JPS5958534A - Remote scanning system - Google Patents

Abstract

PURPOSE:To reduce the processing of a center station by reporting change information on a terminal state to a center station only when the change in terminal state is made. CONSTITUTION:A controller 4C drives a scanner 4b at a constant cycle to read the state of a terminal device 5 and a change in scanning information is detected; only when the change is found, change information is sent out to the center station 10 through an interface 49 and a communication circuit 3. In the interface 2 of the station 10, the controller 2d monitors the information from the remote station 11 and receives the information through the interface 2b when the information arrives to store the receiving data in a memory 2c. The controller 2d monitors scanning order from a central processing unit 1 as well, and reads the information out of the memory 2c when receiving the scanning order through 2a to send it out to the processing unit 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remote scanning method in which the state of a terminal device of a remote station installed in a remote location is scanned by a central processing unit of a center station.

Conventionally, when scanning the status of a terminal device installed in a remote station such as a medium-heat processing device in a center station or a remote station, an interface device is provided in each of the center station and the remote station.
A system is adopted in which the status 41 of the remote station terminal is read each time according to a scanning order from the central processing unit. Therefore, after the scanning order is sent from the central processing unit and until the remote station terminal status information is sent, the processing time of the interface devices of both stations and the terminal device of the remote station, and the This method requires line delay time between stations, and it is necessary to perform remote station terminal scanning processing using these times as parameters, which has the drawback of reducing the processing capacity of the central processing unit.

In order to solve the above-mentioned drawbacks, the interface device of the center station is equipped with an autonomous scanning function to constantly scan the status of remote stations and store the response results, and the central processing unit stores them in the interface device. Methods for capturing information are also known. 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 center station and remote station interface equipment, the amount of 1a information increases, and the amount of hardware required for the interface equipment to process it increases. If the scanning is realized by software in the interface device, the software will be most important. Therefore, it has to become uneconomical.

The present invention has been made in view of the above-mentioned conventional circumstances, and
SUMMARY OF THE INVENTION It is therefore an object of the present invention to overcome the above-mentioned drawbacks of the prior art and to
It is an object of the present invention to provide a new remote scanning method that can reduce the burden on a central processing unit and reduce the amount of information exchanged between a center station and remote stations.

In order to achieve the above object, 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. an interface device that autonomously scans at a constant cycle, detects a change between the previous cycle scan result and the current cycle scan result, and sends change information (scan result) to the center station only when there is a change. , the center station is configured to include a memory for storing scan results sent from the remote station, and a control section for controlling writing IIc output to the memory, and the central processing unit reads the contents of the memory. The present invention is characterized in that the state of the terminal device is known by reading it.

Next, a preferred embodiment of the present invention will be explained in detail with reference to the drawings.

The figure is a block diagram showing one embodiment of the present invention. The center station 10 is composed of the central processing unit 1 and the interface unit 2. The interface unit 2 includes a memory 2c1 for storing the 1# information received by the remote station, an interface section 2a between the memory 2c and the central processing unit 1, and a memory It incorporates an interface section 2b for connecting to the 2C remote station and a control section 2d for controlling these operations. The remote station 11 is equipped with an interface device 4 having an autonomous scanning function, and the status of the terminal device 5 is scanned by the interface device 4. interface device i
? t' 4 is a scanner unit 4b for scanning the terminal device 5;

It consists of an interface section 4a that sends scanning information to the center station via the communication line 3, and a controller section 4c that controls these operations. Controller part 4
c reads the state of the terminal device 5 by driving the scanner 'FSVJ4b at regular intervals, detects changes in the scanning information,
Only when there is a change, change information is sent to the center station 1o via the interface section 4a and the communication line 3.
Send to.

Center station 1o interface device h2
Tech, controller 2d is remote station J1
It monitors the arrival of the new update report, and when the 1# report arrives, it is received via the interface section 2b, and the received data is stored in the memory 2C. The control section 2d also monitors scanning orders from the central processing unit 1, and when receiving a scanning order via the interface section 2a, reads out information from the menu 2C and sends it to the central processing unit 1.

As explained above, the present invention autonomously scans the status of a terminal device on the remote station side, stores the status of the terminal device sent from the remote station on the center station side in memory, and centrally processes the status of the terminal device. Since the device is configured to read the contents of the memory, the terminal device appears to the central processing unit as if it were located at a center station, reducing access time during scanning and reducing the burden on the central processing unit. It has the effect of

In addition, autonomous scanning is performed on the remote station side, and change information is reported to the center station only when the terminal status changes, rather than reporting the results to the center station every time the scan is performed. In other words, it is possible to process a large number of terminal states of remote stations.

[Brief explanation of the drawing]

The figure is a block diagram showing one embodiment of the present invention. III... Central processing unit, 2.4... Interface device, 3... Communication line, 5... Terminal device, 2a,
2b...interface section, 2C m-memory,
2d...control section, 4a...interface section, 4b...scanner, 4c/1 controller Patent applicant: NEC Corporation Representative Patent attorney: Yuta Kumagai

Claims (1)

[Claims] In 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, the remote station:
The center station includes an interface device that autonomously scans the state of the terminal device at a constant cycle and sends change information between the previous cycle scan result and the current cycle scan result, and the center station has a memory that stores the scan results sent from the remote station. and a control unit that controls reading and writing to the memory, wherein the central processing unit learns the state of the terminal device by reading the contents of the memory.