JPS61210457A - Communication control system - Google Patents

Abstract

PURPOSE:To carry out an efficient and rapid information exchange with simple control by providing a calling indicating interruption signal in receiving a calling signal on a line in a modem connected to a public telephone line network (line). CONSTITUTION:When a modem 12 receives a calling signal from other terminal 13 through a network control unit NCU 11 and a public line network (line) 10, a calling indicating interruption signal (CI interruption) is generated from the modem 12. When a processing device 14 detects the CI interruption by a check of the CI interruption through a timer routine, it erects a CI interruption flag and displays 'existence of receipt' on a display device DP for a fixed time till a predetermined time out. The receipt of the CI interruption thereafter is temporarily stopped, a job executing at present is completed and communication processing with the terminal 13 is carried out. Thereby, information exchange between the device 14 and the terminal 13 can be done efficiently and rapidly with a comparative simple control.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a communication control method for a system in which a processing device exchanges information with other terminal devices on a public telephone line via a modem, and particularly relates to a communication control method for a system in which a processing device exchanges information with other terminal devices on a public telephone line via a modem. The present invention relates to a communication control method suitable for use in a system to which an on-board personal computer or similar device is connected.

[Technical background of the invention and its problems]

In recent years, with the spread and multi-functionality of personal computers, various simple communication means for connecting personal computers to TT communication lines have been developed.

Conventionally, a personal computer equipped with a single-task operating system is connected to a public telephone line via a modem (MODF) and a network control unit (NCU), and information is exchanged with other terminal devices on the same line. When making calls, the calls are made and received manually, and after the call is made by an operator, the operator loads a communication program to make it ready for receiving calls. Therefore, in the past, there was a problem in that the operational burden on one rotor was too high and quick and efficient control could not be expected. [Object of the Invention] The present invention was made in view of the above circumstances. An object of the present invention is to provide a communication control method that allows information to be exchanged efficiently and quickly with simple control in a communication system that connects processing devices such as internal computers.

[Summary of the invention]

The present invention provides a modem connected to a public telephone line with means for receiving a calling signal on the line and generating a call instruction interrupt signal, and a processing device such as a personal computer connected to the modem. , a means for loading a communication program onto the memory, and a means for displaying "incoming call" for a period of time until a preset timeout after receiving the above-mentioned call instruction interrupt signal is provided, and the above-mentioned "incoming call" is displayed. This is a configuration in which the processing device exchanges data with another terminal device via the line by interrupting the program currently being processed and starting the communication program within the period. This allows information to be exchanged efficiently and quickly via communication lines with simple control.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the overall system configuration in an embodiment of the present invention. In the figure, 10 is a public telephone line network serving as a data communication path, hereinafter simply referred to as a line.
is an NCU (network control unit) connected to the above line 10,
12 is a modem connected to NCU J 1.
). This modem 12 is connected to the NCU 11 and a terminal device C connected to the same line 10 via the line 1θ.
By receiving a calling signal (calling signal) from 13 (hereinafter referred to as another terminal), it outputs a calling instruction interrupt signal called a CI interrupt. 14 is the modem 12 and NCU J 1
This is a processing device connected to the line 10 via a personal computer, hereinafter referred to as a personal computer equipped with a single-task operating system. This PCl
4 has an interrupt checking mechanism consisting of a timer routine that checks CI interrupts at regular intervals, as shown in FIG. Furthermore, with this CI interrupt check mechanism, C
When an I interrupt is detected, as shown in FIG. 4, "incoming call" is displayed on the display device DP after a certain period of time until a preset timeout occurs. Within this display period, the author saves the contents of the program counter of the job currently being executed (Job1), and after completing the job, transfers control to the communication program (Job2).

FIG. 2 shows a map on the main memory in the PCl4, where storage area 2 for DoS (disk operating system), storage area 22 for the program to be processed (Job 1), etc. are secured. At the same time, a storage area 23 for the communication program (Job 2) is secured, and the communication program (Job 2)
) is assumed to be loaded in advance under the control of DoS at system startup.

FIG. 3 shows a timer routine for checking the above-mentioned CI interrupt in PCl4.Te1. Cocoteha checks for CI interrupts every 20 m gsc,
When a CI interrupt is detected, the CPU interrupt flag (CIF)
4, and displays "Incoming call" on the display device DP for a preset time until the timeout expires, as shown in FIG.

Figure 4 shows the processing flow when "incoming call" is displayed on the display device DP due to the CI interrupt flag (CIF), and "incoming call" is displayed until the preset timeout. The device DPK is displayed, and in the meantime, the fourth rater finishes the currently executing job (processing in Jobl) and starts the preloaded communication program (Jobl).
b2) By applying K activation, Pc14 connects to line 1.
Information is exchanged with other terminals via ゜.

Here, the operation of one embodiment will be explained with reference to the above figures.

Here, at the time of system start-up, a communication program (Job 2 ) is preloaded and stored in the main memory of the PCl4 under the control of the 1DO8 as shown in FIG.

PCl4 is executed at a certain timing (here, 20
m5ec), a CI interrupt is checked by the timer routine shown in FIG.

At this time, when the modem 12 receives a calling signal from another terminal 13 via the NCU l 1 and the line 10, the modem 12
A CI interrupt occurs due to the CI interrupt being checked by the timer routine shown in Figure 3 above.
When all I-interrupts are detected, the CI interrupt flag (CIF) is set, and "1 incoming call" is displayed on the display device DP for a certain period of time until the preset timeout is reached, and reception of subsequent CI interrupts is temporarily prohibited. Then, the process shown in FIG. 4 begins. First, the currently running job (Job 1
), and then the job (Job2) previously loaded in the main memory area 23, that is, the job (I
Transfer control to the f program. Thereby, communication processing with other terminals 13 is executed under the control of the communication program.

Then, just before the processing of the communication program (Job 2) ends, the same program sets the CI interrupt flag (
CIF) lReset and disable CI interrupts,
End communication processing.

With such a communication control mechanism, information can be quickly exchanged between the KPC'J4 and the other terminal 13 with a relatively simple control mechanism.

In this embodiment, the communication program (Job 2) is loaded into the main memory when the system is started up, but if it takes a relatively long time to time out, prepare multiple types of communication programs and load them into the main memory when starting the system. It is also possible to select an arbitrary communication program, load it, and start it each time the message "Incoming call" is displayed.

〔Effect of the invention〕

As detailed above, according to the communication control system of the present invention, a modem connected to a public telephone line is provided with means for receiving a calling signal on the line and generating a calling instruction interrupt signal. means for loading a communication program into the memory of a processing device such as a personal computer connected to the DM, and means for displaying "incoming call" for a period of time until a preset timeout occurs after receiving the above-mentioned call instruction interrupt signal. By setting the above-mentioned and interrupting the program currently being processed within the display period of "incoming call" and starting the above-mentioned communication program, the above-mentioned processing device can communicate with other terminal devices via the above-mentioned line. By adopting the configuration for data exchange, information can be exchanged efficiently and quickly via the optimized line with simple control.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Figure 1 is a block diagram showing the system configuration, Figure 2 is a diagram showing a memory map on the main memory, and Figures 3 and 4 are the main parts of the processing. It is a figure showing a flow. 10...Public telephone network (line), 11...NCU
(Network control device), 12...Modem (MODEM), 1
3...Terminal device (other terminal), processing device (personal computer), DP...display device, Job2...
communication program.

Claims (1)

[Claims] In a system in which a processing device exchanges information with other devices on a public telephone line via a modem, the modem receives a call signal from another device via the public telephone line. means for generating a call instruction interrupt signal; the processing device includes means for loading a communication program into main memory; has a means for displaying "incoming call" for a period of , and by terminating the job being executed and starting the communication program within the display period of "incoming call", the processing device A communication control method characterized by exchanging information with the other devices mentioned above.