TW201427435A - Communication system and terminal device - Google Patents

Abstract

Provided is a communication system in which a first terminal receives operation input that is from a user and that relates to a display panel and a primary request is transmitted from a primary request unit to a transmission unit. The transmission unit that has received the primary request transmits a secondary request to a second terminal using a superimposed signal, said second request being for requesting the measurement result of a measurement using a secondary request unit in accordance with the primary request. The second terminal that has received the secondary request from the transmission unit transmits the measurement result of the measurement unit from a primary response unit as a primary response to the transmission unit using a superimposed signal. On this occasion, the first terminal directly receives the primary response using a superimposed communication unit, said primary response being sent from the second terminal over a communication line without passing through the transmission unit.

Description

Communication system and terminal device

The present invention generally relates to a communication system and a terminal device. More specifically, the present invention relates to a communication system including a host connected to a communication line, a plurality of terminal devices connected to the communication line and communicating with the host, and a terminal device used in the communication system.

Conventionally, a communication system has been widely spread in which a transmission unit (host) and a plurality of communication terminals (slave) are connected to a transmission path, and communication is performed between each communication terminal and a transmission unit. As an example of such a communication system, there is a system in which the transmission unit periodically monitors the state of the communication terminal, and when the state of the communication terminal changes, the communication unit transmits the communication to the other communication in a manner to cope with the change of the state. The terminal sends a signal. Such a communication system is described, for example, in Japanese Patent No. 1180690 (hereinafter referred to as "Document 1"), Japanese Patent No. 1195362 (hereinafter referred to as "Document 2"), and Japanese Patent No. 1144477 (hereinafter referred to as "Document 3").

However, the communication system having the above configuration is originally used in a system such as an on/off control of a lighting fixture or the like, and the communication speed is slow, and is not suitable for transmission of information having a relatively large amount of data such as an analogous amount.

Therefore, there has been proposed a communication system including a communication terminal that communicates using a transmission signal transmitted from a transmission unit, and an overlapping terminal that communicates at a higher speed using an overlapping signal (for example, Japanese Patent Application Laid-Open No. 2009-225328 (hereinafter referred to as "literature 4")). The overlapping signal is superimposed on the signal of the transmitted signal.

The system-based communication terminal described in Document 4 (the "first communication terminal" of Document 4) shares the communication line (transmission path) with the overlapping terminal ("second communication terminal" of Document 4), so that it can be used in the established communication. It is easy to implement by adding overlapping terminals to the system. In Document 4, communication terminals communicate with each other via a transmission unit (host), and the overlapping terminals communicate directly with each other by a peer-to-peer (P2P, Peer to Peer) without a transmission unit.

Further, in the communication system described in Document 4, since the overlapping terminals directly communicate with each other, when the number of overlapping terminals increases, if the overlapping terminals are free to communicate, the communication timing or the order of communication cannot be controlled. Therefore, the overlapping terminal has a case where the waiting time for avoiding overlapping of overlapping signals becomes long, or communication is impossible.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a communication system capable of controlling a communication sequence or a communication sequence even when the number of terminal devices is increased, and a terminal device used in the communication system.

A communication system according to the present invention includes a host connected to a communication line, and a first terminal and a second terminal connected to the host connected to the communication line, and the first terminal includes transmitting a request to the host. a requesting unit, wherein the host includes a secondary requesting unit, and the secondary requesting unit transmits a secondary request to the second terminal when receiving the primary request, wherein the second terminal includes a primary response unit, and the primary response unit receives the second response unit In the case of the secondary request, the response is directly transmitted to the first terminal without passing through the host.

In the present invention, the first terminal has a requesting unit that transmits a request to the host once, and the host has a secondary requesting unit that transmits a secondary request to the second terminal when receiving the request once, and the second terminal does not pass the second request if it receives the request. The host directly transmits a response first response unit to the first terminal. Therefore, there is an advantage that the order of communication or the order of communication can be controlled even if the number of terminal devices is increased.

Preferably, in the communication system, when the secondary requesting unit receives the one-time request, the secondary requesting unit determines whether or not the first terminal and the second terminal communicate with the source of the primary request The specific condition is met, and based on the judgment result, it is decided whether to send the above secondary request.

In the communication system, it is preferable that the specific condition includes at least one of the case where the first terminal of the transmission source of the one-time request is registered as a member to the host; and when receiving the one-time request, the The host is not in communication with a terminal other than the above-described first terminal that is the source of the above-mentioned one request.

In the communication system, it is preferable that the first terminal and the second terminal communicate with each other in synchronization with a synchronization signal sent from the host to the communication line.

In the communication system, it is preferable that the host is a transmission unit that repeatedly transmits a transmission signal as the synchronization signal to the communication line, and the first terminal and the second terminal use a superimposed signal superimposed on the transmission signal. Overlapping terminals for communication.

In the communication system, it is preferable that the transmission signal is divided into a plurality of sections in the time axis direction for each frame, and the host system allocates a section of the plurality of sections as a first period in which communication with the first terminal is performed using the superimposed signal, and a second period in which communication with the second terminal is performed using the superimposed signal, and the first terminal and the second terminal are In the meantime, communication is performed in a time sharing manner using the above overlapping signals.

In the communication system, it is preferable that the second terminal is configured to limit the period in which the superimposed signal is received to the section in which the second period is allocated among the plurality of sections.

In the communication system, it is preferable that the part of the plurality of sections is allocated to the section in which the first period is longer than the second period in the first frame of the transmission signal. The first period and the second period.

In the communication system, it is more preferable that the transmission signal is connected to the above The plurality of intervals include an interrupt band for detecting an interrupt signal by the host, and a time slot that is received by the host to return data. If the host detects the interrupt signal in the interrupt band, the reply band The backhaul data is secured for use from the source of the interrupt signal, and the primary request unit transmits the one-time request by the acknowledged reply band by transmitting the interrupt signal.

In the communication system, it is preferable that the one-time request unit transmits the interrupt signal using the superimposed signal.

Further, in the communication system, preferably, the transmission signal is included in a portion of the plurality of intervals, and includes a transmission band for transmitting data by the host, and a time slot, that is, a reply band, for receiving back data by the host, And an interruption zone for detecting an interrupt signal by the host and a short detection zone for detecting a short circuit by the host, wherein the plurality of sections are apart from the transmission zone, the return tape, the interruption zone, and the short detection zone The section in which the overlapping signal can be superimposed is an overlapable band, and the overlapable band is allocated to the first period and the second period.

In the communication system, it is preferable that the host has a processing unit that receives the one-time response transmitted from the primary response unit to the first terminal and performs a specific process.

In the communication system, it is preferable that the specific processing includes at least one of: the host stores the data acquired from the second terminal as the primary response in a memory unit; and the host system obtains The statistics of the data obtained from the second terminal in response to the above one response.

In the communication system, it is preferable that the second terminal periodically transmits the acquired data to the host, and the secondary requesting unit transmits the secondary request for requesting the acquired data when receiving the one-time request. When the secondary response is received by the primary response unit, the primary response unit transmits the acquired data to the first terminal as the primary response.

The terminal device of the present invention is characterized in that, in the communication system, at least one of the first terminal and the second terminal, and the one-time requesting unit transmits the one-time request to the host; The primary response unit, when receiving the secondary request transmitted from the host when the host receives the one-time request, directly transmits the primary response to the terminal device of the other party without passing through the host.

