JP5460245B2 - Communications system - Google Patents

Description

  The present invention relates to a communication system that periodically sends a message from a transmitting device to a receiving device.

  Conventionally, in communication systems that require high reliability such as monitoring and control applications, data is transmitted and received while checking whether communication can be maintained between the transmitting device and the receiving device. . For example, as shown in FIG. 28, a transmission packet PA (message B) for data communication is periodically transmitted from the transmission device 1 to the reception device 2 while periodically transmitting a transmission packet PA (message A) for checking the parent-child relationship. Is sent to the receiving device 2.

  In this case, since the transmission packet PA and the transmission packet PB are transmitted separately, communication traffic increases. On the other hand, if the transmission packet PA and the transmission packet PB are combined and transmitted together in one communication packet, the communication traffic can be reduced.

  For example, Patent Document 1 discloses a “disk array control device that, when there are a plurality of transmission data having the same transmission destination stored in a buffer, sends them together in one composite packet”. . This technique suggests that in FIG. 28, the transmission packet PA and the transmission packet PB are combined and combined into one communication packet (composite packet) and sent in the same transmission cycle.

Japanese Patent Laid-Open No. 10-333836

  However, in the technique suggested by Patent Document 1 described above, data accumulated in the transmission buffer is a target of a composite packet, and therefore, there may be a case where the data is not necessarily combined even if the destination is the same. Specifically, the frequency at which the transmission packet PA and the transmission packet PB are combined differs depending on the generation status of the transmission request. When the transmission request frequency is high, the ratio of transmission as a composite packet increases. When the frequency is low, the rate of transmission independently without combining is high.

  The present invention has been made to solve such a problem, and the object of the present invention is to always transmit a plurality of messages having different transmission cycles even when the transmission request frequency is low. It is to provide a communication system.

In order to achieve such an object, the present invention provides a transmission device having a first period in a communication system including a transmission device and a reception device that receives a message periodically transmitted from the transmission device. A first transmission side message management means for managing a first message having a transmission period, and a second transmission side for managing a second message having a second period that is an integral multiple of the first period. A message management unit, a transmission timing management unit that manages the transmission timing of the first message and the transmission timing of the second message, a message transmission unit that transmits a message to the reception device, and a reception device A response message receiving means for receiving a response message from the first device, and receiving the response message from the transmitting device. Receiving a message sent from the transmitting device, a first receiving message managing means managing the second message, a second receiving message managing means managing the second message sent from the sending device, and Message receiving means and response message transmitting means for returning a response message to the message sent from the transmitting device are provided, and the first message transmission means sends transmission timing of the first message from the transmission timing management means. The first transmission message notifying means for generating the transmission message including the first message and notifying the generated transmission message to the second transmission side message management means is provided, and the second transmission side The message management means receives the first message from the first sending message management means. In response to the notification of the transmission message, it is confirmed whether or not the current timing is the transmission timing of the second message, and if it is the transmission timing of the second message, the notified first message is included. The second message is included in the transmission message, and second transmission message notification means for notifying the message transmission means of the transmission message including the second message is provided. The transmission message notified from the management unit is transmitted to the reception device, and the message reception unit receives the transmission message transmitted from the transmission device and notifies the second reception side message management unit to the second reception side. Whether the message management means includes the second message in the transmission message notified from the message reception means. If the second message is included, the second message is taken out, and the transmission message from which the second message is taken out is notified to the first receiving-side message management means, 1 receiving side message management means checks whether or not the first message is included in the transmission message notified from the second receiving side message management means, and if the first message is included, The first message is extracted, and the first receiving message management means further includes the first message when the first message is included in the transmission message notified from the second receiving message management means. A response transmission message including a first response message for the message is generated, and the generated response transmission message is used as a second receiver message manager. When the second message is included in the transmission message notified from the message receiving means, the second receiving-side message management means sends a second response message for the second message to the first message. It is included in the response transmission message notified from the reception side message management means, and the response transmission message including the second response message is notified to the response message transmission means. The response message transmission means is the second reception side message. The response transmission message notified from the management unit is transmitted to the transmission device, and the response message reception unit receives the response transmission message transmitted from the reception device and notifies the second transmission side message management unit to the second transmission message. The sending side message management means includes a second response sending message notified from the response message receiving means. It is confirmed whether or not a response message is included. If the second response message is included, the second response message is extracted, and the response transmission message from which the second response message is extracted is the first response message. The first sending message management means checks whether or not the first sending message is included in the sending response message notified from the second sending message management means. However, when the first response message is included, the first response message is extracted .

  In the present invention, for example, if the first cycle is 1 minute and the second cycle is 3 minutes, the transmission timing management unit sends the 1-minute cycle to the first transmission message notification unit in the first transmission-side message management unit. To give an instruction of the transmission timing of the first message. The first transmission message notifying unit receives the instruction of the transmission timing of the first message from the transmission timing management unit, generates a transmission message including the first message (message A), and transmits the generated transmission message. The second transmission message notification means in the second transmission side message management means is notified. The second transmission message notification means receives the notification of the transmission message including the first message, confirms whether or not the current timing is the transmission timing of the second message, and transmits the second message. If it is, the second message (message B) is included in the transmission message including the notified first message, and the transmission message including the second message is notified to the message transmission means. The message transmission means transmits the notified transmission message to the receiving device. As a result, the transmission message is transmitted to the receiving device at a cycle of 1 minute, and the transmission message includes the second message (message B) at a cycle of 3 minutes based on the first message (message A). It will be.

  In the present invention, the second transmission message notification means in the second transmission-side message management means receives the notification of the transmission message including the first message, and the current timing is the transmission timing of the second message. In this case, the transmission timing management means may be inquired as to whether or not the current timing is the transmission timing of the second message. You may make it notify a 2nd transmission message notification means whether it is a message transmission timing.

  In the present invention, a plurality of transmission-side message management means having different message transmission cycles managed in the same configuration as the second transmission-side message management means are provided between the first transmission-side message management means and the message transmission means. A layer may be provided. For example, a transmission side message management means for managing a second message (message B) with a transmission period of 3 minutes between the first transmission side message management means and the message transmission means, and a transmission period of 4 minutes If the transmission side message management means for managing the third message (message C) is provided, the second message (message B) is based on the first message (message A) as the transmission message to the receiving device. ) Is included in a cycle of 3 minutes, and the third message (message C) is included in a cycle of 4 minutes.

  According to the present invention, in response to the instruction of the transmission timing of the first message from the transmission timing management means, a transmission message including the first message is generated, and the transmission message including the generated first message is notified. In response to this, it is confirmed whether or not the current timing is the transmission timing of the second message, and if it is the transmission timing of the second message, the second message is added to the transmission message including the notified first message. Thus, regardless of the transmission request frequency, a plurality of messages having the same destination and different transmission cycles can be transmitted together.

