JP2009055298A - Specific low-power radio telemeter system - Google Patents

Abstract

[PROBLEMS] To improve a communication method between a wireless slave unit or a repeater and a meter by devising a transmission message to be communicated next even in a meter that does not immediately update even when a set message is received. A radio telemeter system that solves the problem and can be easily introduced is provided.
A wireless slave or relay monitors only a processing type part of a received message. Even if the setting message is received, the setting of the important items is not immediately updated and the transmission processing to the meter that requests the setting message twice is set as, for example, the processing type “Two”, and the message “00000TwoA1011111” including it is Assume that the repeater receives it. The wireless slave unit or repeater creates an ID setting message in the official format with only “Two” removed and sends it to the meter. Next, when a response message is received from the meter, the same message “00000A1011111” is further sent to the meter. Since it is retransmitted, the meter is updated even if important information is set.
[Selection] Figure 6

Description

  The present invention is based on the standard RCR STD-T67, which allows easy introduction without changing the specifications and models of the center network control device, terminal network control device and meter used in the wired telemeter system. The present invention relates to an equivalent radio telemeter system.

  Conventionally, a wireless telemeter system includes a terminal network control device connected to a center network control device via a telephone network, a wireless master device wired to the terminal network control device, and a wireless slave device or a wireless device for expanding a wireless area. It consists of a repeater that relays wireless data between the master unit and the wireless slave unit, and a meter such as gas and water that is wired to the wireless slave unit or relay unit. Alternatively, a wireless communication of a specific low power wireless system is performed between the wireless master device and the relay device and between the relay device and the slave device. In the wireless telemeter system, wireless terminals such as a master unit, a repeater, and a slave unit are added between the terminal network control device and the meter as compared with the conventional wired telemeter system. The communication time is remarkably increased due to a transmission delay or the like, and may be several times between the center and the meter.

  On the other hand, in the telemeter system, in order to enable quick recovery when an abnormality is detected, there is often a restriction on the standby time of communication, and the restriction is center network control device, terminal network control device, And meters are also generally provided.

  When a wireless communication part is introduced into a telemeter system, the communication time increases, and thus any one of the center network control device, the terminal network control device, and the meter exceeds the standby time limit, and it is often difficult to continue communication. In order to enable continuous communication and stabilize the system, a predetermined message is inserted as a dummy message between the original communication messages, and the dummy message is transmitted between the center network controller and the wireless master unit. A method is employed in which communication between a repeater or a wireless slave and a meter is not performed so that standby time restriction processing does not occur (Patent Document 1).

  On the other hand, depending on the type of meter, even if a setting message for setting items to be set is received, the setting contents are not updated immediately.If the next message expected by the meter can be received, the setting contents will be updated. There are some that do, and discard settings if not expected.

When a conventional wireless telemeter system is introduced in a meter that does not immediately update even when the above setting message is received, the received message next to the setting message is almost always a dummy message. Since the meter does not have the expected message, the setting is not possible in the meter that has received the setting message, and eventually, the introduction of the system was abandoned.
Japanese Patent Laid-Open No. 9-8932

  Therefore, even if the wireless telemeter system receives a setting message that the meter should update a setting item such as an important item, even if it is of a type that does not immediately update the setting item, the following message There is a problem to be solved in terms of improving the communication form such as the message format and the communication timing between the wireless slave unit or the relay unit and the meter so that the setting item is updated.

  The present invention allows the next communication between the wireless slave unit or the relay unit and the meter even in the meter that does not immediately update the setting item even if the setting message that the setting item should be updated is received. It is to provide a wireless telemeter system that can be easily introduced by solving the conventional problems by devising the format of the message to be transmitted and the communication time.

  In order to solve the above-described problems and achieve the object, the wireless telemeter system according to the present invention is configured such that the wireless slave unit or the relay unit processes the number of communication between the meter and the means for processing the message transmitted to the meter by the message from the wireless master unit. Specifically, the wireless slave device or the relay device that has received one message from the wireless master device has created and created a transmission message from the received message to the meter. It communicates with the meter twice with the transmission message.

  According to this wireless telemeter system, because it is configured as described above, even if the meter that received the first setting message instructing the change of the setting item is a meter that does not immediately update the setting item, In the second transmission, a transmission message with a content to instruct setting change is sent to the meter, so the setting is updated in the meter that has received the transmission.

  This wireless telemeter system can have means for storing a message processing type. Furthermore, when the wireless slave unit or the relay unit communicates with the meter twice with one message from the wireless master unit, a means for returning to the wireless master unit using a response message from only one of the meters is provided. Can have. Furthermore, the timing to send a reply to the wireless master unit can include means for making a selection with a message from the first or second response message from the meter.

