JPS6210749A - Condition control system - Google Patents

Abstract

PURPOSE:To decrease load by providing an extension reading/writing command at a host computer, reading without awaiting the response at the time of the necessity of a condition information and data of a station device and returning the condition information and the data without awaiting the response at the time of the unnecessity. CONSTITUTION:At a host computer 1, the displaying device name of a displaying device, a cursor address and buffer registers 1-3 and 1-4 to store the condition information data are provided. By saving the contents of a memory 21 to an information saving area 1-2 through the buffer register 1-3 together with the device name, a displaying device 2-1 returns to the initial condition and the use for another purpose is executed. When the use is temporarily completed, the host computer 1 sends the extension writing command in order to recover the condition of the displaying device 2-1. Thus, the condition information of the station is very easily controlled and the load of the memory area and the host computer is decreased.

Description

[Detailed Description of the Invention] [Summary] This is a state control method in which the host computer saves the state information and data of each station device using an extended read command without responding when necessary, and responds when unnecessary. The state information and data are sent back by an extended write command without any delay, thereby making it possible to reduce the load on the host computer without constantly holding the state information and data of all stations.

(Industrial Field of Application) The present invention relates to a state control method in which a host computer does not always maintain state information and data of all station devices in a system in which a plurality of station devices are connected to a host computer.

2. Description of the Related Art In fields such as communications and information processing, systems in which a plurality of station devices are connected to one host computer and exchange data are widely used.

In recent years, station devices have become more sophisticated, and the state of the station device can be easily changed by instructions (commands, orders) from a host computer.

Therefore, the host computer must store all status information and data of each station device and manage the status of the station devices.

As a result, the amount of management data has become enormous, increasing storage space and increasing the load on host computers. Therefore, there is a need for a state control system that can be easily managed.

[Conventional technology]

The conventional system is configured as shown in FIG.
2-1 to 2-4). The host computer 1 stores status information and data of each station device (2-1 to 2-4) in a storage area 1-1. Since the information of all the station devices is stored, the capacity of the storage area becomes enormous.Furthermore, since the host computer checks the data, a large amount of data causes an inconvenience in that the load on the host computer increases.

Using the conventional system, the operation when you want to make the program in operation on the station device 2-1 (hereinafter referred to as display device 2-1) in a state where it can be used by another program will be explained using FIG. do.

Assuming that the host computer 1 temporarily uses the screen information (AI) of the display device 2-1 (1), the host computer 1 displays a response signal containing the status information of the device 2-1 in the storage area 1-1. The data is sent to the memory 21 of the device 2-1 (2). The display device 2-1 sets the current state information and the sent state information in the memory 21, and responds to the host computer 1 regarding whether or not this is possible (3).

The host computer I, which received the yes response, issues a read command (4). With this command, display device 2
-1 through buffer registers 1-2 to storage area 1
- Save the (love) data to the data save area of 1.

When using the display device 2-1 for other purposes, the host computer 1 sets the status information to be used in the memory 21 (5).

When host computer 1 finishes this temporary use (6
), and sends the old status and other information of the storage area 1-1 to the memory 21 in order to restore the original operating state (emulation mode) (7). Depending on the enable state of the display device 2-1, the save data 8 in the save area of the screen of the display device 2-1 is sent (written) to the memory 21 (8).

After data writing is completed, a response is sent to write the status information to be used into the memory (9). This completes the restoration of the temporarily saved state.

Therefore, in the conventional system, responses are repeated and a confirmation operation is required each time the status information is received or passed, increasing the load on the host computer.

[Problem that the invention seeks to solve]

The conventional method requires a large storage capacity and has the problem of increasing the load on the host computer.

The present invention was created in view of the above points, and an object of the present invention is to provide a state control method that can reduce the load on a host computer.

[Means for solving problems]

The system of the present invention is equipped with an extended read/8-inclusive command in a host computer, reads status information and data from a station device without waiting for a response when necessary, and returns status information and data when unnecessary without waiting for a response. It is configured to do so.

[Effect]

Using the extended read command, the host computer can read and temporarily save state information and data when the state information is needed, and when it is not needed, send the saved state information and data back to the station device using the extended write command. Since the state information is controlled by the system, there is no need to check it, there is no need to increase the storage area, and the load on the host computer can be reduced.

〔Example〕

FIG. 1 shows an embodiment of the present invention, in which a host computer 1 provides an information save area 1-2 in a storage area 1-1. In this information save area 1-2, state information to be temporarily saved and data to be saved are stored for each station device (display device).

Furthermore, the host computer 1 contains the display device name and cursor address of the display device.

Condition information (monochrome/3 colors/4 colors.

basic/extended mode, alphanumeric/kanji, emulation mode, etc.), buffer for storing data, register 1-
3.1-4 is provided.

When the host computer 1 attempts to temporarily use the screen of the display device 2-1 (1), the host computer 1 sends an extended read command to the display device 2-1.
(2). The display device 2-1 stores the contents of the memory 21 together with the device name in the buffer register 1-3.
(3).

Therefore, the display device 2-1 returns to its initial state and is used for another purpose. When this temporary use ends (4
), the host computer 1 has a display device 2-1
An extended write command is sent to restore the state. By this transmission, the status information and data in the information save area are stored in the memory 21 of the display device 2-1 via the H7F register 1-4.

Although the above explanation was made using the display device 2-1, it goes without saying that any other display device may be used without any problem.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to control station status information extremely easily, and the load on the storage area and host computer can be reduced, which is extremely effective in practice. .

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a block diagram of a conventional system, and FIG. 3 is a block diagram of a conventional control system. In the figure, 1 is the host computer, 1-1 is the storage area, ■-2 is the information save area, and 2 is the station i/lEg.
smu awakening j Pk'7-Dw7rlJ Fig. 1 1 Host copy λ repeater μ, Nmata tem's undisplayed town No. 2 Fig. 1) Benkata 2f 0゜71st Fig. 3

Claims (1)

[Scope of Claims] A system in which a host computer (1) and a plurality of station device groups (2) are connected to exchange information, wherein the host computer (1) is provided with extended read/write commands, and the station devices Read the status information (2-1) and data (2-2) of group (2) when necessary without waiting for a response, and save the status information (2-1) and data (2-2). At the same time, when the status information (2-1) and data (2-2) of the station device are no longer needed, the status information (2-1) and data (2-2) can be written without waiting for a response. A state control method characterized in that data is sent back to the station device.