JPH01112843A - Communication system for community communication line - Google Patents

Abstract

PURPOSE:To efficiently transmit information from plural slave stations to a master station without being superposed on each other by transmitting the information of definite capacity successively from the master station to the plural slave stations, and in response to it, transmitting the information addressed to the master station immediately after the slave station finishes receiving the information addressed to its own station. CONSTITUTION:This communication system consists of one master station 1, plural slave stations 2, 3, 4-N and a pair of two-way communication line 10 to connect both. Now, in the case of the master station 1 sends the prescribed information to the slave stations 2, 3, the master station 1 transmits alternately the information 21, 22, 23 addressed to the slave station 2 and the information 31, 32, 33 addressed to the slave station 3. Here, 21, 22, 23; 31, 32, 33 are assumed to be the information of the definite capacity. The slave stations 2, 3 transmit respectively the information 21', 22', 23' and 31', 32', 33 addressed to the master station 1 immediately after the termination of the reception of the information addressed to their own stations. Thus, since the respective slave stations 2, 3 transmit the prescribed information to the master station 1 within definite time immediately after the prescribed information is transmitted from the master station 1, the information from the respective slave stations 2, 3 is received successively by the master station 1 without being superposed on each other.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a communication system for a communal communication line.

[Conventional technology]

Conventionally, in most of this type of communication systems, one main station and a plurality of slave stations are connected via a set of bidirectional communication lines. The main station has a configuration in which multiple slave stations arbitrarily transmit data over the same line without any particular regularity, allowing them to communicate with the main station at times when no other lines are in use. It had become.

[Problem that the invention seeks to solve]

However, in the conventional example described above, multiple slave stations send data asynchronously to the same line when necessary, so collisions often occur in practice, and when a collision occurs, retransmission is required, so the transmission speed The disadvantage was that the transmission efficiency decreased.

[Purpose of the invention]

An object of the present invention is to provide a communication system for a joint communication line that can improve the disadvantages of the conventional example and can smoothly transmit information from a plurality of slave stations to a master station without mutually colliding with each other. , its purpose.

[Means for solving problems]

In the present invention, in a joint communication line communication system in which one master station and a plurality of slave stations mutually perform predetermined communications via a set of bidirectional communication lines, information transmission from the master station is The information is output to all slave stations sequentially at fixed time intervals, and the slave stations that receive the information send the specified information to the master station immediately after receiving the information addressed to them from the master station. The purpose of the present invention is to achieve the above-mentioned purpose.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The embodiment of FIG. 1 includes one master station 1 and a plurality of slave stations 2, 3, .
4 to N, and a set of bidirectional communication lines 10 that connect the two.

Now, assume that the master station 1 sends predetermined information to the slave stations 2 and 3. In this case, the information for slave station 2 is 21, 2□, 2
3, and the information for slave station 3 is 3°, 3□, 3. shall be.

The master station 1 provides information 21, 2□, 2. and information 31.321 for slave station 3.
33 are sent out alternately. Here, 2°, 2□, 2. ;3
．． ．． 3□, 3. are each -constant volume information.

Of the information shown in FIG. 2 (1), the slave stations 2 and 3 immediately send out the information destined for the master station 1 after receiving the information directed to their own station.

Figure 2 (2) shows information 2 sent from slave station 2 to master station 1.
The procedures of +', 2□'', and 2.'' are shown. FIG.

3□″, 3 steps are shown.

In this way, each of the slave stations 2 and 3 sends predetermined information to the main station 1 during a certain period of time immediately after the predetermined information is sent from the main station 1. This results in information 2+ from each slave station 2 and 3.

22.2 go ;3. ．． 3□, 3. are sequentially received by the main station 1 as shown in FIG. 2 (4) without any collision.

〔Effect of the invention〕

As described above, according to the present invention, a master station sequentially sends a certain amount of information to each of a plurality of slave stations, and in response, the slave station transmits information to the master station immediately after receiving the information. By transmitting information, it is possible to provide an unprecedented and excellent communication system for a joint communication line in which information from a plurality of slave stations can be efficiently sent to the master station without collision.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 (
1), (2), (3), and (4) are explanatory diagrams each showing a procedure for propagating information between a master station and a slave station. 1...Main station, 2.3.4~N...Slave station, 10...Community communication line. Patent applicant: Japan Electric Co., Ltd. Figure 1

Claims (1)

[Claims] (1) In a communication system of a joint communication line in which one master station and a plurality of slave stations mutually perform predetermined communications via a set of bidirectional communication lines, information transmission from the master station is At the same time, the slave stations that have received each of these pieces of information transmit the specified information to the master station immediately after receiving the information addressed to them from the master station. A communication system for a cooperative communication line, characterized in that it is configured to send data to.