

Furthermore, for the control unit 40, a group address setting device 5 is provided.
8. An individual address setter 60 and a non-volatile memory 62 are connected. The group address setter 58 sets a lower group address of a group address consisting of an upper address and a lower address. Note that the upper group address provided for expansion is stored in the nonvolatile memory 62.

The individual address setter 60 sets the individual address of the child device within the group.The non-volatile memory 62 is, for example, E2.
FROM is used and stores the first transmitted call code (ID code) approved by the Minister of Posts and Telecommunications. That is, specified low-power radio stations under the Radio Law are required to send a call code at the beginning of transmission. Furthermore, the nonvolatile memory 62 stores upper group addresses for providing expandability to the group addresses.

A transmitting RF unit 64 performs MSK modulation on a carrier signal of a frequency channel assigned to a child device using, for example, transmission data from the control unit 40 and transmits the modulated signal from the transmitting antenna 30.

FIG. 4 is a timing chart showing the continuous transmission operation when a fire is detected in the slave device embodiment of FIG. 2. When a fire detector fires an alarm, a call code is first transmitted. This call code has the format shown in FIG. When the transmission of the call code is completed, the transmission of the synchronization signal and the information code is repeated for a transmission period T1 = 3 seconds every time the randomly set delay time Tdl, Ta2°Ta3 elapses, and then there is a pause of 1222 seconds, Repeat this.

The synchronization signal is data in which all 1's are continuous, and the information code is composed of, for example, four frames 1 to 4 shown in FIG.

In FIG. 6, the first start bit O and the last stop bit 1 of frames 1 to 4 are provided for frame synchronization. An 8-bit data area is provided following start bit 0, in frame 1 the upper group address is sent, in frame 2 the individual address and lower group address are sent, in frame 3 a fire detection signal is sent, and In frame 4, horizontal parity bits are sent.

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

When sending out a test signal, the fire detection signal of frame 3 is replaced with the test signal. Of course, other appropriate methods may be adopted as the transmission frame.

Next, the transmission operation in the child device of FIG. 2 will be explained with reference to the operation flow diagram of FIG. 7.

Assuming that the fire detector 10 has triggered an alarm, the activation circuit 50 is activated by the received output of the fire reception circuit 46, turns on the power supply control circuit 52, supplies power to the control unit 40 from the battery power supply 54, and controls the Due to the power-on start of Section 40, the 7th
The operation flow shown in the figure is executed.

In FIG. 7, first step S1 (hereinafter "step")
(omitted) determines whether it is a fire or a test (examination), and since it is a fire, the process proceeds to 82 and first transmits a call code. Next, in S3, the process waits for the lander delay time set according to FIG. 3 to elapse, and then proceeds to S4, where a fire detection signal is transmitted. Next, the process proceeds to S5, where it is checked whether T=3 seconds have elapsed since the start of the transmission, and the transmission operations from 82 to S5 are repeated until 3 seconds have elapsed.

When it is determined in S5 that T,=3 seconds have passed since the start of transmission, S
After proceeding to step 6 and pausing for 1222 seconds, it is checked in step S7 whether or not a fire signal is being received. If a fire signal is being received, the process returns to step S2 and the same fire detection signal transmission operation is repeated. If it is determined in S7 that the fire detection signal has been cut off, the process proceeds to 88, where a power-off process is performed to cut off the power supply to S8, thereby completing the series of transmission operations.

On the other hand, when the control unit 40 is powered on by operation of the test switch 18, a test is determined in Sl, and the process proceeds to S9 and subsequent steps. That is, a call code is first transmitted in S9, and then a test signal is transmitted in SIO. Subsequently, Sll checks whether T,=3 seconds have elapsed since the start of transmission, and continuous transmission of test signals by Sll from 89 to Sll is continued until 3 seconds have elapsed. When it is determined in Sll that 3 seconds have elapsed, there is a pause of T2=2 seconds at 312, and then S13
It is checked whether the test switch is turned off or not, and if the test switch is turned on, the process returns to S9 to continue transmitting the same test signal. S1 if the test switch is off
The process proceeds from step 3 to power-off step 88, and the series of processing ends.

FIG. 8 is a block diagram of an embodiment of the parent domain 16 shown in FIG.

