JPS5923139B2 - Data transmission method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data transmission system using a cable in which a small data device is embedded within a cable sheath.

As shown in FIG. 1, the conventionally known data transmission method is to connect a transmission line 1 in parallel with a data transmitter/receiver 2 at appropriate intervals along its length, or A plurality of data terminal devices 4 are connected in cascade, and each data transmitting/receiving device is connected to a plurality of data terminal devices 4, so that data can be transmitted and received between arbitrary data terminal devices. It was responsible for monitoring and managing the transmitting and receiving devices 2 and 3, as well as for data processing such as calculations.

In such a system, the role of the data transmitting/receiving devices 2 and 3 is that of the data terminal devices 4 (multiple units) attached to them.
It accepts data transmission/reception requests that occur at random times, sends them out to the transmission line 1 at appropriate timing, and at the same time sends them from among the data from the transmission line 1 to the data terminal device 4 attached to itself. The purpose is to select the appropriate data and transmit it to the data terminal device 4.

Further, the data terminal device 4 mainly consists of so-called data input devices and output devices such as a keyboard, a display device, and a teleprinter, and serves as an intermediary between a human (operator) and the transmission system. It also temporarily stores time signals (temperature, flow rate, etc.) from process equipment in a factory, etc., and transfers them to the central processing unit 5, and conversely, transfers command information from the central processing unit 5 to the process equipment. . In such a system, when installing the data transmitting/receiving devices 2 and 3, the cables (i.e., the sheath and transmission line) are cut at the necessary locations, the data transmitting/receiving devices 2 and 3 are connected, and then the sheath is installed in an appropriate place. It is processed in a certain way.

Problems in this case include the hassle of such construction, reduced reliability, and the difficulty of installing new data transmitting and receiving equipment.

The present invention eliminates the drawbacks of the prior art as described above,
The purpose of the present invention is to provide a data transmission method using a data device embedded cable 5 that facilitates the installation and expansion of data terminal devices and data transmitting/receiving devices.

The main point of the present invention is that, as shown in FIG. 2, the ultra-small data transmitting/receiving device 22 is connected to the transmission line 21 in the process before sheathing the cable, and each data transmitting/receiving device 22 is provided with a coupling device 6. The transmission line 21, the data transmitting/receiving device 22, and the coupling device 6 are covered with a common cable sheath 8.

Further, the coupling device 6 may be directly connected to the transmission line 21. To explain a data transmission method using a cable with such a configuration, first, when the system is started, the central processing unit 5 connected to one end of the cable transmits data specifying its operation to each data transmitting/receiving device 22. .

As a specific example, assuming that each data transmitting/receiving device 22 operates according to a so-called storage program method, the "data that defines its operation" is nothing but the program itself. Of course, in this case, each data transmitting/receiving device 22 must be capable of individual recognition. Thus, each data transmitting/receiving device 22 becomes operational, and each data terminal device 4 can mutually transmit data via its own coupling device 7 and the coupling device 6 of the data transmitting/receiving device 22. Become.

What is referred to here as a coupling device generates strength or weakness in the electric field or magnetic field in the vicinity depending on the voltage or current strength of the transmission circuit, or conversely, transmits data according to the strength or weakness of the electric field or magnetic field in the vicinity. It refers to a device that causes variations in circuit voltage and current, and a typical example is a coil.

An important aspect of the present invention is to make the data transmitting/receiving device 22 ultra-small, and if this is impossible, integration with the transmission line and common sheath will be impossible.

However, with LSI manufacturing technology that has developed significantly in recent years, this ultra-miniaturization is fully possible. An embodiment of the present invention will be described with reference to FIG.

3 transmission line consists of a balanced line 31 twisted in pairs, and data transmitting/receiving devices 32 are inserted intermittently here and there.A coil 36 as a coupling device is connected to this data transmitting/receiving device 32, and a coil 36 as a coupling device is connected to the outside of the cable. By electromagnetic coupling with the coil 37 as a coupling device, signals can be transmitted and received between the data transmitting/receiving device 32 inside the cable sheath 8 and the data terminal device 4 outside the cable.

The coil 37 outside the cable can also be connected to the data terminal device 4 via the data multiplexing device 9 when there is a plurality of data terminal devices 4. Further, a central processing unit 5 is connected to one end of the balanced line 31.
With such a device configuration, as mentioned earlier, when the system is started, the central processing unit 5 programs the data transmitting/receiving device 32 and performs load heating.
As a result, data transmission and reception between arbitrary data terminal devices 4 and between arbitrary terminal devices 4 and central processing unit 5 becomes a simple function using the method already described.

Generally, the data transmitting/receiving device 32 requires a power supply, and this is supplied from the inside of the central processing unit 5 by the power supply circuit 10.
It can be supplied via .

The present invention is not only applicable to data transmission; for example, by using a keyboard and a display device as the data terminal device 4, one central control device 5 can be used by a plurality of terminals in a so-called TSS (time signal transmission system). Sharing system) can be realized, and data terminal equipment 4
As a result, if microcomputers are used, a multi-computer network can be obtained. Furthermore, it is also possible to use a microcomputer as the data transmitting/receiving device. In addition, the data that defines the operation of any data transmitter/receiver can be transmitted from the central processing unit at any time during system operation, and the data that has been stored and stored up to now that defines the operation of each data transmitter/receiver can be restored. Changing the function of the device by updating it is also a town function.

The effects of the present invention are as follows.

(1) Since it is possible to embed data transmitting/receiving devices or microcomputers within the cable sheath at relatively short intervals, it is possible to move or install new data terminal devices with considerable freedom after the cable is laid.

(2) Since the cable of the present invention does not need to be cut in principle, installation work is easy and reliability is increased.

(3) Data transmitting/receiving device and microcomputer are LS
With the development of I technology, costs are rapidly decreasing, so
The cable of the invention can be realized at relatively low cost.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional example, FIG. 2 is an explanatory diagram of the principle of the present invention, and FIG. 3 is an explanatory diagram of an embodiment of the present invention. 1: Transmission line, 2, 3, 22, 32: Data transmitting/receiving device, 4: Data terminal device, 5: Central processing unit, 6, 7, 3
6, 37; Coupling device; 8: Cable sheath; 9; Data multiplexing device; 10; Power supply line.

Claims (1)

[Claims] 1. A coupling device that connects intermittently along the length of the transmission line,
A data transmitting/receiving device is provided and connected to the transmission line, and a central processing unit is connected to one end of a data device embedded cable configured by covering these with the same sheath, and the data transmitting/receiving device is embedded in the cable. can be individually recognized, and when the system is started or at any time during operation, the central processing unit transmits data specifying the functions of each data transmitting and receiving device to the data transmitting and receiving device, and the central processing unit , a data transmission system characterized in that data is transmitted and received between a data terminal device having a data transmitting/receiving device and a coupling device located outside the cable.