JP2010239284A - Event occurrence information transfer method and system thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce time and efforts for changing the layout of an information transfer network. <P>SOLUTION: An event occurrence information transfer method is disclosed for transferring event occurrence information to a master station, while relaying a plurality of slave stations. When it is defined as broadcasting to transmit information, while placing it on a radio wave without specifying a partner, relaying of the event occurrence information between slave stations is performed by the broadcast. The broadcast is for unidirectionally transmitting information, and there is no need for specifying a partner. Flexibility in arrangement is therefore high, and the layout of an information transfer network can be changed relatively freely. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an event occurrence information transmission method and an event occurrence information transmission system.

  One means for transmitting information is communication. Communication is to send and receive information after establishing a connection with the transmission partner. If you can not connect to the other party, try to connect after a certain time, or try to connect with another party It has become. Patent Document 1 listed below proposes an invention relating to a multi-hop wireless network in which communication is performed between arbitrary wireless devices while relaying halfway as an applied communication technique.

JP 2006-148417 A

In the information transmission method using communication, information is transmitted on the condition that a connection with the other party is established, so that information can be reliably transmitted to the other party and reliability is high. Therefore, there is an advantage that event occurrence information can be reliably transmitted even in a case where event occurrence information is transmitted by forming an information transmission network. However, in the communication format, the transmission control procedure (procedure between devices when transmitting / receiving information) is complicated. Therefore, when changing the layout of the information transmission network once constructed, it is necessary to review the settings of the communication partner for all points of the communication equipment that constitutes the information transmission network, and there is a problem that it takes time to change the layout afterwards. .
The present invention has been completed based on the above situation, and an object of the present invention is to reduce the trouble of changing the layout of an information transmission network.

  The present invention is a method for transmitting event occurrence information in which event occurrence information is transmitted to a parent station while relaying a plurality of slave stations. Broadcasting is defined as transmitting information on radio waves without specifying a partner. Then, the event occurrence information is relayed between the slave stations by the broadcast.

  In the present invention, event occurrence information is relayed by broadcasting. Since broadcasting transmits information in one direction, the layout of the information transmission network can be freely changed.

The following configuration is preferable as an embodiment of the present invention.
・ Suspend broadcasting to each slave station that has broadcast for a certain period of time after the broadcast is complete. By doing in this way, it is possible to prevent the broadcast from being repeated indefinitely in the information transmission network.

The pause time Ta during which broadcasting is suspended is a time obtained by multiplying the broadcast time To required for each slave station by one broadcast by the number N of slave stations constituting the information transmission network. By doing in this way, it is possible to more reliably avoid the broadcast being repeated indefinitely in the information transmission network, and the pause time Ta does not become longer than necessary.

  The present invention is an event occurrence information transmission system for transmitting event occurrence information to a parent station while relaying a plurality of slave stations, wherein the parent station side is defined as upstream, and is placed on a radio wave without specifying a partner. When broadcasting information is defined as broadcasting, a slave station equipped with a detection function for detecting the occurrence of an event and a wireless call function is included in the range where one or more slave stations on the upstream side can receive their own radio waves. The information transmission network is constructed in such a manner that each of the slave stations has an event information transmission function for broadcasting the event occurrence information on a radio wave on condition that the occurrence of the event is detected; An event information relay function for relaying event information between slave stations that construct an information transmission network by broadcasting the received event information on radio waves on condition that the event occurrence information broadcast by the slave stations is received; From A control circuit for.

  In the present invention, event occurrence information is relayed by broadcasting. Since broadcasting transmits information in one direction, the layout of the information transmission network can be freely changed.

The following configuration is preferable as an embodiment of the present invention.
・ Suspend broadcasting to each slave station that has broadcast for a certain period of time after the broadcast is complete. By doing in this way, it is possible to prevent the broadcast from being repeated indefinitely in the information transmission network.

The pause time Ta during which broadcasting is suspended is a time obtained by multiplying the broadcast time To required for each slave station by one broadcast by the number N of slave stations constituting the information transmission network. By doing in this way, it can avoid more reliably that a broadcast is repeated infinitely within an information transmission network. Also, the pause time Ta does not become longer than necessary.

• Store a unique station number in each slave station. Then, on condition that the occurrence of the event is detected, each slave station broadcasts its own station number on the radio wave as the occurrence information of the event.

