JP2840346B2 - 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, in order to monitor a fire at a building site such as a building, a child unit having an externally attached fire detector is installed on the ceiling side of a guard area, and when a fire signal is obtained from the fire detector. A wireless alarm system has been proposed in which an abnormality detection signal is transmitted wirelessly to a parent device to notify an abnormality. Note that the slave unit has a built-in battery power source, and can be freely installed at a required place.

In such a wireless alarm system, for example, six frequency channels are allocated to the slaves, and at the time of transmission, the slaves are first set to the receiving state, and carrier sense is sequentially performed in the order of the transmission channels CH1 to CH6. Select an empty channel that is not used in the slave unit. Next, the slave is switched to the transmission state, and the abnormality detection information is transmitted to the master using the empty channel selected by the carrier sense.

On the other hand, in the parent device, the same six frequency channels as those of the child device are allocated, and the carrier sense of the six channels is always performed sequentially. And decodes the transmitted signal to alert an abnormal condition.

Also, for example, eight slave units can be provided for one master unit, and a unique individual address is set for each slave unit,
The individual address is transmitted together with the abnormality detection signal. For this address transmission, the same address setting as the individual address of the slave unit is performed on the master unit. When a signal from the slave unit is received, the address is collated first, and when a match is obtained, the received information is decoded. And give an alarm.

Furthermore, when more than eight slave units are installed on the same floor, etc., one master unit and a maximum of eight slave units constitute a group, and each slave unit and the master unit have an individual address added. A group address is set by using the same six channels for each group, so that transmission can be monitored for each group without interference.

[Problems to be Solved by the Invention] However, in the conventional wireless alarm system provided with such a group address, all the group addresses set by the parent device and the child device belonging to the same group have the same address number. There are relatively few setting mistakes. However, the individual address of the slave unit is different for each slave unit, and all the slave units must be set in the master unit. Therefore, an individual address setting error is likely to occur. Even when the abnormality detection information is transmitted from the slave unit, the reception processing is not performed due to the address mismatch, so that the transmission signal is ignored and the alarm cannot be performed.

The present invention has been made in view of such a conventional problem, and provides a wireless alarm system in which an address abnormality such as an address setting error is determined and notified by a reception process on a base unit side. With the goal.

[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 connects a detector 10 that detects an abnormal situation, a slave 12 that wirelessly transmits information based on an abnormality detection signal from the detector 10, and receives and decodes a signal transmitted from the slave 12. The present invention is directed to a wireless alarm system including a base unit 14 that issues an alarm.

According to the present invention for such a wireless alarm system, a group address setting means 18 for setting a group address in the slave 12 with one master and one or more slaves as one group is provided. An individual address setting means 16 for setting an individual address unique to a slave unit, and a transmission control means 20 for transmitting the group address and the individual address together with information based on an abnormality detection signal or the like.

On the other hand, the parent device 14 has first address determination means 70-1 for determining whether or not a group address received from the child device 12 matches a preset address, and an individual address received from the child device 12. Address determination means 70-2 for determining whether or not the address matches any of a plurality of preset individual addresses; and the first and second address determination means 70
When a discrimination output of address coincidence is obtained from both of the first and the second address discriminating units 70-1 and 70-2, the reception control unit 72 decodes the received information and individually displays the result. And a failure determining means 120 for notifying of an address failure when an individual address matching determination output is not obtained from the second address determining means 70-2 even if the determination output of .

[Operation] According to the wireless alarm system of the present invention having such a configuration, if there is an error in setting the individual address in the parent device and / or the child device, the error from the child device at the time of abnormality detection or periodic notification is made. The address failure is determined by the reception operation of the parent device with respect to the transmission, and an alarm is displayed, so that it is possible to know the address abnormality and respond appropriately.

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

In FIG. 1, reference numerals 14-1 to 14-m denote master units, each of which has a plurality of slave units 12-1 to 12-n. One group includes one master unit and a plurality of slave units. doing.

Each of the slave units 12-1 to 12-n has a power / signal line 10
The fire detector 10 is connected to the main unit 14-1 via the antenna 22, and the fire detector 10 transmits a fire detection information together with a preset group address and an individual address when the fire detector 10 issues an alarm.

