JPS5828974B2 - Data transmission method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data transmission system for transmitting data from a large number of terminal devices to a solid device through a relay device.

In this type of data transmission method, the relay device is equipped with a memory that stores the data sent from the terminal device, but if a power outage, surge, or noise occurs on the power distribution line, the memory may be erased or the stored contents may be lost. It may change.

Conventionally, there was a risk that such erroneous data would be sent to the solid device and processed as is.

Another object of the present invention is to provide data transmission that can prevent the erroneous data from being processed by the solid equipment when the transmitted data changes to erroneous data due to power outage or abnormality of the power distribution line. The purpose is to provide a method.

FIG. 1 shows an embodiment of the invention.

A large number of terminal devices 1 storing data are divided into a plurality of groups, and a relay device 2 is installed for each group.

The terminal device 1 and the relay device 2 are connected by a power distribution line 3.

The relay device 2 and the solid device 4 are connected by a communication line 5.

Instead of the communication line 5, a radio may be used.

A block diagram of the relay device 2 is shown in FIG.

The buffer memory 6 temporarily stores data transmitted from the terminal device 1 belonging to the relay device 2.

The abnormality detection unit 7 detects an abnormality when a power outage or other abnormality occurs in the power distribution line 3. When detected, the alarm memory 8 is set to store the occurrence of the abnormality.

The sequence control unit 9 controls all operations of the relay device 2, and the power distribution line transport control unit 10 and the communication line transport control unit 11 control injection of signals to the power distribution line 3 and communication line 5 or reception of signals.

When data of all the terminal devices 1 is collected in the solid device 4, first, a read command is sent from the solid device 4 to all the relay devices 2 all at once or sequentially to the relay devices 2 via a communication line.

When the relay device 2 receives the reading command, it resets the alarm memory 8 and erases its memory, and also distributes data from all the terminal devices 1 belonging to that relay device 2 according to the unique sequence and synchronization of each relay device 2. The information is transmitted by wire transport and sequentially stored in the buffer memory 6.

The solid device 4 receives the buffer from the relay device 2 after the time required for the relay device 2 to read all the data in the terminal device 1 or when a storage end signal is sent from the relay device 2. The data stored in the memory 6 is transmitted and collected.

Data transmission from each relay device 2 to the solid device 4 is performed sequentially at higher speed than communication line transport.

If a power outage occurs on the power distribution line 3 between the time the relay device 2 receives the reading command and the end of data transmission to the solid device 4, the memory capacity of the buffer memory 6 may be erased, or a surge may occur on the power distribution line 3. If the memory contents of the buffer memory 6 change due to noise or noise, an abnormality is detected in the power distribution line 3 in order to prevent the erroneous memory stored in the buffer memory 6 from being sent as data to the solid device 4 and processed. The abnormality detection unit 7 detects the occurrence of the abnormality, and in response to this detection, the alarm memory 8 is set to store the occurrence of the abnormality, and the data link error is recorded at the end of the data transmitted from the relay device 2 to the solid device 4. information is added and transmitted.

The contents of the buffer memory 6 are erased after being transmitted from the relay device 2 to the solid device 4.

Therefore, the storage function of the buffer memory 6 may be temporary, and relatively inexpensive memory elements can be used.

According to the illustrated embodiment, there is no need to synchronize the transmission between the terminal device 1 and the relay device 2 and the transmission between the relay device 2 and the solid device 4, eliminating waiting time. The data collection time to the actual device 4 can be shortened.

By sending reading commands to the relay device 2 all at once, data can be collected at high speed as a whole.

Furthermore, since the buffer memory 6 of the relay device 2 temporarily stores data, a relatively inexpensive memory element can be used.

In the present invention, if an abnormality occurs in the power distribution line between the time the relay device receives the reading command and the end of data transmission to the solid device, the alarm memo IJ4 stores the abnormality occurrence. However, since data error information is added to the data transmitted from the relay device to the solid device, it is possible to prevent erroneous data from being processed by the solid device. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram of a relay device thereof. DESCRIPTION OF SYMBOLS 1... Terminal device, 2... Relay device, 3... Distribution line, 4... Solid device, 5... Communication line, 6... Buffer memory 7... Abnormality detection part, 8...Alarm memory.

Claims (1)

[Claims] 1 Divide a large number of terminal devices that store data into multiple groups, install a relay device for each group, connect the terminal devices and the relay device with a power distribution line, and connect the relay device and the solid device. Each relay device has a buffer memory that temporarily stores data sent from the terminal device, an anomaly detection section that detects an abnormality in the distribution line, and a memory that stores the occurrence of an abnormality. An alarm memory is provided, a read command is sent from the solid device to the relay device, data is sequentially sent from the terminal device to the relay device upon reception of the read command by the relay device, the data is stored in the buffer memory &C, and the relay device After reading the data from all the terminal devices that belong to it, the data stored in the buffer memory is transmitted from the relay device to the solid device, and after the relay device receives the read command, the data is transmitted to the solid device. If an abnormality occurs in the distribution line before the power is terminated, the alarm memory records the abnormality and adds data error information to the data transmitted from the relay device to the solid device before transmitting it. data transmission method.