  According to the present invention, the layout of the information transmission network can be freely changed.

Configuration diagram of a reporting system according to Embodiment 1 of the present invention Illustration of location conditions for slave stations The figure which shows that the information transmission network is constructed with the slave station Figure showing an example of slave station installation Circuit diagram of phase loss detection circuit and power failure detection circuit Diagram showing contact switch connection Block diagram showing the electrical configuration of the slave station Block diagram showing electrical configuration of DTMF signal reading circuit and DTMF signal generating circuit (1) Diagram showing the audio frequencies that make up the DTMF signal (2) Chart that associates 16 numbers with audio frequencies Block diagram showing the electrical configuration of the master station A diagram explaining the downtime Ta The figure which shows the operation in which abnormality occurrence information is relayed to each slave station and transmitted to the master station Configuration diagram of the reporting system (shows the location change of slave station F5) Configuration diagram of the reporting system (shows expansion of slave station F) The figure which shows allocation of the number with respect to each child station in Embodiment 2. The figure which shows the other example of the notification system which concerns on this invention

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS.
1. Configuration of the entire system The notification system U is intended to notify the monitoring staff of event occurrence information such as power distribution system abnormalities and slave station power supply abnormalities. And a plurality of slave stations F (in this embodiment, seven stations F1 to F7). Each of the master station G and the slave station F has a wireless communication function, and each of the slave stations F1 to F7 is arranged at a place satisfying the following arrangement condition in the monitoring area.

The arrangement conditions are the following two.
(1) One or more slave stations F are within a range where radio waves reach the master station G.
(2) When the master station G is upstream, the other slave stations F are within a range where radio waves reach one or more slave stations F arranged on the upstream side.
In FIG. 2, a circle indicated by a one-dot chain line indicates a range in which the radio wave of each slave station F reaches.

  By satisfying such an arrangement condition, as shown in FIG. 3, an information transmission network Z having the relay stations as relay points can be constructed by each of the slave stations F1 to F7 arranged in a scattered manner. In this embodiment, a station number “0” is assigned to the master station G, and station numbers “1” to “7” are assigned to the slave stations F. When the event occurrence information is detected, the slave station F notifies the master station G of the event occurrence information and the occurrence location by transmitting its own station number to the master station G while relaying each slave station F. It has a configuration.

2. Configuration of Slave Station Each slave station F is composed of a slave station body 20 and a small radio (hereinafter simply referred to as a radio) 70, and is attached to, for example, a utility pole D for supporting an overhead distribution line ( (See FIG. 4). In this embodiment, a three-phase four-wire distribution system that distributes three-phase 200V and single-phase 100V is monitored, and the slave station body 20 is missing corresponding to the three-phase 200V distribution lines Lb, Lw, and Lr. A phase detection circuit (event information detection means) 22 is provided, and a power failure detection circuit (event information detection means) 25 is provided corresponding to a single-phase 100V lead wire (see FIG. 5).

  The phase loss detection circuit 22 includes three electromagnetic coils 23B, 23W, and 23R that are star-connected, and is configured such that phase voltages of three phases are applied to the electromagnetic coils 23B, 23W, and 23R. These electromagnetic coils 23B, 23W, and 23R constitute an electromagnetic relay together with the contact switches 24B, 24W, and 24R.

  Each contact switch 24B, 24W, 24R closes the make contact a when the electromagnetic coils 23B, 23W, 23R are energized, and closes the break contact b when not energized. These contact switches 24B, 24W, 24R are connected in parallel as shown in FIG. 6, each common terminal C is connected to the neutral line Lc, and each break contact b is commonly connected to the output line L1. Yes.

  From the above, when each of the three phases is healthy, the break contact b of each contact switch 24B, 24W, 24R is opened and the output line L1 is opened as shown in (1) of FIG. Become. On the other hand, when there is an open phase, as shown in (2) of FIG. 6, the break contact b of the contact switch (24 W in this case) corresponding to that phase is closed. Therefore, the output line L1 is connected to the neutral line Lc and the potential becomes zero. From the above, it is possible to detect the presence / absence of a phase failure in the three-phase 200V distribution line depending on whether the output line L1 is open or connected (potential zero).

