JP3528130B2 - Telemeter data transmission method and system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission system, and more particularly to a transmission control system for transmission data at different times. 2. Description of the Related Art Conventionally, in a data transmission system of this type, in a system in which one master station and a plurality of slave stations are connected by a bus-like network, the master station transmits telemeter data of each slave station. It is done for the purpose of collecting. FIG. 1 is a block diagram showing a configuration of a general telemeter system. Bus network 1
In addition, one master station 2 and a plurality of slave stations 3 are connected, and individual addresses are assigned to the master station 2 and the slave stations 3. Various data transmission methods have been applied to the telemeter system configured as described above. One example of such a data transmission method is a periodic transmission of telemeter data from the slave station 3 to the master station 2. A data transmission method is exemplified. This method is characterized in that no telemeter data transmission request from the master station 2 to the slave station 3, that is, polling is performed at all. However, in the prior art, data items whose necessity to be collected changes with time, such as rainfall data during the rainy season, are periodically transmitted even in a time when the necessity is low. Therefore, if the network to be connected is a pay-as-you-go network, there is a disadvantage that unnecessary costs are generated. The reason is that a method of transmitting only necessary data at a necessary time is not considered at all. An object of the present invention is to provide a data transmission system capable of collecting data with a minimum transmission amount. SUMMARY OF THE INVENTION [0007] The present invention relates to a method for collecting information in a master station.
A slave station for transmitting various telemeter data,
Transmission that executes transmission for each data item of telemeter data
Holds a first table describing the month and the current date and time
The internal clock, the transmission condition of the first table, and the internal
A date comparison unit for comparing the month indicated by the clock, and the date comparison unit
Data transmission for transmitting the matched data item to the master station
And a communication unit. [0010] Next, a first embodiment of the present invention will be described in detail with reference to the drawings. First of the present invention
This embodiment comprises a bus-like network 1, one master station 2, and a plurality of slave stations 3, as in the block diagram shown in FIG. As shown in FIG. 2, each slave station 3 compares a data transmission month setting table T1 storing the month of data transmission for each data item with time data set in the data transmission month setting table T1. Internal clock 4 used as
Date data comparing means 5 for periodically comparing these
And a data transmitting means 6 for transmitting data to the master station 2 when the comparison result satisfies the transmission condition, and a synchronizing signal detecting means for setting the synchronization of the internal clock 4 by a synchronizing signal from the master station 2 And 7. The data transmission month setting table T1 indicates that if there are n types of transmission data at the station,
As shown in FIG. 3, records R11 to R1 by transmission data
n. Further, information INF11 to INF1n in which the presence or absence of data transmission is summarized for each month is stored corresponding to each transmission data record R11 to R1n. Next, the operation of this embodiment will be described in detail with reference to FIG. In the slave station 3, when the transmission data to be transmitted from now on is set to the a-th item in all data items, the current date data (step A1) acquired from the internal clock 4 and the transmission in the data transmission month setting table T1 The monthly data transmission presence / absence information INF1a (step A2) stored in the data-specific record R1a is compared with the date data comparison means 5 (step A3), and if the transmission conditions match, the data transmission means 6 transmits the a-th item data. (Step A4). Next, effects of the present embodiment will be described. In the present embodiment, a data transmission month can be set for each item of transmission data, so that a wide range of transmissions can be performed when various data items having different importance depending on the season are transmitted from the slave station 3, and throughout the year. Lean data collection can be realized. Next, the operation of the present embodiment will be described using a concrete example. Now, when the total number of items of the transmission data is 5 in a certain slave station 3, monthly data transmission presence / absence information INF11 to INF15 are set in the data transmission month setting table T1 as shown in FIG. deep. Here, for example, if the current date data is January, and the second item data is to be transmitted at a fixed period, the data transmission time information I
Since the setting value of the NF 12 is from April to July, the periodic transmission of the second item data is not performed at all while the current date data is January. In the case of the above example, an annual time chart in which the transmission data of the first to fifth items can be actually transmitted is as shown in FIG. 6, and it is assumed that all data is continuously transmitted throughout the year. If so, the difference in the transmission amount is obvious. Next, a second embodiment of the present invention will be described in detail with reference to the drawings. Referring to FIG. 7, a second embodiment of the present invention includes, in addition to the configuration of slave station 3 in the first embodiment shown in FIG. It differs in having a transmission date setting table T2. The data transmission setting table T2 is divided into monthly records R201 to R212 as shown in FIG. Furthermore, information I that summarizes the presence or absence of data transmission on a daily basis
NF201 to INF212 are stored corresponding to the respective monthly records R201 to R212. Next, the operation of the present embodiment will be described in detail with reference to the drawings. Steps A1 and A2 in FIG.