1‧‧‧Transportation unit

2‧‧‧Overlapping terminal

3‧‧‧Communication terminal

4‧‧‧Lighting appliances

6‧‧‧Measurement unit

7‧‧‧ display panel

10‧‧‧Communication line

11‧‧‧Transportation and Communication Department

12‧‧‧Send Department

13‧‧‧ Receiving Department

14‧‧‧Memory Department

15‧‧‧Control Department

16‧‧‧Overlap Communication Department

21‧‧‧ memory

22‧‧‧Overlap Communication Department

23‧‧‧Transportation and Communication Department

24‧‧‧ face

25‧‧‧Control Department

101‧‧‧Alternate Interrupt Zone

102‧‧‧ spare belt

103‧‧‧Send belt

104‧‧‧Reply belt

105‧‧‧Interrupted belt

106‧‧‧Short-circuit detection zone

107‧‧‧Pause zone

151‧‧‧Second Request Department

152‧‧‧Secondary Response Department

153‧‧‧Processing Department

201‧‧‧1st terminal

202‧‧‧2nd terminal

251‧‧‧One request department

252‧‧‧Responsive Department

F1‧‧‧1st frame

F2‧‧‧2nd frame

F3‧‧‧3rd frame

S11~S16‧‧‧Steps

S21~S24‧‧‧Steps

S31~S33‧‧‧Steps

T1‧‧1 period 1

T2‧‧‧2nd period

Fig. 1 is a block diagram showing a schematic configuration of a communication system according to a first embodiment.

Fig. 2 is a system configuration diagram of a communication system of a basic configuration.

Fig. 3 is a block diagram showing a schematic configuration of a communication system of a basic configuration.

Fig. 4 is an explanatory diagram of the operation of the communication system of the basic configuration.

Fig. 5 is an explanatory diagram of the operation of the communication system of the basic configuration.

Fig. 6 is an explanatory diagram showing the operation of the communication system of the first embodiment.

Fig. 7 is an explanatory diagram showing the operation of the communication system of the second embodiment.

(basic composition)

For example, as shown in FIG. 2, the communication system of the basic configuration includes a transmission unit 1, an overlapping terminal 2, and a communication terminal 3 connected to the 2-wire communication line 10. In the communication system, basically, the communication terminal 3 performs communication using the transmission signal (the first protocol signal) transmitted in the communication line 10, and the overlapping terminal 2 uses the superimposed signal superimposed on the transmission signal (the second agreement) Communication). The superimposed signal is a signal superimposed on the transmission signal, that is, a signal transmitted in the communication line 10 so as to overlap the transmission signal, and the communication line 10 generates a signal obtained by synthesizing the transmission signal and the superimposed signal.

Fig. 2 shows an example in which a communication system is applied to an illumination system for controlling the lighting fixture 4 in an office building or the like. In the example of FIG. 2, the transmission unit 1 is provided in each area (for example, each floor), and is connected to the communication line 10 connected to each transmission unit 1, and each of the plurality of communication terminals 3 is connected and overlapped. Terminal 2.

Further, the transmission unit 1 is connected to an energy saving controller (not shown) serving as a higher-level device. The energy-saving controller is provided for each area (for example, a floor), and in addition to the lighting system to which the communication system is applied, the air conditioner (not shown) is generally monitored and controlled. The energy-saving controllers of the plurality of areas are connected to a personal computer (not shown) having a browser function via a network such as the Internet or a LAN (Local Area Network), and can be monitored from a personal computer.

In the communication system of the basic configuration, the transmission unit 1 has a function of communicating with each communication terminal 3 using a transmission signal, and a function of communicating with each overlapping terminal 2 using an overlap signal. Therefore, the communication terminals 3 can communicate with each other by interposing the transmission unit 1 therebetween, and the overlapping terminals 2 can communicate with each other by interposing the transmission unit 1 therebetween.

The plurality of communication terminals 3 connect the transmission units 1 in parallel via the communication line 10. The transmission unit 1 and the communication terminal 3 are configured to construct a time-division multiplex transmission system for data transmission from the transmission unit 1 to the communication terminal 3 and data transmission from the communication terminal 3 to the transmission unit 1 (hereinafter referred to as " Basic system"). Hereinafter, the schematic configuration of the basic system will be described first.

In the basic system, the communication terminal 3 is classified into two types: a monitoring terminal that monitors a monitoring input input from a switch (not shown) such as a wall switch, and a control terminal that has a relay (not shown). The on/off control of the load (here, the lighting fixture 4) is performed. In the basic configuration, a case where the plurality of monitoring communication terminals 3 and the control communication terminal 3 are connected to the same communication line 10 will be described as an example. Here, the communication terminal 3 memorizes the address of itself, which is individually assigned in advance, in each memory (not shown). Further, the monitoring communication terminal 3 is not limited to the switch, and may be configured to monitor a monitoring input automatically generated by a sensor such as a human body sensor or a brightness sensor.

As shown in FIG. 3, the transmission unit 1 includes a transmission communication unit 11 that transmits a transmission signal to the communication line 10, a transmission unit 12 that transmits data to the communication terminal 3, a reception unit 13 that receives data from the communication terminal 3, a storage unit 14, and Control unit 15. Also, in the basic configuration, the transmission unit 1 further includes an overlap communication unit 16 that communicates using an overlap signal not only in communication with the communication terminal 3 but also between the terminal and the overlap terminal 2. The control unit 15 controls the operations of the transmission communication unit 11, the transmission unit 12, the reception unit 13, and the overlap communication unit 16. In the basic configuration, the transmission unit 1 is mainly constituted by a microcomputer (microcomputer), and executes a program stored in the memory unit 14, thereby realizing the functions of the respective units. In addition, in FIG. 3, the illustration of the communication terminal 3 is abbreviate|omitted.

The transmission unit 1 stores a control table in which the monitoring communication terminal 3 and the control communication terminal 3 are associated with each other in the memory unit 14 based on the address. However, for example, when the monitoring communication terminal 3 has a switch of a plurality of circuits, it is impossible to distinguish each of the switches of the plurality of circuits in the communication terminal 3 by only the terminal address unique to the communication terminal 3. That is, all of the switches of the plurality of circuits in the communication terminal 3 correspond to the terminal addresses unique to the communication terminal 3, and only the terminal address can be used to specify the only switch that is actually operated.

In this case, in the monitoring communication terminal 3, a load number is assigned to each switch so that the only switch that is actually operated can be specified, and the address of the load number is added after the terminal address of the communication terminal 3. The address (identification code) inherent to the switch. Similarly, in the control communication terminal 3, a load number is assigned to each relay, and an address of the load number is added after the terminal address of the communication terminal 3 as a relay-specific address (identification code). The control table associates the address inherent to the switch with the address inherent to the relay in a one-to-one or one-to-many manner.

Next, the operation of the basic system will be described.

The transmission unit 1 repeatedly transmits the transmission signal of the time sharing method to the communication line 10. As shown in FIG. 4, the transmission signal includes a voltage waveform in the form of a plurality of intervals in the time axis direction for each frame. That is, the transmission signal includes the standby interrupt band 101, the spare tape 102, the transmission belt 103, the reply tape 104, the interruption band 105, the short-circuit detection band 106, and the two sections (period) of the pause band 107 (±24 V) Time-division multiplex signal.

The spare interrupt band 101 is used to transmit the unit 1 for detecting the presence or absence of two interruptions. The belt 102 is set in accordance with the interruption belt 105 and the short detection belt 106, and the transmission belt 103 is a period in which the transmission unit 1 transmits data to the communication terminal 3. The replying band 104 is a time slot in which the transmitting unit 1 receives the returned data from the communication terminal 3. The interrupting band 105 is used to detect the presence or absence of the following interrupt signal. The short detecting band 106 is used by the transmitting unit 1 to detect During the short circuit. The pause zone 107 is used for periods when it is too late to process.

Further, when the transmission unit 1 detects that an interrupt signal is detected in the interrupt band 105, the first transmission band 103 and the reply band 104 thereafter communicate with the communication terminal 3 which is the source of the interruption signal. Therefore, the basic configuration is such that the transmission signal starts from the interruption band 105 and is set to the 1-frame (F1, F2, ...) in each period in which the reply band 104 ends. However, the original spare interrupt band 101 and the spare tape 102 are set as the start pulse, and the interrupt band 105 and the short detection band 106 are set as the end pulse interval, so the spare interrupt band can also be used. The period from 101 to the short detection band 106 is set to 1 frame. In this case, the pause band 107 is the interval between the frames of the signal transmission, and the transmission signal is divided into a plurality of intervals in the time axis direction for each period in which the signal is added to the frame.