It is a block diagram which shows the principal part of one Embodiment of the communication system which concerns on this invention. It is a figure which shows the relationship between the request message which the transmission device in this communication system transmits to a reception device, and the transmission period of the request message. It is a figure which shows the management condition of the transmission timing of transmission cycle T1, T2, T3 in the transmission timing management part of the transmission device in this communication system. It is a flowchart for demonstrating the process in the transmission timing management part of the transmission device in this communication system. It is a flowchart for demonstrating the process in the transmission side message management part of the uppermost layer (1st layer) of the transmission device in this communication system. It is a flowchart for demonstrating the process at the time of the notification transmission request message in the transmission side message management part of the 2nd layer of the transmission device in this communication system, and a 3rd layer (lowermost layer). It is a flowchart for demonstrating the process in the request message transmission part of the transmission device in this communication system. It is a flowchart for demonstrating the process in the response message receiving part of the transmission device in this communication system. It is a flowchart for demonstrating the process at the time of the notification transmission message notification in the transmission side message management part of the 2nd layer of the transmission device in this communication system, and a 3rd layer (lowermost layer). It is a flowchart for demonstrating the process at the time of the response transmission message notification in the transmission side message management part of the uppermost layer (1st layer) of the transmission device in this communication system. It is a flowchart for demonstrating the process in the request message receiving part of the receiving device in this communication system. It is a flowchart for demonstrating the process at the time of the notification transmission of the request transmission message in the receiving side message management part of the 2nd layer of the receiving device in this communication system, and a 3rd layer (lowermost layer). It is a flowchart for demonstrating the process at the time of the request transmission message notification in the receiving side message management part of the uppermost layer (1st layer) of the receiving device in this communication system. It is a flowchart for demonstrating the process at the time of the response transmission message notification in the receiving side message management part of the 2nd layer of the receiving device in this communication system, and a 3rd layer (lowermost layer). It is a flowchart for demonstrating the process in the response message transmission part of the receiving device in this communication system. It is a figure which shows the format of the request transmission message transmitted from the transmission device in this communication system. It is a figure which shows a mode that the request | requirement transmission message in the transmission side message management part of each layer of the transmission device in this communication system is produced | generated (in the case of transmission of the 0th minute). It is a figure which shows a mode that the request | requirement transmission message in the receiving side message management part of each layer of the receiving device in this communication system is divided and acquired (in the case of transmission in the 0th minute). It is a figure which shows the format of the response transmission message transmitted from the receiving device in this communication system. It is a figure which shows a mode that the response transmission message in the receiving side message management part of each layer of the receiving device in this communication system is produced | generated (in the case of transmission of the 0th minute). It is a figure which shows a mode that the response transmission message in the transmission side message management part of each layer of the transmission device in this communication system is divided and acquired (in the case of transmission in the 0th minute). It is a figure which shows a mode that transmission of the request transmission message from a transmission device and return of the response transmission message from a reception device are performed by a 1 minute period. It is a figure which shows a mode that the request | requirement transmission message is produced | generated in the transmission side message management part of each layer of the transmission device in this communication system (in the case of transmission of the 4th minute). It is a figure which shows a mode that the request | requirement transmission message in the receiving side message management part of each layer of the receiving device in this communication system is divided and acquired (in the case of transmission of the 4th minute). It is a figure which shows a mode that the response transmission message in the receiving side message management part of each layer of the receiving device in this communication system is produced | generated (in the case of transmission of the 4th minute). It is a figure which shows a mode that the response transmission message in the transmission side message management part of each layer of the transmission device in this communication system is divided and acquired (in the case of transmission of the 4th minute). It is a functional block diagram of the communication system which concerns on this invention when a communication hierarchy is made into 2 layers. It is a figure explaining the periodic transmission system of the transmission packet for the parent-child relationship check from the transmission device to the receiving device in the past, and the transmission packet for data communication.

  Hereinafter, the present invention will be described in detail based on embodiments. FIG. 1 is a block diagram showing an embodiment of a communication system according to the present invention.

  In FIG. 1, 100 is a transmitting device, and 200 is a receiving device. The transmission device 100 includes a first transmission-side message management unit 101, a second transmission-side message management unit 102, a third transmission-side message management unit 103, a transmission timing management unit 104, and a request message transmission unit 105. And a response message receiving unit 106. The receiving device 200 includes a first receiving message management unit 201, a second receiving message management unit 202, a third receiving message management unit 203, a request message receiving unit 204, and a response message transmitting unit 205. And.

  The transmission device 100 includes three communication layers, the transmission-side message management unit 101 manages the first layer request message A with a transmission cycle of 1 minute, and the transmission-side message management unit 102 has a transmission cycle of 3 minutes. The request message B in the second layer is managed, and the transmission side message management unit 103 manages the request message C in the third layer with a transmission cycle of 4 minutes.

  In the transmission device 100, the transmission destination devices of the request messages A, B, and C are determined. In this example, the transmission destination devices of the request messages A, B, and C are the same reception device 200, and the destination address α of the reception device 200 is determined for the request messages A, B, and C as destination information. (See FIG. 2).

  In the transmission device 100, the transmission timing management unit 104 has a function of managing the request messages A, B, and C in the same transmission timing. That is, when the transmission cycle of the request message A is T1 (T1 = 1 minute), the transmission cycle of the request message B is T2 (T2 = 3 minutes), and the transmission cycle of the request message C is T3 (T3 = 4 minutes), As shown in FIGS. 3A, 3B, and 3C, the transmission timing management unit 104 synchronizes the transmission periods T1, T2, and T3, and matches the transmission timings of the request messages A, B, and C. The transmission periods T1, T2, and T3 are managed in a state where the transmission timings are matched.

  In the receiving device 200, the receiving side message management unit 201 manages the first layer request message A sent from the transmitting device 100, and the receiving side message management unit 202 sends the second layer request message A sent from the transmitting device 100. The request message B is managed, and the reception-side message management unit 203 manages the third-layer request message C sent from the transmission device 100.

  The transmission device 100 and the reception device 200 are realized by hardware including a processor and a storage device, and a program that realizes various functions in cooperation with the hardware. Hereinafter, functions unique to the present embodiment included in each unit in the transmission device 100 and the reception device 200 will be described with reference to flowcharts illustrated in FIGS. 4 to 15.

[0 minute transmission]
Send request message
In the transmission device 100, when the transmission timing of the request message A is reached (FIG. 4: YES in step S11), the transmission timing management unit 104 sends a request message A to the transmission message management unit 101 in the uppermost layer (first layer). Is transmitted (step S12, FIG. 1: arrow (1)). In this case, the transmission timing of the request message A, B, and C that coincide with the transmission timing of the request message A, B, and C (point t0 shown in FIG. 3) of the transmission of the request message A that visits every 1 minute as the 0-minute transmission. And

  The transmission-side message management unit 101 receives the instruction of the transmission timing of the request message A from the transmission timing management unit 104 (FIG. 5: YES in step S21), and generates a request transmission message including the request message A from its own layer. Then, the generated request transmission message is notified to the next layer (second layer) transmission side message management unit 102 together with the destination address α (step S23, FIG. 1: arrow (2)).

  FIG. 16 shows the format of the request transmission message. In this request transmission message format, F1 is the presence / absence of the request message of the first layer, F2 is the presence / absence of the request message of the second layer, F3 is the presence / absence of the request message of the third layer, and F4 is the request message length of the first layer. , F5 is the first layer request message, F6 is the second layer request message length, F7 is the second layer request message, F8 is the third layer request message length, and F9 is the third layer request message write area. Indicates.

