JPS647530B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a terminal operation time guarantee system for guaranteeing the operation time of a terminal device in a data communication system.

BACKGROUND OF THE INVENTION When data communication is performed between a central processing unit and various terminal devices via a communication control device, certain terminal devices may perform mechanical or electrical operations specific to the terminal. This requires time, and data transmitted during this time cannot be accepted by the terminal device, so some kind of time guarantee is required on the data transmitting side.

For example, in a terminal device such as a typewriter, data transmitted to the terminal device cannot be printed during a period when an operation such as a return or a line feed is performed, so data instructing a return or a line feed, etc. is sent to the terminal device. Later, it is necessary for the data transmitting side to stop data transmission for the time required for the terminal device to perform operations such as return or line feed.

Prior Art and Problems Figure 1 shows a schematic diagram of the data communication system. In the figure, data is sent and received between a central processing unit 1 and a terminal device 3 based on a command (referred to as a command) C given from a central processing unit (CPU) 1 to a communication control unit (CCU) 2. will be held. As is well known, modem devices (M) 4 and 5 are interposed between the communication control device 2 and the terminal device 3.

Conventionally, when sending data from the central processing unit 1 to the terminal device 3 based on a command C from the central processing unit 1, the communication control device 2 analyzes the command C to determine the type of the terminal device 3 and the terminal device 3. The terminal device 3 was given a guaranteed time corresponding to the operation. This will be explained with reference to FIGS. 2 and 3. FIG. 2 shows conventional transmission data stored in a memory within the central processing unit 1. As shown in FIG. In the same figure, A, B, C, ..., F, G,
H, . . . indicate general communication data, and K is data indicating that the terminal device 3 requires time guarantee.

FIGS. 3a and 3b are data time charts when the data shown in FIG. 2 is sent from the communication control device 2 to the terminal device 3 using different commands. Third
In FIG.
The operation time of the terminal device 3 is guaranteed by keeping the terminal device 3 in a non-communication state. In Figure 3b, command C2
Data transmission is performed by , and the guaranteed operation time of the terminal device 3 is t2. The terminal device 3 may be a printer or a display, for example, but if the command C1 is an instruction to cause the printer to print, and K
When is data that instructs a line feed, the non-communication time after data K is t1, while command C2
If is an instruction to hard copy characters and graphics on the display, the no-communication time after data K is t1.
t2 is longer.

In this way, conventionally, the guaranteed operation time of the terminal device is determined for each command, which causes the following problems.

(b) A separate command must be prepared each time data communication is performed with a terminal device with a different guaranteed operation time, and a large number of command types are required.

(b) The guaranteed operation time specific to a terminal device varies depending on the type of terminal device, and even with the same terminal device, the guaranteed time varies depending on operations such as line feeds and page turns, so commands in the communication control device Control becomes complicated.

Purpose of the Invention In view of the problems in the prior art described above, an object of the present invention is to add data indicating a guaranteed operating time of a terminal device to data transferred from a central processing unit. In the terminal operation time guarantee system in communication, it is possible to guarantee any operation time of the terminal device with one type of command, and it eliminates the need for analysis of commands and transferred data in the communication control device. The object of the present invention is to simplify the control, increase the flexibility of control of a communication control device, and reduce the cost of software.

Structure of the Invention The gist of the present invention for achieving the above object is as follows:
In a data communication method in which data is sent from the central processing unit to a terminal device via a communication control device based on a command from the central processing unit, in a series of transfer data transferred from the central processing unit to the terminal device. A terminal characterized in that data indicating a guaranteed operating time value of the terminal device is added, so that the communication control device arbitrarily guarantees a mechanical or electrical operating time specific to the terminal device. The operating time is guaranteed.

Examples of the invention Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 is a diagram showing transfer data stored in the memory within the central processing unit 1 according to an embodiment of the present invention. In the same figure, A, B, C, ..., G, H,
I, . . . , P, Q, . According to the present invention, control data a, b1, and b2, which are not transmitted to the terminal device 3, are added immediately after the data K1 and K2. control data a
is received by the communication control device, the communication control device is placed in a non-communication state for a period of time specified by the data b1, b2, . . . immediately after the control data a. The control data a may be data stored in the communication control device 2 in advance, and in this case, it is generally necessary to specify it from the central processing unit 1 using an initial setting command when starting up the system. . Furthermore, although the control data a is different from the data transmitted to the terminal device 3, it may be any code that is not used in data communication with the terminal device.

FIG. 5 is a time chart when the data shown in FIG. 4 is transferred to the terminal device 3, and FIG. 6 is a flow chart showing the control operation performed in the communication control device 2 according to the method of the present invention.

The system of the present invention will be further explained with reference to FIGS. 5 and 6.

Every time the communication control device 2 receives data prepared by the central processing device 1 as shown in FIG. 4, it determines whether the data is control data a or not. ... are all transferred to the terminal device 3. When control data a is detected, data b1 or b2 to be transferred next specifies a time value tb1 or tb22, respectively, to guarantee the operation time of the terminal device 3, and the data is not sent to the terminal device 3 until that time elapses. No data is transmitted and there is no communication.
After the guaranteed time has elapsed, the communication control device 2 continues data transmission to the terminal device 3 while again determining whether the received data is the control data a.

With the above control, by simply adding data indicating the guaranteed operation time of the terminal device to the data stored in the memory of the central processing unit, it is possible to guarantee any time with one type of command, and also to control communications. In the apparatus, control is simplified because it is no longer necessary for the terminal device to discriminate the data K that requires time guarantee, which was conventionally done.

It is clear that control data a becomes unnecessary if only codes that are not used in data communication with the terminal device are used as data b1, b2, etc. indicating time values for guaranteeing operating time. .

Effects of the Invention As is clear from the above description, according to the present invention, by adding data indicating the guaranteed operating time of the terminal device to the transfer data transferred from the central processing unit, the terminal device in data communication In the operation time guarantee method, it is possible to guarantee any operation time of the terminal device with one type of command,
In addition, analysis of commands and transfer data in the communication control device becomes unnecessary, thereby simplifying control in the communication control device, increasing flexibility in controlling the communication control device, and reducing software costs.

[Brief explanation of drawings]

Fig. 1 is a schematic system diagram of the data communication system, Fig. 2 is a diagram showing conventional transmission data stored in the memory in the central processing unit, and Fig. 3 is a diagram showing the conventional transmission data stored in the memory in the central processing unit. Figure 4 is a time chart of the data in the figures; Figure 4 is a diagram showing data stored in the memory in the central processing unit according to an embodiment of the present invention;
The figure is a time chart of the data of FIG. 4 sent out from the communication control device, and FIG. 6 is a flow chart showing control operations in the communication control device according to an embodiment of the present invention. 1...Central processing unit, 2...Communication control device, 3
...Terminal device, A, B, C...General data, a...
...Control data, b1, b2...Data indicating a guaranteed value of operation time, t1, t2, tb1, tb2...Time for guaranteeing operation.

Claims (1)

[Claims] 1 In a data communication system in which data is sent from the central processing unit to a terminal device via a communication control device based on a command from the central processing unit, a series of transferred data transferred from the central processing unit to the terminal device. Data indicating a guaranteed operating time of the terminal device is added to the terminal device, so that the communication control device arbitrarily guarantees a mechanical or electrical operating time specific to the terminal device. Terminal operation time guarantee method.