  Further, in this wireless telemeter system, the slave unit or the repeater has a function of changing the communication message between the means for storing the communication message to the meter and the stored meter, so that the wireless telemeter system can be easily introduced. Is to encourage.

  According to this wireless telemeter system configured as described above, even if a meter that does not immediately update the setting when a setting message of an important item is received as a transmission message is connected to the wireless slave unit or the relay unit The important setting for the meter can be updated by the second transmission message. Further, the same effect can be obtained without adding a processing load in new operation to the center network control device. In addition, since the wireless master device can perform the same processing as the conventional method, it is possible to reduce a decrease in system efficiency. In addition, since the wireless slave device or the relay device can change the return timing to the wireless master device, it is possible to further prevent a reduction in system efficiency. Furthermore, the types of meters that can be handled will increase. Furthermore, since the introduction range can be further expanded, the wireless telemeter system can be easily introduced.

  As shown in FIG. 1, the radio telemeter system includes a center network control device 2 connected to a host computer (hereinafter abbreviated as “host”) 1 and a radio network connected to a terminal network control device 4 via a telephone line 3. A machine (hereinafter referred to as “master unit”) 5 and an electric, gas, and water meter 8 connected to an unrelated slave unit (hereinafter referred to as “slave unit”) 6 or a relay unit 7, Data communication is performed wirelessly between the master unit 5 and the slave unit 6 or the relay unit 7.

  FIG. 2 is a block diagram of the master unit 5 and the slave unit 6 or the relay unit 7. The master unit 5 and the slave unit 6 or the relay unit 7 include a non-volatile memory 17 or 25 used for registration of an identification code or the like. The CPU 12 and the CPU 20 have a clock function and a timer function.

  First, referring to the sequence diagram shown in FIG. 3, the operation of setting the meter 8 by the conventional center network control device 2 will be described. The center network control device 2 transmits an activation message to the parent device 5 via the terminal network control device 4 in order to set the meter 8, and when there is a response from the parent device 5, the center network control device 2 An activation request for prompting activation of the meter 8 is transmitted to the slave unit 6 to which the meter 8 is connected. Receiving the activation request message from the center network control device 2 to the meter 8, the parent device 5 changes the wired data to wireless data, and wirelessly transmits the activation request message to the child device 6 to which the target meter 8 is connected. . The handset 6 that has received the start request from the base unit 5 to the meter 8 converts wireless data into wired data, and transmits a start message to the meter 8 based on the converted data.

  Thereafter, the slave unit 6 that has received the response message from the meter 8 wirelessly transmits the response message to the master unit 5 in the reverse procedure, but the meter 8 times out until the next message from the master unit 5 can be received, that is, Then, a retransmission request message is transmitted to the meter 8 at regular time intervals so that the communication is not interrupted due to exceeding the standby time limit. Further, the slave unit 6 that has made a start request to the meter 8 determines that all messages received before receiving the end message from the master unit 5 are communication messages to the meter 8, and the message contents are monitored. (Hereinafter, a state in which a telegram message received by the slave unit 6 or the relay unit 7 without being monitored is referred to as a “transmission mode”). On the other hand, when the response message from the meter 8 is received from the slave unit 6 to the master unit 5, the master unit 5 converts the received data into wired data and transmits it to the center network control device 2.

  As described above, in the conventional method, in order to continue communication between the slave unit 6 or the relay unit 7 and the meter 8, an operation is performed to communicate a retransmission request message at an interval at which the meter 8 does not time out. By the way, in the meter 8, even if a setting message is received, if the setting item is an important item such as ID setting, there is one that does not immediately update the setting. For example, it is assumed that the meter 8 receives a message for changing the ID “00000” to “11111”. The meter 8 does not immediately update the ID to “11111” and returns a response message, but if the next received message is not what the meter 8 expects, it returns a response message, The ID setting prepared by the message is discarded, and if it is expected, the response message is returned and the ID is updated to “11111”. This is because the meter 8 enhances security against important setting data changes.

  Here, since the retransmission request message is a message composed only of the character data “B” as shown in FIG. 4, the ID part and the like are omitted as compared with the general message format shown in FIG. 5, and the security is poor. . Such a retransmission request message does not correspond to an expected message for updating the setting in the meter 8, and a normal message received in the message format shown in FIG. 5 is generally a conditional message for updating the setting. . That is, in the conventional method shown in FIG. 3, even if the meter 8 receives the setting message, the next received message is a retransmission request message composed only of the character data “B”, so the ID to “11111” There was a case where it was not renewed and the introduction of the wireless telemeter system was abandoned.