In FIG. 8, 70 is a modem, and eight frequency channels CHI to CH8 are assigned to slave devices for the received signal by the receiving antenna 32 of the receiving RF unit 72.
Carrier sense is performed by switching sequentially. When a received signal is obtained on a specific frequency channel in this carrier sense, that is, when a carrier sense output is obtained, the receiver locks on the reception state of that frequency channel, takes in the received signal, and performs reception processing. In this reception process, the address is checked against the parent address set by the parent address setting device 76 for the modem 70, and when an address match is obtained, it is output to the data latch circuit 78 to be latched, and the cPU is used. The control unit 80 is caused to perform data processing.

The parent address setter 76 sets a group address (upper and lower) indicating a group and individual addresses of eight child devices belonging to the group.

The control unit 80 decodes the received data taken in via the data latch circuit 78, and if it is fire detection data, lights up the representative fire light 36 by the alarm display circuit 82, and also lights up the representative fire light 36 by the alarm display circuit 82, and also lights up the representative fire light 36 by the alarm display circuit 82 and displays the individual displays constituting the individual display group 14. Vessels 14-1 to 14-
8. Light up the corresponding indicator light. At the same time, the audio alarm circuit 2
6 to output an alarm sound or an alarm message from the speaker 84.

Furthermore, for the data latch circuit 78, an idle line setting device 8 is provided.
If the setting output of modem 7 is given and an empty line is set as a frequency line corresponding to an unused slave unit, modem 7
0 and the control unit 80 exclude the set idle line from processing targets.

In the present invention, with such a configuration, the control section 80 is provided with a control function as the test display means 24 and a control function as the test notification means 28. That is, when the test display means 24 receives the test signal from the slave device, the test display means 24
It has a function of reading the reception level corresponding to the reception electric field strength obtained from the unit 72 and displaying the reception level by the individual indicator lamp group 14 by driving the reception level display circuit 22. On the other hand, the test notification means 28 reads the reception level corresponding to the reception field strength obtained from the receiving RF unit 74 when receiving the test signal from the slave device, and uses the audio alarm circuit 26 to output an acoustic or vocal signal from the speaker 84. It has a function to notify the reception level.

FIG. 9 is an operational flow diagram of the parent domain shown in FIG.

In Fig. 9, when the parent domain is powered on, initial settings such as idle line setting and address setting are performed on the Sl, and after the initial settings are completed, the reception is monitored by carrier sense of 82 slave frequency channels CHI to CH8. Then, every time carrier sense is detected, the process advances to 83 to check whether data is being received.

When a carrier sense output is obtained in a specific frequency channel in S3, data reception is determined and the process proceeds to S4, where the address of the received data is verified. If a match is found between the received address and the parent address in the address verification in S4, the process proceeds to 85, where the received data is decoded. If it is determined that there is a fire based on the received data decoded in S6, the process proceeds to S7, and the alarm display circuit 82
The representative fire light 36 is turned on and the individual indicator light group 1 is turned on.
Turn on the corresponding individual indicator light in 4.

On the other hand, if the test is determined in S6, the process advances to S8, reads the reception level corresponding to the reception field strength level obtained from the reception RF unit 72 at that time, and displays the read reception level on the test display means 24. The signal is outputted to the reception level display circuit 22, and the reception level is displayed in bar graph form using the individual indicator light group 14. That is, as shown in FIGS. 10(a) to 10(c), for the eight individual indicator lights arranged as shown in FIG. 1 corresponding to the eight child devices,
A display operation is performed in which the number of individual indicator lamps lit is increased in proportion to the strength of the electric field.

On the other hand, in the test notification means 28, the audio alarm circuit 26
is driven, and the level of the received electric field strength is acoustically outputted from the speaker 84 according to the musical scale of, for example, "Do Re Mi Fa So Racido." For example, the electric field intensity is set to ``low, middle, and high'' in response to the musical scale ``Do Re Mi Fa Solashido,'' and an acoustic output indicates that the higher the scale, the stronger the electric field strength is. The acoustic output indicating the electric field strength may be a single note of the scale corresponding to the electric field strength, or the electric field strength may be, for example, "so".
If the system is compatible with this, the sound output may be output in a continuous scale such as "do-re-mi-fa-so".

Further, the strength of the electric field may be notified by a voice message using voice synthesis.

