JP5950776B2 - Time division data communication system and time division data communication device - Google Patents

Description

  The present invention has a plurality of communication systems that perform time-division data communication using a frame as a communication unit between a master unit and a slave unit via a communication line, and it is necessary to prevent crosstalk between the communication lines of the communication system. A divided data communication system and a plurality of communication systems for performing time division data communication using a frame as a communication unit between a parent device and a child device via a communication line, and need to prevent crosstalk between the communication lines of the communication system The present invention relates to a time division data communication apparatus used as the parent device in a time division data communication system.

  Examples of measures against crosstalk between a plurality of communication lines in a cable are disclosed in, for example, Japanese Patent Laid-Open No. 10-303872 (Patent Document 1).

  A time division data communication system having a plurality of communication systems for performing time division data communication between a parent device and a child device as communication units via a communication line, and which needs to prevent crosstalk between the communication lines of the communication system Time-division data communication that has a plurality of communication systems that perform time-division data communication using a frame as a communication unit between a master unit and a slave unit via a communication line and that needs to prevent crosstalk between the communication lines of the communication system A time division data communication device used in the system is not disclosed in Patent Document 1, but such a time division data communication system is conventionally a twisted pair wire in a collective cable as illustrated in FIG. Is a time-sharing data communication between the parent device A and the child devices A1, A2,..., And a time-division data communication between the parent device B and the child devices B1, B2,. Is done.

No. 10-303872 (FIG. 2 and its description)

  As illustrated in FIG. 10, time-sharing data communication is performed between the parent device A and the child devices A1, A2,... Using the twisted pair wires in the collective cable as communication lines, and the parent device B and the child devices. When time division data communication is performed between the devices B1, B2,..., Time division data communication between the parent device A and the child devices A1, A2,. When the time division data communication with B2... Overlaps in the same time zone, crosstalk occurs between the communication lines. When crosstalk occurs between communication lines, the crosstalk may cause a communication failure such as a communication error, communication disconnection, and a significant decrease in throughput (effective communication speed).

  Therefore, time-division data that has a plurality of communication systems that perform time-division data communication using a frame as a communication unit between a parent device and a child device via a communication line, and that needs to prevent crosstalk between the communication lines of the communication system. A communication system, and a time division that requires crosstalk between the communication lines of the communication system having a plurality of communication systems that perform time division data communication using a frame as a communication unit between the master unit and the slave unit via the communication line In the time division data communication apparatus used in the data communication system, as illustrated in FIG. 11, both the communication system on the base unit A side and the communication system on the base unit B side have the same length of frame (for example, It is preferable to adjust so that data transmission / reception is performed in frames whose time zones are different between the communication system on the base unit A side and the communication system on the base unit B side.

  The present invention has been made in view of the above situation, and has a plurality of communication systems that perform time-division data communication using a frame as a communication unit between a parent device and a child device via a communication line, A time-sharing data communication system that needs to prevent crosstalk between communication lines in the communication system, and a plurality of communication systems that perform time-division data communication between the parent device and the child device as communication units via the communication line In a time division data communication apparatus used as the master in a time division data communication system that needs to prevent crosstalk between communication lines of the communication system, it is possible to prevent crosstalk between communication lines accurately. It is intended.

  A time division data communication system according to the present invention has a plurality of communication systems for performing time division data communication using a frame as a communication unit between a master unit and a slave unit via a communication line, and between the communication lines of the communication system In the time-sharing data communication system that requires the prevention of crosstalk, in each communication system, the frame is composed of a first frame having a predetermined length and a second frame having a frame length shorter than the frame length of the first frame. And a second frame is generated in the first frame, the transmission timing of the first frame of each communication system is synchronized by a synchronization means, and each of the synchronized communication systems The second frame corresponding to the first frame is generated exclusively so that the respective time zones do not overlap, and the second frame of the communication systems generated exclusively of the mutual is generated. The one in which the data communication of the corresponding communication system are carried out.

  The time division data communication apparatus according to the present invention has a plurality of communication systems for performing time division data communication using a frame as a communication unit between a master unit and a slave unit via a communication line between the communication lines of the communication system. A time division data communication apparatus used as the base unit in a time division data communication system requiring crosstalk prevention, wherein the time division data communication apparatus includes a first frame having a predetermined length and a frame of the first frame. The frame is composed of a second frame having a frame length shorter than the length, a second frame is generated in the first frame, and the transmission timing of the first frame in each communication system is synchronized. And the second frame corresponding to the first frame of each of the synchronized communication systems is mutually exclusive so as not to overlap each time zone. Is generated by the data communication apparatus, wherein the mutual to the second frame of exclusively generated the respective communication system, in which said corresponding communication system the data communication is performed in the time division data communication apparatus.

  The present invention has a plurality of communication systems that perform time-division data communication using a frame as a communication unit between a master unit and a slave unit via a communication line, and it is necessary to prevent crosstalk between the communication lines of the communication system. In the divided data communication system, each communication system includes the first frame having a predetermined length and a second frame having a frame length shorter than the frame length of the first frame, and the first frame. A second frame is generated, the transmission timing of the first frame of each communication system is synchronized by a synchronization means, and each of the synchronized first frames of each communication system is The corresponding second frame is generated exclusively so that the respective time zones do not overlap each other, and the second frame of each of the communication systems generated exclusively of the mutual is used to generate the corresponding communication system. Since over data communication is performed, crosstalk prevention between communication lines of a plurality of communication systems, by the synchronization and the second frame, the effect of making it possible to be performed accurately.

  In addition, the present invention has a plurality of communication systems that perform time-division data communication using a frame as a communication unit between a parent device and a child device via a communication line, and it is necessary to prevent crosstalk between the communication lines of the communication system. A time division data communication apparatus used as the master in a time division data communication system, wherein the first frame having a predetermined length and a frame length shorter than the frame length of the first frame are used in the time division data communication apparatus. And the second frame is generated and the second frame is generated in the first frame, and the transmission timing of the first frame of each communication system is synchronized by the synchronization means, The time division data communication device generates the second frame corresponding to the first frame of each synchronized communication system mutually and exclusively so that the respective time zones do not overlap each other. Since the data communication of the corresponding communication system is performed in the time division data communication device by the second frames of the communication systems generated exclusively from each other, between the communication lines of a plurality of communication systems The crosstalk prevention can be performed accurately by the time division data communication apparatus itself by the synchronization and the second frame.