  In step S22 described above, the transmission-side message management unit 101 generates a request transmission message DM1 as illustrated in FIG. 17A as a request transmission message including the request message A from the own layer. In this request transmission message DM1, the flag “1” indicating the presence of the first layer message is written in the area F1, the message length L1 of the request message A is written in the area F4, and the main body of the request message A is written in the area F5. .

  The transmission side message management unit 102 receives the notification of the request transmission message DM1 from the transmission side message management unit 101 (FIG. 6: YES in step S31), and inquires of the transmission timing management unit 104 about the current timing (step S32, Figure 1: Arrow (3)).

  The transmission timing management unit 104 receives an inquiry about the current timing from the transmission side message management unit 102 (YES in step S13), and determines whether or not the current timing is the transmission timing of the request message B. Notification to the unit 102 (step S14, FIG. 1: arrow (4)). In this case, since transmission is at the 0th minute and the current timing is the transmission timing of the request message B, the fact is notified to the transmission side message management unit 102.

  Upon receiving the notification that it is the transmission timing of the request message B from the transmission timing management unit 104 (YES in step S33), the transmission-side message management unit 102 transmits the destination address α of the request message B together with the request transmission message DM1. After confirming that it matches the received destination address α (YES in step S34), the request message B from the own layer is included in the request transmission message DM1 notified from the transmission timing management unit 104 (step S35). ).

  In this case, the transmission-side message management unit 102 generates a request transmission message DM2 as illustrated in FIG. 17B as a request transmission message including the request message B. In this request transmission message DM2, the flag “1” indicating the presence of the second layer message is written in the area F2, the message length L2 of the request message B is written in the area F6, and the main body of the request message B is written in the area F7. . Note that the head position of the request message B including the message length L2 can be determined from the message length L1.

  Then, the transmission side message management unit 102 notifies the request transmission message DM2 including the request message B to the transmission side message management unit 103 of the next layer (third layer (lowermost layer)) together with the destination address α (step) S36, FIG. 1: Arrow (5)).

  The transmission side message management unit 103 receives the notification of the request transmission message DM2 from the transmission side message management unit 102 (YES in step S31), and inquires of the transmission timing management unit 104 about the current timing (step S32, FIG. 1: FIG. 1). Arrow (6)).

  The transmission timing management unit 104 receives an inquiry about the current timing from the transmission side message management unit 103 (YES in step S13), and determines whether or not the current timing is the transmission timing of the request message C. Notification to the unit 103 (step S14, FIG. 1: arrow (7)). In this case, since transmission is at the 0th minute and the current timing is the transmission timing of the request message C, this is notified to the transmission side message management unit 103.

  Upon receiving the notification that it is the transmission timing of the request message C from the transmission timing management unit 104 (YES in step S33), the transmission-side message management unit 103 sends the destination address α of the request message C together with the request transmission message DM2. After confirming that it matches the received destination address α (YES in step S34), the request message C2 from the own layer is included in the request transmission message DM2 notified from the transmission timing management unit 104 (step S35). ).

  In this case, the transmission-side message management unit 103 generates a request transmission message DM3 as shown in FIG. 17C as a request transmission message including the request message C. In the request transmission message DM3, a flag “1” indicating the presence of the third layer message is written in the area F3, the message length L3 of the request message C is written in the area F8, and the main body of the request message C is written in the area F9. . The head position of the request message C including the message length L3 can be determined from the message lengths L1 and L2.

  Then, the transmission-side message management unit 103 notifies the request message transmission unit 105 of the request transmission message DM3 including the request message C together with the destination address α (step S36, FIG. 1: arrow (8)).

  The request message transmission unit 105 receives the request transmission message DM3 from the transmission-side message management unit 103 (FIG. 7: YES in step S41), and transmits the notified request transmission message DM3 from the transmission device 100 as a request. The message DM is transmitted to the receiving device 200 specified by the destination address α sent together with the request transmission message DM3 (step S42, FIG. 1: arrow (9)).

[Reception of request message]
When receiving the request transmission message DM from the transmission device 100 in the receiving device 200 (FIG. 11: YES in step S51), the request message receiving unit 204 sets the received request transmission message DM as the request transmission message DM3 (FIG. 18). (Refer to (a)), and notify the message management unit 203 on the lowest layer (third layer) (step S52, FIG. 1: arrow (10)).

  When receiving the notification of the request transmission message DM3 from the request message reception unit 204 (FIG. 12: YES in step S61), the reception-side message management unit 203 includes the request message C addressed to its own layer in the request transmission message DM3. It is checked whether or not (step S62).

  In this case, since the flag “1” is written in the area F3 of the request transmission message DM3, the reception-side message management unit 203 determines that the request message C addressed to the own layer is included (YES in step S62). The request message C addressed to the own layer is divided and acquired from the request transmission message DM3 (see step S63, FIG. 18B). Then, the remaining request transmission message DM2 is notified to the message management unit 202 on the next layer (second layer) (step S64, FIG. 1: arrow (11)).

  The message management unit 203 on the receiving side is notified when the request transmission message DM3 notified from the request message receiving unit 204 does not include the request message C addressed to its own layer (NO in step S62). The request transmission message DM3 is notified as it is as the response transmission message DM2 to the reception side message management unit 202 in the next layer (second layer) (step S65).

  When receiving the notification of the request transmission message DM2 from the reception side message management unit 203 (YES in Step S61), the reception side message management unit 202 includes the request message B addressed to the own layer in the request transmission message DM2. It is checked whether or not (step S62).

  In this case, since the flag “1” is written in the area F2 of the request transmission message DM2, the reception-side message management unit 202 determines that the request message B addressed to the own layer is included (YES in step S62). ), The request message B addressed to the own layer is acquired from the request transmission message DM2 (see step S63, FIG. 18C). Then, the remaining request transmission message DM1 is notified to the message management unit 201 on the next layer (first layer (uppermost layer)) (step S64, FIG. 1: arrow (12)).

  The reception-side message management unit 202 is notified when the request message B2 addressed to the own layer is not included in the request transmission message DM2 notified from the reception-side message management unit 203 (NO in step S62). The request transmission message DM2 is notified as it is as the response transmission message DM1 to the reception-side message management unit 201 in the next layer (first layer (uppermost layer)) (step S65).

  When receiving the notification of the request transmission message DM1 from the reception side message management unit 202 (FIG. 13: YES in step S71), the reception side message management unit 201 includes the request message A addressed to the own layer in the request transmission message DM1. It is checked whether or not it is (step S72).

  In this case, since the flag “1” is written in the area F1 of the request transmission message DM1, the reception-side message management unit 201 determines that the request message A addressed to the own layer is included (YES in step S72). ), The request message A addressed to the own layer is acquired from the request transmission message DM1 (step S73).

[Send response message]
When the reception-side message management unit 201 acquires the request message A addressed to the own layer from the request transmission message DM1 from the reception-side message management unit 202 (step S73), the response transmission message including the response message A for the acquired request message A Is generated (step S74), and the generated response transmission message is notified to the receiving message management unit 202 of the next layer (second layer) (step S75, FIG. 1: arrow (13)).

