JPH024048A - Communication control device - Google Patents

Abstract

PURPOSE:To construct a multipoint communication system with a simple device by setting the address of one secondary station to a secondary station address transmission line and necessarily making the secondary station connected to a primary station into one station. CONSTITUTION:Plural secondary stations are connected to one primary station by a transmission line 10 for transmitting and a transmission line 11 for receiving. Each secondary station is equipped with a self-station turning circuit 25 to tune a transmission and a reception to the self-station, a self-station completion detecting means 24 to detect the completion of the transmission and reception processing of the self-station and an other station control circuit 26 to designate the secondary station to execute the next transmission and reception when the transmission and reception control of the self-station is completed. Between the secondary stations, a secondary station address transmission line 12 is provided in which the secondary address information of the output of the other station control circuit 26 flows. To the secondary station address transmission line 12, the address of one secondary station is set, and the secondary station connected to one primary station is necessarily made into one station.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a communication control device that performs time division multiplex transmission between a primary station and a plurality of secondary stations.

Conventional technology In recent years, equipment systems in the FA field have become larger and the number of equipment groups arranged in one system has increased, and networks have become almost indispensable as a means of synchronizing and transmitting information between these equipments. It's coming.

An example of a conventional communication control device in a multi-point communication system will be described below with reference to the drawings and FIGS. 6 to 8.

In the overall configuration shown in FIG. 6, 1 is a primary station, 2, 3 .
4 is the secondary station A, B, C110 is the transmission line for transmission,
11 is a transmission line for transmission. Each secondary station A2 shown in FIG.
．． B3. In C4, 20 is a receiving interface;
Reference numeral 21 denotes a transmission interface, 23 a transmission line monitoring means for monitoring whether received data is addressed to the own station, and 22 a transmission/reception control unit that performs transmission/reception processing of data for the own station.

The performance of the communication control device configured as described above will be explained below.

First, the primary station 1 sends a message to the secondary station A2. B3. The transmission data carrying the address information of C4 and then the data is transferred to the transmission transmission line 1o. Each secondary station A 2. B 3. At C4, the transmission transmission path monitor means 23 determines via the reception interface 20 whether the address information of the transmission data is addressed to the own station. If the address information indicates secondary station A2,
Transmission transmission path monitoring means 2 of secondary station B3 and secondary station C4
3 determines that the information is not addressed to the own station, and transmits and receives the information to the transmitting/receiving control unit 2.
I can't make 2. The transmission line monitoring means 23 of the secondary station A2 confirms that the information is addressed to its own station, and causes the transmission/reception control section 22 to start data transmission/reception control.

When the data communication between the primary station 1 and the secondary station A2 ends, the primary station 1 starts data communication with the secondary station B2. That is, the address information of the secondary station B3 is placed on the atrea frame of information placed on the transmission transmission path 1o. The transmission line monitoring means 23 of the secondary station A2 and the secondary station C4 determine that the information is not addressed to their own stations, and do not operate the transmission/reception control section 22.

The transmission line monitoring means 23 of the secondary station B3 confirms that the information is addressed to its own station, and causes the transmission/reception control section 22 to start data transmission/reception control. The same process is repeated thereafter.

Problems to be Solved by the Invention However, in the above-described configuration, all of the plurality of secondary stations maintain their own station even when a secondary station other than the own station is communicating data with the primary station. It is necessary to determine whether the data is intended or not.1. For this purpose, it has the disadvantage that it is necessary to include a transmission line monitoring means for constantly monitoring the transmission line.

In view of the above-mentioned problems, the present invention provides the simplest point-to-point communication control device that can perform multi-point multiplex transmission communication without providing a transmission path monitoring means in the secondary station. It is something to do.

Means for Solving the Problems In order to solve the above problems, the communication control device of the present invention includes:
In a multipoint communication system that includes one primary station that can transmit and receive data, and multiple secondary stations that are connected by transmission lines for transmission and transmission lines for reception, each secondary station can transmit and receive data to and from its own station. and a secondary station control circuit that specifies the secondary station to perform the next transmission/reception upon selection, and secondary station address transmission in which secondary station address information output from the other station control means flows between these secondary stations. It is characterized by having a road.

According to the above-described configuration, the present invention sets the address of one secondary station in the secondary station address transmission path in a multi-point communication system, and the secondary station connected to the primary station is By always having only one station, there is no need to monitor the transmission line when other secondary stations are communicating data, and the conventional means of monitoring the transmission line can be eliminated, allowing point-to-point communication. A multipoint communication system can be constructed using a simple communication control device.