Here, since the display of the reception level by using the individual indicator light group 14 when receiving the test signal overlaps with the individual display of the slave unit by the alarm display circuit 82, the reception level display circuit 22
When the electric field strength is displayed by the alarm display circuit 82, individual display of slave devices is prohibited. It is desirable that this state of prohibition of individual display can be canceled by an appropriate operation switch.

In addition, by ANDing the individual display output from the alarm display circuit 82 and the level display output from the reception level display circuit 22 and blinking the individual display lamp corresponding to the AND output, the individual display and level display can be performed simultaneously. can be set. Note that the friendship 16 may be provided with either the test display means 24 or the test notification means 28.

In addition, in the above embodiment, the case where a fire detector is connected to the slave unit is taken as an example, but in addition to this, an appropriate abnormality detector such as a gas leak detector or an intruder detector may also be connected. You may also connect it.

[Effects of the Invention] As explained above, according to the present invention, when a test signal is transmitted by actuation of a test switch of a slave device, an abnormality detector already installed is detected when the test signal is received on the device side. The received electric field strength is displayed using a group of individual indicator lights, for example, as an analog bar, or the received electric field strength is notified by voice or acoustic output (musical scale), which requires a measuring device such as a field strength meter. It is possible to easily and reliably know the received electric field strength on the equipment side without any trouble.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram of the present invention; FIG. 2 is an embodiment configuration diagram of the slave unit of the present invention; FIG. 3 is an embodiment configuration diagram of the random delay time setting circuit section of the present invention; Transmission timing chart of slave device of invention; 5th
The figure is a format configuration diagram of a call identification code transmitted from the slave unit of the present invention; 6rIA is a format diagram of a transmission code transmitted from the slave unit of the present invention; Figure 7 shows the transmission operation of the slave unit of the present invention. Fig. 8 is a configuration diagram of an embodiment of goodwill according to the present invention; Fig. 9 is an operation flow diagram showing the receiving operation of goodwill according to the present invention; Fig. 10 is a group of individual indicator lights for goodwill according to the present invention. FIG. 3 is an explanatory diagram of a reception level display operation using the . In the figure, 10: Fire detector 12.12-1 to 12-n: Child device 14: Individual indicator light group 14-1 to 14-8: Individual indicator light 16: Goodwill 18: Test switch 20: Test transmission means 22 : Reception level display circuit 24: Test display means 26; Audio alarm circuit 28: Test notification means 30: Transmission antenna 32: Receiving antenna 34: Sound hole 36 Two representative fire lights 40: Control unit 42: Information table 44: Delay time setting Part 46: Fire reception circuit 48: Power supply signal line 50: Starting circuit 52: Power supply control circuit 54: Battery power supply 55: Periodic notification circuit 58 Nigel loop address setter 60: Individual address setter 62: Non-volatile memory (E2 PROM )64: Send R
F unit 70: Modem 72: Receiving RF unit 76: Parent address setting device 78: Data latch circuit 80: Control unit (CPU) 82: Alarm display circuit 84: Speaker 86: Idle line setting device

Claims (1)

[Scope of Claims] 1. A plurality of slave devices to which a sensor for detecting an abnormality such as a fire is connected and transmits an abnormality detection signal including address information when the sensor generates an alarm, and a signal transmitted from the slave device. In a wireless alarm system consisting of a parent unit that receives a signal and notifies an abnormal state and lights up a corresponding indicator light in a group of individual indicator lights arranged corresponding to the number of slave units, the wireless alarm system comprises: Each of them is provided with a test switch that performs a radio wave transmission test, and a test transmission means that transmits a test signal including address information when the test switch is operated, and the base device is tested from the child device. A wireless alarm system comprising test display means for displaying a reception level using the group of individual indicator lights when a signal is received. 2. A plurality of slave devices connected to a sensor that detects an abnormality such as a fire, transmits an abnormality detection signal including address information when the sensor generates an alarm, and detects an abnormal state by receiving the transmission signal from the slave device. In a wireless alarm system comprising a master device equipped with an audio alarm unit that notifies abnormality information and acoustically notifies the abnormality information, a test switch that performs a radio wave transmission test on each of the slave devices; and a test transmitting means for transmitting a test signal including address information when the test switch is operated, and when the parent device receives the test signal from the child device, the receiving level is transmitted to the audio alarm section. What is claimed is: 1. A wireless alarm system characterized by being provided with test notification means for acoustically or audibly providing notification.