JPH04257960A - Data transfer system - Google Patents

Abstract

PURPOSE:To reduce the load of a host computer and to improve the processing performance of an entire system concerning the data transfer system at an information processor connecting plural terminal equipments through a signal line to the host computer. CONSTITUTION:At plural terminal equipments 13 and 14 connected through a signal line 15 to a host computer 11, an opening/closing means 16 is provided to open/close the signal line 15, an adding means 20 is provided to add identification information showing the source and destination of transmission to a data, a discriminating means 21 is provided to discriminate the identification information, and a storing means 22 is provided to store the data.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transfer system in an information processing apparatus in which a plurality of terminal devices are connected to a host computer via signal lines. In recent information processing devices, in order to reduce the burden on the host computer and improve processing performance, various types of data, such as dictionaries and character patterns, are held independently by each terminal device. .

However, if common data is not used in different terminal devices, it is necessary for each terminal device to hold the same data.

0003

2. Description of the Related Art An example of a conventional data transfer method is shown in FIG. In FIG. 5, 1 is a host computer, 2 is a terminal control device, and 3 and 4 are signal lines 5.
This is a terminal device connected to the terminal control device 2 via. When sharing data between different terminal devices 3 and 4, the host computer 1 reads data from a specific terminal device 3 via the terminal control device 2, and transfers the read data to another terminal device 4. Alternatively, the host computer 1 may hold common data in advance and transfer the data to the terminal devices 3 and 4 as necessary.

0004

[Problem to be Solved by the Invention] However, in such conventional data transfer methods, when transferring data between terminal devices, the host computer must intervene, which places a burden on the host computer. There is a problem in that the processing performance of the entire system decreases.

The present invention has been made in view of these conventional problems, and it is an object of the present invention to provide a data transfer method that reduces the burden on a host computer and improves the processing performance of the entire system. It is an object.

[0006]

[Means for Solving the Problems] FIG. 1 is a diagram illustrating the principle of the present invention. In FIG. 1, 13 and 14 are a plurality of terminal devices connected to the host computer 11 via a signal line 15, 16 is an opening/closing means for opening and closing the signal line 15 provided in the terminal devices 13 and 14, and 20 is a transmission source. 21 is a determining means for determining the identification information; and 22 is a storage means for storing the data.

[0007]

[Operation] When data is transferred between the terminal devices 13 and 14, the signal line 15 is turned off by the opening/closing means 16, the host computer 11 and the terminal devices 13 and 14 are disconnected, and the terminal device 13 performing the data transfer is The ID is changed, added to the data, and sent onto the signal line 15.

[0008] The terminal device 14 to which the data is transferred discriminates the identification information indicating the transfer destination ID, and when it is determined that they are the same, stores the data in the storage means 22. The terminal device 14 that received the data transfer responds with the received transfer source ID as the transfer destination ID, and the terminal device 13 that transferred the data starts transferring the data when the received transfer destination ID and the transfer source ID match. It recognizes that the response is from the received terminal device 14.

[0009] In this way, data can be transferred between different terminal devices 13 and 14 without intervening the host computer 11. Therefore, the host computer 11 can perform other processing even during data transfer, and the processing performance of the entire computer system can be improved.

0010

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. 2 to 4 are diagrams showing one embodiment of the present invention. In FIG. 2, 11 is a host computer, 12 is a terminal control device connected to the host computer 11, 13,
Reference numeral 14 denotes a plurality of terminal devices connected to the terminal control device 12 via signal lines 15.

Next, the internal configuration of the terminal devices 13 and 14 is shown in FIG. In FIG. 3, 16 is a switch as an opening/closing means, and when the switch 16 is turned off, the terminal device 1
3 and 14, when the host computer 11 and the terminal control device 12 are disconnected and the switch 16 is turned on, the terminal devices 13 and 14 are connected to the terminal control device 12 via the signal line 15.
and is connected to the host computer 11. Opening and closing of the switch 16 is controlled by a control section 17.

Reference numeral 18 denotes a receiving section, and the receiving section 18 receives data. 19 is a transmitter, and the transmitter 19 transmits data. Reference numeral 20 denotes an adding section as an adding means, and the adding section 20 adds identification information indicating a transfer destination ID and a transfer source ID to data, as shown in FIG. In this case, in data transfer between the terminal devices 13 and 14, the transfer source ID is not changed to the ID of the terminal devices 13 and 14, but is changed to the ID of the terminal control device 12.

Reference numeral 21 denotes a discriminating section as discriminating means, and the discriminating section 21 discriminates the identification information received by the receiving section 18. That is, it is determined whether the ID of its own terminal device 13, 14 and the transfer destination ID are the same, and if they are the same, the data is received. Furthermore, when the transfer source ID is changed, it is determined whether the transfer source ID and the received transfer destination ID are the same, and the response from the transfer destination is recognized.

22 is a memory section as a storage means;
In the memory unit 22, when the determination unit 21 determines that the transfer destination ID and the ID of the own terminal devices 13 and 14 are the same,
Data is stored therein, and data to be transferred to other terminal devices 13 and 14 is also stored therein. The control section 17 controls each section and also controls opening and closing of the switch 16.

Next, the operation will be explained. First, a case in which data is transferred from the host computer 11 to the terminal device 13 will be described. Note that here, the terminal control device 12
ID of 00, ID of terminal device 13 is 01, terminal device 1
Let the ID of 4 be 02. Data is transferred from the host computer 11 to the terminal control device 12, and the data is transferred to the terminal control device 12.
The transfer destination ID and transfer source ID are added. Here, the transfer destination ID is 01 and the transfer source ID is 00.

Terminal device 13 connected to signal line 15
and the terminal device 14 reads the data transfer destination ID,
Only data with matching transfer destination IDs is processed. That is, since the transfer destination ID is 01, only the terminal device 13 performs data reception processing, and the terminal device 14 does not perform data processing. When the terminal device 13 processes the data and responds, it adds identification information with a transfer destination ID of 00 and a transfer source ID of 01 and sends it to the signal line 15. The terminal control device 12 selects only data with a transfer destination ID of 00 from among the data on the signal line 15, determines that the transfer source ID is 01, and recognizes that it is a response from the terminal device 13. .

Next, a case will be described in which data is directly transferred from the terminal device 13 to the terminal device 14. Terminal device 1
3 turns off the switch 16 under the control of the control unit 17;
The terminal control device 12 and the host computer 11 are disconnected. Therefore, the terminal device 13
It is disconnected from the terminal control device 12 and the host computer 11 while being connected to the terminal device 14 via the terminal device 14 .

Next, the terminal device 13 uses the addition section 20 to
Identification information having a transfer destination ID of 02 and a transfer source ID of 00 is added to the data, and the data is sent onto the signal line 15. Thereby, the terminal device 14 can receive data in the same way as when data is transmitted from the terminal control device 12. Furthermore, when responding, the terminal device 14 sets the transfer destination ID to 00 and the transfer source ID to 02, and the terminal device 13 sets the transfer destination ID to 00.
By determining that there is a response, it is recognized that there has been a response from the terminal device 14.

In this way, from the terminal device 13 to the terminal device 1
4, the transfer source ID is changed to the ID (00) of the terminal control device 12, and when the response is recognized, it is determined that the transfer destination ID is 00. Therefore, the host computer 11 and the terminal control device 12
Data transfer between the terminal devices 13 and 14 can be performed without the need for an intermediary.

As a result, the processing performance of the entire computer system can be improved.

[0021]

[Effects of the Invention] As explained above, according to the present invention, data can be transferred between different terminal devices without the intervention of a host computer, and the host computer can perform other processing even during data transfer. It is possible to improve the processing performance of the entire computer system.

[Brief explanation of the drawing]

[Fig. 1] Diagram explaining the principle of the present invention

[Fig. 2] A diagram showing an embodiment of the present invention.

[Figure 3] Internal configuration diagram of the terminal device

[Figure 4] Diagram showing the transmission data format

[Figure 5] Diagram showing a conventional example

[Explanation of symbols]

11: Host computer 12: Terminal control device 13, 14: Terminal device 15: Signal line 16: Switch (opening/closing means) 17: Control unit 18: Receiving section 19: Transmission section 20: Addition part (addition means) 21: Discrimination unit (discrimination means) 22: Memory section (storage means)

Claims (1)

[Claims] Claim 1: A signal line (1) connected to a host computer (11).
In an information processing system in which a plurality of terminal devices (13) and (14) are connected via a
), (14), an opening/closing means (16) for opening and closing the signal line (15), an addition means (20) for adding identification information indicating a transmission source and a transmission destination to data, and a determination for determining the identification information. A data transfer system comprising means (21) and storage means (22) for storing the data, and for transferring data between terminal devices (13) and (14).