It is a figure which shows Embodiment 1 of this invention, and is a block diagram which shows an example of a structure of a time division data communication system and a time division data communication apparatus. FIG. 5 is a diagram illustrating the first embodiment of the present invention, and is a block diagram illustrating an example of a concept of communication timing adjustment for synchronizing the transmission timing of the first frame of each communication system. FIG. 3 is a diagram illustrating the first embodiment of the present invention, and is a block diagram illustrating an example relating to communication timing adjustment for synchronizing the transmission timing of the first frame of each communication system in the parent device (time division data communication device). . 1 is a diagram showing a first embodiment of the present invention, in which the concept of transmission timing synchronization of a first frame (super frame) of a master unit of each communication system in FIGS. FIG. 5 is an explanatory diagram for explaining timing information (superframe start timing (transmission timing) information). In the diagram showing the first embodiment of the present invention, the first frame of each communication system of the base unit A, base unit B, and base unit C is set to a predetermined length (for example, a fixed length) of the same length, and the second frame is It is each frame correlation diagram which shows the example made into variable length. In the figure which shows Embodiment 2 of this invention, the 2nd frame of the variable length of each communication system is contained in the 1st frame of the same time zone of each communication system of the main unit A, the main unit B, and the main unit C. It is each frame correlation diagram which shows the example produced | generated so that it may not overlap in time. It is a figure which shows Embodiment 1 of this invention, and is explanatory drawing of the response time corresponding to FIG. 5 in the case of transmitting response data with respect to transmission data. It is a figure which shows Embodiment 2 of this invention, and is explanatory drawing of the response time corresponding to FIG. 6 in the case of transmitting response data with respect to transmission data. In the figure which shows Embodiment 2 of this invention, the 2nd frame of the variable length of each communication system is contained in the 1st frame of the same time zone of each communication system of the main unit A, the main unit B, and the main unit C. It is a figure which shows the example of the distribution rule of the communication right of each communication type used when producing | generating so that it may not overlap in time as an example of a distribution pattern. It is a conceptual diagram which shows the conventional time division data communication system. It is a figure for demonstrating the problem which invention tends to solve, and is a figure explaining the relationship between the time division data communication of the frame unit by the side of the main | base station A, the time division data communication by the side of the main | base station B, and crosstalk.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to FIGS.
FIG. 1 is a block diagram showing an example of the configuration of a time division data communication system and a time division data communication device. In FIG. 1, illustration of the slave unit (time division data communication device) in FIG. An example of a time division data communication apparatus functioning as a machine and an example of a time division data communication system using the time division data communication apparatus are shown.

  FIG. 1 shows a parent device A in a communication system of a parent device A that performs time-sharing data communication with a corresponding child device (not shown) via the communication line 1 and a corresponding child device (via the communication line 2). A case in which the time-sharing data communication device 3 having the same configuration and the same function is used for both of the parent devices B in the communication system of the parent device B that performs time-division data communication is shown.

  As illustrated in FIG. 1, the time division data communication device 3 includes the transmission / reception unit 31, the communication timing generation unit 32, the communication timing adjustment unit 33, the transmission / reception timing generation unit 34, and the communication in both the parent devices A and B. The order adjusting unit 35 is configured. In addition to the time division data communication device 3, a communication timing synchronization information generation unit 4 that is used in common with the parent devices (time division data communication device 3) A and B is provided.

The transmission / reception unit 31 is a functional unit that realizes an operation for realizing a modem function (time division data communication function). In both of the parent devices A and B, an operation necessary for transmission (for example, transmission signal generation, transmission) Data holding, transmission data processing, transmission signal modulation, generation and assembly of each frame of the superframe that is the first frame for transmission and the subframe that is the second frame for transmission, etc.) and reception This is a functional unit that performs operations necessary for the reception (for example, demodulation of received signals, decomposition of frames, extraction of modem control information and received data, etc.).
Note that the superframe that is the first frame is a frame that is conventionally simply referred to as a frame, but in the present embodiment, in order to distinguish it from the subframe that is the second frame, A superframe that is one frame is in principle referred to as a “superframe”, and is referred to as a “superframe (first frame)” or “first frame (superframe)” as necessary. The sub-frame which is the second frame is in principle referred to as “sub-frame”, and is described as “sub-frame (second frame)” or “second frame (sub-frame)” as necessary. In the drawing, “superframe” and “subframe” are described. )

  The communication timing generation unit 32, in any of the parent devices A and B, timing related to a superframe and a subframe for transmission / reception between the parent device and the child device (for example, a superframe and subframe start timing ( (Transmission timing), superframe and subframe frame length, etc.).

  The communication timing adjustment unit 33 is the superframe rising timing in the host device (self-time division data communication device) according to the adjustment information from the communication timing synchronization information generation unit 4 in both the parent devices A and B. This is a functional unit that adjusts the start timing (transmission timing) so that it matches the reference communication timing (timing that becomes the reference for the start timing of the superframe) common to each parent device (time division data communication device 3).

The transmission / reception timing generation unit 34 generates transmission / reception timing of transmission / reception data, which data is transmitted / received at what time (what time) in the corresponding parent unit (time division data communication device 3) in either of the parent units A and B It is a functional part to do.
In any of the parent devices A and B, the transmission / reception unit 31 that has obtained the transmission / reception timing information generated by the transmission / reception timing generation unit 34 is necessary for the operation and reception necessary for the transmission according to the transmission / reception timing information. Perform the correct operation.

