JPS6025342A - Method for collecting polling data by radio - Google Patents

Abstract

PURPOSE:To reduce the time of data collection by collecting only a data having a change among data of each slave station. CONSTITUTION:Slave stations are divided into plural groups A, B, C and N to a master station 1 in a polling data collecting method collecting data of each slave station form the master station by using radio, and the master station 1 calls the slave station groups A, B, C and N sequentially. In each group, slave stations receive simultaneously a group signal from the master station 1 and check the change of the data of the own station. If there is a change in the data, the slave station transmits a start signal to the master station 1. In receiving the start signal from the slave station, the master station 1 transmits a slave station call signal to a group which transmits the start signal. The slave station having the data change returns the own data and the master station 1 collects the data.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wireless polling data collection method for collecting data from multiple locations at one location.

Conventionally, there is a polling method as a method of collecting data from multiple locations using wireless communication. FIG. 1 is a diagram showing the arrangement of a master station and slave stations for data collection using the polling method, and FIG. 2 is a diagram showing each signal in polling and their time relationships. In FIG. 1, 1 is a data collection master station, 2 is a group of slave stations that send data, a1 to an are slave stations, 21 is a slave station calling signal,
22 is a data signal sent to the master station 1; In FIG. 2, f a 1 to f a n are numbers from the master station 1 to the slave station
, fdl to fdn are data signals sent back from slave stations a1 to an to master station 1, tl is the calling signal time, and t2
is the data signal time, t3 is the space time, and t4 is the time interval of the paging signal.

The conventional polling method is explained using Figure 1.
The master station 1 sends a slave station calling signal to the slave station 2 by sequential polling using the calling signal 21, and the slave station 2 sequentially receives these, and if the signal corresponds to its own station, it sends its own data to the slave station 2. The signal is sent back to the master station 1 using the signal 22. This is repeated sequentially for each slave station a1 to an.

To explain this using FIG. 2, the master station 1 transmits the individual calling signal ral of the calling signal 2I to the slave station a1 for a time t1.
Send to. The slave station a1 receives the calling signal fa1,
Identify whether you are called and set the call signal fal
If the slave station a supports the data fdl during time t2,
1 returns to the master station 1. The master station l receives the data fdl of the slave station a1, and identifies it as the data fdl of the slave station a1 based on the relationship between the sending order of the slave station calling signal fal and the slave station data fdl. Next, the master station 1 at space time t3,
The calling signal ra2 of the slave station a2 is sent for a time L1 to bring out the slave station a2 as Ilf, and in response to this, the slave station a2 returns the slave station data fd2 to the master station 1 for a time of 2. The master station l receives the data fd2 and identifies it as the data fd2 of the slave station a2 based on the relationship with the sending order of the paging signal fa2. Thereafter, the same operation is repeated sequentially up to the slave station an. If necessary, start again from the slave station a1.

The ringing signal interval t4 is a space time t in the ringing signal time t2.
Looking at the margin of 3, t l + t 2 + t 3 = t
It's time for 4.

In order to collect data from slave stations a1 to an by polling using the conventional method, the required time is multiplied by the number of called slave stations, that is, n times the calling signal interval t4 of the slave stations, and the number of slave stations is If there is a large number of data, it takes a lot of time to collect data, and the disadvantage is that it cannot handle data that changes rapidly.

This invention was made in view of the above problems, and in order to efficiently collect data in response to changes in data, it focuses on the presence or absence of changes in the data of slave stations, collects only the data that has changed, and collects data that corresponds to changes in data. It is an object of the present invention to provide a wireless polling data collection method that reduces data collection time by preventing unnecessary data collection.

An embodiment of the present invention will be described below with reference to the drawings.

Figure 3 shows the arrangement of the master station and slave stations for data collection using the polling method of the present invention, Figures 4 and 5 show the time relationships of each signal in the polling method of the present invention, and Figure 6 shows the arrangement of the slave stations. FIG. 3 is a diagram showing a circuit for identifying data changes.

In FIG. 3, ■ is a master station that collects data, 2 is a slave station, and A, B, C, and N are a group of slave stations, a'1-an.

blxbn, cl-cn, nl-nn are slave stations in each group, 21 is a group call signal 1, 22 is a data signal, 23 is an activation signal, and 24 is a slave station call signal.

Figure 4 shows the time relationship of signals when there is a change in the data signal at slave station a2 of group A, and Figure 5 shows the time relationship of signals in groups A, B, C, N.
slave stations a1-a n, b1-b n.

The case where there is no data change in cl-cn and nl to nn is shown. In both figures, rA, rB, rc, rN are groups A and B.
, C, and N are not called, fS is a master station startup signal that causes master station 1 to call a slave station, fdl to fdn are slave station data signals, tl is slave station calling signal time, and t2 is a slave station call signal. Station data signal time, L3 is space time, t4 is slave station calling signal interval, t5 is group signal time, t6 is activation signal time, tl
is the group call signal interval.