  Note that the format shown in FIG. 5 is a message format of a general telemeter system, and a code indicating a target terminal such as the parent device 5, the child device 6, the relay device 7, and the meter 8 is included in the ID portion. A code indicating a request or response process to the target terminal is entered in the part, and data necessary for the request or response process is entered in the process data part. Here, the data length of the ID and the processing type portion is fixed, and the processing data portion is variable length because it differs depending on the processing content. For example, if the process type for setting the ID to the meter 8 is “A10”, the ID setting message is “00000A1011111”.

The operation of the wireless telemeter system will be described with reference to FIG. 6 which is a sequence diagram.
The slave unit 6 or the relay unit 7 monitors only the processing type part of the received message even if the message from the master unit 5 is a message in the transparent mode. Even if the setting message is received, the transmission process to the meter 8 that does not immediately update the setting of the important item is assumed to be, for example, the processing type “Two” and the message “00000TwoA1011111” including it is received by the slave unit 6 or the relay unit 7 To do.

  Based on the message from the parent device 5, the slave device 6 or the relay device 7 creates an ID setting message that is “00000A1011111” from which only “Two” has been removed, and transmits the created message to the meter 8, and then transmits the created message to the meter 8. When the response message is received from 8, the same message “00000A1011111” is retransmitted to the meter 8. In this way, after receiving the ID setting message for the meter 8, the next received message will receive a normal message in the format shown in FIG. Will be. Note that when the slave unit 6 or the relay unit 7 receives the conventional “00000A1011111” during the transmission mode, the conventional process is performed.

In addition, the operation of the radio telemeter system according to the present invention will be described with reference to the flowchart shown in FIG.
The slave unit 6 or the relay unit 7 stores a predetermined process type, monitors only the process type part of the message even in the transparent mode, and compares the stored process type with the process type of the received message. . For example, it is assumed that the slave unit 6 or the relay unit 7 stores “A10” in advance and receives a message “00000A1011111” from the base unit 5 (step 701; abbreviated as “S701”, the same applies hereinafter). In step S702, it is determined whether the received message processing type matches the processing type stored in advance. In this example, since “A10” matches, the process proceeds to S703, and two communication processes (S704 to S706) are performed for the meter 8.

  On the other hand, if the stored processing type is different from the processing type of the received message, the process proceeds to S707 in the determination of S702, and one communication process is performed on the meter 8. This requires a means for storing the processing type in the slave unit 6 or the relay unit 7 (for example, the data registration nonvolatile memory 25 in FIG. 2B). Since the same message can be transmitted regardless of the type, there is no need to manage the type of the meter 8, and the system load can be reduced compared to the previous example.

  From the above description, the present wireless telemeter system is characterized in that even if the message received from the parent device 5 by the child device 6 or the relay device 7 is a single message, the meter 8 performs two communication processes. However, the reply message to the base unit 5 can be prevented from lowering the processing efficiency of the base unit 5 and the center network control device 2 if it can be the same as the conventional method of performing the communication process once for the meter 8. it can. Therefore, in the radio telemeter system, when the slave unit 6 or the relay unit 7 performs the communication process twice to the meter 8, either one of the response messages from the meter 8 received twice can be discarded. .

  By the way, some types of meters 8 are different as response messages even if the same setting message is received. This is because the meter 8 sets “response before setting information update” for the first setting message and “response after setting information update (update completion)” for the second setting message. is there. In other words, for this type of meter 8, in FIG. 6, the response to the first transmission process indicates that it is not updated, and is discarded, and only the update completion response is returned to the base unit 5. become.

  On the other hand, there is a meter 8 in which the same response message is returned for the same setting message or a system that does not require confirmation of the response message. Therefore, in the wireless telemeter system, as shown in FIG. 8, the transmission process to the meter 8 in which the important item is not immediately updated even when the slave unit 6 or the relay unit 7 receives the setting message is processed, for example, by the processing type “TwF ”And a message“ 00000TwFA1011111 ”including it is transmitted,“ 00000A1011111 ”from which only“ TwF ”has been removed is transmitted to the meter 8, and the response message from the meter 8 is directed to the base unit 5. Send back. After that, the slave unit 6 or the relay unit 7 that has received the message of the processing type “TwF” transmits the same message “00000A1011111” to the meter 8 again, but the master unit 5 sends back to the center network control device 2 Therefore, the response can be improved as a whole system.

