JPS63211498A - Information transmission - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an information transmission method.

[Prior Art] Information transmission systems used to collect information from measuring instruments and detectors installed in remote locations generally include a star network as shown in Fig. 4 and a cascade network as shown in Fig. 5. is used.

In FIG. 4, the information captured by the detector 1 is collected by a transmission device 2, passed through a transmission path 3, and stored in a collection device 4. In the star network configured in this way, each transmission device 2 has an individual transmission path 3, and each transmission device 2 has a transmission path 3, and each transmission device 2 has a transmission path 3.
is directly connected to.

On the other hand, in the cascade network shown in FIG. 5, the transmission device 2 has a relay function, and not only relays information from other transmission devices 2, but also transmits data collected at its own station. In this system, there is only one transmission line 3 that enters the collection device 4.

A star network is suitable for measuring a wide area in a planar manner. Furthermore, the star network has the advantage that even if a failure occurs in a certain transmission device 2 or transmission line 3, measurements in other parts are not affected. However, it has the disadvantage that the total length of the transmission line 3 increases as the 1p1 fixed range expands. Especially when the measurement points are lined up in a line, it is cost-effective to provide one high-speed transmission line 3 rather than a large number of low-speed transmission lines 3, and a cascade network as shown in Fig. 5 is advantageous. used.

The data transmission method is the same in both star networks and cascade networks, and it is common to periodically transmit information at regular intervals as shown in FIG. In this case, the transmission speed required for the transmission path is as shown in Figure 7 in the case of a star network.
One transmission device is determined by the amount of information transmitted at one time and the repetition period, and in a cascade network, it is determined by the total amount of information transmitted by all transmission devices at one time and the repetition period. In this periodic transmission method, the time resolution is determined by the transmission repetition frequency, so
In order to improve the time resolution, the repetition frequency must be increased. Accordingly, it is necessary to increase the transmission speed of the transmission line, and the cost of the transmission line for both the star network and the cascade network increases. Furthermore, since the amount of data processed by the collection device increases, a device with high processing speed is required, which also causes an increase in costs.

[Problems to be Solved by the Invention] The above-mentioned conventional technology has a problem in that it is necessary to increase the transmission speed in order to improve the time resolution, which increases the cost of the transmission path and the processing device that is the collection device.

In particular, when using a detector for security or security purposes, the same information indicating a normal state is transmitted most of the time, which has the disadvantage of poor efficiency. In addition, when using optical fiber as a transmission path, a large amount of information is transmitted, so
Another problem is that the power consumption of the light emitting element for transmission increases.

The present invention has been made in view of the above points, and it is an object of the present invention to provide an information transmission method that suppresses an increase in the amount of communication information and makes it possible to improve temporal resolution.

[Means for solving the problem] The above purpose is to provide a judgment function to the transmission device so that the information transmission from the transmission device can be changed between the transmission when the output of the detector changes different from the predetermined output and the predetermined one. This is achieved by combining transmission with a period longer than the transmission period.

[Function] The information transmission from the transmission device has a judgment function, and the transmission when there is a change in the output of the detector different from the predetermined output and the transmission with a cycle longer than the predetermined cycle are combined. It will be carried out as follows. In this way, since information is transmitted every time a change is detected, time resolution can be increased. Furthermore, since the information is not transmitted unless there is a change, the amount of information to be transmitted can be reduced, and power consumption due to transmission can be suppressed. Furthermore, since transmission with a cycle longer than the predetermined cycle is also used, it is possible to provide high reliability against loss of information due to noise or the like.

[Example] The present invention will be described below based on the illustrated example. An embodiment of the present invention is shown in FIGS. 1 and 2. FIG.

Note that parts that are the same as those in the conventional system are given the same reference numerals, and therefore their explanations will be omitted. In this embodiment, information is transmitted from the transmission device by providing a judgment function to the transmission device, and transmitting information when there is a change in the output of the detector different from the predetermined output, and transmitting information with a cycle longer than the predetermined cycle. I decided to do it. By doing this, it becomes possible to suppress the increase in the amount of communication information and increase the temporal resolution, thereby obtaining an information transmission method that makes it possible to suppress the increase in the amount of communication information and increase the temporal resolution. be able to.

