JP2007235224A - Telemeter system and information gathering method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a telemeter system capable of gathering information in a shorter time than in a conventional system when the number of slave stations is large and efficiently transmitting the information, and to provide an information gathering method. <P>SOLUTION: The system comprises a master station 10 and slave stations 20-1 to 20-n which use a radio communication circuit of a predetermined frequency in time division multiplex. The master station 10 is provided with an information requesting section 15 for broadcasting time slot information indicating a time slot used for returning the information gathered together with request information of information gathering for each of a plurality of slave stations, to the plurality of slave stations. The slave stations 20-1 to 20-n are each provided with a transmission control section 25 which arranges gathered information to a time slot corresponding to arrived time slot information when receiving the request information destined to its own station and transmits the information. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a telemeter system composed of a master station and a slave station using a radio link of a predetermined frequency by time division multiplexing, and an information collecting method applied to this system.

  In a conventional telemeter system, a call is individually made from a master station to a plurality of slave stations using a downlink signal of a predetermined frequency, and each slave station transmits collection information using an uplink signal different from the predetermined frequency. A polling / selecting method was used.

An example of the polling / selecting method will be described. As shown in FIG. 7, when the call signal S1 is sent from the master station P to the slave station C1, the slave station C1 responds with a response signal R1 including collected information. Then, when the call signal S2 is sent from the master station P to the slave station C2, the slave station C2 returns a response signal R2 including the collected information in response to the call signal S3. Is sent to the slave station C3, the slave station C3 returns a response signal R3 including the collected information in response to this, and so on. Similarly, when the call signal Sn is sent from the master station P to the slave station Cn, In response to this, the slave station Cn returns a response signal Rn including the collected information.

  As described above, the call and response are paired, and it is necessary to make a call for each slave station, and a response is made by assigning a channel to each slave station, which is wasteful, Especially when the number of slave stations increased, it took time.

On the other hand, Patent Document 1 discloses a system for changing the setting of the polling cycle in order to improve the efficiency of data collection. In the invention described in Patent Document 1, although the polling period is changed, there is an advantage that information can be collected in a short period from a slave station with a large amount of collected information. The time required for collecting information from the station cannot be shortened.
JP 2000-267892 A

  The problem to be solved by the present invention is that it takes a lot of time to collect information when the number of slave stations is large. In the present invention, even when there are many slave stations, information is not required as much as before. It is an object of the present invention to provide a telemeter system and an information collecting method capable of collecting and efficiently transmitting information.

  The telemeter system according to the present invention is a telemeter system composed of a master station and a slave station that uses a radio channel of a predetermined frequency by time division multiplexing. The master station includes information requesting information collection for each of the slave stations. An information requesting unit for sending time slot information indicating the time slot to be returned for the collected information to the plurality of slave stations at once is provided, and when the request information addressed to the own station is received in the plurality of slave stations, A transmission control unit that arranges and transmits the collected information to the corresponding time slot according to the time slot information that has arrived is provided.

    In the telemeter system according to the present invention, the information request unit transmits information indicating different time slots of the same channel as time slot information.

    In the telemeter system according to the present invention, the information requesting unit transmits information indicating a frame and a channel in the frame, and information on a head time slot and a time slot width for setting information in the channel as time slot information. It is characterized by that.

    An information collecting method according to the present invention is an information collecting method applied to a telemeter system composed of a master station and a slave station that uses a radio channel of a predetermined frequency by time division multiplexing. The time slot information indicating the time slot to be returned for the collected information together with the information collection request information for each is sent to a plurality of slave stations at the same time, and the plurality of slave stations receive the request information addressed to the local station and arrive. The collected information is arranged and transmitted to the corresponding time slot according to the time slot information.

  The information collection method according to the present invention is characterized in that information indicating different time slots of the same channel is transmitted as the time slot information.

  The information collection method according to the present invention is characterized in that as the time slot information, information indicating a frame and a channel in the frame, and information on a head time slot and a time slot width for setting information in the channel are transmitted. To do.

  In the present invention, the master station simultaneously transmits to the plurality of slave stations time slot information indicating the time slots to be returned for the information collected together with the information collection request information for each of the plurality of slave stations. Then, the request information addressed to the local station is received, and the collected information is arranged and transmitted to the corresponding time slot according to the time slot information that has arrived. A request for collection can be sent, an efficient call can be made, and information can be arranged in a designated time slot to ensure efficient transmission.

