JPH0377702B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention comprises a plurality of slave units for intruder detection, and a master unit that centrally monitors the slave units via a power line,
In the event of an abnormality in which the handset detects an intruder, the handset sends an intrusion error signal to the base unit, and under normal conditions, the base unit checks each slave unit for a certain period of time to determine whether or not the handset is in a state where it can detect an intruder. The present invention relates to a method of monitoring a communication line between a base unit and a slave unit by sequentially polling at intervals.

Problems with the conventional technology There are two types of conventional alarm monitoring systems of this type: a random method and a polling method. In the former random method, a slave unit that detects an intruder unilaterally detects an intruder without being concerned about other slave units. Since the intrusion abnormality signal was sent to each slave unit, a collision of the intrusion abnormality signals occurred between the slave units, resulting in a drawback that the function as an alarm monitoring system could not be properly performed. In order to avoid this signal collision, the latter polling method polls multiple handsets in sequence, and only when a handset receives this polling can the same handset send an intrusion error signal. However, even if the child unit detects an abnormality, the system does not immediately send the message to the parent unit, so it lacks quick response.

Purpose of the Invention The present invention solves the above-mentioned drawbacks of the conventional system in an alarm monitoring system using two-way communication using electric power lines, and eliminates signal collision between slave units and signal collision between slave units and base unit. An object of the present invention is to provide an abnormality monitoring method that prevents the above-mentioned two-way communication from occurring in an appropriate and responsive manner.

Embodiment of the Invention Fig. 1 is a circuit block diagram of an alarm monitoring system with two-wire bidirectional communication using power lines, in which 2 is an AC 100V commercial power line used as a signal transmission path; A block filter that prevents signals from leaking outside the alarm monitoring system, 4 is the main unit, 5a, 5b, 5c...5n (hereinafter simply referred to as 5) are slave units with built-in sensors, and 6 is an additional buzzer unit. The main unit 4, slave unit 5, and additional buzzer unit 6 are connected to the power line 2 via a connector 3 consisting of, for example, a plug and an outlet. 7 sends information from the base unit 4 to the outside,
That is, it is a telephone line that sends out to the monitoring center, and 8 is a telephone connected to this telephone line 7.

When the above-mentioned handset 5 is installed in an opening in a building, for example, and an intruder is detected by the sensor built into the handset 5, the handset 5 sends out an intrusion abnormal signal and transmits the signal via the power line 2. The signal is sent to the base unit 4, which causes the buzzer of the base unit 4 and the buzzer of the additional buzzer unit 6 to sound, and at the same time lights up the lamp representing the slave unit that has transmitted the intrusion abnormality signal. In this case, the base unit 4 can notify the monitoring center via the telephone line 7 if necessary.

FIG. 2 is a circuit block diagram of the base unit 4. In the figure, the intrusion abnormality signal sent from the slave unit 5 via the power line 2 is superimposed on AC 50Hz or 60Hz, so the PLC transmitting/receiving unit 4e sends the signal. Only the component is extracted, converted into a pulse signal by an encoder/decoder 4d, and then sent via an input/output interface 4c.
It is taken into CPU-A and CPU-B.

ROM4f contains the CPU-A, for example, slave unit 5,
Operation programs such as transmission and reception between the base units 4 are stored, and the ROM 4p stores operation programs such as an automatic call function to the telephone line 7 of the CPU-B.

The operating section 4a is a membrane switch, and includes a numeric keypad for a password, an operation mode setting switch, a warning switch for each sensor, and the like. The display section 4a' identifies and displays the type of alarm and which handset has been activated.

When the notification mode is set by operating the operation unit 4a, or when an intrusion abnormality signal is sent from the handset and reported to the monitoring center via the telephone line 7,
The automatic call function is configured to operate via the input/output interface 4c of the CPU-B. The MF signal generation section 4j is an oscillator for converting the pulse code into a two-frequency signal, and the MODEM section 4k
is a signal modulation section, and a line connection section 4m controls switching between connecting the telephone line 7 to the base unit 4 and the telephone set 8, and has a contact point for a relay 4n. 4b is an interface including a display key switch, and 4h is a power supply.

In order to report to the monitoring center, the telephone line 7 is switched from the telephone 8 to the base unit 4, the monitoring center is automatically dialed, the information is sent as an MF signal, and the acceptance signal from the monitoring center is received by the answer signal receiving unit 4l. Receive.

