JPS5995622A - Remote control system for disconnecting power supply - Google Patents

Abstract

PURPOSE:To disconnect power supply to an information processor under remote control securely by allowing the opposite information processing centers to confirm mutually whether a power-off indication signal and its answer signal are received by the opposite side or not. CONSTITUTION:A host-side CPU2 once sending out the power-off indication signal starts monitoring the time and waits for an answer regarding whether a power-source disconnection is possible or not from an information processor 7 for a specific time. If there is the answer within said time, it is certain that the indication signal is received by the processor 7, so the control is completed. When there is no answer, it is possible that the indication signal is not received by the processor 7 accurately, so the indication signal is sent out again and said operation is repeated. The processor 7 under remote control once receiving the indication signal checks the state of its system to judge whether the power source can be turned off or not and sends the result to the CPU2. The time is monitored after the answering and the processor performs the same operation with the CPU2. Thus, the transfer of the indication signal is performed securely.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical field of the invention The present invention is directed to a power source for an unmanned information processing device connected to a host information processing device via a communication line. This relates to a remote control method that disconnects based on instructions sent via the .

(2) Prior art and problems Figure 1 is a diagram for explaining an example of a remote control power-off system, in which 1 is an information processing center on the host side, 2 is a central processing unit, and 3 is a communication control process. equipment, 4 is a modem;
5 is a communication line, 6 is a remotely controlled information processing center, 7 is
8 indicates an information processing device, and 8 indicates a power supply unit.

In FIG. 1, a power-off instruction signal issued from a central processing unit 2 in an information processing center 1 on the host side is transmitted to a communication line 5 via a communication control processing unit 3 and a modem 4, and is remotely controlled. The information processing center 6 is reached. In the remotely controlled information processing center 6, the power-off instruction signal is demodulated by the modulator 4 in the same way as general data. When the information processing device 7 disconnects the signal and recognizes that it is a power cutoff signal, the information processing device 7 instructs the power supply unit 8 to start a power cutoff operation. At the same time, the information processing device 7 reports its own state after a certain period of time to the central processing device 2.
Begin preparations to report to.

At this time, if the power is normally turned off, the operation of the information processing device 7 is stopped, so the report to the central processing device 2 remains incomplete.

However, if the power is not turned off for some reason, a report to the central processing unit 2 is executed.

The central processing unit 2 waits for a report from the other party's information processing equipment for a certain period of time after issuing the power-off instruction signal, but if there is no report during that time, it is assumed that the power has been turned off. , If there is another report, it will be considered as a power-off failure.

The above is the operation of the conventional system. However, as mentioned above, the power-off instruction signal is sent in the form of data via a communication line, so errors often occur due to the influence of noise. , may not be accurately transmitted to the information processing device 7.

In such a case, since the information processing device 7 does not recognize that it has received the power-off instruction signal, it naturally does not instruct the power supply unit 8 to enter the power-off operation, so the power is not turned off. The information processing device 7 also does not report to the central processing device 2.

From the viewpoint of the central processing unit 2, since there is no report from the information processing device even after waiting for a certain period of time after issuing the power-off instruction signal, it is assumed that the power has been turned off normally.

Therefore, the information processing device 7 is left powered on.

As mentioned above, in the conventional method, if the power-off instruction signal issued from the host side is not correctly received by the information processing device on the other side due to the influence of noise, the power to the information processing device is turned off. However, there was a drawback in that the host side misunderstood that the connection had been disconnected.

(3) Purpose of the Invention In view of the drawbacks of the conventional system described above, the present invention provides for information processing centers facing each other to check whether the power cut instruction signal and its reply signal have been received by the other party without fail. The purpose is to ensure that the power to remotely controlled information processing devices is turned off by providing a method that allows confirmation.