In other words, both Figures 1 and 2 use transmission with a cycle longer than a predetermined cycle and transmission when there is an output change (state change), but Figure 1 uses the above-mentioned method. When applied to the star network shown in Figure 4,
It is assumed that three binary output detectors 1 are connected to the transmission device.

First, time t. The state at is the initial state. When the output of detector 1 (B) changes at time t1, the transmission device immediately transmits this change. The content to be transmitted at this point is to detector 1 (
Information on only B) or information on all detectors 1 (A, B, C) may be used.

Next, monitoring is performed with the state changed at time t1 as a steady state. Detected product 1 (C) at time t2 immediately after time t
When the output changes, it also transmits information immediately. In this way, since information is transmitted every time a change is detected, time resolution can be increased. Furthermore, since no data is transmitted unless there is a change, the amount of information to be transmitted is smaller than in conventional periodic transmission methods, and power consumption required for transmission can be suppressed.

Especially when using optical fibers, the power consumed by light-emitting elements for transmission accounts for a large proportion of the power consumption of the entire information transmission system, so by adopting a configuration in which the elements emit light only during transmission, the power consumption can be significantly reduced. can be suppressed.

However, if the information being transmitted is erroneously transmitted due to noise etc., the collection device cannot correct the erroneous information until the next change is detected. , that is, since we also used the transmission of the states of all detectors 1 (A, B, C) at relatively long time intervals t,
Loss of information due to noise etc. can be prevented and a highly reliable information transmission method can be achieved.

In this way, according to this embodiment, the amount of communication information is small, the time resolution can be increased, and low-speed transmission lines and transmission devices can be used.
The price of the information transmission system can be reduced.

FIG. 3 also shows a modified example of a cascade network according to an embodiment of the invention. By duplicating the transmission line 3 and connecting it in a loop, this prevents the entire transmission system from stopping even if one transmission device 2 fails. Even in the case of such a loop-like connection, according to the transmission method of the present invention (see FIG. 2), the same effects as in the case described above can be achieved.

[Effects of the Invention] As described above, the present invention makes it possible to suppress an increase in the amount of communication information and improve the temporal resolution. It is possible to obtain a method for transmitting information using the following methods.

[Brief explanation of the drawing]

FIG. 1 is a timing diagram of information transmission according to an embodiment of the information transmission method of the present invention, FIG. 2 is a timing diagram of information transmission according to the same embodiment, and FIG. 3 is a cascade network according to the same embodiment. FIG. 4 is an explanatory diagram showing the configuration of a star network, FIG. 5 is an explanatory diagram showing the configuration of a cascade network, and FIG. 6 is a star network of a conventional information transmission method. Timing diagram of information transmission in cascade network FIG. 7 is a timing diagram of information transmission in a star network of the conventional information transmission method. 1: Detector, 2: Transmission device, 3: Transmission path, 4: Collection device. 3rd eye 4th concave

Claims (4)

[Claims] (1) An information transmission system comprising a detector, a transmission device, a transmission path, and a collection device, in which information captured by the detector is collected in the transmission device, and then transmitted from the transmission device through the transmission path. In the information transmission method in which information is transmitted to the collection device, the transmission device is provided with a determination function so that the information transmission from the transmission device is performed when the output of the detector changes different from a predetermined output. An information transmission method characterized in that transmission is performed in combination with transmission having a cycle longer than a predetermined cycle. (2) The information transmission system is formed of a radial transmission system centered around the collection device, with one transmission path dedicated to the transmission device being provided between each transmission device and the collection device. An information transmission method according to claim 1, wherein the information transmission method is performed by: (3) The information transmission system is such that the transmission device has a relay function, and one or more devices are connected in the middle of one transmission path to perform multi-stage relay. The information transmission method described in Section 1. (4) The information transmission method according to claim 1, 2, or 3, wherein the information transmission system is a combination of the radial transmission system and the multi-stage relay transmission system.