  In any of the parent devices A and B, the communication order adjusting unit 35 transmits the communication amount of one superframe of another parent device (communication amount of one or more subframes in the superframe) and one superframe of the own parent device. Compare the frame traffic (traffic volume of one or more subframes in the superframe), and follow the rules (examples will be described later with reference to FIG. 9) determined in advance for each parent device in accordance with the following or The communication order of the subframes in the subsequent superframe is adjusted and determined, and the transmission / reception unit 31 performs communication (transmission and reception) via the transmission / reception timing generation unit 34 according to this determination.

The communication timing synchronization information generation unit 4 includes information related to communication of each parent device (each of the parent device A and the parent device B), in particular, a timing related to a super frame (for example, a super frame start timing (transmission timing), The frame length of the superframe, etc.) is input, and the start timing (transmission timing) of the superframe of each parent device (each of the parent device A and each of the parent device B) is matched with the reference communication timing common to each parent device. Adjustment information (for example, the number of clocks corresponding to a temporal difference between the reference communication timing and the superframe start timing (transmission timing) of each parent device (each of the parent device A and the parent device B)). Notify the master unit. That is, the communication timing synchronization information generation unit 4 sends the adjustment information of the temporal difference between the reference communication timing and the superframe start timing (transmission timing) of the parent device A to the communication timing adjustment unit 33 of the parent device A. The adjustment information of the temporal difference between the reference communication timing and the superframe start timing (transmission timing) of the base unit B is notified to the communication timing adjustment unit 33 of the base unit B, respectively.
The communication timing adjustment units 33 of the parent devices A, B,... In the own parent device (self-time division data communication device) according to the adjustment information (δ described later) from the communication timing synchronization information generation unit 4. The start timing (transmission timing), which is the rise timing of the superframe, is matched with the reference communication timing (timing that is the reference for the start timing of the superframe) common to each master unit (time division data communication device 3), that is, Adjust so that there is no time difference from the reference communication timing.
The reference communication timing may be generated by the communication timing synchronization information generation unit 4, and the communication timing (transmission timing) of any of the parent devices A, B,. ) May be used as the reference communication timing.

Next, the concept of communication timing adjustment for synchronizing the transmission timing of the first frame of each communication system of the parent device A, the parent device B,... Will be described with reference to FIG.
The communication timing synchronization information generating unit 4 includes, for example, a communication timing adjusting unit as illustrated in FIG. 2, and actual communication timing information (of the superframe) is transmitted from each of the parent device A, the parent device B,. Start timing (transmission timing)) α through the communication timing adjustment information transmission path (for example, LAN, serial, dedicated signal line, etc.) actual communication timing information from each of the parent devices A, B,. Comparison between α (or γ) and reference communication timing information β from the superframe reference communication timing information β generation unit, input to the difference extraction unit that extracts the communication timing difference δ between the two, and the difference extraction unit extracts The difference information (for example, the reference communication timing and the superframe start timing (transmission timing) of each parent device (each of parent device A and parent device B)) for each of the parent device A, parent device B,. The number of clocks of the time difference equivalent to the grayed), and the like)) δ (
δ = α (or γ) −β) is notified to the corresponding base unit via the communication timing adjustment information transmission path. By continuing the above operation every superframe or at a necessary cycle (repeatedly and continuously), the communication timing (start timing (transmission timing) of the superframe) of the parent device A, the parent device B,. Synchronization can be maintained.

  Based on the adjustment information δ (= α (or γ) −β) that is the difference information, as described above, the communication timing adjustment units 33 of the parent devices A, B,. In accordance with the adjustment information δ from the information generator 4, the start timing (transmission timing), which is the rising timing of the superframe in the own base unit (self-time division data communication device), is sent to each base unit (time division data communication device 3). Adjustments are made so as to match the common reference communication timing (the timing that serves as a reference for the start timing of the superframe), that is, to eliminate the time difference from the reference communication timing.

Next, communication timing adjustment for synchronizing the transmission timing of the first frame of each communication system in each parent device (time division data communication device) will be described with reference to FIG.
In each of the parent devices A, B,..., The superframe start timing (transmission timing) α generated by each communication timing generation unit 32 is the difference sent from the communication timing synchronization information generation unit 4. Based on the information δ (= α−β), as described above, each communication timing adjustment unit 33 of the parent device A, B,... Performs the superframe of the parent device (self-time division data communication device). The start timing (transmission timing) that is the rising timing is matched with the reference communication timing (timing that becomes the reference for the start timing of the superframe) common to each parent device (time division data communication device 3), that is, the reference communication timing. And adjust the super frame start timing (transmission timing) γ as a result of transmission and reception as described above. The data is sent to the transmission / reception unit 31 via the timing generation unit 34 and to the communication timing adjustment unit of the communication timing synchronization information generation unit 4.

  In each of the parent devices A, B,..., The crystal oscillator that is the basis of the communication timing generated by the parent device generally has individual differences. Therefore, the communication timing adjustment is performed by the first adjustment. Even if it can be included, it will shift over time, so it is preferable to perform continuous adjustment. Therefore, the output of the communication timing generation unit and the reference communication timing are continuously compared in every superframe, and the difference δ is continuously fed back to the communication timing adjustment unit 33 of each parent device A, B,. Thus, the communication timing synchronization state can be reliably maintained.

  As described above, in each of the parent devices A, B,..., The adjustment is performed by each communication timing adjustment unit 33 based on the difference information δ notified from the communication timing synchronization information generation unit 4. The superframe start timing (transmission timing) can be adjusted to the reference communication timing, and the superframe communication timing (transmission timing) of each parent device can be adjusted by performing the adjustment every superframe or periodically. It can always be accurately synchronized.

Next, referring to FIG. 4, the concept of synchronization of the transmission timing of the first frame (superframe) of the master unit of each communication system in FIGS. 1 to 3 is represented by reference communication timing information and actual communication timing information (superframe). (Start timing (transmission timing) information) will be described.
In the example of FIG. 4, the difference information δ with respect to the base unit A communication timing information α, which is the superframe start timing (transmission timing) information of the base unit A, with respect to the base communication timing information β is the communication of the base unit A. The timing difference information δA, and the base unit A communication timing information α is advanced in phase with the reference communication timing information β. Accordingly, the communication timing difference information δ from the communication timing adjustment means in FIGS. 2 and 3 is −δA for the communication timing adjustment unit 33 of the parent device A, and based on this −δA, the superordinate of the parent device A is obtained. As described above, the frame start timing (transmission timing) is adjusted by the communication timing adjustment unit 33 of the base unit A in the direction of delaying the communication timing (start timing (rise timing)) of the reference communication timing information β. Adapted. That is, the superframe start timing (transmission timing) of base unit A is synchronized with the communication timing of reference communication timing information β.