In FIG. 6, 4 is a data input, 5 is a group input into which the signal is input when the group signal is received, 6 is a sequential circuit whose output is inverted every time the group input 5 is input, and 7.8 is a sequential circuit. 6
9 is a collation circuit that collates the data in the memory circuits 7 and 8 and outputs the data when the data in the memory circuits 7 and 8 are different; 10 is the collation circuit 9
The output is an activation output which sends out an activation signal 23.

Next, the operation will be explained. In FIG. 3, the master station 1 first sends out the group signal fA among the group call signals 21 of group A, and the slave stations a1 to an of group A receive the signal fA all at once.
Perform next polling. In the slave stations a1 to an, the group signal fA
When received, an input is applied to the group input 5 in FIG. 6, causing the sequential circuit 6 to be inverted. The output of the sequential circuit 6 is the group signal fA
When the output of the sequential circuit 6 is 1, the data input 4 is stored in the storage circuit 8. The output of the memory circuit 8 is compared with the output of the memory circuit 7 in a collation circuit 9 every time there is a group input, and if the output of the memory circuit 7.8 is different, a start output 10 is output from the collation circuit 9, and a start signal is output. Send fs.

When the activation signal 23 is received by the master station 1 in FIG.
Secondary polling is performed to sequentially receive this slave station calling signal 24 from 1 to an. If there is a data change in the slave station, a data signal 22 is sent back from the slave station to the master station l. Figure 4 shows a case where there is a data change in the slave station a2, the master station l transmits the group signal fA of the group call signal 21 for a time t5, the slave station a2 receives this, and the slave station a2 changes the data. Therefore, the activation signal fs is returned for a time t6. Master station 1 has a start signal fs
When received, fa1 to fan of the slave station calling signal 24 are sequentially transmitted. The slave stations a1 to an receive this sequentially. When the slave station calling signal fa2 is received by the slave station a2, the slave station a2 returns its own data fd2. The master station 1 identifies this data fd2 as the data of the slave station a2 based on the time order of the group call signal fA and the slave station call signal fa2 and the data fd2.

FIG. 5 shows slave stations al to an in groups A, B, C, and N.

When there is no data change in bl ~ bn, cl ~ cn, ' nl ~ nn, the group signal fA is sent from the master station 1, but there is no data change in the slave stations a1 ~ an (the activation signal fs is not returned). Therefore, after the group call signal time interval t7 time elapses,
The next group's calling signal fB is sent out.

Similarly, if there is no data change in the slave stations b1 to bn of group B, the activation signal fs is not returned, and after time t7 has elapsed, the next group's calling signal fc is sent out, and the same operation is repeated thereafter.

In the device of this embodiment, secondary polling is not performed for a group if there is no change in data for each slave station in that group, so the data collection time is reduced compared to conventional methods. It can be significantly shortened.

In the above embodiment, for convenience of explanation, the transmission and reception of signals between the master station 1 and the slave station 2 are shown by several lines, but since the transmission and reception of signals is performed serially in time, radio waves of the same frequency It is also possible to apply the breathtalk method in which one radio wave is used to alternately transmit and receive signals using a carrier wave modulated by a signal.

As described above, according to the present invention, in the wireless polling data reconstruction method, a large number of slave stations are divided into several groups, and the primary polling calls the groups, and the secondary polling calls the slave stations of each group. If there is no data change in each slave station of the group in the above primary polling, the secondary polling for that group, that is, the transmission and reception of signals for collecting data from the slave stations, is omitted. , it is possible to shorten the time for collecting unnecessary data, and has the effect of collecting a large amount of data in a short period of time.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the arrangement of a master station and a slave station for data collection using the polling method, Fig. 2 is a diagram showing each signal in the polling method and their time relationships, and Fig. 3 is a diagram showing data collection using the polling method of the present invention. Figures 4 and 5 are diagrams showing the arrangement of the master station and slave stations, Figures 4 and 5 are diagrams showing signals and their time relationships in the polling method of the present invention, and Figure 6 is a diagram showing a data change identification circuit of the slave station. It is. l... Master station, 2... Slave station, 21... Slave station calling signal, 22... Data signal, 23... Start signal, 24...
...Group call signal, fA-fN...Group call signal, fal
~fan...Slave station calling signal, fdl~fdn...Data signal, tl...Calling signal time, t2...Data signal time, t3...Space time, t4...Slave station calling signal Interval, t5...Group call signal time, t6...Start signal time, tl...Group call signal interval, 4...Data signal long, 5...Group signal input, 6...Order circuit,
7, 8...Storage circuit, 9...Verification circuit, 1o...
Startup output. In the drawings, the same reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] (In a polling data collection method in which data of each slave station is collected by a master station using X.11 radio, a station device collects data from one parent station and a group of slave stations obtained by dividing a number of slave stations into several groups. primary polling in which each slave station group is sequentially called from the master station, and the slave stations within the slave station group are sequentially called from the master station only for the slave station group that includes a slave station with data change. A wireless polling data collection method characterized in that data is collected by secondary polling. (2) Each slave station receives a group call signal during the primary polling. Write the input data in α, compare the stored data with the already stored data, and send a secondary polling start signal to the master station only if there is a change in the contents of both data. A wireless polling data collection method according to claim 1, characterized in that: