JPH05265905A - Data transmission equipment - Google Patents

Abstract

PURPOSE:To uniform the software of a transmitting function, and a transmission-tracing function by storing shared information shared by plural electronic computers, and controlling the transmission of transmission information by a transmission request from a controller. CONSTITUTION:Electronic computers 14 and 15 set data required for transmission data calculated by the computers at a shared memory 3. In a data transmitter 16, at the time of the transmission request, the access and edition of the data required for the data transmission to the controller 10 or 11 responding to the transmission request is operated from the shared memory 3 by a data editing means 4, and the data are transmitted to the controller 10 or 11 responding to the transmission request by a transmission control means 7. The edited data are stored in an outside storage device 6 being a storage medium by a data writing means 5. The data stored in the outside storage device 6 are read by a data reading means 9 at the time of a reading request, and outputted to a CRT 12 and a printer 13 by a data display means 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission device for transmitting data between a computer and a control device of a distributed control system composed of a plurality of computers.

[0002]

2. Description of the Related Art Conventionally, the simplest data communication system is composed of a center device, a data terminal device, and a data transmission line connecting them, and the data is transmitted to the data terminal device generated at a remote place by data transmission. The result sent to the computer of the center device via the line and processed there is again transported by the data transmission line and returned to the data terminal device to the user.

When the data communication system is roughly divided into its functions, the role of the data transmission system is to carry data, and handles binary coded digital signals on the premise of computer processing. That is, it is transmitted as a series of "0" and "1" chunks called a message. "Green window"
In a seat reservation system like this, the job of the data transmission system is to send the inquiry message entered by the window clerk to the data terminal device to the computer, and to send the data about the reserved train to the data terminal device as a response message. Is.

The role of the data processing system is to process the data in the message literally carried,
There are two types of processing, real-time processing and batch processing.

[0005] The real-time processing is a method that the data communication system is good at, which is called immediate processing or real-time processing, in which the sent data is immediately processed on the spot. A data communication system that performs real-time processing is generally called an online real-time system.

On the other hand, in batch processing, the computer puts the transmitted data in a storage (for example, a magnetic disk device) once, and after the data has accumulated to some extent, it is collectively processed, which is also called batch processing. A batch processing type data communication system is sometimes called an online batch processing system.

Next, the data terminal device is called a terminal device or simply a terminal or a terminal. Often
It is placed far away from the computer of the center device and is located at the contact point between the data communication system and the environment (human society).

The data terminal device has at least the following four functions. That is, (1) For data input, the user operates the keyboard to input alphanumeric characters or characters into the data terminal device.

(2) In data transmission, input data is converted into an electric signal suitable for data transmission and sent out to a data transmission line.

(3) In data reception, an electric signal is received from the data transmission line to restore the data transmitted by the computer.

(4) The data output conveys the received data to the user by displaying it on a cathode ray tube.

As described above, the data terminal device sends data generated in human society to the data communication system,
It acts as a window to hand over the data processed and processed in the system to human society. In a data communication system, we indirectly use a remote computer in the form of requesting a process by inputting data to a data terminal device and obtaining an output of the result.

When the user is a human, it is necessary that the human's five senses and the machine, which is a data terminal device, interact with each other (referred to as a man-machine interface) to be very good. There are many different ways that data terminal equipment can be used.

In addition to the above, the data terminal device also includes a keyboard and a printing device, and a printing device with a keyboard that can print received data, a remote batch terminal for remotely using a computer in a batch format, JNR There are various types such as the “Green window”, the window terminal at the window of a bank, or the automated teller machine that allows you to deposit and withdraw cash with a cash card.

A communication control unit (CCU: Commu)
A communication control unit is a device between the data transmission line and the central processing unit of the computer and electrically coupling them.

The communication control device examines the data received from the data transmission line for an error, and processes the data coming in one vertical column (called serial or serial) in a row (parallel or parallel) of a size that is easily processed by the computer. ). This operation is called serial / parallel conversion or serial / parallel conversion. Conversely, in response to a transmission request from a computer, parallel data is converted into serial data, and the data is arranged in a format that can be received by the destination terminal device and then transmitted to the data transmission line. Such operations are called assembling and disassembling characters.

When a large number of terminal devices are connected to the computer by different communication lines, a plurality of these communication control devices are used, or a multi-line communication control device capable of simultaneously handling data transmission of a plurality of communication lines is used.

If the computer at the center and the terminal at the remote place are connected to each other by a low-speed data transmission line, the transmission cost becomes high. So, collect terminals by region,
A multiplexing method of setting a large number of communication lines on one transmission line is adopted in a large-scale data communication system. Multiplexer (MUX: Multi) is a device that receives data from a plurality of low-speed communication lines and sends it to one high-speed line, and conversely receives a high-speed line data stream and divides it into low-speed lines.
Plexer).

The multiplexing technology has been originally developed to make an economical telephone switching network by passing a large number of telephone voice signals through one transmission line. This multiplexing technology includes frequency division multiplexing (FDM).
Division Multiplexing and time division multiplexing (TDM)
There is `` Tiplexing) ''.

As described above, in the conventional distributed control system composed of a plurality of computers, the data necessary for transmission is accessed on the computer side in the main memory of each computer, and the data required for transmission is fetched and transmitted. Data was created and transmitted to each controller.

Therefore, in the conventional data transmission system, the load on the computer side is large, and each computer needs software for the transmission function individually, so that the software cannot be standardized.

[0022]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems. In data transmission, the transmission function on each computer side is eliminated, the load on the computers is reduced, and the software for the transmission function is shared. It is an object of the present invention to provide a data transmission device capable of standardizing the software of the transmission function and the transmission trace function by placing it on the data transmission device side.

[0023]

According to the present invention, there are provided a plurality of computers constituting a distributed control system, a shared memory storing shared information shared by these computers, and a transmission request from a control device. A transmission control means for controlling transmission of transmission information; and a data editing means for exchanging control signals between the transmission control means, accessing a shared memory to extract shared information as necessary, and editing the transmission information. A data transmission device comprising data display means for displaying the data content edited by the data editing means, a trace function for displaying the data content on a CRT and a printer, and a data writing means for writing the data content in an external storage device. Is.

[0024]

In the data transmission apparatus of the present invention, the shared information shared by the plurality of electronic computers constituting the distributed control system is stored, and the transmission information is transmission-controlled by the transmission request from the control unit, and the transmission control means is provided. A control signal to and from the shared memory, if necessary, access the shared memory to extract the shared information, edit the transmission information, display the data content edited by the data editing means, and CR the data content.
T and display on the printer and write the data contents to the external storage device.

[0025]

EXAMPLE An example of the present invention will be described below. In FIG. 1, 14 and 15 are a plurality of electronic computers that constitute a distributed control system, 3 is a shared memory that stores shared information shared by the electronic computers 14 and 15, and 7 is a control device 10 or 1.
The transmission control means 7 and 4 for controlling the transmission of the transmission information in response to the transmission request from the device 1 send and receive control signals to and from the transmission control means 7, and access the shared memory 3 to extract the shared information if necessary, and transmit the transmission information. Data editing means for editing
Reference numeral 8 is a data display means for displaying the data content edited by the data editing means 4, 12 is a CRT for displaying the data content, 13 is a printer, 5 is a data writing means for writing the data content in the external storage device 6, In the data transmission between the computer and the control device of the distributed control system composed of the electronic computers 14 and 15 of the above, the control device 10 is provided with the shared memory 3 for sharing data between the plurality of electronic computers 14 and 15 and the data transmission device. , 11, the data editing means 4 accesses the data required for transmission from the shared memory 3, the accessed data is edited, and the edited data is transmitted to the control devices 10, 11 by the transmission control means 7. The transmission function for transmitting and the edited data are displayed on the CRT 12 and the printer 13 by the data display means and edited. The data writing unit 5 stores the data in the storage medium, the data reading unit 9 reads the data stored in the storage medium, and the data display unit 8 displays the read data on the CRT 12 and the printer 13. It is a data transmission device provided.
That is, in the present embodiment, by providing the shared memory 3, access between the main memories for data transmission on the computer side is eliminated, and each computer simply sets the data in the shared memory 3 without being aware of the transmission. If there is a transmission request from the control device 10, 11 in the data transmission device, the data in the shared memory 3 is edited into the transmission data, and the control device 10,
11 and transmits the transmission data to CRT1 if requested.
2. The gist is that the contents are output to the printer 13 and stored in the storage medium, and the contents of the storage medium can be output to the CRT 12 and the printer 13 upon request.

Then, the computer 14 and the computer 15
Sets the data necessary for the transmission data calculated by the computer in the shared memory 3.

If there is a transmission request, the data transmission device 16 uses the data editing means 4 to access data from the shared memory 3 and data required for transmission to either the control device 10 or the control device 11 that has made the request. Is edited, and the control device 10 requested by the transmission control means 7
Alternatively, the data is transmitted to either the control device 11.

Further, if there is a request for analysis at the time of transmission error, the data edited by the data editing means 4 is output to the CRT 12 and the printer 13 by the data display means 8. The edit data is stored in the external storage device 6 of the storage medium by the data writing means 5. If requested, the data stored in the external storage device 6 is read by the data reading means 9 and is CR by the data display means 8.
T12, output to the printer 13.

As described above, the main memory of each computer is not accessed, the transmission function on the computer side becomes unnecessary, and the computer 14 or computer 15 does not need to be aware of data transmission. Therefore, the CPU1 and CPU2 of the computer 14 and the computer 15
Load is reduced. If the software for the transmission function is also placed in the data transmission device 16, the software for the transmission function can be standardized. Since the CPU of the data transmission device 16 has only the functions described above, it may have a small capacity. Analysis at the time of transmission error can be easily performed as described above.

[0030]

According to the present invention, the conventional main memory access between computers and the transmission function on the computer side are no longer required, and the load on the computer side is reduced. Furthermore, by placing the transmission function in the data transmission device, The software of the transmission trace function can be standardized.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a data transmission device showing an embodiment of the present invention.

[Explanation of symbols]

 3 ... Shared memory 4 ... Data editing means 5 ... Data writing means 7 ... Transmission control means 8 ... Data display means

Claims (1)

[Claims] 1. A plurality of computers forming a distributed control system, a shared memory storing shared information shared by these computers, and a transmission control for controlling transmission of transmission information in response to a transmission request from a control device. Means for exchanging control signals between the means and the transmission control means, accessing the shared memory to extract shared information as necessary, and editing the transmission information; and data editing means for editing the transmission information. A data transmission device comprising: a data display unit for displaying the data content, a trace function for displaying the data content on a CRT and a printer, and a data writing unit for writing the data content in an external storage device.