Embodiment Below, regarding the communication control device of the first embodiment of the present invention, the first
This will be explained with reference to FIGS.

In the overall configuration of this embodiment shown in FIG. 1, 1' is a primary station, 2.3.4 is a secondary station A, B, C, 10 is a transmission line for transmission, 11 is a transmission line for lightning reception, 12 is a secondary station address transmission path. Secondary station A2. shown in FIG. B3. In the configuration of C4, 24 is a local station end detection means, 26 is a local station opening circuit, and 26 is an other station control circuit, and each of these circuits 25.
26 and means 24 are provided with the secondary station address transmission path, which is different from the conventional example.

The details and operation of the communication control device configured as described above will be explained.

At the initial stage of the system, the secondary station address transmission path 12 is set to a specific station (secondary station A2 in this case). The local station selection circuit 26 of the secondary station A2 is connected to the secondary station address transmission path 1.
2, it is determined that the address of the own station is valid, and the reception interface 2o and the transmission interface 21 of the own station are enabled, thereby enabling data transmission and reception with the primary station 1.

First, the primary station 1 transmits the primary station transmission data shown in FIG. 4 to the secondary station A2. The secondary station A2 is in a receiving state and performs data communication with the primary station 1. During this time, other 2
Next station B3. C4 is in a non-receivable state, and the transmission line 10 for transmission from the primary station 1 to the secondary station group is connected only to the primary station 1 and the secondary station A2. When the secondary station A2 completes its own data communication, it sets in the other station control circuit 26 the address of the station that will perform the next data communication (for example, secondary station B3), which is included in the primary transmission data. The other station control circuit 26 is the third
As shown in the figure, the secondary station B3 is connected to the secondary station address transmission path 12.
Set the address of Then, the local station selection circuit 26 of the secondary station A2 determines that the secondary station address transmission path 12 is not the local station address, disables the reception interface 20 and the transmission interface 21, and switches the primary station 1
Make data transmission and reception impossible. The local station selection circuit 26 of the secondary station B3 determines that the secondary station address transmission path 12 is the local station address, puts the receiving interface 20 and the transmitting interface 21 of the local station into an enabled state, and switches the local station to the primary station 1. Data transmission/reception is made possible by one bear. The subsequent processing is almost the same as the operation of the secondary station A2, but differs in the following points.

The other station control circuit 26 of the secondary station B3 differs in the way it sets the address of the secondary station C4 on the secondary station address transmission line 12. Thereafter, the same process is repeated for the secondary station C4 and the secondary station A2 that performs the second process.

FIG. 5 is a schematic block diagram of the second embodiment of the present invention. The difference from the first embodiment is that the secondary stations are grouped (unitized) 13.14, and within the units 13.14. This is the first embodiment.

Effects of the Invention As described above, according to the present invention, when a primary station is performing data communication with another secondary station, it is possible to eliminate the need to monitor the reception port, and to connect the transmitter/receiver circuit to a point-to-point・It can be simplified to the same level as the point (station to station only) communication method.

[Brief explanation of the drawing]

Fig. 1 is a schematic block diagram showing the overall configuration of the first embodiment of the present invention, Fig. 2 is a schematic block diagram showing the overall configuration of the second professional embodiment of the same secondary station, and Fig. 6 is a conventional example. The schematic block diagram of Figure 7 is the conventional block diagram of Figure 1 (0--Ichiganuma borrowed/discontinued, 1... primary station, 2, 3.4... secondary station). , 10... Transmission transmission line, 11... Receiving transmission line, 12... Secondary station address transmission line,
24... Own station end detection means, 25...
Local station selection circuit, 26...Other station control circuit. Name of agent: Patent attorney Toshio Nakao and one other person

Claims (1)

[Claims] In a multipoint communication system that includes one primary station that can transmit and receive data, and multiple secondary stations that are connected by transmission lines for transmission and transmission lines for reception, each secondary station can transmit and receive data to and from its own station. A local station selection circuit that selects a station, a local station end detection means that detects the end of the local station's transmission/reception processing, and an other station control circuit that specifies the secondary station to perform the next transmission/reception when the local station's transmission/reception control is completed. and the secondary station address information output from the other station control means flows between these secondary stations.
A communication control device characterized by comprising a next station address transmission path.