  The power failure detection circuit 25 includes an electromagnetic coil 26 as in the case of the phase loss detection circuit 22. The electromagnetic coil 26 is provided between the neutral wire Lc and a single-phase 100V lead wire (distribution line Lb in the figure), and is configured to be applied with the single-phase 100V. The electromagnetic coil 26 and the contact switch 27 constitute an electromagnetic relay. The contact switch 27 connects the common terminal C to the neutral line Lc, and connects the break contact b to the output line L2. The contact switch 27 closes the make contact a when the electromagnetic coil 26 is energized, and closes the break contact b when not energized.

  From the above, if the single phase 100V is normally supplied, the break contact b of the contact switch 26 is opened, and the output line L2 is opened. On the other hand, when the single-phase 100V is out of power, the break contact b of the contact switch 26 is closed. As a result, the output line L2 is connected to the neutral line Lc and the potential becomes zero. From the above, it is possible to detect the presence or absence of a single-phase 100V power failure depending on whether the output line L2 is open or connected (potential zero).

  As shown in FIG. 7, the phase loss detection circuit 22 and the power failure detection circuit 25 are connected to a storage circuit 29 provided in the slave station body 20, and the phase loss and power failure are detected by these detection circuits 22 and 25. The information is stored in the storage circuit 29.

  Further, a power supply monitoring circuit (event information detecting means) 28 is connected to the storage circuit 29. The power supply monitoring circuit 28 detects the output voltage and output current of the power supply (battery) 53 and monitors the presence or absence of a power supply abnormality. When a power supply abnormality is detected, the information is stored in the storage circuit 29. ing.

  Then, the control circuit 21 provided in the slave station main body 20 periodically accesses the storage circuit 29 to check the stored information, thereby confirming the presence / absence of a missing phase of the three-phase 200V distribution line L, the single-phase 100V. It is configured to monitor whether there is a power outage or whether there is a power failure.

  As shown in FIG. 7, the slave station body 20 includes a DTMF signal generation circuit 31, a DTMF signal reading circuit 41, an interference prevention detection circuit 51, a timer 55, and a ROM 57.

  As shown in FIG. 8, the DTMF signal generation circuit 31 includes a DTMF signal generation IC 32, a crystal oscillator 35, and the like. The DTMF signal generating IC 32 is provided with four input ports P1 to P4. When 4-bit data is input from the output ports (P21 to P24) of the control circuit 21, the DTMF signal is generated according to the input 4-bit data. Is generated.

  A DTMF (Dual-Tone Multi-Frequency) signal is a signal sound in a voice frequency band known as a so-called tone signal. As shown in FIG. This signal is a combination of any of the sounds in the high group consisting of f8.

  The output port P5 of the DTMF signal generating IC 32 is connected to the microphone terminal 84A of the radio device 80, and the generated DTMF signal (signal sound) can be transmitted through the radio device 80.

  From the above, when 4-bit data (data of station numbers “0” to “15”) is output from the control circuit 21 to the IC 32 for generating a DTMF signal, the output data of the station number is converted into a DTMF signal. After the conversion, the information is broadcasted to the peripheral slave stations F constituting the information transmission network Z through the wireless device 80. In this embodiment, since the slave station F has only seven stations F1 to F7, the station numbers “8” to “15” are vacant.

  As shown in FIG. 8, the DTMF signal reading circuit 41 includes a DTMF signal reading IC 42, a crystal oscillator 45, and the like. The DTMF signal reading IC 42 includes one input port P6 and five output ports P7 to P11. The input port P6 is connected to the speaker terminal 82A of the wireless device 80. The DTMF signal reading IC 42 reads the DTMF signal from the output signal output from the wireless device 80 through the speaker and then decodes it.

  The four output ports P7 to P10 of the DTMF signal reading IC 42 are connected to the input ports (P27 to P30) of the control circuit 21, and the DTMF signal reading IC 42 decodes the DTMF signal to the control circuit 21. The configuration is such that 4-bit binary data (data corresponding to station numbers “0” to “15”) is output to the control circuit 21.

  The output port P11 is connected to the check port P31 of the control circuit 21. The first DTMF signal reading IC 42 outputs an H level confirmation signal from the output port P11 on condition that a valid signal sound (DTMF signal) is detected. Thereby, the control circuit 21 can determine that a valid signal sound is received on condition that the check port P31 becomes H level.