The transmission unit 1 normally transmits a transmission signal in which the mode data is the normal mode, performs a regular round of periodically changing the address data contained in the transmission band 103 of the transmission signal, and sequentially accesses the communication terminal 3. Polling. In the case of the conventional polling, the communication terminal 3, which has the address data contained in the transmission strip 103 and its own address, receives the data contained in the transmission belt 103, and thereafter the initial (the same frame) replies 104 transmits a backhaul data to the transmission unit 1. Here, the communication terminal 3 transmits the backhaul data by a signal of a current mode synchronized with the return band 104 of the transmission signal (a signal sent by short-circuiting the communication line 10 via a suitable low impedance). Furthermore, the power supply of the internal circuit of the communication terminal 3 is supplied by rectifying and stabilizing the transmission signal transmitted via the communication line 10.

On the other hand, when the monitoring communication terminal 3 detects the monitoring input, the monitoring communication terminal 3 generates an interrupt signal in synchronization with the interruption band 105 of the transmission signal. Hereinafter, the operation of the basic system when the interrupt signal is generated in the monitoring communication terminal 3 in the communication system of FIG. 2 will be described with reference to FIG. Be explained.

When the transmission unit 1 detects the interrupt signal generated by the monitoring communication terminal 3 in the interrupt band 105 of the first frame F1 of the transmission signal (S11 in FIG. 4), the transmission mode includes the mode data contained in the transmission band 103. Switch from normal mode to interrupt polling mode. In the interrupt polling mode, the transmission unit 1 transmits the first backhaul request data including the high-order bit of the address in the transmission band 103 of the transmission signal by the transmitting unit 12 (S12), and makes the address ( High-order bits are periodically changed to perform address retrieval. The communication terminal 3 that generates the interrupt signal is configured to return the address of the address in the first frame F1 as long as the address (high-order bit) in the returned request data coincides with the high-order bit of the address of the first frame F1. The lower order bit is transmitted to the transmission unit 1 as a backhaul data (S13). Thereby, the transmission unit 1 receives the address (lower order bit) of the communication terminal 3 that generated the interrupt signal in the first frame F1 as the first backhaul data, and is received by the receiving unit 13.

When the transmission unit 1 acquires the address of the communication terminal 3 that generates the interrupt signal, the transmission unit 1 specifies the address, and the transmission unit 103 in the second frame F2 transmits the second return request data from the transmission unit 12 to the communication terminal 3. (S14). When the communication terminal 3 receives the return request data including the address of itself, the communication terminal 3 responds to the reply band 104 of the second frame F2, and turns on or off the load number including the switch corresponding to the monitor input. The monitoring data is transmitted to the transmission unit 1 as a return data (S15).

When the transmission unit 1 receives the second return data including the monitoring data by the receiving unit 13, the transmission unit 103 in the third frame F3 controls the communication terminal corresponding to the monitoring data on the control table. 3 Transmit control data (S16). The communication terminal 3 that has received control of the control data performs on/off control of the lighting fixture 4 based on the control data.

As described above, the basic system communication terminals 3 (the monitoring terminal and the control terminal) communicate via the transmission unit 1 in accordance with the agreement (first agreement) of the polling/selection method.

In addition, in the communication system of the basic configuration, the overlapping terminal 2 as the terminal device The communication line 10 is shared with the above-described basic system, and communication is performed using an overlapping signal superimposed on the transmission signal.

As shown in FIG. 3, the superimposing terminal 2 includes a memory 21, a (terminal side) overlapping communication unit 22 that performs communication using overlapping signals, a (terminal side) transmission communication unit 23 that can receive at least a transmission signal, and a dielectric surface portion 24, And (terminal side) control unit 25. On the interface 24, the following measurement unit 6 and the like are connected. The control unit 25 controls the operations of the superimposed communication unit 22, the transmission communication unit 23, and the interfacial portion 24. In the basic configuration, the superimposed terminal 2 performs a function of the respective units by executing a program stored in the memory 21 with a microcomputer as a main configuration.

Here, the superimposed signal is a signal having a sufficiently high frequency compared to the transmitted signal, and the amount of data that can be transmitted per frame (of the transmitted signal) is sufficiently large. Therefore, the communication using the overlap signal can speed up the communication speed as compared with the communication using the transmission signal, and is suitable for the transmission of information having a relatively large amount of data such as an analog quantity. Therefore, in the basic configuration, the superimposing terminal 2 transmits the measurement result of the measurement unit (multiple circuit energy monitor) 6 that measures voltage, current, electric power, and the like.

Specifically, the plurality of overlapping terminals 2 are classified into a monitoring terminal connected to the measuring unit 6 and a display terminal electrically connected to the display panel (floor integrated panel) 7 of the measurement result of the display measuring unit 6. The display panel 7 displays the measurement results of the measurement unit 6 in various forms such as a table or a chart. Hereinafter, the display overlapping terminal 2 will be referred to as the first terminal 201, and the monitoring overlapping terminal 2 will be referred to as the second terminal 202.

In addition, this basic configuration assumes that a plurality of first terminals 201 and second terminals 202 are connected to the same communication line 10. However, as long as at least the second terminal 202 has a plurality of stations, the first terminal 201 may be only one. In addition, although the first terminal 201 is integrated with the display panel 7 by being housed in a casing shared with the display panel 7, the present invention is not limited to this configuration, and may be housed in a casing different from the display panel 7. The interface 24 is connected to the display panel 7. Conversely, the second terminal 202 and the measurement unit 6 are different bodies, but are not limited to the structure. The integration can also be integrated with the measurement unit 6.

According to the configuration described above, the second terminal 202 can periodically transmit the measurement result of the measurement unit 6 to the first terminal 201 using the superimposed signal, and display the measurement result of the measurement unit 6 on the display panel 7. Further, the display panel 7 has a touch panel display (not shown) and is configured to display information desired by the user by accepting an operation input from the user. Therefore, the first terminal 201 can issue a request based on the user's operation input to the display panel 7, and display the measurement result of the measurement unit 6 acquired from the second terminal 202 on the display panel 7 as a response to the request.

Here, the overlapping terminal 2 memorizes the address of itself which is individually assigned in advance in each memory 21. However, the communication terminal 3 is distinguished from the addressable area that can be set in the overlapping terminal 2. In the following, it is assumed that the address of "1" to "128" can be used as the entire communication system, and "1" to "64" are assigned as the address area of the communication terminal 3, "65"~ "128" is assigned as the address area of the overlapping terminal 2.

Further, in the case where a plurality of sensors or loads are connected to one overlapping terminal 2, the overlapping terminal 2 is not assigned an address unique to the overlapping terminal 2, but is assigned to each sensor or The address inherent to the load. In other words, for the overlapping terminal 2 to which, for example, four sensors (the measuring unit 6 and the like) are connected, a total of four addresses are assigned as in "65", "66", "67", and "68".

Further, the superimposed terminal 2 of the basic configuration is configured such that, similarly to the communication terminal 3, the transmission communication unit 23 performs bidirectional communication using the transmission signal with the transmission unit 1. That is, the overlapping terminal 2 can realize not only communication using overlapping signals but also communication with the transmission unit 1 using the transmission signals.

Further, the superimposing terminal 2 has a function of monitoring a transmission signal used in the basic system and analyzing a data transmission state (hereinafter referred to as a "state") of the transmission signal. Here, the overlapping terminal 2 monitors the transmission signal by the transmission communication unit 23. The overlapping terminal 2 determines whether or not it is located in an overlapable band suitable for overlapping of overlapping signals based on the analysis result of the state, and determines that The timing of the overlapping bands can be superimposed on the transmission signal by the overlapping communication unit 22. That is, the superimposing terminal 2 is configured to communicate with the transmission signal transmitted from the transmission unit 1 as the host to the communication line 10 in synchronization. Therefore, the transmission unit 1 can use the transmission signal as the synchronization signal without sending a synchronization signal which is only synchronized with the communication using the overlapping signal.