FIG. 3 is a circuit block diagram of the handset 5, and since the handset monitoring signal sent from the base unit 4 via the power line 2 is superimposed on AC 50Hz or 60Hz,
The PLC transmitter/receiver 10 extracts only the signal component,
The encoder/decoder 11 converts the pulse signal into a pulse signal, which is then input to the CPU via the input/output interface 12.

On the other hand, when the built-in sensor 13 in the handset 5 operates, its output signal, an intrusion abnormality signal, is taken into the CPU via the input/output interface 14.
It is converted into a pulse signal by the encoder/decoder 11, modulated by the PLC transmitter/receiver 10, superimposed on the AC 50Hz or 60Hx of the power line 2, and sent to the base unit 4. 15 is a ROM in which a CPU operating program is stored, and 16 is a power supply.

FIG. 4 is a circuit block diagram of the additional buzzer unit 6, in which the alarm signal from the base unit 4 is sent to the PLC receiver 20.
Decoder 2 receives the signal and extracts only the signal component.
1, the pulse signal is converted into a pulse signal, and the buzzer 23 is sounded or the lamp 24 is turned on via the output control circuit 22. Note that 25 indicates a power supply section.

FIG. 5 is a signal waveform diagram showing the transmission procedure during polling to constantly monitor the presence or absence of an abnormality in the communication line between the base unit 4 and the slave unit 5. The master device 4 polls the handset 5 sequentially every second, and if there is no abnormality in the communication line such as a failure on the handset side or disconnection of the connector 3, normal data is sequentially sent from the handsets. At the time of starting the polling, the base unit 4 sends the house code Y1, address zero, and polling data Y2 to the line. When all the slave units 5 receive these signals, the slave units 5 set their own addresses and enter a standby state. Under this state, the base unit 4 sets the address Y3 unique to the first slave unit 5a.
(5-bit information in this embodiment) is set, and this address Y3 and polling data Y4 (4-bit information in this embodiment) are sent to the line.

Since this address Y3 and the address of the first handset 5a match, the first handset 5a accepts the polling data Y4 and uses its own address Y5.
and normal data Y6. A few seconds after sending these self-address Y5 and normal data Y6, all slave devices cancel their self-address settings and return to a normal state (a state in which intrusion abnormality signals can be transmitted).

30 seconds after this return, the house code Y1, address zero, and polling data Y2 are sent again from the base unit 4 to all the slave units, and all the slave units set their own addresses and enter the standby state. Under this condition, the base unit 4 sets the address Y7 of the second slave unit 5b, and sends out this address data Y7 and polling data Y8. This address data Y7
and the address of the second handset 5b match, so it accepts polling data Y8 and sends out its own address Y9 and normal data Y10. A few seconds after sending these self-address Y9 and normal data Y10, all slave devices cancel their self-address settings and return to the normal state. Thereafter, the communication lines with all slave devices are sequentially monitored in the same way.

Since this embodiment uses a power line as a signal transmission path, there is a possibility that various noises are superimposed on the power line, so it is necessary to improve the reliability of communication between the base unit and slave unit. Therefore, the house code above is 18
The address data is configured to be repeatedly transmitted four times.

In addition, if the handset cannot send normal data due to a malfunction or the cord is unplugged, the handset will be unable to make a call only if the main unit fails to receive normal data from the same handset twice in a row. (communication line abnormality) and sends such information to the monitoring center as necessary.

FIG. 6 is an intrusion abnormality signal waveform diagram when the built-in sensor in the handset 5 detects an intruder and sends an intrusion abnormality signal to the base unit 4, and shows that multiple handsets detect an intruder at the same time. If the intrusion error signals are sent all at once, a collision will occur between the signals and the base unit will not be able to identify the signals, so the slave unit will
A unique delay time t1 is set for each address, and an intrusion abnormality signal is sent out after this unique delay time t1. Taking the address of a certain handset as an example, the above inherent delay time is 81.92×(2 ² + 2 ¹ + 2 ⁰ ) =
Set it like 573.4ms.

The handset that detected an intruder will send the intrusion abnormality signal after the above-mentioned specific delay time with house code Y11.
, address zero Y12, and data zero Y13 are sent to the power line 2, and upon receiving this signal, all slave units set their own addresses and enter a standby state.Similarly, the base unit also receives this signal and suppresses polling. Under this condition, the handset that detected an intruder will subsequently write address zero and its own address as data Y14.
It is sent to power line 2 as a power line. At this time, the base unit 4 has a zero address, receives the address of the slave unit that has issued the alarm, sets the address, and receives the alarm data Y15 (intrusion abnormality signal) that the slave unit sends next.

Next, the base unit 4 sends the house code Y16, the address Y17 of the slave unit that issued the alarm, and the acknowledgment data Y18 to the power line 2. On the other hand, the slave unit that issued the alarm cancels its own address setting upon receiving the acknowledgment data Y18 from the base unit 4.

Main unit 4 buzzes for house code Y19 and additional buzzer unit 6 following acknowledgment data Y18.
ON data Y20 and lamp ON data Y21 are repeatedly sent out multiple times to complete a series of alarm operations between the slave unit, base unit, and additional buzzer unit. If the sensor of another slave unit detects an intruder while this series of alarm operations is being performed, the slave unit becomes latched and receives the house code from the base unit on the power line. Wait for example 5 seconds for each
If there is no house code after 5 seconds, the operation described with reference to FIG. 6 is performed.

Furthermore, if the handset that has issued the intrusion abnormality signal cannot receive the acknowledgment data from the base unit due to noise on the power line, etc., the handset is configured to repeatedly send out the intrusion abnormality signal. ing.

In this way, when a slave unit enters the intrusion abnormality alarm operation, it sends the house code onto the track as the first information, puts all other slave units in a standby state, and suppresses polling of the base unit. In addition, when the base unit starts polling, it similarly sends out a house code to put all slave units in standby mode, and prevents collisions when sending signals between slave units and between slave units and base unit. I'm avoiding it.

Effects of the Invention According to the present invention, when transmitting the intrusion abnormality signal, in order to avoid collision with intrusion abnormality signals sent from other slave units, the first condition is that each slave unit A unique delay time is set so that each handset starts transmitting an intrusion abnormality signal after the unique delay time has elapsed, and the second condition is that when the first handset that detects an intrusion abnormality transmits, all other handset The handset is placed in a standby state, and after the base unit completes receiving the first intrusion abnormality signal, the standby state is canceled and the other handsets start transmitting the intrusion abnormality signal. Polling from the base unit to the slave unit is suppressed while the intrusion error signal is being sent from the slave unit to the base unit, and by suppressing the sending of an intrusion error signal from the slave unit to the base unit during polling, the slave unit , it is possible to avoid signal collisions between base units, and it is possible to reliably prevent signal collisions between slave units or signal collisions between slave units and base units, which are the conventional drawbacks. Furthermore, when the handset detects an intrusion abnormality, it can immediately issue an alarm to the base unit, which eliminates the drawbacks of the conventional method, such as the lack of quick response to the alarm operation when an intrusion abnormality occurs, and the occurrence of signal interference. It is possible to solve the above drawbacks and provide a highly reliable abnormality monitoring method using two-way communication.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a circuit block diagram of an alarm monitoring system using two-wire bidirectional communication using electric power lines, Fig. 2 is a circuit block diagram of a main unit, and Fig. 3 is a Circuit block diagram of slave unit, 4th
The figure is a circuit block diagram of the additional buzzer unit, No. 5.
The figure is a signal waveform diagram showing the transmission procedure during polling to monitor the status of the slave unit from the base unit, and Figure 6 is the procedure in which the sensor of the slave unit detects an intruder and sends an intrusion abnormal signal to the base unit. FIG. 2...Light line, 3...Connector, 4...Base unit, 5
...Slave unit, 6...Additional buzzer unit, 7...Telephone line, 8...Telephone.

Claims (1)

[Claims] 1 Equipped with a plurality of slave units for intruder detection and a master unit that centrally monitors the slave units via electric power lines, and in the event of an abnormality in which the slave unit detects an intruder, the slave unit transmits an intrusion abnormality signal to the parent unit. Under normal conditions, the base unit polls each slave unit at regular intervals to determine whether the slave unit is capable of detecting an intruder, and monitors the communication line between the base unit and slave units. In this method, when transmitting the above-mentioned intrusion error signal, in order to avoid collision with the intrusion error signal sent from other slave units and the polling of the base unit, the first condition is to A unique delay time is set so that each handset starts transmitting an intrusion abnormality signal after the unique delay time has elapsed, and as a second condition, the transmission of the intrusion abnormality signal by the handset that first detected an intrusion abnormality causes all other The slave unit is placed in a standby state, and after the master unit completes receiving the first intrusion error signal, the standby state is released and the other slave units start transmitting the intrusion error signal. A power line using two-way communication, characterized in that polling from the master unit is suppressed while the slave unit is sending out an intrusion error signal, and while polling is being performed, the transmission of the intrusion error signal from the slave unit is suppressed. How to monitor usage abnormalities.