JPH0423290B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a communication control system in an information processing system equipped with a display terminal such as a CRT.

In an information processing system equipped with a CRT terminal, conventional control macro commands related to CRT control include, for example, CRT address control commands, display or input commands, and screen modifications (blink, inversion, 1/2 brightness etc.) It is done by command.

(B) CRT address control instruction CNTL DAD n ₁ , n ₂ CNTL IAD n ₁ , n ₂ CNTL ADR Address storage area address (B) Display instruction...DISPLAY display data (C) Input instruction...INPUT input data storage area address (Ni) ) Display and input commands…ACCEPT display data,
Input data storage area address (e) Framing, flag display command...CNTL command In the above command, "CNTL" is a control command,
"DAD" indicates display addressing, _n1 indicates row address, _n2 indicates column address, and "IAD" indicates input addressing.

When a CRT screen control program is created using the above command system, address control commands and display or input commands are instructed in a paired sequence as shown in FIG. Therefore, when executing a program programmed according to the above sequence, no problem will occur in a stand-alone type computer system, but when processing a CRT terminal via a line (including a private line), as shown in Figure 2. With the main body system as shown in
Communication with the CRT terminal requires a total of four communications: CNTL transmission/response and DISPLAY transmission/response, resulting in a large number of communications and a problem of slow processing speed.

The present invention has been made in view of the above points, and
A CRT address control command does not have much meaning by itself, but has meaning when a subsequent display or input control command is issued.

Therefore, when controlling a CRT terminal via a line, by processing the CRT address control command and display or input control command as a pair and processing them in one transmission, the number of communications on the line is reduced to two times for transmission/response. The purpose of the present invention is to provide a communication control method that can reduce the amount of communication required to 1/2 that of conventional methods and improve processing speed.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 3, reference numeral 11 denotes a main computer, which is equipped with a program memory 12 and a screen control command synthesis section 13 for synthesizing problem programs read from the program memory 12. The problem program written in the program memory 12 generally means a user-created program, such as an application program, and is a program other than an OS (operating system). In addition, the screen control command synthesis unit 13, as will be described in detail later,
It combines a CRT address control command and a display or input control macro command, and outputs the combined command to the communication control device 14. This communication control device 14
performs data communication control for the CRT terminals 15 ₁ to 15n via lines.

Next, details of the screen control command synthesis section 13 will be explained with reference to FIG. In FIG. 4, 21 is an instruction judgment section, and the program memory 1
The content of the program read from 2, that is, the instruction, is determined, and if it is a CRT address control instruction, it is sent to address save memory 22 and stored. Further, if the instruction determining unit 21 determines that the input program is a display or input command, the instruction determining unit 21 transfers the command to the control buffer 2.
3 and address save memory 22.
The CRT address control command saved in is read out to the control buffer 23. The control buffer 23 combines and stores the CRT address control command and display or input command, and sends the stored contents to the communication control device 14. Further, if the instruction determining unit 21 determines that the program from the program memory 12 is neither a CRT address control command, a display command, nor an input command, processing for that command is performed.

Next, the operation of the above embodiment will be explained with reference to the flowchart of FIG. The main computer 11
When giving an instruction to the CRT terminals ₁₅₁ to _15o , the problem program is read from the program memory 12, and first, the instruction judgment section 21 executes the program as shown in step _S1 in FIG.
Determine whether it is a CRT address control command.
In step _S1 , if it is determined that the command is a CRT address control command, the process advances to step _S2 , and the address data for that command is set in the address save memory 22. (The address save memory 22 is reset at the start of the problem program or by a screen clear command.) After that,
The next instruction is read from the program memory 12, and the process returns to step _S1 to determine whether the instruction is a CRT address control instruction. If it is not a CRT address control command, the instruction determining section 21 further determines whether it is a display command or an input command as shown in step _S3 . In this step _S3 , if it is determined that the command is not a display command or an input command, the process advances to step _S4 , and control for that command is performed. At step _S4 , the contents of the address save memory 22 are held as they are while the process is being performed. or,
If it is determined in step _S3 that the command is a display command or an input command, the process proceeds to step _S5 , where it is determined whether address data is added to the command. If no address data has been added, the process advances to step _S6 , where the contents of the address save memory 23 are transferred to the control buffer 23, and the request command at that time is sent to the control buffer 23, as shown in FIG. Synthesize. Thereafter, the contents of the address save memory 22 are updated as shown in step _S7 according to the needs of the system configuration (for example, when displaying continuously without specifying an address). Next, proceed to step _S8 , and control buffer 23
Sends the contents held in to the communication control device 14.
Request communication to CRT terminals 15 ₁ to 15 _o . If it is determined in step S5 that address data is added to the request command, the process immediately proceeds to step _S8 and outputs the request command to the CRT terminals ₁₅₁ to _15o .

As described above, according to the present invention, when controlling a display terminal such as a CRT via a line, a display terminal such as a CRT or the like display address control command and a display or input control macro command are combined into one pair.
The number of communications on the line can be reduced to 1/2 compared to the conventional method, improving processing speed and line efficiency, and is effective when controlling multiple terminals. is especially large.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an example of a problem program in communication control, Fig. 2 is a diagram showing conventional communication frame processing, Fig. 3 is a block diagram showing one embodiment, and Fig. 4 is a screen control command in Fig. 3. FIG. 5 is a block diagram showing the details of the synthesizing section, FIG. 5 is a flowchart showing the operation, and FIG. 6 is a diagram showing communication frame processing. 11...Main computer, 12...Program memory, 13 _... Screen control command synthesis unit, 14...Communication control device, _151-15o ...CRT terminal.

Claims (1)

[Claims] 1. In an information processing system that controls a display terminal such as a CRT via a line, when transmitting a control command, the display address control command for the CRT, etc. is temporarily saved in memory, and then when transmitting a display command or an input command. , a communication control system characterized in that the control command is read from the memory and transmitted together to the terminal.