In the basic configuration, the overlapping terminal 2 basically uses the spare interrupt band 101, the spare tape 102, and the pause band 107 in the transmission signal as overlappable bands for overlapping of overlapping signals. The spare interrupt band 101, the spare band 102, and the pause band 107 are in the following sections: even if overlapping signals are superimposed, the communication of the first protocol is not affected, and the overlapping signals are not easily affected by the transmission signals.

Further, similarly to the communication terminal 3, the superimposing terminal 2 is configured to generate an interrupt signal in synchronization with the interrupt band 105 for transmitting a signal, and the reply tape 104 secured by the interrupt signal can be used as an overlapable band. Overlap of overlapping signals. That is, the overlapping terminal 2 can also realize the communication using the transmission signal in the transmission communication unit 23, so that the interrupt signal is generated by using the transmission signal in synchronization with the interruption band 105, thereby ensuring the initial (the same frame) reply band thereafter. 104 is used for communication with the transmission unit 1 itself. The overlapping terminal 2 uses the replying tape 104 secured in this manner as an overlapable band, whereby interference between the backhaul data and the overlapping signal transmitted from the communication terminal 3 to the transmission unit 1 by the replying tape 104 can be avoided.

If the interrupt signal is detected in the interrupt band 105, the transmission unit 1 receives the return data from the transmission source of the interrupt signal, and transmits the request back data back. Pass the request information. The communication terminal 3 transmits the return data of the reply band 104 only when the condition that the interrupt signal is generated by itself and the condition for receiving the return request data from the transmission unit 1 after the interruption signal is generated is satisfied. Therefore, when the overlap terminal 2 generates an interrupt signal, the communication terminal 3 does not satisfy the condition required for the transmission of the backhaul data of the interrupt signal generated by itself, and therefore does not transmit the backhaul data on the reply band 104. As a result, in the reply band 104, the return data from the terminal (overlapping terminal 2 or communication terminal 3) other than the overlapping terminal 2 in which the interrupt signal is generated by the interrupt band 105 is prohibited. send. In other words, the reply band 104 is secured for the backhaul data (overlapping signal) from the overlapping terminal 2 that generated the interrupt signal.

Similarly to the other overlapable bands, the reply tape 104 does not affect the communication of the first protocol even if the overlapping signals are superimposed, and the overlap signal is less susceptible to the transmission signal. Moreover, the reply band 104 is longer than the spare interrupt band 101, the spare tape 102, or the pause band 107, and the voltage of the transmission signal is kept fixed for a long period of time, and the ratio of the occupied signal in the frame of the transmission signal is large. It is therefore suitable for overlapping of overlapping signals. Furthermore, if a specific value is exemplified, the time width of the replying tape 104 is about 6.5 ms, and if the overlapping terminal 2 is configured to transmit 350 bits of data in the primary covering tape 104 by the overlapping signal, the signal will be transmitted. The frame period is set to about 15 ms, and the transmission speed is about 23 kbps.

The other sections (the transmission band 103, the interruption band 105, and the short-circuit detection band 106) are relatively short in the time when the transmission signal is stabilized to a high level or a low level, and if the overlapping signals are superimposed, it is easy to affect the communication of the first protocol. Further, if the superimposed signal is superimposed on the other sections, the superimposed signal is also susceptible to signals (interrupt signals or transmission data) transmitted and received between the transmission unit 1 and the communication terminal 3. Therefore, in the basic configuration, the sections other than the spare interruption zone 101, the spare tape 102, the pause zone 107, and the reply zone 104 are not used in the overlapping section of the overlap signal (hereinafter, referred to as "non-overlapping zone" ").

The superimposed communication unit 22 functions as a data transmitting unit that transmits data by overlapping signals and a data receiving unit that receives data transmitted by overlapping signals. The superimposed communication unit 22 is configured to transmit an overlap signal only when it is determined that the overlapable band is determined based on the analysis result of the state. The superimposed terminal 2 superimposes the superimposed signal only on the superimposable band in synchronization with the transmission signal as described above, thereby avoiding interference between the communication of the first protocol of the shared communication line 10 and the communication of the second protocol.

Furthermore, the period of rise and fall of the transmission signal is also unsuitable for superimposing the overlapping signals due to the influence of high frequency noise or the transient response accompanying the voltage inversion of the signal. Therefore, the overlapping terminal 2 is in the spare interrupt zone 101, the spare tape 102, the pause zone 107, and the reply tape In 104, it is also determined that the specific avoidance time (for example, 300 μs) after the switching (rise) of the interval is a non-overlapping band.

Similarly to the communication terminal 3, the power supply system to the superimposing terminal 2 is performed by the following method (centralized power supply method): the transmission signal transmitted from the transmission unit 1 via the communication line 10 is rectified and stabilized by each overlapping terminal 2 And supply. However, the present invention is not limited to this configuration, and the power supply to the superimposing terminal 2 can be performed by rectifying and stabilizing the commercial power supply by the respective overlapping terminals 2 by the following method (local power supply method).

Further, in the communication system of the basic configuration, the transmission unit 1 has a sovereign right for functioning as a master node that directly communicates with the overlapping terminal 2 using an overlap signal. In the communication system, each of the overlapping terminals 2 is not freely communicable with other overlapping terminals 2 using overlapping signals, but can communicate directly with only the master node having sovereignty.

Therefore, when data is transmitted between the first terminal 201 and the second terminal 202, the transmission unit 1 acquires data from the first terminal 201 by using the superimposed signal by the superimposed communication unit 16, thereby using the superimposed signal to the second terminal. 202 sends the data. In other words, in the normal case where the transmission unit 1 functions as a master node, the overlapping terminals 2 as terminal devices communicate with each other via the transmission unit 1, and do not directly communicate with each other.

As a specific configuration for this purpose, as shown in FIG. 3, the first terminal 201 has a primary request unit 251, and the second terminal 202 has a primary response unit 252, and the transmission unit 1 as a master node (host) has a secondary request. Part 151 and secondary response unit 152. Here, since the terminal devices having the same configuration are used in the first terminal 201 and the second terminal 202, the primary request unit 251 and the primary response unit 252 are provided in each of the first terminal 201 and the second terminal 202. Both. However, when the terminal device having a different configuration is used in the first terminal 201 and the second terminal 202, the first terminal 201 may not have the primary response unit 252, and the second terminal 202 may or may not be present. The request unit 251 is used once.

The primary request unit 251 is provided in the control unit 25 and has a transmission list as a master node. Element 1 sends the request function once. Here, the one-time request is a signal for specifying the type of the data to be transmitted by the second terminal 202, for example, specifying which measurement unit 6 is to be requested.

The secondary request unit 151 is provided in the control unit 15 of the transmission unit 1, and has a function of transmitting a secondary request to the second terminal 202 when receiving a request from the first terminal 201. Here, the secondary request is a signal that reflects the content of one request, and specifies the type of the data to be transmitted by the second terminal 202, for example, which measurement unit 6 is requested to be requested.

The primary response unit 252 is provided in the control unit 25, and has a function of transmitting a response to the transmission unit 1 as the master node when receiving the secondary request from the transmission unit 1. Here, the response of the primary response to the secondary request includes the information requested from the first terminal 201, for example, the measurement result of the measurement unit 6.

The secondary response unit 152 is provided in the control unit 15 of the transmission unit 1 and has a function of transmitting a secondary response to the first terminal 201 when receiving a response from the second terminal 202. Here, the secondary response reflects the content of the primary response, and includes the information requested from the first terminal 201, for example, the measurement result of the measurement unit 6.