  FIG. 19 shows the format of the response transmission message. In this response transmission message format, G1 is the presence / absence of the first layer response message, G2 is the presence / absence of the second layer response message, G3 is the presence / absence of the third layer response message, and G4 is the first layer response message length. , G5 is a response message of the first layer, G6 is a response message length of the second layer, G7 is a response message of the second layer, G8 is a response message length of the third layer, and G9 is an area for writing a response message of the third layer Indicates.

  In step S74 described above, the reception-side message management unit 201 generates a response transmission message AM1 as illustrated in FIG. 20A as a response transmission message including the response message A from the own layer. In this response transmission message AM1, the flag “1” indicating the presence of the first layer message is written in the region G1, the message length L1 of the response message A is written in the region G4, and the main body of the response message A is written in the region G5. .

  If the request message A1 addressed to the own layer is not included in the request transmission message DM1 from the reception-side message management unit 202 (NO in step S72), the reception-side message management unit 201 sends a response message A. A response transmission message AM1 that is not included is generated (step S76), and the generated response transmission message is notified to the reception side message management unit 202 of the next layer (second layer) (step S75).

  When receiving the notification of the response transmission message AM1 from the receiving-side message managing unit 201 (FIG. 14: YES in step S81), the receiving-side message managing unit 202 acquires the request message B addressed to its own layer at this cycle. (YES in step S82), the response message B to the acquired request message B is included in the notified response transmission message AM1 (step S83).

  In this case, the reception-side message management unit 202 generates a response transmission message AM2 as shown in FIG. 20B as a response transmission message including the response message B. In this response transmission message AM2, the flag “1” indicating the presence of the second layer message is written in the area G2, the message length L2 of the response message B is written in the area G6, and the main body of the response message B is written in the area G7. . The head position of the response message B including the message length L2 can be determined from the message length L1.

  Then, the reception side message management unit 202 notifies the response transmission message AM2 including the response message B to the reception side message management unit 203 of the next layer (third layer (lowermost layer)) (step S84, FIG. 1). : Arrow (14)).

  In addition, when the receiving side message management unit 202 does not acquire the request message B addressed to the own layer in this cycle (NO in step S82), the receiving side message management unit 202 receives the response message AM1 notified from the receiving side message management unit 201. The response message AM2 is notified as it is to the message management unit 203 on the receiving layer (third layer (lowermost layer)) (step S85).

  When receiving the notification of the response transmission message AM2 from the receiving-side message managing unit 202 (YES in step S81), the receiving-side message managing unit 203 acquires the request message C addressed to its own layer at this cycle ( In step S82, YES), the notified response transmission message AM2 includes the response message C for the acquired request message C (step S83).

  In this case, the reception-side message management unit 203 generates a response transmission message AM3 as shown in FIG. 20C as a response transmission message including the response message C. In this response transmission message AM3, the flag “1” indicating the presence of the third layer message is written in the region G3, the message length L3 of the response message C is written in the region G8, and the main body of the response message C is written in the region G9. . The head position of the response message C including the message length L3 can be determined from the message lengths L1 and L2.

  The reception-side message management unit 203 notifies the response message transmission unit 205 of the response transmission message AM3 including the response message C (step S84, FIG. 1: arrow (15)).

  In addition, when the receiving side message management unit 203 does not acquire the request message C addressed to the own layer in this cycle (NO in step S82), the receiving side message management unit 203 receives the response message AM2 notified from the receiving side message management unit 202. The response message transmission unit 205 is notified as it is as the response message AM3 (step S85).

  The response message transmission unit 205 receives the notification of the response transmission message AM3 from the reception side message management unit 203 (FIG. 15: YES in step S91), and transmits the notified response transmission message AM3 from the reception device 200 as a response. The message AM is returned to the transmission device 100 that is the transmission source of the request transmission message DM (step S92, FIG. 1: arrow (16)).

[Reception message reception]
In the transmission device 100, when receiving the response transmission message AM from the reception device 200 (FIG. 8: YES in step S101), the response message receiving unit 106 sets the received response transmission message AM as the response transmission message AM3 (FIG. 21). (See (a)), the lowermost (third layer) transmitting side message management unit 103 is notified (step S102, FIG. 1: arrow (17)).

  When receiving the notification of the response transmission message AM3 from the response message receiving unit 106 (FIG. 9: YES in step S111), the transmission-side message management unit 103 includes the response message C addressed to the own layer in the response transmission message AM3. It is checked whether or not (step S112).

  In this case, since the flag “1” is written in the area G3 of the response transmission message AM3, the transmission side message management unit 103 determines that the response message C addressed to the own layer is included (YES in step S112). ), The response message C addressed to the own layer is divided and acquired from the response transmission message AM3 (see step S113, FIG. 21B). Then, the remaining response transmission message AM2 is notified to the message management unit 102 on the next layer (second layer) (step S114, FIG. 1: arrow (18)).

  When the response transmission message AM3 does not include the response message C addressed to the own layer (NO in step S112), the transmission-side message management unit 103 notifies the response transmission message notified from the response message reception unit 106. AM3 is sent as it is as a response transmission message AM2 to the message management unit 102 on the next layer (second layer) (step S115).

  When receiving the notification of the response transmission message AM2 from the transmission side message management unit 103 (YES in step S111), the transmission side message management unit 102 includes the response message B addressed to the own layer in the response transmission message AM2. It is checked whether or not (step S112).

  In this case, since the flag “1” is written in the area G2 of the response transmission message AM2 from the transmission side message management unit 102, the transmission side message management unit 102 includes the response message B addressed to the own layer. (YES in step S112), the response message B addressed to the own layer is acquired from the response transmission message AM2 (see step S113, FIG. 21C). Then, the remaining response transmission message AM1 is notified to the transmission side message management unit 101 of the next layer (first layer (uppermost layer)) (step S114, FIG. 1: arrow (19)).

  If the response message B2 addressed to the own layer is not included in the response transmission message AM2 from the transmission message management unit 103 (NO in step S112), the transmission side message management unit 102 notifies the notified response. The transmission message AM2 is notified as it is as a response transmission message AM1 to the transmission side message management unit 101 in the next layer (first layer (uppermost layer)) (step S115).

  When receiving the notification of the response transmission message AM1 from the transmission side message management unit 102 (FIG. 10: YES in step S121), the transmission side message management unit 101 includes the response message A addressed to the own layer in the response transmission message AM1. It is checked whether or not (step S122).

  In this case, since the flag “1” is written in the area G1 of the response transmission message AM1, it is determined that the response message A addressed to the own layer is included (YES in step S122), and the response transmission message AM1 The response message A addressed to the layer is acquired (step S123).

  Note that if the response transmission message AM1 does not include the response message A addressed to the own layer (NO in step S122), the transmission-side message management unit 101 ends the response transmission message reception processing as it is.

  In this way, in the transmission at the 0th minute, as shown as point t0 in FIG. 22, the request transmission message DM including the request messages A, B, and C is transmitted from the transmission device 100 to the reception device 200, and the reception device 200 The response transmission message AM including the response messages A, B, and C is returned to the transmission device 100.

