JPH01112893A - Action switching control system for electronic equipment - Google Patents

Abstract

PURPOSE:To easily execute the operation switching control of electronic equipment and to cheaply construct it by detecting the presence and absence of a carrier signal on a signal line by a switching command signal sent from a host computer. CONSTITUTION:When the power source of electronic equipment 1 is supplied, a host computer 4 outputs a transmission request signal as a power source supply command to a first modem 5. The first modem 5 sends a carrier to a second modem 7 is accordance with the transmission request from the host computer 4. A carrier detecting signal 12 from the second modem 7 is inputted to a modem control circuit 14, an input signal is outputted to a power source device 2 and the power source of the electronic equipment 1 is supplied. When the power source of the electronic equipment is interrupted, the host computer 4 stops the transmission request signal. Thus, an interrupting signal is outputted from an electronic equipment control device 13 and the power source of the electronic equipment 1 is interrupted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an operation switching control system for electronic equipment that switches and controls the operation of electronic equipment based on commands from a host computer located at a remote location.

[Prior Art] Fig. 2 is a block diagram showing a conventional operation switching control method for electronic equipment. device, (3) is an automatic operation device, (4) is a host computer that commands the power on/off of electronic equipment (1), and (5) is a host computer (4).
), (6) is the signal line, (7
) is a second modem connected to the automatic driving device (3), (
8) is a line interface that connects signals from the modem (7), (9) is a microprocessor, (10) is a memory that stores programs and data used by the microprocessor (9), and (11) is a microprocessor ( 9
) is a contact output circuit that outputs an on/off signal for the power supply device (2) according to instructions from the controller.

Next, the operation will be explained. When powering on the electronic device (1), a power-on command from the host computer (4) is sent to the first modem (5), signal line (6), and second modem (2) according to a predetermined protocol. 7) is transmitted to the line interface (8) of the automated driving device (3).
) as a signal. In order to process this signal, the microprocessor (9) reads out a pre-stored control program from the memory (10) and decodes that it is a power-on command.

Turn on the contact output of the contact output circuit (11). When the turned-on contact output is transmitted to the power supply device (2), the power supply device (2) executes a power-on process and starts supplying power to the electronic device (1).

The power cutoff process is executed by transmitting a cutoff command signal from the host computer in the same manner as described above.

[Problems to be solved by the invention] Since the operation switching control of conventional electronic equipment is performed by an automatic driving device as described above, it is necessary to install a microprocessor, memory, etc., and the configuration is complicated and expensive. This invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a simple and inexpensive operation switching control system for electronic equipment.

[Means for Solving the Problems] The operation switching control method for electronic equipment according to the present invention sends a carrier signal from the first modem to the signal line in response to the sending of a switching command signal from the host computer. The electronic device is switched to the first state by the detection of the carrier signal by the second modem, and the electronic device is switched to the second state in response to the non-detection of the carrier signal of the second modem due to the stop of sending the switching command signal from the host computer. This configuration is configured to switch between states.

[Function] In the operation switching control method for electronic equipment according to the present invention, a carrier signal is sent to a signal line in response to a switching command signal sent from a host computer, and the presence or absence of a carrier signal on this signal line is detected to control electronic equipment. The operation of the device, for example, turning on/off the power, can be switched.

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

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, (1) is an electronic device to be controlled, (2) is a power supply device for the electronic device (1), and (4) is an electronic device. (1) is the host computer that commands the power on/off; (5) is the first modem that is connected to the host computer (4) and converts the power on command signal into a carrier signal; (6) is the signal line , (7) is a second modem that detects a carrier signal on the signal line (6) and outputs a carrier detection signal (12), (13) is an electronic equipment control device, (14) is a modem control circuit, (15) ) is a contact output circuit that outputs an on/off signal for the power supply (2) in response to a signal from the modem control circuit (14), and (16) is a contact output circuit between the second modem (7) and the modem control circuit (14). Intervening control signals.

Next, the operation will be explained. When powering on the electronic device (1), the host computer (4) uses the first modem (5)
A transmission request signal is output as a power-on command to the device.

On the other hand, the modem control circuit (14) sends a control signal (16) to the second modem (7) so that it is always ready for reception, so the first modem (5) responds to transmission requests from the host computer (4). A corresponding carrier (carrier wave) is sent to the second modem (7) through the signal line (6). A carrier detection signal (12
) is output to the modem control circuit (14), and the modem control circuit (14) that has received the carrier detection signal (12) outputs a turn-on signal to the power supply device (2) via the contact output circuit (15). The electronic device (1) is powered on.

In addition, when shutting off the power to the electronic device (1), if the host computer (4) stops sending the transmission request signal as a power cut-off command, the electronic device control device (13) sends the power A cutoff signal is output to (2), and the power to electronic device (1) is cut off.

In addition, in the above embodiment, a power on/off command was shown as a command to switch the operation of the electronic equipment from the host computer, but other commands for operating the electronic equipment, such as a strong/weak operation switching command, may also be used. good.

[Effects of the Invention] As described above, according to the present invention, a carrier signal is sent from the first modem to the signal line in response to the sending of a switching command signal from the host computer, and the carrier signal is transmitted to the signal line by the second modem. The configuration is such that the electronic device is switched to the first state upon detection, and the electronic device is switched to the second state in response to non-detection of the carrier signal of the second modem due to stoppage of transmission of the switching command signal from the host computer. The operation switching control of electronic devices can be easily performed and can be configured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
The figure is a block diagram showing a conventional operation switching control method for electronic equipment. In the figure, (1) is an electronic device, (2) is a power supply device, (
4) is a host computer, (5) is a first modem, (6) is a signal line, (7) is a second modem, (13) is an electronic equipment control device, (14) is a modem control circuit, (15) is a ) is a contact output circuit. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (2)

[Claims] (1) The switching command signal sent from the host computer,
In an electronic device operation switching control method that switches and controls the operation of an electronic device in response to reception via a first modem, a signal line, and a second modem, A carrier signal is sent from the first modem to the signal line, and upon detection of this carrier signal by the second modem, the electronic device is switched to the first state, and the transmission of the switching command signal from the host computer is stopped. An operation switching control method for an electronic device, characterized in that the electronic device is configured to switch to a second state in response to non-detection of a carrier signal of the second modem. (2) The first state of the electronic device is a power-on state, and the second state is a power-off state.
Operation switching control method for electronic equipment described in Section 1.