  Similarly, the difference information δ from the base unit B communication timing information α, which is information on the start timing (transmission timing) of the superframe of the base unit B, with respect to the reference communication timing information β is the communication timing difference information of the base unit A Furthermore, the base unit A communication timing information α is delayed in phase from the reference communication timing information β. Therefore, the communication timing difference information δ from the communication timing adjustment means in FIGS. 2 and 3 is + δB for the communication timing adjustment unit 33 of the base unit B, and based on this + δB, the superframe of the base unit B The start timing (transmission timing) is adjusted by the communication timing adjustment unit 33 of the base unit B in the advancing direction so as to match the communication timing (start timing (rise timing)) of the reference communication timing information β as described above. . That is, the superframe start timing (transmission timing) of base unit B is synchronized with the communication timing of reference communication timing information β.

  As described above, the superframe start timing (transmission timing) of base unit A is synchronized with the communication timing of reference communication timing information β, and the superframe start timing (transmission timing) of base unit B Is synchronized with the communication timing of the reference communication timing information β, so that the superframe start timing (transmission timing) of the base unit A and the superframe start timing (transmission timing) of the base unit B are synchronized. Is planned.

  As can be seen from the above description, the communication timing synchronization information generation unit 4, the communication timing generation unit 32, and the communication timing adjustment unit 33 are mainly synchronization means. Also, in any of the master units A, B,..., The transmission / reception timing generation unit 34 and the transmission / reception unit 31 are also involved in the execution of the above-described synchronization. The unit 31 can also be said to be a synchronization means.

As a result of the configuration, function, and operation as described above, as a result, as shown in FIG. 5, for example, the superframe (first frame) of each communication system of the base unit A, base unit B, base unit C,. ) Is a predetermined length (for example, a fixed length) of the same length, and the communication data A, B, C,... Of each communication system is transmitted in the data communication in which the subframe (second frame) is variable length. Superframes (first frames) of communication systems can be communicated so that variable-length subframes (second frames) do not overlap in time, and crosstalk between the communication systems can be accurately prevented.
In the example of FIG. 5, as shown in the figure, in any of the superframes of the communication systems of the parent device A, the parent device B, the parent device C,... Depending on the amount of data, there is a possibility that “free time” in which no data communication is performed occurs in any of the communication systems of the parent device A, the parent device B, the parent device C,. It is more preferable if it can be devised so that the effective communication speed does not decrease.
For example, as illustrated in FIG. 7, in the case of a communication system in which there is response data A from the slave unit with respect to transmission data A from the master unit, in the case of FIG. The response time requires approximately 3 superframes, and it is more preferable if it can be devised to shorten the response time.

Embodiment 2. FIG.
Hereinafter, the second embodiment will be described with reference to FIG. 6, FIG. 8, and FIG. The second embodiment is an example in which the throughput (effective communication speed) is not lowered and the response time is shortened. Note that a block diagram illustrating an example of the configuration of the time division data communication system and the time division data communication apparatus according to the second embodiment is the same as FIG. 1, and will be described with reference to FIG.

  FIG. 6 shows communication data A, B, C of each communication system in a super frame (first frame) of the same communication system of each of the communication systems of base unit A, base unit B, base unit C,. ,... Are arranged in the same time zone of each communication system of the parent device A, the parent device B, the parent device C,... In the superframe (first frame), data communication is performed using a variable length subframe (second frame) in each of the communication systems of the parent device A, the parent device B, the parent device C,. Moreover, this is an example of realizing communication in which variable length subframes (second frames) of the communication systems of the parent device A, the parent device B, the parent device C,. That is, in the superframe (first frame) in the same time zone of each communication system of the parent device A, the parent device B, the parent device C,..., The parent device A, the parent device B, the parent device C,.・ Each communication system performs data communication using a variable-length subframe (second frame), and data communication can be performed in any of the communication systems of the above-described base unit A, base unit B, base unit C,. By suppressing the occurrence of “free time” that is not performed, it is possible to realize data communication that can increase the throughput and can also accurately prevent crosstalk of each communication system.

Further, for example, in the case of a communication system in which there is response data A from the slave unit with respect to transmission data A from the base unit, the response time of the response data A to the transmission data A is almost the same in the cases of FIGS. In contrast to the case where 3 superframes are required, in the case of FIG. 6, as illustrated in FIG. 8, the response time is such that the response time is less than 1 superframe length, and the response time can be significantly shortened. .

FIG. 9 shows an example of means for realizing the case of FIGS. 6 and 8 described above.
A variable-length subframe (second frame) of each communication system is temporally overlapped in a superframe (first frame) of the same time zone of each communication system of base unit A, base unit B, and base unit C. It is a figure which shows the example of the distribution rule of the communication right of each communication type used when producing | generating so that it may not become as an example of a distribution pattern.

  The communication volume of the parent device A, the parent device B, and the parent device C depends on the necessary communication amount of each parent device, the communication time, the necessity of considering the presence or absence of priority data, etc. As illustrated in FIG. 9, the parent device A (indicated as “parent A” in FIG. 9), the parent device B (indicated as “parent B” in FIG. 9), and the parent device C (in FIG. 9, “parent A”). When the maximum communication amount in the superframe of “parent C” is set to 6, each communication system is included in the superframe (first frame) of the same time zone of each communication system of parent A, parent B, and parent C. The communication right allocation rule for generating one or more variable-length subframes (second frames) so as not to overlap with each other in the case of the traffic volume ratio as an example is distribution pattern 1 (parent A “6”). ", Parent B" 0 ", parent C" 0 "), distribution pattern 2 (parent A" 5 ", parent B" 1 ", parent C" 0 "), ... distribution pattern 8 (parent “2”, parent B “2”, parent C “2”),... Distribution pattern n (parent A “0”, parent B “6”, parent C “0”) (not shown),. There are distribution patterns x (parent A “0”, parent B “0”, parent C “6”) (not shown),.