In the basic configuration, the one-time request, the second request, the primary response, and the secondary response are transmitted using an overlapping signal. In other words, the primary request unit 251 transmits the request once from the overlapping communication unit 22, and the secondary request unit 151 performs the request reception and the secondary request transmission by the overlapping communication unit 16. The primary response unit 252 performs the reception of the secondary request and the transmission of the primary response by the overlapping communication unit 22, and the secondary response unit 152 performs the reception of the primary response and the transmission of the secondary response by the overlapping communication unit 16.

Furthermore, in the basic configuration, the overlapping terminal 2 includes the transmission communication unit 23 and also corresponds to the communication using the transmission signal. Therefore, at least one of the primary request, the secondary request, the primary response, and the secondary response may be used. Send using overlapping signals.

Hereinafter, the operation of the communication system of the basic configuration will be described with reference to Figs. 3 and 5 . Here, the first terminal 201 accepts an operation input from the user to the display panel 7, and The operation when the second terminal 202 acquires the measurement result of the current (immediate) measurement unit 6 (for example, the instantaneous value of power consumption) will be described as an example.

The first terminal 201 receives an operation input from the user to the display panel 7, and generates an interrupt signal in synchronization with the interrupt band 105 for transmitting a signal (S11 of Fig. 5). The transmission band 1 of the transmission unit 1 that has detected the interrupt signal thereafter transmits the backhaul request data by transmitting the signal (S12 of Fig. 5). The first reply band 104 of the first terminal 201 that generates the interrupt signal thereafter transmits a request to the transmission unit 1 using the overlap signal (S21 of Figs. 3 and 5).

The transmission unit 1 that has received the request transmits the overlap signal to the second terminal 202 in synchronization with the subsequent pause band 107, the backup interrupt band 101, and the spare tape 102, and requests the measurement unit 6 to be requested according to one request. The second request for measurement results (S22 of Figures 3 and 5). The second terminal 202 that has received the secondary request from the transmission unit 1 synchronizes the measurement result of the measurement unit 6 with the subsequent pause band 107, the spare interrupt band 101, and the spare tape 102 as a response by overlapping signals. It is sent to the transmission unit 1 (S23 of Fig. 3). Upon receiving the primary response (measurement result) from the second terminal 202, the transmission unit 1 overlaps the measurement result as a secondary response in synchronization with the first pause zone 107, the backup interruption zone 101, and the backup zone 102 thereafter. The signal is transmitted (transmitted) to the first terminal 201 (S24 of Fig. 3).

In this way, the first terminal 201 can acquire the measurement result of the measurement unit 6 from the second terminal 202 via the transmission unit 1 as the master node. At this time, communication between the transmission unit 1 and the superimposed terminal (the first terminal 201 and the second terminal 202) 2 is performed in four steps of S21 to S24 as described above. That is, a request from the first terminal 201 to the transmission unit 1, a second request from the transmission unit 1 to the second terminal 202, a response from the second terminal 202 to the transmission unit 1, and a first transmission from the transmission unit 1 to the first The communication of the four steps of the second response of the terminal 201.

As described above, the communication system of the basic configuration is such that the overlapping terminals 2 communicate with each other via the transmission unit 1 as the master node. Therefore, it is possible to prevent the overlapping signals from interfering with each other by the plurality of overlapping terminals 2 communicating together. That is, according to this basic structure, there is no sovereignty. The overlapping terminal 2 is not free to communicate using the overlapping signal, but can only communicate directly with the transmission unit 1 which is the only master node within the communication system. In other words, the communication using the superimposed signal in the communication system is collectively managed by the transmission unit 1 having sovereignity, and therefore there is no case where the overlapping terminal 2 arbitrarily performs communication using the overlapping signal. Therefore, the communication system of the present embodiment can avoid the occurrence of collisions between overlapping signals caused by data transmission by the plurality of overlapping terminals 2 in the same overlapable band.

Further, in the basic configuration, the transmission unit 1 can store the data acquired from one overlapping terminal (second terminal 202) 2 in the storage unit 14 and transmit the data to the plurality of overlapping terminals (first terminal 201) 2. Therefore, the transmission unit 1 is configured to communicate with the second terminal 202 when the first terminal 201 communicates with the second terminal 202, for example, when the data acquired by the second terminal 202 (the measurement result of the measurement unit 6) is shared between the plurality of first terminals 201. Compared, it can reduce traffic. Further, for example, when the second terminal 202 has a plurality of stations, if the second terminal 202 is grouped in a plurality of units in the transmission unit 1, the first terminal 201 can request the data by specifying the group. The plurality of second terminals 202 collectively request information. That is, in the case of performing transmission and reception of data between the one-to-many overlapping terminals 2, the communication system can reduce the amount of communication by causing the transmission unit 1 to function as a master node.

(Embodiment 1)

As shown in FIG. 1, the communication system of the present embodiment includes a transmission unit (host) 1 connected to the communication line 10, and a first terminal 201 and a second terminal 202 connected to the communication line 10 and communicating with the transmission unit 1, respectively. Communication system.

The first terminal 201 has a request unit 251 that transmits a request once to the transmission unit 1 as a host.

The transmission unit 1 has a secondary request unit 151 that transmits a secondary request to the second terminal 202 if it receives a request once.

The second terminal 202 has a primary response unit 252 that, when receiving the secondary request, directly transmits a response to the first terminal 201 without passing through the transmission unit 1.

The secondary requesting unit 151 may be configured to determine whether or not the specific condition is satisfied in communication with the first terminal 201 and the second terminal 202 of the source of the primary request, and to determine based on the determination result, if the request is received once. Whether to send a second request.

The specific condition may include at least one of the following: the first terminal 201 of the transmission source of one request is registered as the member in the transmission unit 1; and when receiving the request, the transmission unit 1 does not communicate with other terminals. in. The other terminal as used herein refers to a terminal other than the first terminal 201 of the transmission source of one request.

Further, the first terminal 201 and the second terminal 202 may be configured to communicate with the synchronization signal sent from the transmission unit 1 to the communication line 10 in synchronization.

Preferably, the host computer transmits the transmission unit 1 as a transmission signal of the synchronization signal to the communication line 10, and the first terminal 201 and the second terminal 202 use the overlapping terminal that communicates with the superimposed signal of the transmission signal.

Moreover, the transmission signal can also be divided into a plurality of intervals in the time axis direction for each frame. In this case, the transmission unit 1 preferably allocates one of the plurality of sections to the first period in which the communication with the first terminal 201 is performed using the superimposed signal, and performs the second terminal using the superimposed signal. The second period of communication of 202. The transmission unit 1 is configured to perform communication in a time-sharing manner using overlapping signals with the first terminal 201 and the second terminal 202.

In the communication system, the second terminal 202 may be configured to limit the period in which the superimposed signal is received to the section in which the plurality of sections are allocated as the second period.

Further, in the communication system, the portion of the plurality of sections may be allocated to the first period and the period in which the first period is longer than the second period in the frame of the transmission signal. The second period.

In the communication system, the transmission signal may also be in the plurality of intervals, including an interrupt band for detecting the interrupt signal by the transmission unit 1, and a time slot, that is, a reply band, for receiving the return data at the transmission unit 1. In this case, if the transmission unit 1 detects the interruption letter in the interruption band No., the reply band is guaranteed to be used for the backhaul data from the source of the interrupt signal. The one-time request unit 251 is preferably configured to transmit a request once by the acknowledgment band by transmitting the interrupt signal.

Further, in this case, the primary request unit 251 may be configured to transmit an interrupt signal using an overlap signal.

Further, the transmission unit 1 may include a processing unit 153 that receives a response from the primary response unit 252 to the first terminal 201 and performs a specific process.

The specific processing may include at least one of the following: the transmission unit 1 stores the data acquired from the second terminal 202 as a primary response in the storage unit 14; and the transmission unit 1 obtains the second response as the primary response. Statistics of the data acquired by the terminal 202.

Furthermore, the second terminal 202 may periodically transmit the acquired data to the transmission unit 1, and if the secondary request unit 151 receives the request once, the secondary request unit 151 may transmit a secondary request for acquiring the data to the second terminal 202. In this case, the primary response unit 252 may be configured to transmit the acquired data to the first terminal 201 as a primary response when receiving the secondary request.

In the communication system described above, the terminal device (overlapping terminal 2) serving as at least one of the first terminal 201 and the second terminal 202 has a request request unit 251 and a primary response unit 252 that transmit a request to the transmission unit 1 once. When the primary response unit 252 receives the secondary request transmitted from the transmission unit 1 when the transmission unit 1 receives the request, the primary response unit 252 directly transmits the response to the terminal device of the other party without passing through the transmission unit 1.

Hereinafter, the communication system of the present embodiment and the terminal device used in the communication system will be described in detail.

In the present embodiment, the first terminal 201 and the second terminal 202 are configured in common, and when the first terminal 201 and the second terminal 202 are not particularly distinguished, they are collectively referred to as "overlapping terminal 2".

The communication system of the present embodiment is different from the communication system of the basic configuration in that the primary response unit 252 of the overlapping terminal (second terminal 202) 2 does not pass through the transmission unit as the host. 1 and a response is directly transmitted to the first terminal 201. In the following, the same components as the basic configurations are denoted by the same reference numerals, and the description thereof will be appropriately omitted.

In other words, in the present embodiment, the transmission unit 1 as the master does not need to receive a response from the second terminal 202 and transmits a secondary response to the first terminal 201. Therefore, as shown in FIG. 1, the control unit of the self-transport unit 1 The secondary response unit 152 (see FIG. 3) is omitted.

Specifically, the first terminal 201 is configured to directly receive the primary response of the primary response unit 252 of the second terminal 202 to the transmission unit 1 as the host without passing through the transmission unit 1. In other words, the first terminal 201 waits in a state of receiving the superimposed signal transmitted from the second terminal 202 within a specific time period after the primary request unit 251 transmits the request once, thereby directly receiving the transmission from the second terminal 202. response.

Therefore, the first terminal 201 transmits a response by overlapping signals to the second terminal 202 that has received the secondary request from the transmission unit 1 in synchronization with the first pause band 107, the spare interrupt band 101, and the spare band 102 thereafter. When responding to a secondary request, the response is received directly. In other words, when the transmission unit 1 as the master device (host) communicates with the second terminal 202 as the slave device, the first terminal 201, which is another slave device, receives the superimposed signal (one response) transmitted and received between the two terminals 201.

Further, in the present embodiment, when the secondary request unit 151 of the transmission unit 1 receives the request once, it determines whether or not the specific condition is satisfied by communicating with the first terminal 201 and the second terminal 202 of the transmission source of the primary request. And based on the judgment result, it is decided whether to send a secondary request. The specific conditions mentioned herein preferably include at least one of the following: the first terminal 201 of the transmission source of one request is registered as the member of the communication system in the transmission unit 1; and upon receiving a request, The transmission unit 1 is not in communication with other overlapping terminals 2.

The transmission unit 1 transmits a secondary request when a specific condition is satisfied, and does not transmit a secondary request when the condition is not satisfied. Therefore, the case where the transmission unit 1 is not in communication with other overlapping terminals 2 when a request is received is set as a specific condition In the case where the transmission unit 1 receives a request from the first terminal 201 in communication with, for example, the second terminal 202, the transmission unit 1 does not satisfy the condition, and therefore does not transmit the secondary request. However, the specific condition is not limited to the above example as long as it is a condition determined in advance for communication with the first terminal 201 of the transmission source of one request and the second terminal 202 of the transmission destination of the secondary request.

Further, the transmission unit 1 is configured to perform a first period in which communication with the first terminal 201 is performed using the superimposed signal in the time axis direction, and a second period in which communication with the second terminal 202 is performed using the superimposed signal. Time-sharing communication. In other words, the transmission unit 1 periodically transmits a synchronization signal (synchronization pulse) such as a beacon periodically, and the first terminal 201 and the second terminal 202 perform time-divisional communication in synchronization with the synchronization signal. Therefore, in the first period in which the communication between the transmission unit 1 and the first terminal 201 is performed, communication between the transmission unit 1 and the second terminal 202 is not performed, and conversely, in the second period, the transmission unit 1 is not Communication is performed between the first terminals 201. Therefore, interference between the superimposed signal used for communication between the transmission unit 1 and the first terminal 201 and the superimposed signal used for communication between the transmission unit 1 and the second terminal 202 can be avoided.

In the present embodiment, the transmission unit 1 uses the transmission signal sent to the communication line 10 as a synchronization signal, and allocates one of the plurality of intervals set for each frame of the transmission signal to the first period and The second period. In the present embodiment, the overlap of the superimposed signals used in the transmission signal is the spare interrupt band 101, the spare tape 102, the pause band 107, and the reply band 104. Therefore, the sections are allocated as the first period and the second period.

Here, the interval of the transmission signal is allocated such that the time occupied by the first period in the second period of the transmission signal becomes longer than the second period. Specifically, as shown in FIG. 6, the cover tape 104 which can realize the overlapable tape relatively long becomes the first period T1, and the remaining spare interruption belt 101, the spare tape 102, and the pause belt 107 become the second. The allocation of the interval is performed in the manner of the period T2. Therefore, the one-time request unit 251 is configured to first secure the reply band 104 by transmitting an interrupt signal and transmit a request to the secured reply band 104 when transmitting a request. In summary, the primary request unit 251 uses the transmission in synchronization with the interrupt band 105. The signal generates an interrupt signal, thereby ensuring that the initial (same frame) reply band 104 is used for the transmission of a request.

As will be described in further detail, if the transmission unit 1 detects an interrupt signal in the interrupt band 105, it transmits a return request data requesting a return of the returned data. The communication terminal 3 is configured to transmit the return data of the reply tape 104 only when the condition that the interrupt signal is generated by itself and the condition for receiving the return request data is received after the interrupt signal is generated. Thereby, the reply band 104 is secured for the return data from the transmission source of the interrupt signal.

As described above, the transmission unit 1 allocates one of the plurality of sections in the transmission signal as the first period and the second period, thereby realizing the first terminal 201 and the first terminal without using a synchronization signal (synchronization pulse) such as a beacon. 2 Time-sharing communication of terminal 202. Moreover, a relatively long interval (repeated band 104) of the overlapable bands of the transmission signals is assigned to the communication between the transmission unit 1 and the first terminal 201, so the first terminal 201 can collectively transmit information having a relatively large amount of information. As a request. Further, the reply band 104 is originally used to receive the time slot of the return data transmitted from the communication terminal 3, but the primary request unit 251 uses the reply band 104 secured by the interrupt signal for the transmission of one request. Thereby, the communication system can avoid the reply band 104 from generating interference from the backhaul data of the communication terminal 3 and the overlapping signal (one request).

Further, since the primary request unit 251 transmits the interrupt signal using the transmission signal, the transmission unit 1 can perform the processing when the overlap terminal 2 receives the interrupt signal in the same manner as the communication terminal 3. That is, the transmission unit 1 does not need to distinguish between the case where the interrupt signal is received from the overlapping terminal 2 and the case where the interrupt signal is received from the communication terminal.

Further, the one-time request unit 251 may be configured to transmit an interrupt signal using the overlap signal. In this case, the interrupt signal is generated by the overlap communication unit 22 in the interrupt band 105 of the transmission signal. The communication using the superimposed signal can speed up the communication speed as compared with the communication using the transmission signal. Therefore, if the primary request unit 251 is an interrupt signal of the same length of time, the one using the overlapping signal can be included as compared with the one using the transmission signal. There is more information on the interrupt signal. Thereby, the first terminal 201 can be transmitted not only to apply an interrupt to the interrupt band 105. The interrupt element can also be transmitted as an interrupt signal together with the interrupt element other than the interrupt element, such as the address or the priority information, so that the communication can be made more efficient.

Here, when the second terminal 202 receives the secondary request from the transmission unit 1, the second terminal 202 does not read the content of the secondary request and performs tunneling of all the data through the measurement unit 6. Therefore, when the second terminal 202 also receives the data from the first terminal 201 and mixes it with the secondary request, there is a case where the data cannot be directly output to the measurement unit 6 in the order of transmission from the transmission unit 1. On the other hand, the second terminal 202 is configured to limit the period in which the superimposed signal is received to the section in which the second period is allocated.

Thereby, the second terminal 202 can limit the data received by the overlapping signal to the data (secondary request) from the transmission unit 1, so that there is no case where the data from the first terminal 201 is erroneously received. Therefore, the second terminal 202 can directly output the data to the measurement unit 6 in the order transmitted from the transmission unit 1.

Hereinafter, the operation of the communication system of the present embodiment will be described with reference to Fig. 1 . Here, the first terminal 201 receives the operation input from the user to the display panel 7 and acquires the measurement result (for example, the instantaneous value of the power consumption) of the current (instant) measurement unit 6 from the second terminal 202. For example, it will be explained.

The first terminal 201 receives an operation signal from the user input to the display panel 7, and generates an interrupt signal. The first reply band 104 thereafter transmits a request to the transmission unit 1 using the overlap signal (S31). The transmission unit 1 that has received the request transmits the measurement to the second terminal 202 by the overlapping signal in synchronization with the initial pause band 107, the backup interruption band 101, and the backup band 102, respectively, to request the measurement unit 6 according to a request. The second request of the result (S32). The second terminal 202 that has received the secondary request from the transmission unit 1 synchronizes the measurement result of the measurement unit 6 with the subsequent pause band 107, the spare interrupt band 101, and the spare tape 102 as a response by overlapping signals. Send to transmission unit 1 (solid line of S33).

At this time, the first terminal 201 directly receives the primary response (measurement result) sent from the second terminal 202 to the communication line 10 via the overlapping communication unit 22 (S33). dotted line). In summary, the first terminal 201 simultaneously receives the primary response transmitted by the second terminal 202 as a response to the secondary request, together with the transmission unit 1. Further, since the transmission unit 1 omits the secondary response unit 152 (see FIG. 3), even if the primary response from the second terminal 202 is received, the secondary response is not transmitted to the first terminal 201.

In this way, the first terminal 201 can acquire the measurement result of the measurement unit 6 from the second terminal 202. At this time, communication between the transmission unit 1 and the superimposed terminal (the first terminal 201 and the second terminal 202) 2 is performed in three steps of S31 to S33 as described above. That is, three requests from the first terminal 201 to the transmission unit 1, two requests from the transmission unit 1 to the second terminal 202, and three responses from the second terminal 202 to the transmission unit 1 and the first terminal 201 are generated. Communication of steps. Therefore, according to the configuration of the present embodiment, the transmission unit 1 and the overlapping terminal (the first terminal 201 and the basic configuration of the communication of the four steps of generating the primary request, the secondary request, the primary response, and the secondary response are performed. The number of communications between the second terminals 202) 2 is reduced, and the communication time is shortened.

According to the configuration of the present embodiment described above, when the request is made from the first terminal 201 to the second terminal 202, the overlapping terminals 2 communicate with each other via the transmission unit 1 as the master node, thereby avoiding overlapping by the plurality of stations. The terminals 2 interfere with each other by the overlapping signals caused by the communication. That is, according to the present embodiment, the overlapping terminal 2 having no sovereignty is not freely communicable by using the overlapping signal, but can communicate directly with the transmission unit 1 which is the only master node in the communication system. In other words, the system having the sovereign transmission unit 1 manages the communication using the overlapping signals in the communication system, so there is no case where the overlapping terminal 2 arbitrarily performs communication using the overlapping signals. Therefore, the communication system of the present embodiment can avoid the occurrence of collisions between overlapping signals caused by data transmission by the plurality of overlapping terminals 2 in the same overlapable band.

Further, in other words, the transmission unit 1 performs traffic sorting in which the overlapping terminals 2 of the communication system communicate with each other, and therefore the communication timing or the order of communication can be controlled even if the number of terminal devices of the communication system increases. That is, in the present embodiment, the transmission unit 1 is connected. Since the flow of the letter is organized, it is possible to avoid the problem that the waiting time becomes extremely long or the communication cannot be performed due to the overlapping of the terminal 2.

If the first terminal 201 directly requests the second terminal 202 without passing through the transmission unit 1, the first terminal 201 exists in a case where the transmission unit 1 and the second terminal 202 are interrupted while communicating, and a superimposed signal is transmitted. In this case, overlapping signals are generated to interfere with each other. On the other hand, in the present embodiment, the first terminal 201 makes a request to the second terminal 202 via the transmission unit 1. Therefore, when the transmission unit 1 is in a situation where interference of overlapping signals occurs, even if a request is received from the first terminal 201, a secondary request is not transmitted to the second terminal 202, thereby avoiding interference of overlapping signals with each other. .

Further, when the secondary request unit 151 of the transmission unit 1 receives the request once, it determines whether or not the specific condition is satisfied by the communication with the first terminal 201 and the second terminal 202 of the transmission source of the primary request, and determines based on the determination result. Whether to send a second request. Specifically, as a specific condition, it is preferable to include at least one of the following cases: the first terminal 201 of the transmission source of one request is registered as the member of the communication system in the transmission unit 1; and when receiving the request, The transmission unit 1 is not in communication with other overlapping terminals 2. Thereby, for example, when the transmission unit 1 transmits a request from the first terminal 201 that is not registered as the member of the communication system to the transmission unit 1, it is determined that the transmission of the secondary request is canceled without satisfying the specific condition. Alternatively, the transmission unit 1 may determine that the second terminal is canceled if the first terminal 201 transmits a request while interrupting communication with another terminal (the second terminal 202 or the communication terminal 3). Send it.

Further, in the communication system according to the present embodiment, the primary response unit 252 directly transmits the response to the first terminal 201. Therefore, when the second terminal 202 responds to the first terminal 201, the overlapping terminals 2 can directly communicate with each other without the transmission unit 1. Communication, thereby suppressing an increase in traffic. In other words, the communication system can reduce the number of communication times between the transmission unit 1 and the overlapping terminals (the first terminal 201 and the second terminal 202) 2 and shorten the communication time as compared with the communication system having the basic configuration, so that the overlapping terminal can be made. The communication speed between the two is speeding up.

In summary, the communication system according to the present embodiment has an advantage of avoiding interference between (overlapping) signals and increasing the communication speed between the overlapping terminals 2.

Further, in the present embodiment, as shown in FIG. 1, the transmission unit 1 as a host has a processing unit 153 for receiving a response from the primary response unit 252 to the first terminal 201. And perform specific processing. The specific processing referred to herein refers to a process of storing, for example, data acquired from the second terminal 202 as a primary response in the storage unit 14 or obtaining statistics of the data acquired from the second terminal 202.

As a result, the communication system of the present embodiment can receive the data from the second terminal 202 by the transmission unit 1 even if the number of communication between the transmission unit 1 and the overlapping terminal (the first terminal 201 and the second terminal 202) 2 is reduced. And perform specific processing. For example, as described in the basic configuration, the transmission unit 1 may store the data acquired from one overlapping terminal (second terminal 202) 2 in the storage unit 14 and the plurality of overlapping terminals (first terminal 201) 2 Transfer.

Further, in the present embodiment, the second terminal 202 periodically transmits the acquired data to the transmission unit 1. The primary request unit 251 transmits a request to the transmission unit 1 as the master node as a trigger for acquiring the acquired data from the second terminal 202. When receiving the request once, the secondary requesting unit 151 transmits a second request for acquiring the data to the second terminal 202. The primary response unit 252 transmits the acquired data corresponding to the content of the secondary request to the first terminal 201 as a one-time response.