[1st minute transmission]
Send request message
When the transmission timing of the next request message A is reached (YES in step S11), the transmission timing management unit 104 instructs the transmission message management unit 101 of the uppermost layer (first layer) on the transmission timing of the request message A. (Step S12, FIG. 1: arrow (1)).

  In response to the transmission timing instruction of the request message A from the transmission timing management unit 104 (YES in step S21), the transmission-side message management unit 101 generates a request transmission message DM1 including the request message A from its own layer ( In step S22), the generated request transmission message DM1 is notified to the next layer (second layer) transmission side message management unit 102 together with the destination address α of the request message A (step S23, FIG. 1: arrow (2)).

  The transmission-side message management unit 102 receives the notification of the request transmission message DM1 from the transmission-side message management unit 101 (YES in step S31), and inquires the transmission timing management unit 104 about the current timing (step S32, FIG. 1: FIG. 1). Arrow (3)).

  The transmission timing management unit 104 receives an inquiry about the current timing from the transmission side message management unit 102 (YES in step S13), and determines whether or not the current timing is the transmission timing of the request message B. Notification to the unit 102 (step S14, FIG. 1: arrow (4)). In this case, since the transmission is for the first minute and the current timing is not the transmission timing of the request message B, the transmission side message management unit 102 is notified of this.

  Upon receiving the notification that it is not the transmission timing of the request message B from the transmission timing management unit 104 (NO in step S33), the transmission side message management unit 102 receives the request transmission message DM1 from the transmission side message management unit 101 as it is. A request transmission message DM2 is notified to the transmission side message management unit 103 of the next layer (third layer (lowermost layer)) (step S37).

  The transmission side message management unit 103 receives the notification of the request transmission message DM2 from the transmission side message management unit 102 (YES in step S31), and inquires of the transmission timing management unit 104 about the current timing (step S32, FIG. 1: FIG. 1). Arrow (6)).

  The transmission timing management unit 104 receives an inquiry about the current timing from the transmission side message management unit 103 (YES in step S13), and determines whether or not the current timing is the transmission timing of the request message C. Notification to the unit 103 (step S14, FIG. 1: arrow (7)). In this case, since transmission is in the first minute and the current timing is not the transmission timing of the request message C, the transmission side message management unit 103 is notified accordingly.

  Upon receiving the notification that it is not the transmission timing of the request message C from the transmission timing management unit 104 (NO in step S33), the transmission side message management unit 103 receives the request transmission message DM2 from the transmission side message management unit 102 as it is. The request message transmission unit 105 is notified as the request transmission message DM3 (step S37, FIG. 1: arrow (8)).

  The request message transmission unit 105 receives the notification of the request transmission message DM3 from the transmission side message management unit 103 (YES in Step S41), and uses the notified request transmission message DM3 as the request transmission message DM from the transmission device 100. The data is transmitted to the receiving device 200 (step S42, FIG. 1: arrow (9)).

[Reception of request message]
In the receiving device 200, when receiving the request transmission message DM from the transmission device 100 (YES in step S51), the request message receiving unit 204 sets the received request transmission message DM as the request transmission message DM3 as the lowest layer (three layers). Eye) to the receiving message manager 203 (step S52, FIG. 1: arrow (10)).

  When receiving the request transmission message DM3 from the request message reception unit 204 (YES in step S61), the reception-side message management unit 203 determines whether the request transmission message DM3 includes the request message C addressed to its own layer. Is checked (step S62).

  In this case, since the request message C addressed to the own layer is not included, the reception side message management unit 203 uses the request message DM3 notified from the reception side message management unit 204 as the request transmission message DM2 as it is as the next layer (two layers). Eye) to the receiving message manager 202 (step S65, FIG. 1: arrow (11)).

  When receiving the notification of the request transmission message DM2 from the reception side message management unit 203 (YES in Step S61), the reception side message management unit 202 includes the request message B addressed to the own layer in the request transmission message DM2. It is checked whether or not (step S62).

  In this case, since the request message B addressed to the own layer is not included, the reception side message management unit 202 uses the request message DM2 notified from the reception side message management unit 203 as the request transmission message DM1 as it is as the next layer (one layer). (Reception side (top layer)) is notified to the message manager 201 on the receiving side (step S65, FIG. 1: arrow (12)).

  Receiving side message manager 201 receives notification of request transmission message DM1 from receiving side message manager 202 (YES in step S71), does request transmission message DM1 include request message A addressed to its own layer? It is checked whether or not (step S72).

  In this case, since the request message A addressed to the next layer is included, the reception-side message management unit 201 acquires the request message A addressed to the own layer from the request transmission message DM1 (step S73). Then, a response transmission message AM1 including the response message A with respect to the acquired request message A is generated (step S74), and the generated response transmission message is notified to the reception side message management unit 202 of the next layer (second layer) ( Step S75, FIG. 1: Arrow (13)).

  When receiving the notification of the response transmission message AM1 from the receiving-side message managing unit 201 (YES in step S81), the receiving-side message managing unit 202 has not acquired the request message B addressed to its own layer in this cycle ( In step S82, NO), the response message AM1 notified from the reception-side message management unit 201 is directly used as the response message AM2 and notified to the reception-side message management unit 203 in the next layer (third layer (lowermost layer)) (step S85). FIG. 1: Arrow (14)).

  When receiving the notification of the response transmission message AM2 from the receiving-side message managing unit 202 (YES in step S81), the receiving-side message managing unit 203 has not acquired the request message C addressed to its own layer in this cycle ( In step S82, the response message AM2 notified from the message management unit 202 on the receiving side is directly notified to the response message transmission unit 205 as the response message AM3 (step S85, FIG. 1: arrow (15)).

  The response message transmission unit 205 receives the notification of the response transmission message AM3 from the reception side message management unit 203 (YES in step S91), and uses the notified response transmission message AM3 as the response transmission message AM from the reception device 200. The request transmission message DM3 is returned to the transmission device 100 (step S92, FIG. 1: arrow (16)).

[Reception message reception]
In the transmission device 100, when the response message receiving unit 106 receives the response transmission message AM from the reception device 200 (YES in step S101), the received response transmission message AM is set as the response transmission message AM3 and the lowest layer (three layers). Eye) is sent to the sending message management unit 103 (step S102, FIG. 1: arrow (17)).

  When receiving the notification of the response transmission message AM3 from the response message reception unit 106 (YES in step S111), the transmission-side message management unit 103 determines whether or not the response transmission message AM3 includes the response message C addressed to its own layer. Is checked (step S112).

  In this case, since the response message C3 addressed to the own layer is not included in the response transmission message AM3 (NO in step S112), the transmission-side message management unit 103 uses the response transmission message AM3 notified from the response message reception unit 106. As it is, it is notified as the response transmission message AM2 to the message management unit 102 in the next layer (second layer) (step S115, FIG. 1: arrow (18)).

  When receiving the notification of the response transmission message AM2 from the transmission side message management unit 103 (YES in step S111), the transmission side message management unit 102 includes the response message B addressed to the own layer in the response transmission message AM2. It is checked whether or not (step S112).