Therefore, the communication order adjustment unit 35 in FIG. 1 is a superframe of another parent device that relatively needs to prevent crosstalk in any of the parent devices A, B, C, etc. of the communication system that needs to prevent crosstalk. 9 is compared with the communication amount of the superframe of the own base unit, and it is determined which pattern of the communication right allocation rule of FIG. Depending on the allocation, the communication order of one or more subframes in the superframe corresponding to each parent device in the same time zone following or after the parent devices A, B, C, for example, of the communication system that needs to prevent crosstalk is determined. The transmission / reception unit 31 assembles one or more subframes and performs communication (transmission and reception) via the transmission / reception timing generation unit 34 according to this determination.
6 and 8 correspond to the pattern 7 in FIG. 9 in the superframe corresponding to each parent device in the same time zone of the parent devices A, B, and C of the communication system that need to prevent crosstalk. This is an example in which the transmission / reception unit 31 assembles the subframe via the transmission / reception timing generation unit 34 in accordance with the determination of the communication order and adjustment of the subframe. If the determination conflicts between the parent devices, communication is performed in a fixed order set initially.

  In addition to the communication right distribution pattern illustrated in FIG. 9, the communication right distribution rule can prevent crosstalk relatively, for example, in any of the communication systems that need to prevent crosstalk, such as the base units A, B, and C. Subframes corresponding to each parent device in the superframe corresponding to each parent device in the same time zone do not overlap by calculating from the superframe traffic amount of the other parent device required and the superframe communication amount of the own parent device In addition, each subframe in the superframe corresponding to each parent device in the same time zone is suppressed so that the idle time in which no subframe of any parent device exists in the superframe corresponding to each parent device in the same time zone is suppressed. , And the transmission / reception timing generation unit 34 of the base units A, B, C,... Of the communication system that needs to prevent crosstalk, as described above, based on the derived result. Via send and receive 31 is also possible to execute the assembly communication (sending and receiving) one or more sub-frames, it is possible to obtain the same effect as the case of applying the exemplary communication right allocation patterns in Figure 9 above.

  The first and second embodiments of the present invention are also a time division data communication system and a time division data communication apparatus between a parent device and a child device having the following more specific characteristics.

Each master unit is connected to two or more pairs of twisted pairs that are close to each other, and data communication is performed between the master unit and the slave unit via the same twisted pair wires. In the configuration where
(1) One or more slave units can be connected on the same twisted pair,
(2) Control the communication amount / allowance of the master unit itself and one or more slave units connected to itself, and the slave unit communicates according to the control of the master unit,
(3) A fixed-length superframe is used as a communication unit between the master unit and the slave unit, and communication data between the master unit and one or more slave units is assigned to itself and one or more slave units by the master unit. Data communication is performed in variable-length subframes according to the amount of transmission data within a range not exceeding the superframe, and a plurality of subframes can be arranged in one superframe within a range not exceeding the superframe length (see FIG. 6). ,
(4) The master unit has a function of “synchronizing” with the master unit itself or with the support of an external function and “synchronized” with another master unit connected to the same end of the twisted pair. By synchronizing with the machine, it can operate in the range of the previous period,
(5) The master unit synchronizes all the master units connected to the twisted pair wires that may need countermeasures against crosstalk, and simultaneously operates each super frame. According to the communication amount of each master unit, At the same time, it has a function ("exclusive data communication") that allows data communication between a master unit connected to a pair of twisted wires and one or more slave units.
(6) The master unit has a function of “selecting a master unit for exclusive data communication” by setting the modem (time division data communication device) or the like (communication quality is improved due to mutual interference among the synchronized master units. Only the master unit that can be reduced can communicate exclusive data, and nothing else can avoid unnecessary performance degradation of the master unit that does not interfere).
In other words, when each parent device is connected to two or more adjacent communication lines, the communication timing of each parent device is synchronized by the method described in the first and second embodiments, and the interference amount is measured or the modem device is used. Based on analogy based on the state of wiring and wiring, etc., only a parent device that has a large interference due to crosstalk and is concerned that communication interruption, effective speed (throughput) reduction or communication error may occur is selected. 2 can perform exclusive communication based on the communication order adjustment described in 2 above, thereby avoiding interference, and by not selecting and setting a parent device that is not concerned about interference, unnecessary effective speed due to exclusive communication Decline can be prevented. Further, when the number of interfering master units increases due to the addition of a modem device (time division data communication device) or the change of the wiring of the communication line, the relevant master unit is selected by the above method, and the master unit is By applying the settings, it is possible to easily take necessary countermeasures against the parent device.

(7) As a specific method of (4),
(4-1) Collect superframe timing information (for example, start position) from the target parent device,
(4-2) Detect the difference in the superframe timing of each base unit with respect to the reference timing,
(4-3) Using synchronization means for notifying each master unit of the difference (for example, as the number of clocks and advance / delay)
(4-4) Each master unit corrects its superframe timing so that the difference is zero or close to zero.
(4-5) In order to cancel the frequency deviation between the timing reference clocks in each parent device, the above (4-4) is continued,
Keep the difference zero or close to zero.

(8) As a specific method of (5),
(5-1) Each parent device notifies each other of information related to communication (for example, the amount of data and presence / absence of priority communication data) before the start of communication. Each master unit determines the communication start time, communication time, communication amount, etc. in one superframe according to a predetermined “rule” based on the received information, and performs communication so that communication times do not overlap.
(5-2) An example of the rule in the case of three parents A, B, and C is shown in FIG. The rules may be changed according to the application.
Example:
The following distribution pattern is defined for the allocation of data communication time within one superframe (fixed length) to one or more subframes (variable length). The distribution pattern defines a pattern in which only one master unit (and a slave unit connected to it) can communicate in one or more subframes at the same time. Each parent device compares the communication request amount between itself and the other parent device, and selects an allocation pattern number having the closest ratio. The amount that does not fit in one superframe is selected again in the next superframe, and the distribution pattern is selected according to the above rule, and communication is performed in one or more subframes (see FIGS. 5, 6, 7, and 8).

