JPS58201493A - Remote scanning system - Google Patents

Abstract

PURPOSE:To relieve the job load of a central processing unit of a center station, and to reduce the amount of giving and receiving of information between the center station and a remote station, by providing a memory storing the result of scanning of a terminal device of the remote station located at a remote location for the center station. CONSTITUTION:The center station consists of the central processing unit 1 and an interface device 2, and the device 2 has a memory 2c storing the information received from the remote station. The remote station has an interface device 4 having a self-control scanning function, and the device 4 scans the state of a terminal device 5. A controller 4c drives a scanner 4b in a prescribed period, fetches the state of the terminal device 5 and transmits the state to the center station via an interface 4a and a communication line 3. In the interface device 2 of the center station, the receiving data is stored in the memory 2c. Further, a controller 2d monitors also the scanning order from the central processing unit 1, and when the scanning order is received via the interface section 2a, information is read out from the memory 2c and transmitted to the central processing unit 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system in which a central processing unit of a center station scans information on a terminal of a remote stage.

Conventionally, when scanning the background of a terminal device installed in a remote stage from the central processing unit of the center station, an interface device was installed in the center stage and the remote station, and the data from the central processing unit was scanned. A method is adopted in which the message of the remote station terminal is read each time the scanning order is determined.

Therefore, after the scanning order is sent from the central processing unit until the terminal form information is sent, the processing time of the interface equipment of both stations and the terminal equipment of the remote station, and the processing time of the interface equipment of both stations and the terminal equipment of the center station and the remote station. It takes a considerable amount of time due to line delay time (round trip). Therefore, the central processing unit takes a long time to wait until a response is returned after a scanning order is generated.

This has the disadvantage of reducing the processing power of the central processing unit.

In order to solve the above-mentioned drawbacks, the center stage interface device is equipped with an autonomous scanning function, so that the center station interface device constantly scans the status of the remote station and stores the response results. A method is also known in which the central processing unit then inputs information stored in the interface device.

This reduces the burden on the central processing unit because it can receive a response without waiting time. However, since information is constantly exchanged between the interface device of the center station and remote stage 1, the amount of information exchanged is large, and the amount of hardware of the interface device increases to process it. When autonomous scanning of an interface is realized using no-aware software, the amount of software required for 1ζ is fourfold. Therefore, it cannot help but become uneconomical.

The object of the present invention is to overcome the above-mentioned drawbacks of the prior art.

To provide a remote scanning method that reduces the burden on a central processing unit and reduces the amount of information exchanged between a center station and a remote station.

The scanning method of the present invention is a remote scanning method in which the state of a terminal device of a remote station located at a remote location is scanned from a central processing unit of a center station, and the remote stage scan autonomously scans the state of the terminal device at a constant interval. and sends the scan results to the center stage 1.
Equipped with an interface device, the pre-ml center stage training is equipped with an interface device.

The central processing unit has a memory for storing scan results sent from the previous remote stage and a control unit for reading and writing to the memory, and the central processing unit reads the contents of the memory. It is important to know the status of the terminal device.

Next, the present invention will be explained in detail with reference to the drawings.

The figure is a block diagram showing an embodiment of the present invention.

That is, the center station is composed of a central processing unit l and an interface device @2, and the interface device 2 is a memory 2c+ for storing information received from a remote station; an interface g2a between the memory 2C and the central processing unit 1; It contains an interface section 2b between the memory 2C and the remote station, and a control section 2d for controlling these operations. The remote station is equipped with an interface device 4 having an autonomous scanning function, and the terminal device 5 is scanned by the interface device 4.

The interface device 4 includes a scanner 4b for scanning the terminal device 5, an interface section 4a for sending scanning information to the center station via the communication line 8, and a controller 4C for controlling these operations.

The controller 4C drives the scanner 4b at a constant interval, receives the state of the terminal device 5, and sends it to the center station via the interface section 4a and the communication line 8.

In the interface device 2 of the center station, the controller 2d is monitoring the information sent from the remote station.
When the is sent, it is sent to the upper receiver (
AI, 6 data is stored in memory 2c. The controller 2d also monitors the scanning order from the central processing unit 11, and upon receiving the scanning order via the interface section 2&, reads out the information from the memory 2C and sends it to the central processing unit 1.

In this implementation, the status of the terminal device of the remote station is always the center, station V memo I) 2c
Since the information is stored in the central processing unit 1, the central processing unit 1 can receive a response without waiting time after the scanning order is generated. That is, from the perspective of the central processing unit, the terminal device appears as if it were located inside the center station. Therefore, when the central processing unit scans the status of the terminal device, it is possible to perform the processing in the scent access time, which has the effect of reducing the burden on the central processing unit. Another remote stay 7! ! Since the center station scans autonomously, fewer processing boards are required for the center station interface device.
It is convenient to receive information from multiple remote stations with one interface device. In other words, there is an effect that the amount of hardware is small and the configuration can be made economically.

In accordance with the above L'), in the present invention, the remote station autonomously scans the status of the terminal device, and stores the status of the terminal device sent from the remote stage switch at the center stage 1 node in the memory. Since the central processing unit is configured to read the terminal-like dust from the memory, the terminal device appears to be on the center stage when viewed from the central processing unit, reducing the access time during scanning. , which has the effect of reducing the burden on the central processing unit. In addition, autonomous scanning is performed at the remote station,
Since the center stage side simply stores the information sent from the remote station, the processing amount of the interface device on the center stage 79 side is small, reducing hardware sewing and making the configuration economical. There is an effect that it can be done.

[Brief explanation of the drawing]

The figure is a block diagram showing one embodiment of the present invention. In the figure, 1: central processing unit, 2.4: interface device, 3: communication line, 6: terminal device, 2a, 2b: interface unit, 2c: memory. 2d - Control 1.4m...Interface section, 4b...Scanner, 4e...Controller. Agent: Patent attorney Toshimune Sumita

Claims (1)

[Claims] In a remote scanning method in which the state of a terminal device of a remote stage station located at a remote location is scanned from a central processing unit of a center stage station, the remote station:
The center stage includes an interface device that autonomously scans the range of the terminal device at a fixed period and sends the scan results to the center stage, and the center stage has a memory that stores the scan results sent from the remote stage. and. and a control section for reading and writing data to and from the memory, the central processing unit knowing the state of the terminal device by reading the contents of the memory.