JPS62142433A - Self-registration type sequential communication method - Google Patents

Abstract

PURPOSE:To improve the line efficiency by registering the on-line registration of its own from each terminal equipment to other terminal equipment at each prescribed time interval and informing a link request to a network. CONSTITUTION:Terminal equipments A, B, C, D, M and N register the registration text of their own in the order of terminal equipments. A '0' at the end of each registration text represents a monopoly statement, the other terminal equipments are in reception state and '1' at the end indicate a token flag. The registration text is sent in a line loop L at each prescribed time. A normal terminal equipment sets a registration bit 1 at each time and when the address is preceding to its own address and the registration test does not come within a prescribed time, the registration is cancelled. After the registration is finished, when a data transmission request comes from a connected computer or terminal T, the data is sent to the opposite terminal equipment synchronously with its own sequence.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a 2B-1 communication method for data communication in a network such as a local EL network in which a plurality of terminal devices are connected by a line loop. It is.

2. Description of the Related Art Methods for communicating between a plurality of terminal devices include a polling selector method (suitable when a plurality of slave devices are provided for one parent device), a token passing method, and the like. In particular, the token 0 panning method is used when multiple terminals have equal priority.

This token passing method means that if a flag called a token is flowing in the line loop, it indicates that the line is idle, and the terminal that catches the token has priority over the line and can transmit. This is a method of sending out a flag that causes other terminals to enter the receiving state. This flag enables other terminals to receive data, thereby establishing a link (data connection) within the loop.

Problems to be Solved by the Invention However, among the methods mentioned above, the polling selector method requires one base unit, and if the base unit fails, the entire network will fail.Go to 3. It becomes 17'. Furthermore, since communication between child terminals is performed via the parent device, it has the disadvantage that it takes time.

In addition, in the token passing method, each terminal captures the token once and then sequentially sends it to the next terminal.
It takes time to send the information to all terminals in order. Note that in a method that captures tokens that flow infinitely in a loop instead of sending them sequentially, the method of determining priorities among multiple terminals and the procedure for allocating communication rights evenly become complicated.

The present invention aims to simplify the complicated procedures in these communications.

Means for Solving the Problems In order to solve the above problems, in the communication method of the present invention, each terminal registers itself online with other terminals at fixed time intervals, and requests linking to the network. This is a method of notification.

Function: When each terminal outputs a self-registration statement in turn at a fixed time interval, it is possible to know its own turn from the sender's station address among the sent data. When each terminal device receives a registration message whose address has been sent from a higher-level device, it is supposed to transmit its own registration message within a certain period of time, and after this time, the terminal device cannot register and will not be able to perform the next registration. At the same time, the registration will be canceled by the next terminal device. Each terminal always receives this registration message and can know its own registration status. When this registered sentence goes around to each terminal, a data sentence is sent if there is data to be sent, or a no-data sentence is sent if there is no data, and the linking is completed by sequentially progressing to the final terminal.

Example Examples of the present invention will be described below.

In FIG. 1, A, B, C, D, M, and N are terminals, to which computers or terminals T are connected, and they are also interconnected by lines to form a network.

In the above configuration, each terminal device A, B, C, D.

M and N register each self-registration sentence shown in FIG. 3 in terminal order as shown in FIG. Note that the O at the end of each registered six-beno sentence indicates an exclusive declaration, other terminals enter a receiving state, and the 1 at the end indicates a token flag (empty state).

This registration text is transmitted within the line loop L at regular intervals. A normal terminal device sets the registration bit 1 every time, and if the address is still ahead of itself and this registration message does not arrive within a certain period of time, it erases the registration. After this registration is completed, if there is a data transmission request from the connected computer or terminal T, the data is synchronized and transmitted to the other terminal in its own order.

Effects of the Invention As described above, according to the present invention, each terminal device can determine the normal state or abnormal state of each other terminal device, thereby eliminating unnecessary communication and waiting time, and improving line efficiency. Moreover, since the procedure is simple, there is no confusion on the line.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a network that implements a self-registration sequential communication method showing an embodiment of the present invention, Fig. 2 is a six-vane diagram showing station registration statements of the network, and Fig. 3 is a diagram of each terminal in the network. It is a figure which shows the registration text of a device. A, B, C, D, M, N...Terminal, L...
・Line, T... Computer switch or terminal. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3

Claims (2)

[Claims] (1) A network is formed by connecting multiple terminals via a line, and each terminal registers itself online to other terminals at regular intervals and notifies other terminals of a request to link to the network. A self-registration sequential communication method characterized by: (2) A patent characterized in that each terminal monitors the source address in the data transmitted from other terminals, waits for its own turn, and transmits its own transmitted data together with its own address into the network. A self-registration type sequential communication method according to claim 1.