JPS6129235A - Telemeter system - Google Patents

Abstract

PURPOSE:To attain the assured transmission of data in a short time by dividing plural slave stations into groups to allocate the call signals of different frequencies to these groups and giving the polling to a slave station within a group from a master station that is called by the call signal. CONSTITUTION:Call signals of different frequencies are allocated to slave station groups 11-13 including slave stations 31-33, etc. When the data to be transmitted is produced at the station 31, for example, a slave station 34 sends a call signal of a frequency f1 to a circuit 8 from an oscillator 5 through a transmitting/receiving part 4. A master station 2 receives the call signal and detects the call signal of the frequency f1 through a frequency discriminator 71. A transmitting/receiving part 6 gives the polling to slave stations 31-33 of the group 11 that transmits the call signal of the frequency f1. The part 4 of the station 31 transmits data and the part 6 of the master station 2 receives the data.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] This invention relates to improvements in telemetry systems.

[Technical background of the invention and its problems] A polling method is known as a conventional telemeter method. In the polling method, a master station sequentially calls a plurality of slave stations, and when the called slave station has data, the slave station sends the data to the master station. However, this polling method has the drawback that even if data is generated in the slave station, the data cannot be sent until a call is received, and a long time is required. In particular, as the number of slave stations increases, the time required becomes longer, and necessary data may not be sent out in a timely manner.

Another method is that each slave station can call the master station using a calling signal of a different frequency, and the slave station that has generated data to send calls the master station, and the master station responds. Some received and received data from the corresponding slave stations.

However, according to this method, when calls conflict,
Interference with the ringing signal could occur. In other words, as the number of slave stations simultaneously calling the master station increases, the master station becomes unable to discriminate between frequencies.

Furthermore, a method that combines a polling method and the above-mentioned calling method is also known. In this method, polling is performed at predetermined time intervals, and the time period when polling is not performed is supplemented by a call method from a slave station. But even by such a method.

When each system was used, its own drawbacks appeared, and it could not be said to be a sufficient telemeter system.

[Object of the Invention] The present invention was made in view of the drawbacks of the conventional telemeter system as described above, and the purpose of the present invention is to provide a telemeter that can shorten the time required for data transmission and that can reliably transmit data. The purpose is to provide a method.

[Summary of the Invention] Therefore, in the present invention, a calling signal of a different frequency is assigned to each of a plurality of slave station groups consisting of a plurality of slave stations,
When data to be transmitted is generated in a slave station, the master station is called by a paging signal of the frequency assigned to the slave station, and the called master station transmits data to the slave station assigned by the paging signal of the frequency used for the call. The above objective is achieved by polling each slave station in the station group and obtaining data from the slave station.

[Embodiments of the invention] The present invention will be described in detail below with reference to two drawings.

FIG. 1 is a block diagram of a telemeter system employing the method of the present invention. In the same figure, 11°12.13-
... indicates a slave station group, and 2 indicates a master station. There are multiple slave stations in slave station group 11.1213-! It is included. In FIG. 1, slave station group 11
The slave stations 31, 32, 33, . . . are shown.

The configuration of each slave station is similar to that of the slave station 31. The slave station 31 has
A transmitting/receiving section 4 and a calling signal generator 5 are provided. The oscillator 5 outputs a calling signal having a frequency fl. Similarly, from slave station group 11, the frequency is fl
The slave station group 13 outputs a calling signal with a frequency of 1, and the slave station group 13 outputs a calling signal with a frequency of f3. In this way, each slave station group outputs a calling signal of a different frequency.

The master station 2 includes a transmitting/receiving section 6 and a slave station group 1. .

12. The same number of frequency discriminators 71, 72 as 13...
゜73... is provided. Each frequency discriminator 717
2.73-.- are frequencies f, , f2 . A call signal of f3... is detected. The transmitter/receiver section and oscillator of each slave station, the transmitter/receiver section 6 and frequency discriminator 71°727 of the master station 2
3... is connected by line 8 □.

The transmitting/receiving section of the slave station receives the polling signal from the master station 2, and when there is data to be sent, sends this data to the line 8.
Send via. Furthermore, when the frequency discriminator 71, 72, 73, etc. detects a calling signal, the transmitting/receiving unit 6 of the master station 2 sends out a polling signal to each slave station in the corresponding slave station group, and the polling signal is sent out from the slave station. Receive the data.

In such a telemeter system, data is sent to the master station 2 in the following manner. For example, assume that data to be transmitted is generated in the slave station 31 of the first slave station group. Then, slave station 3. Then, the transmitting/receiving section 4 outputs a calling signal of frequency f1 via the line 8. The master station 2 receives the calling signal, and the frequency discriminator 7 detects the calling signal of frequency f. The transmitting/receiving unit 6 transmits each slave station 3* of the slave station group 11 that uses a calling signal of frequency f1,
Polling is performed at 32, 33... The transmitting/receiving section 4 of the slave station 31 sends out data. The transmitter/receiver 6 of the master station 2 receives this data.

Since the method of calling from the slave station is adopted in this way, the waiting time is reduced. I do polling, but
Since this is carried out only for grouped slave stations, the time required is much shorter than in the past. In addition, although calls are made from slave stations, the frequency of the calling signal is the same for slave station groups, so there are fewer calls overall, and even when calling signals are output from multiple slave station groups at the same time, the frequency of the calling signal is Since the number of calls is small, it is possible to distinguish which slave station group has made a call, making it possible to send data reliably.

Considering a specific example, if there are IH slave stations, polling alone will result in 100 pollings, which will increase the waiting time, and each slave station will have to discriminate between signals of 100 frequencies when calling. First, it is difficult to distinguish between multiple call signals if they are output at the same time.

However, in this embodiment, if 10 slave station groups each consisting of 10 slave stations are created, the polling time will be reduced to one-tenth of the conventional method.
Therefore, the required frequency of the calling signal is 10, and discrimination is easy.

Note that the slave station and the master station may be connected wirelessly.

[Effects of the Invention] ``As explained above, according to the present invention, slave stations are grouped, the slave stations of each group call the master station using a different frequency for each group, and the master station makes the call. Since polling is performed for each slave station within the station group,
The time required to send data is short, and data is sent reliably.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a telemeter system employing the method of the present invention.

Claims (1)

[Claims] A calling signal of a different frequency is assigned to each of a plurality of slave station groups consisting of a plurality of slave stations, and when data to be transmitted is generated in the slave station, the master station is called by the calling signal of the frequency assigned to the slave station. , a telemeter system characterized in that the called master station obtains data from the corresponding slave stations by polling each slave station of the slave station group assigned by the calling signal of the frequency used for the call.