  In addition, the interference prevention detection circuit 51 performs so-called interference prevention together with the control circuit 21, detects presence / absence of speaker output of the wireless device 80, and outputs a detection signal to the control circuit 21 during a period of speaker output. When receiving the detection signal, the control circuit 21 prohibits the output to the DTMF signal generation circuit 31 while there is a speaker output. Thereby, the transmission operation during speaker output (receiving) is prevented.

  The wireless device 80 includes a reception circuit 81, a speaker 82, a transmission circuit 83, a microphone 84, a switching circuit 85, an antenna 87, a speaker terminal 82A, a microphone terminal 84A, and a PTT terminal 88A. The connection of each circuit is as shown in FIG. 7, and both the reception circuit 81 and the transmission circuit 83 are connected to the antenna 87 via the switching circuit 85, and the reception circuit 81 has a speaker 82 and a speaker terminal 82A. The microphone 84 and the microphone terminal 84A are connected to the transmission circuit 83.

  The receiving circuit 81 demodulates the received signal received by the antenna 87 and then outputs it through the speaker terminal 82A or the speaker 82. The transmission circuit 83 modulates a DTMF signal captured through the microphone terminal 84A or the microphone 84 and outputs the modulated DTMF signal to the antenna 87.

  The switching circuit 85 operates according to the connection state of the PTT terminal 88A. When the PTT terminal 88A is open, the antenna 87 is connected to the receiving circuit 81, and the PTT terminal 88A is at the L level (low level). In this case, the antenna 87 is connected to the transmission circuit 83.

  In this embodiment, the PTT terminal 88A is connected to the ground via the switch SW1, and the switch SW1 can be ON / OFF controlled by the control signal Sr output from the control circuit 21. Therefore, when the control circuit 21 turns on the switch SW1, the PTT terminal 88A becomes L level, and the receiving circuit 81 is connected to the antenna 87. On the other hand, when the control circuit 21 turns off the switch SW1, the PTT terminal 88A is opened, and the transmission circuit 83 is connected to the antenna 87. Normally, the switch SW1 is controlled to be in the OFF state by the control circuit 21, and the wireless device 80 is in a state of performing a receiving operation for receiving radio waves.

3. Configuration of Master Station G As shown in FIG. 10, the master station G includes a radio unit 180 and a master station main body 120. The radio unit 180 of the master station G includes a receiving circuit 181, a transmitting circuit 183, a switching circuit 185, an antenna 187, a speaker terminal 182A, a microphone terminal 184A, and a PTT terminal 188A. The radio unit 180 performs the same function as the radio unit 80 of the slave station, modulates the input DTMF signal, transmits the signal through the antenna 187, demodulates the received signal received through the antenna 187, and outputs the speaker. To do.

  The switching circuit 185 operates in accordance with the connection state of the PTT terminal 188A, similarly to that of the slave station. When the PTT terminal 188A is open, the antenna 187 is connected to the reception circuit 181 and the PTT terminal 188A is L In the case of the level (low level), the antenna 187 is connected to the transmission circuit 183.

  In this embodiment, the PTT terminal 188A is connected to the ground via the switch SW1, and the switch SW1 can be ON / OFF controlled by the control signal Sr output from the control circuit 121. Therefore, when the control circuit 121 of the master station main body 120 turns on the switch SW1, the PTT terminal 188A becomes L level, and the receiving circuit 181 is connected to the antenna 187. On the other hand, when the control circuit 121 turns off the switch SW1, the PTT terminal 188A is opened, and the transmission circuit 183 is connected to the antenna 187. Normally, the switch SW1 is controlled to be in an OFF state by the control circuit 121, and the wireless unit 180 is in a state of performing a receiving operation for receiving radio waves.

  The master station main body 120 includes a DTMF signal generation circuit 131, a DTMF signal reading circuit 141, an interference prevention detection circuit 151, a power supply circuit 153, and a ROM 157. The functions of these circuits are the same as those of the DTMF signal generation circuit 31, the DTMF signal reading circuit 41, the interference prevention detection circuit 51, and the power supply circuit 53 of the slave station body 20.

  For example, in the case of the DTMF signal generation circuit 131, a DTMF signal is generated according to 4-bit binary data (data corresponding to station numbers “0” to “15”) input from the control circuit 121, and this is generated as a radio unit 180. To input. In the case of the DTMF signal reading circuit 141, after reading the DTMF signal from the output signal output from the microphone by the radio unit 180, it is converted into 4-bit binary data (data corresponding to the station numbers "0" to "15"). And output to the control circuit 121.

  Since the master station G receives a report from the slave station F, the detection circuit such as the phase loss detection circuit 22 and the power failure detection circuit 25, and the storage circuit 29 are not provided for storing the detection results. First, notification notification means such as a display 125 and a buzzer 127 are provided.

  The master station main body 120 is provided with a reset switch SW2. The reset switch SW2 is connected to the control circuit 121. The control circuit 121 transmits the information of the station number “0” through the wireless unit 180 on the condition that the reset switch SW2 is turned on. In this communication system U, when the station number “zero” is received, each slave station F determines the broadcast protocol so as to reset the information in the storage circuit 29, and the monitor turns ON the reset switch SW2, The reporting system U can be reset (the storage circuit 29 of each slave station F constituting the information transmission network Z can be cleared).

4). Broadcast Protocol Broadcast protocol (1) to (4) is defined for slave station F.
(1) If abnormality information is stored in the storage circuit 29, the station number is broadcast using the radio 80.
(2) When a broadcast is received, if it is other than its own station number, the station number is broadcast.
(3) The broadcast is suspended for a certain time after the completion of the broadcast (the broadcast is not broadcast even if a station number other than itself is received during that time).
(4) When the station number “0” is received, the storage circuit 29 is reset.

  Here, “broadcast” means to send information in one direction without specifying the partner, and “communication” to send information after specifying the partner and establishing a connection. Is a different concept.

  In the communication system U, a broadcast program for executing the broadcast protocol is stored in the ROM 57 of each slave station body 20, and each control circuit 21 issues a command to each circuit according to the broadcast program written in the ROM 57. As a result, each slave station operates according to the broadcasting protocols (1) to (4).

  Note that the timer 55 provided in the slave station main body 20 measures the pause time Ta during which the broadcast of (3) is paused. In the present embodiment, the pause time Ta is set to a time obtained by multiplying the broadcast time To required for each slave station by the number N of slave stations constituting the information transmission network Z (seven in this example). (See FIG. 11).

5). Explanation of Operation and Effect Normally, the radio communication functions of the slave stations F1 to F7 and the master station G are all controlled to perform a reception operation. Then, the control circuit 21 of the slave station main body 20 of each of the slave stations F1 to F7 periodically performs processing for accessing the storage circuit 29 and confirming whether or not abnormality occurrence information has been written. This monitoring state continues if there is no power distribution system or power failure.

  Hereinafter, the operation of the notification system U will be described by taking as an example a case where a power failure has occurred in the power distribution system monitored by the slave station F5. As shown in FIGS. 3 and 12, when a power failure occurs at time t0, the power failure detection circuit 25 detects the power failure and stores the information in the storage circuit 29 of the slave station body 20. Then, the power failure information is confirmed by the control circuit 21 of the slave station F5.

  When the occurrence of an abnormality is confirmed, the control circuit 21 of the slave station F5 broadcasts its own station number “5” using the radio 80 according to the broadcast protocol (1). More specifically, the control circuit 21 first outputs a switch switching signal Sr and turns on the switch SW1. As a result, the connection state of the PPT terminal 88A of the radio device 80 is switched from open to L level (low level), and the connection destination of the antenna 87 is switched from the reception circuit 81 to the transmission circuit 83.

  Then, the control circuit 21 of the slave station F5 outputs 4-bit binary data corresponding to its own station number “5” to the DTMF signal generation circuit 31. As a result, the DTMF signal generation circuit 31 generates a DTMF signal corresponding to the station number “5”, and the generated DTMF signal is input to the radio 80. Thereafter, the input DTMF signal is modulated by the transmission circuit 83 and then sent to the antenna 85 for broadcasting. The control circuit 21 of the slave station F implements the “event information transmission function” of the present invention by the function of broadcasting its own station number through the radio 80 in accordance with the broadcast protocol (1).

  After the broadcast is completed, the slave station F5 pauses the broadcast for the pause time Ta according to the broadcast protocol (3). Then, the connection destination of the antenna 87 is switched from the transmission circuit 83 to the reception circuit 81 during the pause time Ta. As a result, the slave station F5 returns to the receivable state.

  On the other hand, when broadcasting is performed at the slave station F5, the radio wave transmitted by the slave station F5 is received by the slave station F4 installed within the radio wave reachable range of the slave station F5 (see FIGS. 3 and 12). . In the slave station F4 that has received the radio wave, the reception signal received by the reception circuit 81 of the wireless device 80 is demodulated, and the signal is output to the DTMF signal reading circuit 41.

  Then, the DTMF signal reading circuit 41 extracts a DTMF signal from the output signal that has been output, decodes it into 4-bit data (here, data of the station number “5”), and outputs it to the control circuit 21.

  As a result, the data of the station number “5” is taken into the control circuit 21. Then, the control circuit 21 of the slave station F4 broadcasts the received station number “5” in the same procedure as that of the slave station F5 according to the broadcast protocol (2). Note that the “event information relay function” of the present invention is realized by the function of the control circuit 21 of the slave station F broadcasting the received station number through the radio 80 in accordance with the broadcast protocol (2).

  Then, after the broadcast is completed, the slave station F4 pauses the broadcast for the pause time Ta according to the broadcast protocol (3). Then, the connection destination of the antenna 87 is switched from the transmission circuit 83 to the reception circuit 81 during the pause time Ta. As a result, the slave station F4 returns to a receivable state.

  On the other hand, when broadcasting is performed at the slave station F4, the radio wave transmitted by the slave station F4 is received by the slave station F3 installed within the radio wave reachable range of the slave station F4 (see FIGS. 3 and 12). . Thus, the data of the station number “5” is taken into the control circuit 21 of the slave station F3 through the DTMF signal reading circuit 41. Thereafter, the slave station F3 broadcasts the station number “5” according to the broadcast protocol (2) in the same manner as the slave station F4. Then, after the broadcast is completed, the slave station F3 pauses the broadcast for the pause time Ta according to the broadcast protocol (3). Then, the connection destination of the antenna 87 is switched from the transmission circuit 83 to the reception circuit 81 during the pause time Ta. As a result, the slave station F3 returns to the receivable state.

  In this way, each slave station F that has received the broadcast repeats the broadcast of the same content (here, the station number “5” of the slave station F5 in which the power failure has occurred), so that the broadcast content relays each slave station F. Then, it is transmitted to the master station G in order. In this embodiment, since the slave station F1 is disposed within the radio wave reachable range of the slave station F3, as shown in FIGS. 3 and 12, the slave station F1 has a power failure after the slave station F3. Broadcasts the station number “5” of the child station F5 in which occurrence of the error occurs.

  When broadcasting is performed at the slave station F1, the radio wave transmitted from the slave station F1 is received at the master station G. In the master station G that has received the radio wave, similarly to the slave station F, the received signal received by the receiving circuit 181 of the wireless unit 180 is demodulated, and the signal is output to the DTMF signal reading circuit 141.

  Then, the DTMF signal reading circuit 141 extracts the DTMF signal from the output signal that has been output, decodes it into 4-bit data (here, data of the station number “5”), and outputs it to the control circuit 121.

  As a result, the data of the station number “5” is taken into the control circuit 121 of the master station G. Then, the control circuit 121 notifies the buzzer 127 and causes the display 125 to display the station number “5”. Thus, the supervisor is notified that a power failure has occurred in the distribution system monitored by the slave station F5.

  As described above, in the notification system U, the abnormality occurrence information of the power distribution system generated in the remote place can be reported to the monitoring staff at the monitoring station together with the information on the occurrence location.

  The distribution system may be forced to change the system configuration in response to an increase or decrease in consumers. In such a case, the information transmission network Z needs to be reorganized.

  In this regard, in the notification system U, information is transmitted by broadcasting. Broadcasting only emits radio waves in one direction, so as long as radio waves arrive, the slave station F can be placed freely anywhere and there is no need to specify the other party unlike communications. .

  Therefore, for example, as shown in FIG. 13, when the arrangement of the slave station F5 is changed from the diagonally lower left position in the figure to the center position on the upper side in the figure, Although the station F4 is changed to the slave station F3, the setting changes associated therewith are of course not required for the slave stations F3 and F4, and the slave station F5 need not be changed at all. In addition, when adding the slave stations F (see FIG. 14), it is not necessary to change the settings of the existing slave stations F1 to F7. Therefore, it is easy to reorganize the constructed information transmission network Z.