  The first embodiment of the present invention is also a time division data communication system and a time division data communication apparatus having the following more conceptual features.

(Conceptual feature 1) Cross communication between communication lines of the communication system having a plurality of communication systems that perform time-division data communication between a parent device and a child device via communication lines 1 and 2 using a frame as a communication unit. In time-sharing data communication systems that need to be prevented,
In each communication system, the frame is composed of a first frame having a predetermined length and a second frame having a frame length shorter than the frame length of the first frame, and one or more frames are included in the first frame. A second frame is generated,
The transmission timing of the first frame of each communication system is synchronized by the synchronization means 4 and 33,
The second frame corresponding to the first frame of each of the synchronized communication systems is generated exclusively so that the respective time zones do not overlap,
Data communication of the corresponding communication system is performed by one or more second frames of the communication systems generated exclusively of each other.

(Conceptual feature 2) A plurality of communication systems that perform time-division data communication using a frame as a communication unit between a parent device and a child device via communication lines 1 and 2, and crosstalk between communication lines of the communication system In time-sharing data communication systems that need to be prevented,
In each communication system, the frame is composed of a first frame having a predetermined length and a second frame having a frame length shorter than the frame length of the first frame, and one or more frames are included in the first frame. A second frame is generated,
The transmission timing of the first frame of each communication system is synchronized by the synchronization means 4 and 33,
One or more second frames corresponding to the first frames in the same time zone of each synchronized communication system are generated exclusively so that the time zones do not overlap each other,
Data communication of the corresponding communication system is performed by one or more second frames of the communication systems generated exclusively in the first frame in the same time zone.

(Conceptual feature 3) Cross communication between communication lines of the communication system, having a plurality of communication systems that perform time-division data communication between the parent device and the child device via the communication lines 1 and 2 as a communication unit. In time-sharing data communication systems that need to be prevented,
Each of the base units of each communication system includes the first frame having a first frame having a predetermined length and a second frame having a frame length shorter than the frame length of the first frame. One or more second frames are generated within,
The transmission timing of the first frame of each communication system is synchronized by the synchronization means 4 and 33,
Each of the communication is mutually exclusive so that the corresponding one or more second frames do not overlap with each of the first frames in the same time zone of each synchronized communication system. Generated in each of the parent units of the system,
Data communication of the corresponding communication system is performed by one or more second frames of the communication systems generated exclusively in the first frame in the same time zone.

(Conceptual feature 4) In the time division data communication system according to any one of the conceptual features 1 to 3, the frame length of the second frame is variable.
(Conceptual feature 5) In the time division data communication system of the conceptual feature 2 or 3, the frame length of the second frame is variable, and in the first frame in the same time zone of each communication system, When the communication traffic of other communication systems other than the communication system is zero, the one or more second frames are used over the entire frame length of the second frame of the one communication system. Communication communication is performed.
(Conceptual feature 6) In the time division data communication system according to any one of the conceptual features 2 to 5, the second frame is generated in an arbitrary time zone in the first frame.
(Conceptual feature 7) In the time division data communication system according to any one of conceptual features 2 to 6, each of the one or more second frames in the first frame in the same time zone of each communication system The communication amount is communicated between the communication systems, and the frame length corresponding to the communication amount or the total amount of each of the second frames in the first frame in the same time zone of the communication systems. One or more second frames are generated in the first frame in the same time zone of each corresponding communication system.
(Conceptual feature 8) In the time division data communication system of the conceptual feature 7, according to a ratio of the communication amount of each of the second frames in the first frame in the same time zone of each communication system in advance. According to a predetermined communication right allocation rule, the one or more first frames having a frame length corresponding to the communication amount of each of the second frames in the first frame in the same time zone of the communication systems. Two frames are generated in the first frame in the same time zone of each corresponding communication system.

(Conceptual feature 9) Crosstalk prevention between communication lines of the communication system having a plurality of communication systems for performing time-division data communication between the master unit and the slave units via the communication lines 1 and 2 as a communication unit. Is a time division data communication device 3 used as the master in a time division data communication system that requires
In the time division data communication apparatus 3, the frame is composed of a first frame having a predetermined length and a second frame having a frame length shorter than the frame length of the first frame, and 1 in the first frame. Two or more second frames are generated,
The transmission timing of the first frame of each communication system is synchronized by the synchronization means 4 and 33,
The time division data communication device 3 is mutually exclusive so that one or more second frames corresponding to the first frames of the synchronized communication systems do not overlap each time zone. Generated by
The data communication of the corresponding communication system is performed in the time division data communication device 3 by the one or more second frames of the communication systems generated exclusively from each other.

(Conceptual feature 10) Having a plurality of communication systems for performing time-division data communication between the parent device and the child device via communication lines 1 and 2 as a communication unit, preventing crosstalk between the communication lines of the communication system Is a time division data communication device 3 used as the master in a time division data communication system that requires
In the time division data communication apparatus 3, the frame is composed of a first frame having a predetermined length and a second frame having a frame length shorter than the frame length of the first frame, and 1 in the first frame. Two or more second frames are generated,
The transmission timing of the first frame of each communication system is synchronized by the synchronization means 4 and 33,
The time divisions are mutually exclusive so that one or more second frames corresponding to the first frames in the same time zone of the synchronized communication systems do not overlap each time zone. Generated by the data communication device 3,
One or more second frames of the respective communication systems generated exclusively in the first frame in the same time zone cause the corresponding data communication of the communication system to be the time division data communication. Performed in apparatus 3.

