KR20000004443A - Multi communication control circuit using request signal - Google Patents

Abstract

PURPOSE: A multi communication control circuit is provided so that a network can be connected in a 1 to 1 connection type by the request of a main controller or subs in the communication network system which has a 1 to N connection type with regard to the main controller or a N to 1 type with regard to the subs. CONSTITUTION: A plurality of communication connecting parts(121¯12N) connects communication lines between a main controller(11) and transceiving subs(131¯13N) according to a request signal issued in the communication network system. A decoder(14) provides a control signal so as to connect transceiving lines to the communication connecting parts. Accordingly, the only corresponding devices can be driven in a 1 to 1 connection type by a request of the main controller and the subs, thereby reducing power waste of the system and improving the managing efficiency of the communication network.

Description

Multi communication control circuit using request signal

The present invention relates to a multi-communication control circuit using a request signal, in particular a 1: 1 connection by a request (request) of a main or sub in a system having a communication network of 1: N for the main or N: 1 for the sub. By connecting the network in such a way, the power consumption used in such a network can be greatly reduced and efficient communication management can be achieved.

In general, data communication between a main device and a sub device may be classified into a 1: 1 communication network of point-to-point and a 1: N or N: 1 communication network of a multi-drop method.

For example, FIG. 1A illustrates a form in which one main device MD and one sub device SD are connected 1: 1 as a transmission medium, and FIG. 1B illustrates a plurality of sub devices for one main device MD. The devices SD1 to SDn form a network.

In the above system, the multi-drop access method manages a plurality of sub devices SD1 to SDn as addresses by one main device MD, so that the node transmits and receives data in a polling method or a selective method when communicating with the node. Is doing

Therefore, the multi-drop method has a problem in that power consumption is required because a node in a network must always be alive, and the point-to-point method is not suitable for two or more communication lines by being connected to a single node.

An object of the present invention is to solve the above problems, which combines the advantages of the point-to-point method and the multi-drop method to enable network connection by the request signal, wasting power by the multi-drop method This eliminates the need for point-to-point communication management.

Figure 1a is an example of the prior art in which the main and the sub is connected by a transmission medium 1: 1:

1B is an example of the prior art in which a main and a sub are connected by a transmission medium in 1: N;

2 is an embodiment of a multi-communication control circuit according to the present invention;

3 is another embodiment of a multi-communication control circuit according to the present invention.

** Explanation of symbols for the main parts of the drawings **

11. Control parts 121-12N. Communication connection means

131-13 N. Sub device 14. Decoder

The present invention for achieving the above object is a plurality of communication connection means for interconnecting the communication line according to the request signal between the main control unit and a plurality of transmission and reception sub, and a control signal for connection of the transmission and reception line to the communication connection means It characterized in that the decoder is provided to provide.

Hereinafter, by referring to this in more detail with the accompanying drawings will be understood more specific features of the present invention.

2 shows a multi-communication control circuit according to the present invention.

Here, the main control unit 11 is connected to the plurality of transmission / reception sub-devices 131 to 13N, and a communication line is connected between the main control unit 11 and the transmission / reception sub-devices 131 to 13N according to the request signal. A plurality of communication connecting means 121 to 12N which are connected to each other are connected.

In addition, the decoder 14 to the communication connection means 121 to 12N provides a communication connection control signal to the communication connection means 121 to 12N according to an address signal sent from the main control unit 11 through the address bus AB. ) Is connected.

The communication connecting means 121 to 12N are connected to the transmitting end and the receiving end R _X and T _X of the control unit 11, respectively, and connect or disconnect lines with a communication connector y such as RS 485, respectively. The electronic switch (x) and each communication connector (y) to which the transmission and reception lines are connected by these electronic switches (x).

In addition, the electronic switches x are connected to be controlled by decoder signals a, b, c, and n output from the decoder 14, respectively.

On the other hand, the input of the decoder 14 may be applied having a configuration in which the request signal terminals required by each sub device 131 to 13n are connected through the communication connector y as shown in FIG. 3.

According to the present invention having the above configuration, any one of the sub devices 131 to 13n as shown in FIG. 2 sends a request signal through the communication connection means 121 to 12n for communication connection. An address signal is sent to the decoder 14 to make a communication connection with any of the ones 131 to 13n, and the decoder 14 uses any one of the outputs a to n as active logic to communicate with the communication means 121 to 12n. Switches the electronic switch (x) from the open state to the close state.

In this case, the control unit 11 may set the input / output relationship as shown in the following table through the decoder 14.

Table 1

Output logic of output port ABC of control unit 14 The output of the decoder A B C 0 0 0 a One 0 0 b 0 One 0 c One One One d

Therefore, when the electronic switch (x) of the communication connection means (121 to 12n) is connected by the above relationship, only the node in which the communication connector (y) is connected to the sub device (131 to 13n) and the transmission / reception line is connected is operated. Will proceed.

In addition, the controller 11 stores a request signal from other sub devices 131 to 13n when it is currently working with one of the sub devices 131 to 13n, and stores the request signal in the form of FIFO. Prioritized network connection will be performed.

Meanwhile, FIG. 3 shows another embodiment of the present invention. When a request signal is generated from each of the sub devices 131 to 13n, the signal is transmitted through the communication connector y of the communication connection means 151 to 15n. Provided as an input of the decoder 14, in this case, the decoder 14 performs a network connection with the control unit 11 by controlling the electronic switch (x).

In addition, when a request signal is simultaneously input from each sub device 131 to 13n, the priority of the request signal may be detected through the decoder 14.

In the present invention as described above, when establishing a multi-drop communication network between a main device and a plurality of sub devices, the main device and a plurality of sub devices can be interconnected by a 1: 1 connection method by a request signal, thereby wasting power of such a system. Can be actively reduced and efficient management of the network can be achieved.

Claims (2)

Between the main control unit 11 and the transmission and reception subs 131 to 13N, a plurality of communication connection means 121 to 12N for interconnecting communication lines in accordance with request signals generated from the system, and the communication connection means 121 to 12N. 12N), the multi-communication control circuit using the request signal, characterized in that the decoder 14 is provided for providing a control signal for connection of the transmission and reception lines According to claim 1, wherein the communication connection means (121 to 12N) are respectively connected to the transmitting end and the receiving end (R _X , T _X ) of the control unit 11 is connected to the communication connector such as RS 485 by the output of the decoder 14 ( y) and a respective electronic switch (x) for connecting or disconnecting mutual transmission and reception lines of the control unit 11, and each communication connector (y) to which the transmission and reception lines are connected by these electronic switches (x). Multi-communication control circuit using a request signal, characterized in that