  In this case, since the response message B2 addressed to the own layer is not included in the response transmission message AM2 (NO in step S112), the transmission-side message management unit 102 receives the response transmission message AM2 notified from the transmission-side message management unit 103. Is sent as a response transmission message AM1 to the message management unit 101 on the next layer (first layer (uppermost layer)) (step S115, FIG. 1: arrow (19)).

  When receiving the notification of the response transmission message AM1 from the transmission side message management unit 102 (YES in step S121), the transmission side message management unit 101 includes the response message A addressed to the own layer in the response transmission message AM1. It is checked whether or not (step S122).

  In this case, since the response message A addressed to the own layer is included in the response transmission message AM1 (YES in step S122), the transmission-side message management unit 101 sends the response message A addressed to the own layer from the response transmission message AM1. Obtain (step S123).

  In this way, in the transmission of the first minute, as shown as point t1 in FIG. 22, the request transmission message DM including only the request message A is transmitted from the transmission device 100 to the reception device 200, and the response message is transmitted from the reception device 200. A response transmission message AM including only A is returned to the transmission device 100.

  Similarly, in the second transmission, a request transmission message DM including only the request message A is transmitted from the transmission device 100 to the reception device 200, and a response transmission message AM including only the response message A is transmitted from the reception device 200. It is returned to the device 100 (point t2 shown in FIG. 22).

  In the transmission for the third minute, a request transmission message DM including request messages A and B is transmitted from the transmission device 100 to the reception device 200, and a response transmission message AM including response messages A and B is transmitted from the reception device 200 to the transmission device. Returned to 100 (t3 point shown in FIG. 22).

  In the fourth transmission, a request transmission message DM including request messages A and C is transmitted from the transmission device 100 to the reception device 200, and a response transmission message AM including response messages A and C is transmitted from the reception device 200 to the transmission device. Returned to 100 (t4 point shown in FIG. 22). Similarly, transmission of the request transmission message DM and return of the response transmission message AM are performed at a cycle of 1 minute.

[4th minute transmission]
Send request message
As a reference, in the fourth transmission, a request transmission message DM including request messages A and C is transmitted from the transmission device 100 to the reception device 200, and a response transmission message AM including response messages A and C is returned from the reception device 200 as a reply. The state of being performed will be described.

  When the transmission timing of the request message A in the fourth minute is reached, the transmission timing management unit 104 instructs the transmission message management unit 101 of the uppermost layer (first layer) on the transmission timing of the request message A (FIG. 1: Arrow (1)).

  In response to the transmission timing instruction of the request message A from the transmission timing management unit 104, the transmission-side message management unit 101 generates a request transmission message DM1 including the request message A from its own layer (see FIG. 23A). The generated request transmission message DM1 is notified to the message management unit 102 in the next layer (second layer) together with the destination address α of the request message A (FIG. 1: arrow (2)).

  Upon receiving the notification of the request transmission message DM1 from the transmission side message management unit 101, the transmission side message management unit 102 inquires the transmission timing management unit 104 about the current timing (FIG. 1: arrow (3)).

  The transmission timing management unit 104 receives an inquiry about the current timing from the transmission side message management unit 102 and notifies the transmission side message management unit 102 whether or not the current timing is the transmission timing of the request message B ( Figure 1: Arrow (4)). In this case, since transmission is in the fourth minute and the current timing is not the transmission timing of the request message B, the fact is notified to the transmission side message management unit 103.

  Upon receiving the notification that it is not the transmission timing of the request message B from the transmission timing management unit 104, the transmission side message management unit 102 uses the request transmission message DM1 from the transmission side message management unit 102 as the request transmission message DM2 as it is. The message is notified to the transmission-side message management unit 103 (see FIG. 23B).

  Upon receiving the notification of the request transmission message DM2 from the transmission side message management unit 102, the transmission side message management unit 103 inquires of the transmission timing management unit 104 about the current timing (FIG. 1: arrow (6)).

  The transmission timing management unit 104 receives an inquiry about the current timing from the transmission side message management unit 103 and notifies the transmission side message management unit 103 whether or not the current timing is the transmission timing of the request message C ( Fig. 1: Arrow (7)). In this case, since the transmission is in the fourth minute and the current timing is the transmission timing of the request message C, the transmission side message management unit 103 is notified accordingly.

  In response to the notification that it is the transmission timing of the request message C from the transmission timing management unit 104, the transmission-side message management unit 103 receives the notification that the destination address α of the request message C is sent together with the request transmission message DM2. And the request message C2 from the own layer is included in the request transmission message DM2 from the message manager 102 on the transmission side. In this case, a request transmission message DM3 as shown in FIG. 23C is generated as a request transmission message including the request message C.

  Then, the transmission-side message management unit 103 notifies the request message transmission unit 105 of the request transmission message DM3 including the request message C together with the destination address α (FIG. 1: arrow (8)).

  The request message transmission unit 105 receives the notification of the request transmission message DM3 from the transmission-side message management unit 103, and uses the notified request transmission message DM3 as the request transmission message DM from the transmission device 100 together with the request transmission message DM3. The data is transmitted to the receiving device 200 designated by the destination address α sent (FIG. 1: arrow (9)).

[Reception of request message]
In the receiving device 200, when receiving the request transmission message DM3 from the transmission device 100, the request message receiving unit 204 sets the received request transmission message DM3 as the request transmission message DM (see FIG. 24A), and the lowest layer ( Notification is made to the message management unit 203 on the receiving side (third layer) (FIG. 1: arrow (10)).

  When receiving the notification of the request transmission message DM3 from the request message reception unit 204, the reception-side message management unit 203 checks whether or not the request transmission message DM3 includes the request message C addressed to its own layer.

  In this case, since the flag “1” is written in the area F3 of the request transmission message DM3, the reception-side message management unit 203 determines that the request message C addressed to the own layer is included, and the request transmission message DM3. The request message C addressed to its own layer is divided and acquired (see FIG. 24B). Then, the remaining request transmission message DM2 is notified to the message management unit 202 on the next layer (second layer) (FIG. 1: arrow (11)).

  When receiving the notification of the request transmission message DM2 from the reception side message management unit 203, the reception side message management unit 202 checks whether or not the request transmission message DM2 includes the request message B addressed to its own layer.

  In this case, since the request message B addressed to the own layer is not included, the receiving-side message management unit 202 uses the notified request message DM2 as it is as the request transmission message DM1, and uses the next layer (first layer (uppermost layer)). To the receiving-side message management unit 201 (see FIG. 1: arrow (12), FIG. 24 (c)).

  When receiving the notification of the request transmission message DM1 from the reception side message management unit 202, the reception side message management unit 201 checks whether or not the request transmission message DM1 includes the request message A addressed to its own layer.

  In this case, since the flag “1” is written in the area F1 of the request transmission message DM1, the reception-side message management unit 201 determines that the request message A addressed to the own layer is included, and the request transmission message DM1. Request message A addressed to the own layer.