In short, the communication between the first terminal 201 and the second terminal 202 is performed by the first terminal 201 acquiring information such as the measurement result of the measurement unit 6 from the second terminal 202 as acquisition data. Therefore, the second terminal 202 normally notifies the transmission unit 1 of the measurement result (electrical energy or the like) of the measurement unit 6 periodically, and when the request is transmitted from the first terminal 201, the measurement unit at the time point can be notified. The measurement result of 6 is notified to the first terminal 201.

However, the communication system according to the present embodiment can acquire not only the first terminal 201 from the second terminal 202 but also the device connected to the second terminal 202 based on an instruction from the first terminal 201 (for example). Control not shown). In this case, the first end The terminal 201 transmits the control command of the device as a single request, and the second terminal 202 transmits the control result of the device as a one-time response.

(Embodiment 2)

In the present embodiment, the transmission signal includes a transmission band, a reply band, an interruption band, and a short-circuit detection band in one of a plurality of sections divided in the time axis direction for each frame. The transmission band is used for the interval in which the transmission unit 1 transmits data, and the reply band is used in the time slot in which the transmission unit 1 receives the returned data. The interrupt band is used to detect the interval of the interrupt signal by the transmission unit 1, and the short-circuit detection band is used to detect the short-circuit interval of the transmission unit 1.

In the present embodiment, a section in which a superimposed signal is overlapped between a transmission band, a reply band, an interruption band, and a short-circuit detection band among a plurality of sections is an overlapable band, and the overlapable band is assigned as The first period and the second period.

Hereinafter, this embodiment will be described in detail.

As shown in Fig. 7, the communication system of the present embodiment is used for the superposition of overlapping signals, but is in the range of the transmission signal except for the transmission band 103, the replying tape 104, the interruption band 105, and the short-circuit detecting band 106. There is a difference from the communication system of the first embodiment. In the following, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be appropriately omitted.

That is, in the present embodiment, the overlapable band of the spare interruption band 101, the spare tape 102, and the pause tape 107 is allocated to the first period of communication between the first terminal 201 and the transmission unit 1, and is used in the first period. 2 Terminal 202 - The second period of communication between the transmission units 1. Specifically, as shown in FIG. 7, the spare zone 102 is set to the first period T1, and the pause zone 107 and the spare interrupt zone 101 are set to the second period T2.

According to the configuration of the present embodiment, the time slot in which the transmission unit 1 receives the backhaul data, that is, the reply band 104 or the like is not used in the transmission unit 1-overlap terminal (the first terminal 201 and the second terminal 202) using the overlapping signal. Communication. Therefore, the communication between the transmission unit 1-overlap terminal (the first terminal 201 and the second terminal 202) 2 using the overlap signal has an advantage that it is difficult to affect the communication between the communication terminal 3 and the transmission unit 1 using the transmission signal. That is, in the back When the overlay 104 performs communication using overlapping signals, the reply band 104 is secured for overlapping signals, so that the communication terminal 3 cannot use the reply band 104 to transmit the backhaul data, and the data transmission delay using the transmitted signal is used. . On the other hand, in the present embodiment, the reply tape 104 is not used in the communication using the overlap signal, and thus it is difficult to delay the data transmission using the transmission signal.

Other configurations and functions are the same as those in the first embodiment.

1‧‧‧Transportation unit

2‧‧‧Overlapping terminal

6‧‧‧Measurement unit

7‧‧‧ display panel

10‧‧‧Communication line

11‧‧‧Transportation and Communication Department

12‧‧‧Send Department

13‧‧‧ Receiving Department

14‧‧‧Memory Department

15‧‧‧Control Department

16‧‧‧Overlap Communication Department

21‧‧‧ memory

22‧‧‧Overlap Communication Department

23‧‧‧Transportation and Communication Department

24‧‧‧ face

25‧‧‧Control Department

151‧‧‧Second Request Department

153‧‧‧Processing Department

201‧‧‧1st terminal

202‧‧‧2nd terminal

251‧‧‧One request department

252‧‧‧Responsive Department

S31~S33‧‧‧Steps

Claims (15)

A communication system comprising: a host connected to a communication line; and a first terminal and a second terminal connected to the host connected to the communication line, wherein the first terminal includes a request to send the request to the host once a requesting unit, wherein the host includes a secondary requesting unit, and the secondary requesting unit transmits a secondary request to the second terminal when receiving the one-time request, wherein the second terminal includes a primary response unit, and the primary response unit receives the second request In the case of the secondary request, the response is directly transmitted to the first terminal without passing through the host. The communication system according to claim 1, wherein the secondary requesting unit determines whether or not the first request and the second terminal communicate with the source of the primary request, if the one-time request is received, The specific condition is met, and based on the judgment result, it is decided whether to send the above secondary request. The communication system of claim 2, wherein the specific condition includes at least one of: the first terminal of the source of the one-time request is registered as a member as the member; and upon receiving the one-time request, The host is not in communication with a terminal other than the above-described first terminal that is the source of the above-mentioned one request. The communication system according to claim 1, wherein the first terminal and the second terminal communicate with each other in synchronization with a synchronization signal sent from the host to the communication line. A communication system according to claim 4, wherein said host system repeatedly transmits a transmission unit as a transmission signal of said synchronization signal to said communication line, said first terminal and said second terminal communicating by using a superimposed signal superimposed on said transmission signal Overlapping terminals. The communication system of claim 5, wherein the transmission signal is divided into a plurality of intervals in a time axis direction for each frame, and the host system allocates a section of the plurality of intervals as use a first period of communication with the first terminal and a second period of communication with the second terminal using the superimposed signal, and between the first terminal and the second terminal Communication is performed in a time sharing manner using the above overlapping signals. The communication system according to claim 6, wherein the second terminal is configured to limit the period in which the superimposed signal is received to the section in which the second period is allocated among the plurality of sections. The communication system of claim 6, wherein the part of the plurality of sections is allocated to the section in which the first period is longer than the second period in the first frame of the transmission signal. The first period and the second period. The communication system of claim 8, wherein the transmission signal is included in the plurality of intervals, and includes an interrupt band for detecting an interrupt signal by the host, and a time slot that is received by the host to return data. And if the host detects the interrupt signal in the interrupt band, the reply band is secured for the backhaul data from a source of the interrupt signal, and the primary request unit is configured to transmit the interrupt signal. Make sure that the above reply strip sends the above request. The communication system of claim 9, wherein the one-time requesting unit transmits the interrupt signal using the superimposed signal. The communication system of claim 6, wherein the transmission signal is in a portion of the plurality of intervals, and includes a transmission band for transmitting data by the host, and a time slot, that is, a reply band, for receiving the returned data by the host, for The interruption detecting band of the host detecting interrupt signal and the short-circuit detecting band for detecting a short circuit by the host, wherein the plurality of sections are apart from the transmission belt, the replying tape, the interruption band, and the short-circuit detecting zone The interval between the sections and the overlapping signals can be overlapped. The overlapable band is assigned to the first period and the second period. The communication system according to claim 1, wherein the host includes a processing unit that receives the one-time response transmitted from the primary response unit to the first terminal and performs a specific process. The communication system of claim 12, wherein the specific processing includes at least one of: the host stores the data acquired from the second terminal as the one-time response in the memory unit; and the host finds the The statistics of the data obtained from the above second terminal in response. The communication system according to claim 1, wherein the second terminal periodically transmits the acquired data to the host, and the secondary requesting unit transmits the secondary request for requesting the acquired data if receiving the one-time request. When the secondary response is received by the primary response unit, the primary response unit transmits the acquired data to the first terminal as the primary response. A terminal device, wherein the communication system according to any one of claims 1 to 14 is used as at least one of the first terminal and the second terminal, and includes: the one-time request unit; The host transmits the one-time request; and the primary response unit receives the secondary response directly from the host without receiving the one-time request from the host when the host receives the one-time request; .