Here, the slave units 12-1 to 12-n have, for example, six 429 MHz bands.
One of the transmission channels CH1 to CH6 is allocated.Before transmission, first, the mobile terminal goes into a reception state, performs a carrier sense operation for searching for an unused channel not used by another slave unit, and selects an empty channel to perform a transmission operation. Then, fire detection information is transmitted together with the group address and the individual address. The slaves 12-1 to 12-n are provided at regular intervals,
For example, a function is provided to perform periodic notification once every 9 hours, and a periodic notification operation for transmitting periodic notification information to the parent device together with the group address and the individual address is performed once every 9 hours even in the regular monitoring state. It is.

The individual addresses of a plurality of slaves belonging to the same group as the group address are set in advance on the masters 14-1 to 14-m side. The base units 14-1 to 14-m sequentially repeat carrier sense of the transmission channels CH1 to CH6 allocated to the slave unit in the steady monitoring state, and when a carrier is detected in a specific channel, the base unit 14-1 to 14-m enters the reception state. Fixedly receive the transmission information from the slave unit. The processing of the information received from the slave unit
First, an address check is performed to determine whether each of the group address and the individual address received from the slave unit matches an address preset on the master unit side. If the match between the group address and the individual address is determined, the received information is decoded, and if it is fire detection information, an alarm is displayed.
If it is the periodic report information, the timer counter that outputs the abnormal signal of the periodic report is cleared. That is, in the case of the periodic notification, when the periodic notification information is not received within a predetermined time due to an abnormality on the slave unit side, a periodic notification abnormality alarm is issued.

Further, in the present invention, when the master units 14-1 to 14-m receive the transmission signal from the slave unit and determine the address, an address match is obtained by collation of the group address, but the individual address is determined. If no match is found in the comparison, an address failure is reported as an abnormal setting of the individual address, for example, a setting error. The address fault display is performed by an address fault indicator 90 provided in the master units 14-1 to 14-m. The master units 14-1 to 14-m are provided with individual fire indicators 74-1 and 74-2.
The fire occurrence of the report and the second report can be individually displayed together with the slave unit address and the like.

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

In FIG. 2, the slave unit 14 is provided with a CPU 24.
The transmission control unit 20 is configured by the above program control. CP
An individual address setting device 16 and a group address setting device 18 are provided for U24. The group address setting device 18 sets a group address in which one parent device and one or more child devices are grouped as one group. The individual address setting unit 16 sets an individual address unique to a slave belonging to the same group. As the individual address setting device 16 and the group address setting device 18, a rotary type DIP switch having a dial displaying numerical values of 0 to 9 can be used.

28 is a fire receiving circuit to which the fire detector 10 is connected,
When the fire detector 10 issues an alarm, a reception output is generated to the CPU 24 and the activation circuit 30. Upon receiving the received output, the activation circuit 30 activates the power supply control circuit 32, supplies power from the battery power supply 25 to the CPU 24, starts power-on, and starts the transmission operation by the transmission control unit 20.

The transmission operation by the transmission control unit 20 first performs a carrier sense process of searching for a free channel among the channels CH1 to CH6 with the slave set in a reception state, and switches to a transmission operation when a free channel is selected by carrier sense. The fire detection information is transmitted together with the individual address and the group address.

Furthermore, for the CPU 24, the non-volatile memory 35 and the periodic notification circuit 3
6 is provided. The nonvolatile memory 35 stores a system-specific call identification code (ID code) authorized by the Minister of Posts and Telecommunications. 20
, The call identification code is transmitted at the beginning of the transmission operation. According to the Radio Law, this call identification code is required to be transmitted first when radio transmission is performed by a specific low power radio station. It is needless to say that other appropriate transmission formats can be adopted for weak radio waves and the like. The periodic notification circuit 36 outputs a periodic notification output to the CPU 24 and the start-up circuit 30 by a timer, for example, once every nine hours, operates the transmission control unit 20 by the power-on start of the CPU 24, and outputs the periodic notification information together with the individual address and the group address. Is sent.

On the left side of the CPU 24, a receiving circuit unit for carrier sense and a transmitting circuit unit for transmitting information are provided.