[Send response message]
When the reception-side message management unit 201 acquires the request message A addressed to the own layer from the request transmission message DM1 from the reception-side message management unit 202, the reception-side message management unit 201 generates a response transmission message AM1 including the response message A for the acquired request message A. (Refer to FIG. 25 (a)), the generated response transmission message AM1 is notified to the reception side message management unit 202 of the next layer (second layer) (FIG. 1: arrow (13)).

  When receiving the notification of the response transmission message AM1 from the reception-side message management unit 201, the reception-side message management unit 202 has not acquired the request message B addressed to the own layer in this cycle. Is sent as a response message AM2 to the receiving message management unit 203 in the next layer (third layer (lowermost layer)) (see FIG. 25B).

  When receiving the notification of the response transmission message AM2 from the reception-side message management unit 202, the reception-side message management unit 203 obtains the request message C addressed to the own layer in this cycle. The message AM2 includes the response message C from the own layer with respect to the acquired request message C. In this case, a response transmission message AM3 as shown in FIG. 25C is generated as a response transmission message including the response message C.

  Then, the reception-side message management unit 203 notifies the response message transmission unit 205 of the response transmission message AM3 including the response message C (FIG. 1: arrow (15)).

  The response message transmission unit 205 receives the notification of the response transmission message AM3 from the reception-side message management unit 203, and uses the notified response transmission message AM3 as the response transmission message AM from the reception device 200. It returns to the transmission device 100 of the transmission source (FIG. 1: arrow (16)).

[Reception message reception]
In the transmitting device 100, when receiving the response transmission message AM3 from the receiving device 200, the response message receiving unit 106 sets the received response transmission message AM3 as the response transmission message AM3 (see FIG. 26A), and the lowest layer ( Notification is made to the message management unit 103 in the third layer) (FIG. 1: arrow (17)).

  When receiving the notification of the response transmission message AM3 from the response message receiving unit 106, the transmission-side message management unit 103 checks whether or not the response transmission message AM3 includes the response message C addressed to its own layer.

  In this case, since the flag “1” is written in the area G3 of the response transmission message AM3, the transmission-side message management unit 103 determines that the response message C addressed to the own layer is included, and the response transmission message AM3 The response message C addressed to the own layer is divided and acquired (see FIG. 26B). Then, the remaining response transmission message AM2 is notified to the message management unit 102 on the next layer (second layer) (FIG. 1: arrow (18)).

  When receiving the response transmission message AM2 from the transmission side message management unit 103, the transmission side message management unit 102 checks whether or not the response transmission message AM2 includes the response message B addressed to its own layer.

  In this case, since the response message B addressed to the own layer is not included in the response transmission message AM2, the transmission side message management unit 102 uses the notified response transmission message AM2 as the response transmission message AM1 as it is as the next layer (first layer). (Uppermost layer)) is notified to the transmission-side message management unit 101 (see FIG. 26C).

  When receiving the notification of the response transmission message AM1 from the transmission side message management unit 102, the transmission side message management unit 101 checks whether the response transmission message AM1 includes the response message A addressed to its own layer.

  In this case, since the flag “1” is written in the area G1 of the response transmission message AM1, it is determined that the response message A addressed to the own layer is included, and the response message A addressed to the own layer is transmitted from the response transmission message AM1. To get.

  In this way, in the present embodiment, the request transmission message DM is transmitted to the receiving device 200 in a cycle of 1 minute, and the message B is transmitted in a cycle of 3 minutes based on the message A in the request transmission message DM. In other words, the message C is included every four minutes, and a plurality of messages having different transmission periods can be transmitted together without increasing the data amount each time.

  In the above-described embodiment, upon receiving the request transmission message DM1 from the transmission-side message management unit 101, the transmission-side message management unit 102 inquires the transmission timing management unit 104 about the current timing, and requests from the own layer. Although it is determined whether or not the transmission timing of the message B is not, the transmission timing management unit 104 may notify the transmission side message management unit 102 whether or not it is the transmission timing of the message B. The same applies to the transmission-side message management unit 103, and the transmission timing management unit 104 may notify the transmission-side message management unit 103 whether or not it is the transmission timing of the request message C. In the present embodiment, it is needless to say that whether or not the current timing is the transmission timing of the request message B or the request message C is determined by determining a certain range with respect to the transmission timing. .

In the above-described embodiment, the transmission-side message management unit on the transmission device 100 side and the reception-side message management unit on the reception device 200 have a three-layer structure, but the number of layers (communication layer) may be further increased. . Also, a two-layer structure may be used, and communication between the transmission device 100 and the reception device 200 may be either a wired or wireless communication method .

[Two-layer communication system]
FIG. 27 shows a functional block diagram of a communication system according to the present invention when the communication hierarchy is two layers. In the communication system having two communication layers, the transmission device 100 transmits a request message A having a cycle T1 (1 minute) as a transmission cycle, and a transmission side message management unit 100A and a cycle T2 (3 minutes). A transmission-side message management unit 100B that manages the request message B as a cycle, a transmission timing management unit 100C that manages the transmission timing of the request message A and the transmission timing of the request message B, and the reception device 200 A request message transmission unit 100D that transmits the request transmission message DM and a response message reception unit 100E that receives the response transmission message AM from the reception device 200 are provided.

  In addition, the receiving device 200 includes a receiving-side message management unit 200A that manages the request message A sent from the sending device 100, and a receiving-side message management unit 200B that manages the request message B sent from the sending device 100. A request message receiving unit 200C that receives the request transmission message DM from the transmission device 100, and a response message transmission unit 200D that transmits the response transmission message AM to the transmission device 100.

  In the transmission device 100, the transmission-side message management unit 100A receives the instruction of the transmission timing of the request message A from the transmission timing management unit 100C, generates a request transmission message DM1 including the request message A, and generates the generated request transmission. A request message notification unit 100A1 that notifies the message DM1 to the transmission side message management unit 100B. The transmission side message management unit 100B receives the request transmission message DM1 including the request message A from the transmission side message management unit 100A. It is confirmed whether or not the current timing is the transmission timing of the request message B. If it is the transmission timing of the request message B, the request message B is included in the request transmission message DM1 including the request message A. Include B And a request message notification unit 100B1 for notifying the transmission message DM2 to the request message transmitting unit 100D. In this case, the request message transmission unit 100D transmits the request transmission message DM2 including the request message A and the request message B from the transmission-side message management unit 100B to the reception device 200 as the request transmission message DM.

  In the receiving device 200, the request message receiving unit 200C receives the request transmission message DM transmitted from the transmission device 100, and notifies the reception side message management unit 200B of the received request transmission message DM as the request transmission message DM2. . The message management unit 200B on the receiving side checks whether or not the request message B is included in the transmission request message DM2 notified from the request message reception unit 200C. If the request message B is included, the request message B And a request message extraction unit 200B1 for notifying the reception side message management unit 200A of the transmission request message from which the request message B has been extracted as a transmission request message DM1. The receiving-side message management unit 200A checks whether the request message A is included in the request transmission message DM1 notified from the receiving-side message management unit 200B. If the request message A is included, the request message A A request message extracting unit 200A1 for extracting A is included.