(4) Structure of the Invention According to the present invention, this object is achieved by transmitting information from one of a plurality of information processing devices coupled via a communication line through the communication line. In a method in which the other information processing device receives the signal and sends a power-off instruction signal to turn off its own power, ``the information processing device that receives the power-off instruction signal immediately turns off its own power. The information processing device that has issued the power-off instruction signal is sent a reply as to whether or not the power-off instruction signal is possible, and then monitors whether the power-off instruction signal is sent again for a certain period of time. When a power-off instruction signal arrives, the same operation as when the first power-off instruction signal is received is repeated, and when the signal does not arrive and the answer is that the power can be turned off. On the other hand, if the information processing device that sent the power-off instruction signal waits for a response from the other party's information processing device for a certain period of time and there is no response, the information processing device instructs its own power supply unit to disconnect. This is achieved by a remote control system for power-off, which is characterized by sending out a power-off instruction signal.

(5) Embodiment of the invention FIG. 2 is a diagram for explaining the operation of an embodiment of the present invention, (4) is a flowchart showing control of the central processing unit 2 of FIG. ) is a flowchart showing the control of the information processing device 7 in FIG.

In FIG. 2 (4), when the central processing unit 2 on the host side issues a power-off instruction signal, it immediately starts time monitoring.
It waits for a reply from the information processing device 7 as to whether or not the power can be cut off for a predetermined period of time. If there is a response within that time, it is certain that the information processing device 7 has received the power-off instruction signal, so this control ends. If,
If no response is received, there is a possibility that the power-off instruction signal is not accurately received by the information processing device 7, so the power-off instruction signal is issued again and the above operation is repeated again.

In FIG. 2(B), when the information processing device 7 on the side to be remotely controlled receives the power-off instruction signal, it checks the state of its own system and determines whether it is possible to turn off the power. , and sends the result to the central processing unit 2.

Similar to the power cutoff instruction signal, this response is sent via the history adjustment device 4 and the communication line 5 in Figure 1.
In addition, the conditions for answering "No" include that the input/output equipment of the own system is still in operation or that local processing is being executed.

After issuing the above response, time monitoring is started, and for a predetermined period of time, it is checked to see if a power-off instruction (= symbol) is sent again from the central processing unit 2.

If the power-off instruction signal is sent again after the computer has arrived, this indicates that the central processing unit 2 on the host side has not received the response from the information processing device 7 as to whether or not the power can be turned off. It checks whether the power can be turned off, gives an answer, and repeats the above operation. If the power-off instruction signal is not retransmitted within the predetermined period of time, and if the response was that power-off is possible before then, the system instructs the power supply section of its own system to disconnect the power. If the answer is no, the process ends without instructing disconnection.

Through the above-described operation, the power-off instruction signal is reliably received and passed.

(6) Effects of the Invention According to the method of the present invention, the power-off instruction signal and its response became unclear due to noise during transmission, or the contents changed and were not judged by the other party. Even if the host side and the remote-controlled side are both aware of the situation, it is possible to reliably control the power off by repeatedly transmitting and receiving signals.

This is effective because it prevents the situation where, unlike in the past, even though a power-off instruction signal is issued from the host side, the signal is not transmitted to the information processing device on the remotely controlled side and the power is left on. is large.

Furthermore, even if the remote-controlled side does not want to turn off the power for some reason, the host side has the advantage of knowing this.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the power cutoff method 9'J by remote control, and FIG. 2 is a diagram for explaining the operation of one implementation f1j of the present invention. Flowchart of control of the device (B) is a flowchart of control of the information processing device 7 of FIG. 1... Information processing center on the host side, 2...
...Central processing unit, 3...Communication control processing device,
4...Modulator/demodulator, 5...Communication line, 6
...Remote fl! 11 controlled information processing center,
7... Information processing device, 8... Power supply section.

Claims (1)

[Claims] One of the plurality of information processing devices connected via a communication line sends a power cut instruction signal via the communication line, and the other information processing device receiving the signal cuts off its own power. In this method, an information processing device that has received a power-off instruction signal replies to the information processing device that issued the power-off instruction signal as to whether or not it is possible to immediately turn off its own power, and then waits for a certain period of time. , monitors whether the power-off instruction signal is sent again, and when the power-off instruction signal arrives, repeats the same operation as when receiving the first power-off instruction signal, and does not arrive, and the answer indicates that the power can be cut off, the information processing device instructs its own power supply unit to cut off the power, and on the other hand, the information processing device that sent the power cut off instruction signal, for a certain period of time, A remote power-off control method that waits for a response from the other party's information processing device, and if there is no response, sends a power-off instruction signal again.