In this transmission / reception circuit, reference numeral 40 denotes a synthesizer circuit, which oscillates a local oscillation frequency fr of any one of the channels CH1 to CH6 at the time of carrier sensing in a reception state, and channels CH1 to C at the time of transmission operation after carrier sensing.
Oscillates any carrier frequency ft of H6. The synthesizer circuit 40 includes a PLL circuit 42 and a VCO (voltage controlled oscillator) 44
And an amplifier 46. The oscillation frequency of VCO44 is CPU24
Can be changed freely by setting the frequency division ratio data. Note that the CPU 24 performs PLL by setting the frequency division ratio data.
A normal operation can be confirmed by receiving a lock detection in a state where the circuit 42 is locked to a predetermined oscillation frequency.

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 transmission circuit 50 is provided to the antenna 22 via the antenna switch 52, and the other of the antenna switch 52 is input to the high frequency amplification / mixing circuit 54. The high frequency amplifying / mixing circuit 54 is used for the synthesizer circuit 40 during carrier sensing.
Local oscillation frequency fr of any of channels CH1 to CH6
Then, the received signal is frequency-converted and an intermediate frequency fi signal is output. Here, the carrier frequency ft1 of the channel CH1
Is 429.175 MHz, and the intermediate frequency fi output from the high-frequency amplification / mixing circuit 54 is 21.7 MHz, and the carrier circuit 407.475 M
A local oscillation frequency fr in Hz is provided.

The intermediate frequency amplification / mixing circuit 56 further converts the frequency of the intermediate frequency signal of 21.7 MHz and outputs an intermediate frequency signal of 455 KHz. Such a method of performing frequency conversion twice by the high frequency amplification / mixing circuit 54 and the intermediate frequency amplification / mixing circuit 56 is known as a double superheterodyne method.

The output of the intermediate frequency amplification / mixing circuit 56 is a carrier detection circuit
58 and MSK modem 60. Carrier detection circuit 58
Has a threshold based on the white noise level when there is no carrier, and provides a detection output of no carrier below the threshold and a detection output of carrier present to the CPU 24 when the threshold is exceeded.

The MSK modem 60 modulates and demodulates the data bit 1 to 1200 Hz and the data bit 0 to 1800 Hz, for example. That is, the frequency signal received from the master unit is demodulated into data bits 1 or 0 by the MSK modem 60 and is provided to the CPU 24. Also, the data bit of the transmission data from CPU 24
The MSK modem 60 converts 1,0 into a 1200 Hz or 1800 Hz frequency signal, which is supplied to the VCO 44 provided in the synthesizer circuit 40. The carrier frequency at that time is MSK modulated and transmitted.

Reference numeral 62 denotes a power supply switching circuit which switches on and off the power supply to the reception circuit unit and the transmission circuit unit under the control of the CPU 24 to switch between the transmission operation and the reception operation. That is, immediately after the CPU 24 starts power-on, the power supply to the reception circuit unit is turned on to perform carrier sense, and when an empty channel is selected by carrier sense, the power supply to the reception circuit unit is turned off and then the power supply to the transmission circuit unit. The supply is turned on to perform the transmission operation. That is, in this embodiment, switching between the transmission operation and the reception operation is performed by turning on / off the power supply. Accordingly, the signal switch 48 and the antenna switch 52 are switched by the power supply so as to enable the circuit section in the operating state.

FIG. 3 is a timing chart showing a transmission operation when the fire detector 10 issues an alarm in the slave unit embodiment of FIG.

When the fire detector 10 gives an alarm, the start-up circuit 30 activates the power supply control circuit 32 by the fire reception output of the fire reception circuit 28, starts the CPU 24 with the power supply from the battery power supply 25, and transmits by the transmission control unit 20. Start the operation. In this transmission operation, first, the frequency division ratio data for oscillating the local oscillation frequency of the channel CH1 for carrier sensing is set in the PLL circuit 42, and then the power supply to the reception circuit unit is turned on by the power supply switching circuit 62 to receive the data. The operation state is set, and the presence or absence of the output of the carrier detection circuit 58 is checked. If there is no carrier detection output, channel CH1 is selected as an empty channel, and if carrier detection output is obtained, the next channel is selected.
Switch to CH2 carrier sense. Note that the carrier sense is performed for a delay time set randomly for each slave unit, so that interference due to simultaneous alarm can be prevented.

When an empty channel is selected by carrier sense,
The division ratio data for the PLL circuit 42 is set so as to oscillate the carrier frequency of the selected free channel, and then the power supply to the transmission circuit unit is turned on by the power supply switching circuit 62. This transmission operation is performed at T1 as shown in FIG.
= 8 seconds transmission period and T2 = 2 seconds pause period, and if fire reception continues at the end of the 2 second pause period,
The same operation is repeated from carrier sense again.

At the beginning of the 8-second transmission period, a call identification code (ID code) unique to the system, which has been approved by the Minister of Posts and Telecommunications, is transmitted. This paging identification code has the format configuration shown in FIG. 4, and is read out from the nonvolatile memory 35 of the 63-bit paging identification code of the fourth frame and transmitted together with bit synchronization and frame synchronization.

When the transmission of the call identification code is completed, the mark and the transmission code are transmitted alternately a plurality of times, for example, 75 times. The mark is data in which 1s are continuous, and the transmission code is composed of, for example, four frames 1 to 4 shown in FIG.

In FIG. 5, the first start bit 0 and the last stop bit 1 of frames 1 to 4 are provided for frame synchronization. Eight bits following the start bit are a data area, a group address (upper) is set in frame 1, an individual address and a group address (lower) are set in frame 2, and an alarm signal is set in frame 3. You. The data area of the last frame 4 is a horizontal parity bit, and the parity bit is set so that the sum of the same bit positions in frames 1 to 3 is an odd number, for example.

Parity bits following the data area of frames 1 to 4 are used for parity check for each frame. At the time of the periodic notification, the alarm signal of frame 3 becomes the periodic notification information.

Sixth Embodiment FIG. 6 is an embodiment configuration diagram showing one embodiment of the parent device of the present invention.

In FIG. 6, the base unit 14 is provided with a CPU 64,
The address control unit 70 and the reception control unit 72 are configured by the program control described above. First, a group address setter 66 and an individual address setter 68 are provided for the CPU 64.
One group address and individual addresses of a plurality of slaves belonging to the same group are set.

For the CPU 64, a receiving circuit unit including an antenna 74, a receiving circuit 76, an MSK modem 78, and a synthesizer circuit 80 is provided. This receiving circuit section has the same circuit configuration as that of the transmitting / receiving circuit of the slave unit shown in FIG. 2 except for the transmitting circuit section side.

The reception control unit 72 of the CPU 64 changes the setting of the frequency division ratio data for sequentially oscillating the local oscillation frequency of the channels CH1 to CH6 for the synthesizer circuit 80, thereby changing the reception circuit.
At 76, the carrier sense of the channels CH1 to CH6 is sequentially repeated. When the carrier sense output is obtained from the receiving circuit 76, the frequency division ratio data set for the synthesizer circuit 80 is fixed, the receiving state of the channel on which carrier sensing is performed is fixed, and the data bit is sent from the MSK modem 78.
Take in the received data converted to 1,0. The reception control unit 72 that has received the reception data gives the received group address and individual address to the address discrimination unit 70, and performs an address collation process.

FIG. 7 is a block diagram showing an embodiment in which the address discriminating section 70 of FIG. 6 is represented by functional blocks.

In FIG. 7, reference numerals 100, 102 and 106 denote registers, 108 denotes a memory table, 104 and 112 denote comparators, 114 denotes an AND gate, and 120 denotes a fault judging unit constituted by an AND gate 116 having one inverted input.

In FIG. 7, a first discriminating unit 70-1 compares a reception group address stored in a register 100 with a set group address stored in a register 102 by a comparator 104. Is generated.

The second determination unit 70-2 takes out the receiving-side individual address 106 stored in the register and the plurality of individual addresses 1 to n stored in the memory table 108 one by one by the multiplexer 110 and compares them by the comparator 112. , A high level output is generated. In the address determination, the processing of the first determination unit 70-1 is performed first, and then the processing of the second determination unit 70-2 is performed.

The outputs of the comparators 104 and 112 are supplied to an AND gate 114, and when a coincidence output of both the group address and the individual address is obtained, the AND gate 114 supplies an H level output that becomes an address coincidence to the reception control unit of FIG. Receiving the H level output from the AND gate 114, the reception control unit 72
That is, the decoding process of the data area of the frame 3 shown in FIG. 5 is performed.