  In the receiving device 200, when the request message extraction unit 200A1 extracts the request message A from the request transmission message DM1, the reception-side message management unit 200A generates a response transmission message AM1 including the response message A for the request message A. Then, when the response message notifying unit 200A2 for notifying the generated response transmission message AM1 to the receiving side message management unit 200B and the request message extracting unit 200B1 extract the request message B from the request transmission message DM2, the request message B The response message B is included in the response transmission message AM1 notified from the receiving-side message management unit 200A, and the response message including the response message B is set as the response transmission message AM2. And a response message notifying unit 200B2 of notifying the di transmission unit 200D. In this case, the response message transmission unit 200D transmits the response transmission message AM2 including the response message A and the response message B from the reception-side message management unit 200B as the response transmission message AM to the transmission device 100.

  In the transmission device 100, the response message receiving unit 100E receives the response transmission message AM transmitted from the reception device 200, and notifies the transmission side message management unit 100B of the received response transmission message AM as the response transmission message AM2. . The transmission-side message management unit 100B checks whether or not the response message B is included in the response transmission message AM2 notified from the response message reception unit 100E. If the response message B is included, the response message B And a response message extraction unit 100B2 that notifies the transmission message management unit 100A of the response transmission message from which the response message B has been extracted as a response transmission message AM1. The transmission-side message management unit 100A checks whether or not the response message A is included in the response transmission message AM1 notified from the transmission-side message management unit 100B. If the response message A is included, the response message A A response message extracting unit 100A2 for extracting A is included.

  The communication system of the present invention can be used in various fields such as a medium-scale and large-scale monitoring control system having a mesh structure in which a communication trunk line is wireless. Specifically, it can be applied to a room air conditioning system by VAV (variable air volume adjustment).

  DESCRIPTION OF SYMBOLS 100 ... Transmission device, 101 ... 1st transmission side message management part, 102 ... 2nd transmission side message management part, 103 ... 3rd transmission side message management part, 104 ... Transmission timing management part, 105 ... Request message transmission 106, response message receiving unit, 200 ... receiving device, 201 ... first receiving side message managing unit, 202 ... second receiving side message managing unit, 203 ... third receiving side message managing unit, 204 ... request Message receiving unit 205 ... Response message transmitting unit 100A, 100B ... Sending message management unit 100C ... Transmission timing management unit 100D ... Request message transmitting unit 100E ... Response message receiving unit 100A1, 100B1 ... Request message notification unit , 100A2, 100B2... Response message extraction unit, 200A, 2 0B ... recipient message management unit, 200C ... request message receiving unit, 100D ... response message sending unit, 200A1,200B1 ... response message extraction portion, 200A2,200B2 ... response message notifier.

Claims (5)

In a communication system including a transmitting device and a receiving device that receives a message periodically transmitted from the transmitting device,
The transmitting device is
First sending message management means for managing a first message having a first period as a transmission period;
Second transmitting-side message management means for managing a second message whose transmission period is a second period that is an integral multiple of the first period;
Transmission timing management means for managing the transmission timing of the first message and the transmission timing of the second message in a aligned state;
Message sending means for sending a message to the receiving device ;
Response message receiving means for receiving a response message from the receiving device,
The receiving device is
First receiving message management means for managing the first message sent from the transmitting device;
Second receiving message management means for managing the second message sent from the transmitting device;
Message receiving means for receiving a message sent from the transmitting device;
Response message transmission means for returning a response message to the message sent from the transmission device,
The first sender message management means includes:
In response to the transmission timing instruction of the first message from the transmission timing management means, a transmission message including the first message is generated, and the generated transmission message is sent to the second transmission side message management means. A first transmission message notification means for notifying,
The second sender message management means includes:
Upon receiving a notification of a transmission message including the first message from the first transmission side message management means, it is confirmed whether the current timing is the transmission timing of the second message, and the second message The second message is included in the transmission message including the notified first message, and the message transmission unit is notified of the transmission message including the second message. 2 transmission message notification means,
The message transmission means includes:
Transmitting the transmission message notified from the second transmission-side message management means to the reception device ;
The message receiving means includes
Receiving the transmission message sent from the transmission device and notifying the second receiving message management means,
The second receiving side message management means includes:
It is confirmed whether or not the second message is included in the transmission message notified from the message receiving means. If the second message is included, the second message is taken out and the second message is extracted. A first message management unit that notifies the first message management means of the transmission message from which
The first receiving side message management means includes:
It is confirmed whether or not the first message is included in the transmission message notified from the second receiver-side message management means. If the first message is included, the first message is extracted. ,
further,
The first receiving side message management means includes:
When the first message is included in the transmission message notified from the second reception-side message management means, a response transmission message including a first response message for the first message is generated and generated The received response transmission message to the second receiver message management means,
The second receiving side message management means includes:
When the second message is included in the transmission message notified from the message receiving means, the second response message for the second message is transmitted as a response transmitted from the first receiving message management means. A response transmission message included in the message and including the second response message is notified to the response message transmission means;
The response message transmission means includes
Transmitting a response transmission message notified from the second reception-side message management means to the transmission device;
The response message receiving means includes
Receiving the response sending message sent from the receiving device and notifying the second sending message management means;
The second sender message management means includes:
It is confirmed whether or not the second response message is included in the response transmission message notified from the response message receiving means, and if the second response message is included, the second response message is extracted. And notifying the first transmission message management means of the response transmission message obtained by extracting the second response message,
The first sender message management means includes:
It is confirmed whether or not the first response message is included in the response transmission message notified from the second transmission-side message management means, and if the first response message is included, the first response message A communication system characterized by extracting a response message . The communication system according to claim 1,
The second transmission message notification means includes:
If the timing when the transmission message including the first message is received from the first transmission message management means is not the transmission timing of the second message, the notified first message is A transmission system including the transmission message including the message transmission unit as it is. In the communication system according to claim 1 or 2,
The first transmission message notification means includes:
Adding destination information indicating a transmission destination of the transmission message to a transmission message including the first message to be notified to the second transmission-side message management unit;
The second transmission message notification means includes:
The timing when receiving the notification of the transmission message including the first message from the first transmission message management means is the transmission timing of the second message, and includes the notified first message When the transmission destination of the transmission message matches the transmission destination of the second message, the transmission message including the notified first message includes the second message, and the second message is included. A communication system characterized by notifying the message transmission means of the transmitted message. In the communication system according to any one of claims 1 to 3,
The first receiving side message management means includes:
If the first message is not included in the transmission message notified from the second receiving message management means, a response transmission message not including the first response message is generated, and the generated response transmission is generated. Notifying the second receiver message management means of a message;
The second receiving side message management means includes:
When the second message is not included in the transmission message notified from the message receiving means, the response transmission message notified from the first receiving message management means is notified to the response message transmitting means as it is. A communication system characterized by the above. In the communication system according to any one of claims 1 to 4 ,
A plurality of layers of transmission-side message management means are provided between the first transmission-side message management means and the message transmission means.
Corresponding to the transmission side message management means between the first transmission side message management means and the message transmission means between the first reception side message management means and the message reception means, the second A communication system comprising a plurality of layers of receiving-side message management means different in messages managed by the same configuration as the receiving-side message management means .

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