(Conceptual feature 11) In the time division data communication apparatus of the conceptual feature 9 or 10, the frame length of the second frame is variable.
(Conceptual feature 12) In the time division data communication apparatus of the conceptual feature 10, the frame length of the second frame is variable, and one communication is performed in the first frame in the same time zone of each communication system. When the communication amount of other communication systems other than the system is zero, the one communication is performed using one or more second frames over the entire frame length of the first frame of the one communication system. System communication is performed by the time division data communication apparatus.
(Conceptual feature 13) In the time division data communication apparatus according to any one of the conceptual features 10 to 12, one or more of the second frames are generated in an arbitrary time zone in the first frame.
(Conceptual feature 14) In the time division data communication apparatus according to any one of conceptual features 10 to 13, each of the one or more second frames in the first frame in the same time zone of each communication system Communication amount or the total amount thereof is communicated between the communication systems, and depends on the communication volume of each of the one or more second frames in the first frame in the same time zone of the communication systems. The one or more second frames having the same frame length are generated by the time division data communication apparatus in the first frame in the same time zone of the corresponding communication systems.
(Conceptual feature 15) In the time division data communication apparatus of the conceptual feature 14, the communication amount of each of the one or more second frames in the first frame in the same time zone of each communication system or the Depending on the total amount, a frame length corresponding to the communication amount of each of the one or more second frames in the first frame in the same time zone of each communication system based on a communication right allocation rule. One or more second frames are generated by the time division data communication apparatus in the first frames in the same time zone of the corresponding communication systems.
(Conceptual feature 16) In the time division data communication apparatus of the conceptual feature 14, the communication amount of each of the one or more second frames in the first frame in the same time zone of the communication systems or the The communication amount of each of the one or more second frames in the first frame in the same time zone of each communication system according to a communication right allocation rule determined in advance according to the ratio of the total amount The one or more second frames having a frame length corresponding to the first frame are generated by the time division data communication device in the corresponding first frame in the same time zone of each communication system.
(Conceptual feature 17) In the time division data communication apparatus according to the conceptual feature 9, the second frame corresponding to the first frame of each of the synchronized communication systems has a respective time zone. The time-sharing data communication devices are generated exclusively by the time division data communication device so as not to overlap each other, and the second frame of each communication system generated exclusively by the mutual communication causes the corresponding data communication of the communication system to be performed at the time. In the time division data communication apparatus of the communication system that can select and set the function performed in the divided data communication apparatus and does not need to prevent crosstalk between the communication lines, the first of each of the synchronized communication systems The corresponding second frame is generated by the time division data communication device mutually exclusive so that the respective time zones do not overlap each other, and each of the frames generated exclusively by each other By the second frame of the signal based, a division data communication apparatus when said that it will not be selected set of functions corresponding the communication system the data communication is performed in the time division data communication apparatus.
(Conceptual feature 18) In the time division data communication apparatus according to the conceptual feature 10, the second frame corresponding to each of the first frames in the same time zone of the synchronized communication systems is respectively The time-sharing data communication devices are mutually exclusive so as not to overlap with each other, and the communication systems of the communication systems generated exclusively in the first frame in the same time zone The second frame allows the selection and setting of the function in which the data communication of the corresponding communication system is performed in the time division data communication apparatus, and the communication system time division data communication apparatus does not require the prevention of crosstalk between the communication lines. Then, the synchronized second communication frames are mutually exclusive so that the second frames corresponding to the first frames in the same time zone of the synchronized communication systems do not overlap each time zone. The data communication of the corresponding communication system is generated by the second frame of each communication system generated by the split data communication device and generated exclusively in the first frame of the same time period. A time division data communication apparatus characterized in that the function setting performed in the time division data communication apparatus is not set.

In the present invention, the embodiments can be modified as appropriate within the scope of the invention.
In the drawings, the same reference numerals indicate the same or corresponding parts.

1 communication line,
2 communication lines,
3 Time-sharing data communication device,
31 Transmitter / receiver,
32 communication timing generator,
33 Communication timing adjustment unit (synchronization means)
34 Transmission / reception timing generation unit,
35 communication order adjustment unit,
4 Communication timing synchronization information generator (synchronization means).

Claims (18)