Next, description will be given with reference to FIG.
Furthermore, some meters 8 do not immediately update even when a setting message of an important setting item is received, but update when the next received message is not the previous setting message. The cordless handset 6 stores in advance a telegram (specific telegram) to the meter 8. For example, it is assumed that a message “00000B10” that requests reading of ID information of a meter is stored as a specific message.

  When the handset 6 receives a message such as “00000TwoA1011111” that can be determined to communicate twice with the meter 8, it transmits a message “00000A1011111” excluding “Two” to the meter 8 based on the received message. In addition, the message of the response 1 from the meter 8 is stored, and the stored specific message “00000B10” is transmitted to the meter 8. The handset 6 that has received the response 2 message from the meter 8 can respond by returning it to the parent device 5 as a single message combined with the immediately preceding response message (response 1 message).

  Furthermore, since the value of the specific message “00000B10” stored in advance in the child device 6 as described above is fixed, in this example, only the meter whose ID is 00000 can be handled. For example, the meter 8 having ID 22222 is processed as an abnormal message. Since this state does not occur, there is a need to check the ID in advance with a read message of the ID of the meter 8 and store the message corresponding to the ID in the slave unit 6 or the relay unit 7 in advance.

Therefore, FIG. 10 shows the operation when the ID of the meter 8 is 2222.
When the child device 6 receives “22222TwoA103333” from the parent device 5, the child device 6 creates a message “22222A1033333” from which “Two” is removed based on the received message, communicates with the meter 8, and stores the specified message If “00000B10” is changed to the value of the ID part of the created message and changed to “22222B10” to communicate with the meter 8, the adaptive range can be expanded to the target meter 8 without requiring complicated processing.

1 is a system diagram of a wireless telemeter system according to an embodiment of the present invention. It is a block diagram of the main | base station, the subunit | mobile_unit, and a relay machine concerning embodiment of this invention. It is a sequence diagram in a conventional radio telemeter system. It is a message format that encourages retransmission. This is a general message format. It is a sequence diagram concerning the embodiment of the present invention. It is a flowchart concerning embodiment of this invention. It is a sequence diagram concerning the embodiment of the present invention. It is a sequence diagram concerning the embodiment of the present invention. It is a sequence diagram concerning the embodiment of the present invention.

Explanation of symbols

1 Host 2 Center Network Controller 3 Telephone Line 4 Terminal Network Controller 5 Master Unit 6 Slave Unit 7 Relay Unit 8 Meter 10 Antenna 11 Wireless Communication Unit 12 CPU 13 I / F for Connection with Terminal Network Controller
14 ROM 15 RAM
16 Battery 17 Non-volatile memory for data registration 18 Antenna 19 Wireless communication unit 20 CPU 21 I / F for connection with meter and sensor
22 ROM 23 RAM
24 battery 25 non-volatile memory for data registration

Claims (6)

A terminal network control device connected to the center network control device via a telephone network; a wireless master device wired to the terminal network control device; and a wireless slave device or a wireless master device and a wireless slave device for wireless area expansion It is composed of a relay device that relays wireless data between, and the wireless slave device or a meter connected to the relay device, such as gas and water, wired between the wireless master device and the wireless slave device, or the In a wireless telemeter system that performs wireless communication of a specific low power wireless system between a wireless master device and the relay device and between the relay device and the slave device,
The wireless slave device or the relay device creates a transmission message to the meter based on one message received from the wireless master device and communicates with the meter twice with the created transmission message. Wireless telemeter system.   The wireless slave device or relay device stores in advance several processing types indicating the processing contents of the meter, and the stored processing type matches the processing type in the message from the wireless master device. 2. The radio telemeter system according to claim 1, wherein the transmission telegram is created according to the situation.   The wireless slave device or the relay device creates the reply message based on a response from the meter to either one of the two communications with the meter. 2. The radio telemeter system according to 2.   The wireless slave device or the relay device returns a response to the wireless master device based on a response from the meter based on the meter response to the first communication or the meter response to the second communication. 4. The radio telemeter system according to claim 3, wherein whether the response is based on a response is selected according to the content of the message from the radio master unit.   The wireless slave device or the relay device stores in advance a specific message to the meter, and after the first communication to the meter with the transmission message based on the message from the wireless master device, 2. The radio telemeter system according to claim 1, wherein the second telegram is communicated to the meter by the stored specific telegram.   The wireless slave device or the relay device stores in advance a specific message to the meter, and after the first communication to the meter with the transmission message based on the message from the wireless master device, 2. The wireless communication according to claim 1, wherein the stored specific electronic message is changed based on the electronic message from the wireless master device, and a second communication with the meter is performed using the changed specific electronic message. Telemeter system.

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