  In the notification system U, the pause time Ta is determined by the broadcast protocol (3), and the broadcast is stopped for a certain time after the broadcast is completed. Moreover, the pause time Ta is set to a time obtained by multiplying the broadcast time To required for each slave station by the number N of slave stations constituting the information transmission network Z (seven in this example). .

  By doing so, each slave station broadcasts information only once, so that the same information does not continue to be broadcast indefinitely between each slave station F constituting the information transmission network Z.

  In the above description of the operation, an example has been described in which each station broadcasts in the order of the slave station F5 → the slave station F4 → the slave station F3 → the slave station F1, so that the information of the station number 5 is transmitted to the master station G. Needless to say, in the process of relaying data, the slave station F that performs broadcasting in addition to the slave stations F5, F4, F3, and F1. This is because, for example, the broadcast of the slave station F3 receives the slave station F6 in addition to the slave station F1. Therefore, when the slave station F1 broadcasts following the slave station F3, the slave station F6 also broadcasts in the same manner. However, in this case, the broadcast of the slave station F6 is so-called downstream (direction away from the master station G) and is not directed to the master station G side. Further, depending on the arrangement of the slave stations, the radio waves broadcast by the plurality of slave stations F may be received simultaneously by the other slave stations F. In such a case, priority is given to the stronger radio waves. .

  Next, the reset operation will be described. When the reset switch SW2 of the master station G is operated, information of the station number “0” is broadcast by the master station G. When the master station G broadcasts, the information is also sequentially broadcast by each slave station F and received by each slave station F constituting the information transmission network Z. Each slave station F that has received the station number “0” resets the storage circuit 29 in accordance with (4) of the broadcast protocol.

  Thus, the monitoring staff at the monitoring station can reset the storage state of the storage circuit 29 of each slave station F constituting the information transmission network Z by operating the reset switch SW2 of the master station G. And by enabling such a reset operation, the following effects can be obtained.

  As described above, in the notification system U, each slave station F broadcasts information only once. For this reason, when a radio malfunction or interference occurs, the transmission of information by broadcasting is interrupted in the middle, and the master station G may not be notified of an abnormality in the distribution system.

  In this respect, if the storage state of the storage circuit 29 of each slave station F is reset by performing the above reset operation, the slave station F in which an abnormality in the distribution system or a power supply abnormality has occurred, The power supply abnormality is detected again, and the abnormality occurrence information is written in the storage circuit 29. Then, the slave station F broadcasts its own station number again, and broadcast transmission is performed again by each slave station F constituting the information transmission network Z. Therefore, it is possible to notify the master station G of abnormality occurrence information that was interrupted and could not be transmitted.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG.
In the first embodiment, numbers “1” to “7” are assigned to the slave stations F1 to F7. On the other hand, in the second embodiment, as shown in FIG. 15, three numbers “3n”, “3n + 1”, and “3n + 2” are assigned to each slave station F. “N” is the station number of each slave station.

In this embodiment, the broadcasting protocol of each slave station F is defined as follows.
(1) If information on the occurrence of an abnormality is stored in the storage circuit 29, the number “3n” assigned to itself is broadcast using the radio 80.
(2) The number “3n + 1” is a confirmation signal. The slave station that has received the number “3n + 1” assigned to itself broadcasts the information “3n” if the abnormality occurrence information is written in the storage circuit 29, and the abnormality occurrence information is written in the storage circuit 29. If not, the information “3n + 2” is broadcast.

  By determining the broadcast protocol in this way, the status of each slave station F can be individually confirmed by an instruction from the master station G. For example, in the notification system U shown in FIG. 1, if it is desired to check the status of the slave station F3, the master station G can broadcast the confirmation number “10” of the slave station F3 on radio waves. That's fine. Then, the broadcast is received by the slave station F3 through the slave station F1.

  Then, when receiving the broadcast, the slave station F3 broadcasts information “9” or “11” according to the storage state of the storage circuit 29. The broadcast is received by the master station G via the slave station F1. If the received information is “9”, the master station G can confirm that there is an abnormality in the power distribution system or power source monitored by the slave station F3. If the received information is “11”, it can be confirmed that there is no abnormality in the distribution system monitored by the slave station F3 and that the power supply is operating normally.

  In addition, when the master station G broadcasts the number “10”, which is the confirmation number of the slave station F3, on the radio wave, when no information is returned, the slave station F3 broadcasts. Can not be received or broadcast.

  As described above, if three numbers “3n”, “3n + 1”, and “3n + 2” are assigned to the slave station F, the number of numbers exceeds 16 types. This can be dealt with without problems if the number of digits of the DTMF signal is increased and the numbers of the first and second digits are broadcast in a time-sharing manner.

  As with the broadcast protocol of the first embodiment, this embodiment also broadcasts the station number if it is a number other than the number assigned to it when the broadcast is received. There is no change in the point of suspending.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the first and second embodiments, the application system of the notification system U is exemplified as a power distribution system and power supply abnormality detection, but the detection target event is not limited to the exemplified event. For example, a notification system that detects the opening / closing of a door and reports it, or a reporting system that detects the presence or absence of a fire and reports it.

  (2) In the first embodiment, as an example of the configuration of the information transmission network Z, an example in which a plurality of slave stations F are scattered in a tree form is shown. However, as long as the arrangement conditions shown in the first embodiment are satisfied. For example, as shown in FIG. 16, a plurality of slave stations F may be arranged linearly.

  (3) In the first embodiment, the example in which the timer 55 is used to count the pause time Ta has been described. However, this may be performed by software (program).

20 ... Slave station body 21 ... Control circuit 22 ... Phase loss detection circuit (event information detection means)
25. Power failure detection circuit (event information detection means)
28 ... Power failure detection circuit (event information detection means)
DESCRIPTION OF SYMBOLS 29 ... Memory circuit 31 ... DTMF signal generation circuit 41 ... DTMF signal reading circuit 55 ... Timer 80 ... Radio | wireless machine 120 ... Master station main body 121 ... Control circuit 131 ... DTMF signal generation circuit 141 ... DTMF signal reading circuit 180 ... Radio | wireless part F1- F7 ... Slave station G ... Master station SW1 ... Switch SW2 ... Reset switch U ... Notification system (corresponding to "event occurrence information transmission system" of the present invention)

Claims (7)

A method for transmitting event occurrence information in which event occurrence information is transmitted to a parent station while relaying a plurality of slave stations.
When broadcasting is defined as sending information on radio waves without specifying the other party,
A method of transmitting event occurrence information, wherein relaying of the event occurrence information between slave stations is performed by the broadcast.   2. The event occurrence information transmission method according to claim 1, wherein each of the slave stations that has performed the broadcast pauses the broadcast for a certain period of time after the completion of the broadcast.   3. The pause time Ta during which the broadcasting is suspended is a time obtained by multiplying a broadcasting time To required for each slave station by one broadcast by the number N of slave stations constituting the information transmission network. Method for transmitting event occurrence information described in 1. An event occurrence information transmission system for transmitting event occurrence information to a parent station while relaying a plurality of slave stations,
When the master station side is defined as upstream, and broadcasting is defined as transmitting information on radio waves without specifying the other party,
A slave station equipped with a detection function for detecting the occurrence of an event and a wireless communication function is arranged so that one or more slave stations on the upstream side are included in a range where the own radio wave reaches, and an information transmission network is constructed.
Each slave station is
An event information transmission function that broadcasts the event occurrence information on radio waves on condition that the occurrence of the event is detected,
Event information relay that relays event information between slave stations that build an information transmission network by broadcasting the received event information on radio waves, on condition that the event occurrence information broadcast by other slave stations is received And an event occurrence information transmission system comprising a control circuit that exhibits functions.   5. The event occurrence information transmission system according to claim 4, wherein each of the slave stations that have performed the broadcast pauses the broadcast for a predetermined time after the completion of the broadcast.   6. The pause time Ta during which the broadcasting is suspended is a time obtained by multiplying a broadcasting time To required for each slave station by one broadcast by the number N of slave stations constituting the information transmission network. Event occurrence information transmission system described in 1. Each slave station stores a unique station number,
7. Each of the slave stations broadcasts the local station number on the radio wave as the occurrence information of the event on condition that the occurrence of the event is detected. The event occurrence information transmission system described.

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