JPS59205854A - System for guaranteeing operating time of terminal device - Google Patents

Abstract

PURPOSE:To guarantee an optional operating time of a terminal device by one kind of command by adding a data representing the guaranteeing value of the operating time of terminal device into a transfer data transferred from a central processing device. CONSTITUTION:A communication controller 2 decides whether a received data is a control data (a) or not at each reception of the data reserved by the central processing unit 1 and transfers data A, B other than the control data (a) all to a terminal device 3. When the control data (a) is detected, the device 2 discriminates that data b1, b2 transferred next represent time values tb1, tb2 for guaranteeing the operating time of the terminal device 3 and dose not transmit data to the terminal device 3 until the time values are elapsed to attain non- communication state. After the elapse of guaranteeing time, the communication controller 2 continues the data transmission to the terminal device 3 while discriminating whether the received data is the control data (a) or not again.

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, some terminal devices require a certain amount of time to perform mechanical or electrical operations specific to the terminal. Since data transmitted during this time cannot be accepted by the terminal device, 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 system diagram of a data communication system. In the same figure, from the central processing unit (cpU) 1 to the communication control bag %
' Based on instructions (referred to as commands) C given to the (CCU) 2, the central processing unit 1 and the terminal device 3
Data is sent and received between the two. As is well known, modem devices (M) 4 and 5 are interposed between the communication control device 2 and the terminal device 3.

Conventionally, based on the command C from the central processing unit 1,
When sending data from the central processing unit 1 to the terminal device 3, the communication control device 2 analyzes the command C to inform the terminal device 3 of the guarantee time corresponding to the type of the terminal device 3 and the operation to be performed on the terminal device 3. was giving. 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
.

Hl... indicates general communication data, and K is data meaning that the terminal device 3 requires time guarantee.

3(a) and 3(b) 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. Figure 3(a)
In , data transmission is performed by command CI, and the communication control device 2 analyzes the command CI and data K, and after transmitting the data, puts the terminal device 3 into a non-communication state for a time tl to guarantee the operating time of the terminal device 3. . In FIG. 3(b), data transmission is performed by command C2, and the guaranteed operation time of the terminal device 3 is t2. The terminal device 3 is, for example, a printer or a display, but if the command CI is an instruction for the printer to print and K is data that instructs a line feed, the non-communication time after the data is tl. On the other hand, when the command C2 is an instruction to display characters and graphics on the display, the non-communication time after data is t2, which is longer than tl.

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.1. A large number of command types are required.

(b) The guaranteed operation time specific to a terminal device differs depending on the type of terminal device, and even within the same terminal device, the guaranteed time varies depending on operations such as line feeds and page turns, making command control in the communication control device complicated. Become.

OBJECTS 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 transfer data transferred from a central processing unit. Terminal operation time guarantee method in communication O
In this case, it is possible to guarantee arbitrary operation time of the terminal device with one type of command, and it is unnecessary to analyze commands and transfer data in the communication control device, thereby simplifying the control in the communication control device and improving the communication speed. The objective is to increase the flexibility of control of the control device and reduce the cost of software.

Structure of the Invention The gist of the present invention to achieve the above object is to provide a data communication method for transmitting data from a central processing unit to a terminal device via a communication control device based on a command from the central processing unit. Data indicating a guaranteed operating time of the terminal device is added to a series of transfer data transferred from the processing device to the terminal device, so that the communication control device Guaranteed operating time and work hours! Embodiments of the Invention Below, embodiments of the present invention will be described 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 figure, A, B, C,...,G.

H, I, ..., P, Q, ... are general data transferred to the terminal device 3, and Kl, 2 means that the terminal device 3 requires guaranteed operating time. It is data. According to the present invention, data K1. to 2
Immediately after, control data a, b that is not transmitted to the terminal device 3
l and b2 are added. When control data a is received by the communication control device, data b immediately after control data a is
1. b2. ... will be in a no-communication state for a specified period of time.

The control data a may be data stored in the communication control device 2 in advance, and in this case, it is generally specified from the central processing unit 1 using an initial setting command when starting up the system. good. Also, the control data a is the terminal device 3.
Any code may be used as long as it is different from the data transmitted to the terminal device, but is not used for 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 scheme 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.
, . . . are all transferred to the terminal device 3. control data a
When detected, the data b1 or b2 to be transferred next specifies a time value tbl or tb2, 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 transmission is performed 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 perform arbitrary time guarantee with one type of command. In the communication control device, there is no longer a need for the terminal device to determine which data requires time guarantee, which has been done in the past, thereby simplifying the control fffll.

data bl indicating a time value for guaranteeing operation time;
b2. . . , etc., it is clear that the control data a becomes unnecessary if only codes that are not used in data communication with the terminal device are used.

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 can In the operation time guarantee method, it is possible to guarantee the arbitrary operation time of the terminal device with one type of command, and there is no need for the communication control device to analyze commands and transfer data, thereby making it possible to control the control going to the communication control device. Simplification increases control flexibility of the communication control device 1. The price of rough one-wear wear will be reduced.

[Brief explanation of the drawing]

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.
4 is a diagram showing data stored in the memory in the central processing unit according to an embodiment of the present invention. FIG. 5 is a time chart of the data shown in FIG. 4 sent from the communication control device. A time chart, and FIG. 6 is a flowchart showing control operations in a 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, bl, b2... Data indicating guaranteed value of operating time, t 1. t2. tbi, tbz...time to ensure operation.

Claims (1)

[Claims] (2) 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 transfers from the central processing unit to the terminal device. Data indicating a guaranteed value of the operation time of the terminal device is added to the data, so that the communication control device arbitrarily guarantees a mechanical or electrical operation time specific to the terminal device. A device operating time guarantee method.