  In the present invention, the time is shortened compared with the case where calls are made to individual slave stations by simultaneous calls to a plurality of slave stations, and time slots are efficiently operated by indicating the time slots to be returned. In the case where there are a large number of stations, the purpose of collecting information can be achieved without requiring the time as before, and the purpose of efficiently transmitting information is also achieved.

  Embodiments of a telemeter system and an information collection method according to the present invention will be described below with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference numerals and redundant description is omitted. FIG. 1 shows a configuration diagram of a telemeter system according to the present invention. This telemeter system has a master station 10 and a plurality of slave stations 20-1, 20-2,..., 20-n. In the telemeter system including the master station 10 and the slave stations 20-1, 20-2,..., 20-n, a radio line having a predetermined frequency is used by time division multiplexing. The master station 10 includes a management device 11 including a workstation and a personal computer, a wireless device 12, a display device 13 such as an LCD and a CRT, and an operation unit 14 such as a keyboard and a mouse. .

  The CPU of the management apparatus 11 includes an information request unit 15 and an information collection analysis unit 16. The information request unit 15 sends time slot information indicating a time slot for returning information collected together with information collection request information for each of a plurality (not necessarily n) of slave stations simultaneously to the plurality of slave stations. is there. The information collecting / analyzing unit 16 captures information transmitted from the slave stations 20-1, 20-2,..., 20-n via the wireless device 12 and compares the information with a predetermined threshold value. Analyze to issue warnings. The analysis result is displayed on the display 13.

  On the other hand, since the slave stations 20-1, 20-2,..., 20-n have basically the same configuration, the slave station 20-1 will be described. 22-m and a control unit 23 constituted by a processor. The control unit 23 includes a reception processing unit 24, a transmission processing unit 25, and a data collection unit 26. The reception processing unit 24 determines whether the information is acquired from the radio device 21 and transmitted to the own station, and the transmission processing unit 25 responds according to the time slot information that has arrived. The control is performed to arrange and transmit the collection information to the slot, and the data collection unit 26 collects data from the sensors 22-1 to 22-m at a predetermined timing and accumulates it when necessary. A process of passing to the transmission control unit 25 at the time of transmission is performed. As the types of the sensors 22-1 to 22-m, a thermometer, a rain gauge, an anemometer, a seismic intensity meter, a snow cover, and the like are provided as necessary.

  In the telemeter system configured as described above, for example, a telemeter system digital line in a prefectural disaster prevention digital integrated communication system is used. In this digital line, as shown in FIG. 2, four channels are multiplexed as one frame on the same frequency. In the master station 10, the CPU of the management apparatus 11 functions as the information request unit 15 by executing a program corresponding to the flowchart shown in FIG. 3, and information is acquired by executing the program corresponding to the flowchart shown in FIG. It functions as the collection analysis unit 16. On the other hand, the control unit 23 that is a processor in the slave stations 20-1, 20-2,..., 20-n executes a program corresponding to the flowchart shown in FIG. 25, functions as the data collection unit 26. The operation of the system will be described below based on the flowcharts of FIGS.

  As shown in FIG. 3, the CPU of the management apparatus 11 in the master station 10 detects whether it is time to collect information due to a timer interrupt or a command input from the operation unit 14 (S11). When it is time to collect information by timer interruption or command input, destination information consisting of a plurality of slave stations set in advance or input from the operation unit 14 and the type information of information to be collected by each slave station are transmitted. Along with aligning as information (S12), the amount of collected information returned from each slave station (for example, the number of bytes) is obtained, a return time slot is assigned, and a time slot indicating the time slot for returning the collected information is indicated. Slot information is generated, and the destination information, the type information of information to be collected by each slave station, and time slot information are set and transmitted using a predetermined channel (for example, channel CH1) (S13). . As the time slot information, information indicating a channel, information on a first slot (for example, the Nth word) and slot width (for example, M words) in which collection information is set in the channel are specified. In addition, it is assumed that different time slots in the same channel are specified for a plurality of slave stations to improve transmission efficiency. Further, when different time slots in the same channel are designated, it is preferable to arrange a guard slot in which no data is set between pieces of information for each slave station in order to easily identify information of adjacent slave stations.

  On the other hand, each slave station 20-1, 20-2,..., 20-n waits for collection request information to be sent from the master station 10 as shown in FIG. S21) When the collection request information arrives, it is detected whether the information is addressed to the own station (S22). If it is detected that the information is addressed to the own station, the type of information to be collected by the slave station Information and time slot information are extracted (S23), and necessary information is prepared corresponding to the information and time slot instructions are transmitted to the radio device 21 (S24).

  On the other hand, the CPU of the management apparatus 11 in the master station 10 is waiting for the arrival of the collected information as shown in FIG. 5 (S31). It is detected what kind of information is sent, the information is analyzed (S32), and the result is displayed on the display 13 (S33).

  By such processing, for example, as shown in FIG. 6, destination information from the master station 10 to the slave stations 20-1 to 20-8 in the channel CH1 of the frame F1, and the type information of information to be collected by each slave station And time slot information are sent all at once. In this case, assuming that different time slots of the channel CH2 are designated for the slave stations 20-1 to 20-4 and different time slots of the channel CH3 are designated for the slave stations 20-5 to 20-8, the frame Information from the slave stations 20-1 to 20-4 is set in different time slots of the channel CH2 in F1 and sent to the master station 10, and from the slave stations 20-5 to 20-8 in different time slots of the channel CH3. Information is set and sent to the master station 10.

  Thereafter, the same processing is performed for the slave stations 20-9,..., 20-n, and information can be collected from a plurality of slave stations by one call, thereby reducing time and improving transmission efficiency. Can be planned. In the frame F2, since simultaneous calls are made only to the slave stations 20-1 to 20-4 and no information collection request is sent to the slave stations 20-5 to 20-8, the slave station 20- In the example, information from 1 to 20-4 is sent to the master station 10 and information is not returned from the slave stations 20-5 to 20-8. In the example of FIG. 6, the information in which information of four slave stations is multiplexed and set in one channel is shown. However, the information is not particularly limited to four slave stations, and is less than three slave stations or more than five slave stations. Information may be multiplexed and set.

The block diagram which shows one Example of the telemeter system which concerns on this invention. The figure which shows the flame | frame structure in the radio | wireless line employ | adopted in one Example of the telemeter system which concerns on this invention. The flowchart for demonstrating the operation | movement which concerns on the information request | requirement of the main station in one Example of the telemeter system which concerns on this invention. The flowchart for demonstrating the operation | movement which concerns on the information return of the sub_station | mobile_unit in one Example of the telemeter system based on this invention. The flowchart for demonstrating the operation | movement which concerns on the information reception of a master station and analysis in one Example of the telemeter system which concerns on this invention. The figure which shows the communication procedure between the main | base station and a substation in one Example of the telemeter system which concerns on this invention. The figure which shows the communication procedure between the main | base station and a substation in the telemeter system which concerns on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Master station 11 Management apparatus 12 Radio | wireless machine 13 Display 14 Operation part 15 Information request part 16 Information collection analysis part 20-1-20-n Slave station 21 Radio | wireless machine 22-1-22-m Sensor 23 Control part 24 Reception process Unit 25 transmission processing unit 26 data collection unit

Claims (6)

In a telemeter system composed of a master station and a slave station using a radio link of a predetermined frequency by time division multiplexing,
The master station is provided with an information requesting unit that simultaneously sends time slot information indicating a time slot to be returned for information collected together with information collection request information for each of the plurality of slave stations to the plurality of slave stations,
The plurality of slave stations are provided with a transmission control unit that arranges and transmits the collected information to the corresponding time slot according to the time slot information that has arrived when request information addressed to the local station is received. A featured telemeter system. The telemetry system according to claim 1, wherein the information request unit transmits information indicating different time slots of the same channel as time slot information. The information request unit sends out information indicating a frame and a channel in the frame, and information on a head time slot and a time slot width for setting information in the channel as time slot information. Or the telemeter system of Claim 2. In an information collection method applied to a telemeter system composed of a master station and a slave station that uses a radio link of a predetermined frequency by time division multiplexing,
From the master station, the time slot information indicating the time slot to be returned for the information collected together with the information collection request information for each of the plurality of slave stations is simultaneously sent to the plurality of slave stations
The information collection method, wherein the plurality of slave stations receive request information addressed to the local station, and arrange and transmit the collected information to the corresponding time slot according to the arrived time slot information. 5. The information collecting method according to claim 4, wherein information indicating different time slots of the same channel is transmitted as the time slot information. 6. The time slot information is transmitted as information indicating a frame and a channel in the frame, and information on a first time slot and a time slot width in which information is set in the channel. Information collection method.

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