Alternatively, the operations indicated by A4 of the date data comparing unit 5 and the data transmitting unit 6 according to the present embodiment are the same as the operations of the units 5 and 6 according to the first embodiment, and a description thereof will be omitted. In the first embodiment, data transmission is controlled based on month data in the current date data provided from the internal clock 4. In the present embodiment, the date data in the current date data is also included as a factor (step B).
1) The comparison is performed by the date data comparing means 5 (step B2). Next, effects of the present embodiment will be described. In the present embodiment, since the transmission conditions can be narrowed down to the day unit and compared, the presence / absence of data transmission can be switched even if the month does not change. Next, the operation of the present embodiment will be described using a concrete example. Now, a certain slave station 3 tries to transmit the third item of transmission data at a certain time on April 1 at a fixed period. The data transmission month setting table T1 and the data transmission date setting table T2 include data transmission presence / absence information INF13, INF20 for the third item in the form shown in FIG.
4 are set respectively. First, the set value of the data transmission month information INF13 is from March to October, and the condition of the month data is cleared.
Since it indicates 25 days, the comparison condition of the day data does not apply. Therefore, in this case, the third transmission data item is not transmitted. In other words, the third item of the transmission data is transmitted in April only on the 10th and the 25th. As described above, according to the present invention, the amount of packet communication throughout the year can be minimized. As a result, the burden on the network itself can be reduced. Further, when a pay-as-you-go line is used, cost performance can be improved by saving communication charges. The reason is, based on the date provided by the internal clock,
This is because only data that is really needed at that time is selected and sent by the date data comparing means.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram illustrating a configuration of a first embodiment of the present invention. FIG. 2 is a block diagram illustrating a configuration of a slave station according to the first embodiment of the present invention. FIG. 3 is a configuration diagram of a data transmission month setting table according to the first embodiment of the present invention. FIG. 4 is a flowchart showing a flow of a date data comparing unit according to the first embodiment of the present invention. FIG. 5 is a specific setting example of a data transmission month setting table according to the first embodiment of the present invention. FIG. 6 is an annual time chart showing a transmission possible period of each transmission data in a specific example according to the first embodiment of the present invention. FIG. 7 is a block diagram illustrating a configuration of a slave station according to the second embodiment of the present invention. FIG. 8 is a configuration diagram of a data transmission date setting table according to the second embodiment of the present invention. FIG. 9 is a flowchart showing a flow of date data comparing means in the second embodiment of the present invention. FIG. 10 is a specific setting example of a data transmission month setting table and a data transmission date setting table according to the second embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 bus-like network 2 master station 3 slave station 4 in first embodiment of present invention internal clock 5 date data comparing means 6 data transmitting means 7 synchronization signal detecting means 8 slave in second embodiment of present invention Station 9 Transmission standby means T1 Data transmission month setting table R1n according to the first embodiment of the present invention Record INF1n in T1 in which monthly settings in transmission data of n-th item are recorded Whether or not monthly transmission in transmission data of n-th item Information T2 A data transmission date setting table R2 according to the second embodiment of the present invention.
Record INF2mm in day 2

Claims (1)

(57) [Claim 1] A first station which transmits various telemeter data collected to a master station, the first station describing a transmission month for executing transmission for each data item of the telemeter data. , An internal clock that holds the current date and time, a date comparison unit that compares the transmission conditions of the first table with the month indicated by the internal clock, and a data item that matches the date A data transmission unit for transmitting data to the station.