A time division data communication system having a plurality of communication systems for performing time division data communication between a parent device and a child device as communication units via a communication line, and which needs to prevent crosstalk between the communication lines of the communication system In
In each of the communication systems, the frame is composed of a first frame having a predetermined length and a second frame having a frame length shorter than the frame length of the first frame, and a second frame is included in the first frame. Is generated,
The transmission timing of the first frame of each communication system is synchronized by synchronization means,
The second frame corresponding to the first frame of each of the synchronized communication systems is generated exclusively so that the respective time zones do not overlap,
The data communication of the corresponding communication system is performed by the second frame of each of the communication systems generated exclusively of the mutual communication system. A time division data communication system having a plurality of communication systems for performing time division data communication between a parent device and a child device as communication units via a communication line, and which needs to prevent crosstalk between the communication lines of the communication system In
In each of the communication systems, the frame is composed of a first frame having a predetermined length and a second frame having a frame length shorter than the frame length of the first frame, and a second frame is included in the first frame. Is generated,
The transmission timing of the first frame of each communication system is synchronized by synchronization means,
The second frame corresponding to the first frame of each of the synchronized communication systems in the same time zone is generated mutually exclusive so that the respective time zones do not overlap,
Data communication of the corresponding communication system is performed by the second frame of each of the communication systems generated exclusively in the first frame in the same time zone. Data communication system. A time division data communication system having a plurality of communication systems for performing time division data communication between a parent device and a child device as communication units via a communication line, and which needs to prevent crosstalk between the communication lines of the communication system In
Each of the base units of each communication system includes the first frame having a first frame having a predetermined length and a second frame having a frame length shorter than the frame length of the first frame. A second frame is generated in
The transmission timing of the first frame of each communication system is synchronized by synchronization means,
The parent of each communication system is mutually exclusive so that the corresponding second frame does not overlap the respective first time frame in the same time zone of each synchronized communication system. Generated in each of the machines,
Data communication of the corresponding communication system is performed by the second frame of each of the communication systems generated exclusively in the first frame in the same time zone. Data communication system. In time division data communication system according to claim 1 to any one of claims 3,
A time division data communication system, wherein a frame length of the second frame is variable. In the time division data communication system according to claim 2 or 3,
The frame length of the second frame is variable;
In the first frame in the same time zone of each communication system, when the communication amount of the other communication system other than the one communication system is zero, the total frame length of the second frame of the one communication system A time division data communication system, wherein communication of the one communication system is performed using one or more of the second frames. In the time division data communication system according to any one of claims 2 to 5,
2. The time division data communication system according to claim 1, wherein the second frame is generated in an arbitrary time zone in the first frame. In the time division data communication system according to any one of claims 2 to 6,
The communication amount of each of the second frames in the first frame in the same time zone of each communication system is communicated between the communication systems,
The second frame having a frame length corresponding to the communication amount of each of the second frames in the first frame in the same time zone of each communication system is the same time zone of the corresponding communication system. A time division data communication system generated in the first frame. The time division data communication system according to claim 7,
Same for each communication system according to a communication right allocation rule predetermined according to a ratio of the communication amount of each of the second frames in the first frame in the same time zone of each communication system The second frame having a frame length corresponding to the communication amount of each of the second frames in the first frame in the time zone is the first frame in the same time zone of the corresponding communication system. A time division data communication system characterized by being generated. In a time division data communication system having a plurality of communication systems that perform time division data communication using a frame as a communication unit between a master unit and a slave unit via a communication line and that needs to prevent crosstalk between the communication lines of the communication system A time division data communication device used as the base unit,
In the time division data communication apparatus, the frame is composed of a first frame having a predetermined length and a second frame having a frame length shorter than the frame length of the first frame, and the second frame is included in the first frame. Frame is generated,
The transmission timing of the first frame of each communication system is synchronized by synchronization means,
The second frame corresponding to the first frame of each synchronized communication system is generated by the time division data communication device mutually exclusive so that the respective time zones do not overlap each other,
The time division data communication apparatus, wherein the data communication of the corresponding communication system is performed in the time division data communication apparatus by the second frames of the communication systems generated exclusively from each other. In a time division data communication system having a plurality of communication systems that perform time division data communication using a frame as a communication unit between a master unit and a slave unit via a communication line and that needs to prevent crosstalk between the communication lines of the communication system A time division data communication device used as the base unit,
In the time division data communication apparatus, the frame is composed of a first frame having a predetermined length and a second frame having a frame length shorter than the frame length of the first frame, and the second frame is included in the first frame. Frame is generated,
The transmission timing of the first frame of each communication system is synchronized by synchronization means,
The time division data communication device is mutually exclusive so that the corresponding second frame does not overlap with each first frame in the same time zone of each synchronized communication system. Generated
The data communication of the corresponding communication system is performed in the time division data communication device by the second frame of the communication systems generated exclusively in the first frame in the same time zone. A time division data communication apparatus characterized by the above. In the time division data communication apparatus according to claim 9 or 10,
The time-division data communication apparatus, wherein a frame length of the second frame is variable. The time division data communication apparatus according to claim 10,
The frame length of the second frame is variable;
In the first frame in the same time zone of each communication system, when the communication amount of the other communication system other than the one communication system is zero, the total frame length of the first frame of the one communication system The time division data communication device is characterized in that the communication of the first communication system is performed by the time division data communication device using the second frame of the first communication system. In the time division data communication apparatus according to any one of claims 10 to 12,
2. The time division data communication apparatus according to claim 1, wherein the second frame is generated at an arbitrary time zone in the first frame. In the time division data communication apparatus according to any one of claims 10 to 13,
The communication amount of each of the second frames in the first frame in the same time zone of each communication system is communicated between the communication systems,
The second frame having a frame length corresponding to the communication amount of each of the second frames in the first frame in the same time zone of each communication system is the same time zone of the corresponding communication system. The time division data communication device is generated by the time division data communication device in the first frame. The time division data communication apparatus according to claim 14,
In accordance with the communication amount of each of the second frames in the first frame in the same time zone of each communication system, the first of the same time zone of each communication system based on a communication right allocation rule. The second frame having a frame length corresponding to the communication amount of each of the second frames in the second frame is transferred to the first frame in the same time zone of the corresponding communication system. A time-division data communication device generated by The time division data communication apparatus according to claim 14,
Same for each communication system according to a communication right allocation rule predetermined according to a ratio of the communication amount of each of the second frames in the first frame in the same time zone of each communication system The second frame having a frame length corresponding to the communication amount of each of the second frames in the first frame in the time zone is the first frame in the same time zone of the corresponding communication system. The time division data communication device is generated by the time division data communication device. In the time division data communication apparatus according to claim 9,
The second frame corresponding to the first frame of each of the synchronized communication systems is generated by the time division data communication device mutually exclusively so that the respective time zones do not overlap, The second frame of each of the communication systems generated exclusively of each other can select and set a function in which the corresponding data communication of the communication system is performed in the time division data communication device,
In the communication system time division data communication apparatus that does not require the prevention of crosstalk between the communication lines, the second frame corresponding to the first frame of each synchronized communication system has a respective time zone. The time-sharing data communication devices are generated exclusively by the time division data communication device so as not to overlap each other, and the second frame of each communication system generated exclusively by the mutual communication causes the corresponding data communication of the communication system to be performed at the time. A time-division data communication apparatus characterized in that selection of functions performed in the division-data communication apparatus is not set. The time division data communication apparatus according to claim 10,
The time division data communication device is mutually exclusive so that the corresponding second frame does not overlap with each first frame in the same time zone of each synchronized communication system. The time-division data communication device generates the corresponding data communication of the communication system by the second frame of the communication systems generated exclusively and in the first frame of the same time zone. Can be selected and set in
In the time division data communication device of the communication system that does not require the prevention of crosstalk between the communication lines, the second frame corresponding to each of the first frames in the same time zone of each synchronized communication system is respectively The time-sharing data communication devices are mutually exclusive so as not to overlap with each other, and the communication systems of the communication systems generated exclusively in the first frame in the same time zone The time-division data communication apparatus is characterized in that the function setting for performing the corresponding data communication of the communication system in the time-division data communication apparatus is not set by the second frame.