On the other hand, the output of the comparator 104 on the group address side is directly input to one of the AND gates 116 provided in the fault determination unit 120, and the output of the comparator 112 on the individual address side is inverted. Therefore, when an H-level output is obtained when the group address matches, and an L-level output is obtained as a mismatch output in discriminating the individual address, the AND gate 116 generates an H-level output to indicate an address failure.

Referring again to FIG. 6, the display circuit 7
5, individual fire indicators 74-1 and 74-2, an address fault indicator 90, and a fire indicator 77 are provided. The individual fire indicators 74-1 and 74-2 detect a fire according to the result of decoding the reception information of the reception control unit 72 when the coincidence output of both the group address and the individual address is obtained in the address discrimination in FIG. For example, the performed slave unit address is individually displayed, the fire indicator lamp 77 is turned on at the same time, and an alarm buzzer (not shown) is sounded. The parent device 14 is connected to a signal line 82 via a transfer circuit 86.
Thus, the information can be output to the receiver 84 such as a fire alarm system, and the receiver 84 can also issue a fire alarm.

The address failure indicator 90 displays an address failure in the failure determination unit 120 shown in FIG. 7 when an address failure, that is, when the group addresses match but the individual addresses do not match.

If an address fault is displayed on the address fault indicator 90 in the base unit 14, then there is an error in the setting of the individual address in the slave unit performing the transmission operation, or the setting of the individual address on the slave unit side. Is correct, it means that there is an error in the setting of the individual address in the base unit 14, and the individual address is checked according to the address failure indication to correct the address.

Such an address failure display is not performed at the time of receiving the alarm by the sensor notification, but at the time of receiving the periodic notification from the periodic notification circuit 36 shown in FIG. 2 once every 9 hours.
This will normally be done.

In the above embodiment, the case where the fire detector is connected to the slave unit is taken as an example. In addition, a proper abnormality detector such as a gas leak detector or an intruder detector may be used. You may connect.

[Effects of the Invention] As described above, according to the present invention, if there is an individual address setting error or an error in the address setting circuit in the parent device and / or the child device, the child device at the time of abnormality detection, periodic notification, etc. An address failure is determined and notified by the reception operation of the base unit with respect to the transmission from the communication device, and a highly reliable alarm system can be constructed by knowing the address abnormality and appropriately responding.

[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. FIG. 4 is a configuration diagram of an embodiment of an address determination unit in the parent device of the present invention. In the figure, 10: fire detector 12, 12-1 to 12-n: slave unit 14-1 to 14-m: master unit 16: individual address setting unit 18: group address setting unit 20: transmission control unit 22, 74 : Antenna 24,64: CPU 25: Battery power supply 28: Fire receiving circuit 30: Start-up circuit 32: Power supply control circuit 35: Non-volatile memory (EEPROM) 36: Periodical notification circuit 40,80: Synthesizer circuit 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, 78: MSK modem 62: Power supply switching circuit 66: Group address setting device 68: Individual address setting unit 70: Address discriminating unit 70-1: First address discriminating unit 70-2: Second address discriminating unit 72: Reception control unit 74-1, 74-2: Individual fire display unit 75: Display circuit 76: Receiving circuit 84: Receiver 86: Notification circuit 90: Address fault indicator 100, 102, 106: Register 104, 112: Comparator 108: Memory table 110: Multiplexer 114, 116: AND Gate 120: Failure determination unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G08B 29/06 G08B 25/10

Claims (1)

(57) [Claims] 1. A slave unit connected to a detector for detecting an abnormal situation, wirelessly transmitting information based on an abnormality detection signal from the detector, and receiving and decoding a radio signal transmitted from the slave unit to generate an alarm. And a group address setting means for setting a group address of the base unit with one base unit and one or more base units as one group. An individual address setting unit for setting an individual address unique to a slave unit, and a transmission control unit for transmitting the group address and the individual address together with the information are provided. The master unit receives a group address received from the slave unit in advance. The first to determine whether it matches the set address
Address discriminating means, second address discriminating means for discriminating whether or not the individual address received from the slave unit matches any of a plurality of preset individual addresses;
Receiving control means for decoding received information when individual address matching judgment outputs are obtained from both the first and second address judgment means and individually displaying the results; and obtaining a group address matching judgment output from the first address judgment means. And a failure determining means for notifying an address failure when an individual address match determination output is not obtained from the second address determining means. Tem.