JPS63113714A - Communication network for closed area - Google Patents

Abstract

PURPOSE:To ensure an independent remote control for the power supply of a terminal equipment connected to a communication line, by monitoring the communication line via a communication controller and turning on and off a power supply switch unit with the power supply control signal received from the communication line. CONSTITUTION:The communication controllers 1a-1c contain so-called transceivers and interfaces that receive signals transmitted via a communication line 5 and send signals onto the line 5, microprocessors which control transfer of signals, memories, etc. Then the controllers 1a-1c receive the power supply control signals from other terminal equipments via the line 5 and deliver the corresponding indications to power supply switch units 3a-3c. Thus these switches 3a-3c turn on and off the switches 6 set between power supplies 4a-4c and power supplies 2a-2c.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a closed communication network in which the power of a terminal device connected to a communication line is remotely controlled.

[Conventional technology]

In a closed communication network where users are restricted to a certain range,
A large number of so-called personal computers and online terminal devices are connected to communication lines and mutually use databases and resources. This allows resources to be shared and data to be stored in a distributed manner, thereby saving resources in the entire communication network.

Here, for example, when one terminal device attempts to use the database of another terminal device, a message to that effect is sent from one terminal device to the other terminal device. The other terminal device that receives this reads the database from its own storage device and, for example, transfers it all to the one terminal device that outputs the message. One of the terminal devices to which the database has been transferred uses it to start a certain task.

By the way, a terminal device connected to a communication line of such a closed communication network cannot predict when a certain message will be sent from another terminal device. Therefore, according to operational regulations, the power is turned on individually every morning at a set time and turned off at a predetermined time, or the power is turned on continuously for 24 hours.

In some cases, a so-called remote centralized power supply system is adopted in which a power supply line is laid in parallel with the communication line and the power of all terminal devices constituting the closed communication network is turned on and off at one location.

[Problem that the invention seeks to solve]

However, the method of turning on the power individually requires an administrator for each terminal device, and also causes problems unless the devices are turned on and off at the scheduled times according to operational regulations. On the other hand, 2
The four-hour continuous operation method and the remote centralized power supply method have the disadvantage that many terminal devices are left with their power turned on, resulting in a large amount of power consumption. Furthermore, the remote power supply system has the disadvantage that when it becomes large-scale, it becomes necessary to prevent electromagnetic induction from the power supply line to the communication line.

The present invention has been made with attention to the above points, and an object of the present invention is to provide a closed communication network in which the power supplies of terminal devices connected to a communication line can be individually and remotely controlled.

[Means for solving problems]

The closed communication network of the present invention includes a communication line, a plurality of terminal devices, a communication control device inserted between the communication line and the plurality of terminal devices to control transmission and reception of signals between the two, and the above-described communication control device. The communication control device consists of a power source that supplies power to each terminal device for its operation, and a power switch unit that is inserted between this power source and each terminal device to turn on and off the power circuit of the terminal device. , monitor the above communication line,
The present invention is characterized in that the on/off operation of the power switch unit is controlled by a power control signal input from the communication line.

[Effect]

As described above, in the present invention, the power of each terminal device is turned on and off only when a power control signal is manually transmitted from another terminal device or the like via a communication line.

Therefore, terminal devices that are not in use are always powered off. Instead, the communication control device constantly monitors the communication line, and when a power control signal is input, it operates the power switch unit to turn on the power.

〔Example〕

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

FIG. 1 is a schematic configuration diagram showing an embodiment of a closed communication network of the present invention.

This closed communication network has a communication control bag ff1 connected to a bus-type communication line 5 made of coaxial cables, optical fibers, etc.
This configuration has three terminal devices 2a to 2C connected via la to 1c. Note that a large number of terminal devices are connected to this communication line 5, but their illustration is omitted for convenience of explanation.

Each terminal device 2a to 2c is supplied with power for its operation from a power source 4a to 4c, but a power switch (3a) is provided between the power source 4a to 4C and the terminal device 2a to 2c.
~3c has been inserted.

These power switches 3a to 3c are communication control bags f.
This circuit incorporates a switch 6 (displayed only in the power switch 3a) that is turned on and off by ffla to 1c. For example, the power switches 3a to 3C are composed of an electromagnetic relay (not shown) connected in a normally open state and a driver circuit (not shown) that excites the electromagnetic relay. This switch 6 is inserted in series in the power supply circuit.

The communication control devices 1a to IC receive and transmit signals transmitted on the communication line 5, and also include a so-called transceiver that sends signals onto the communication line 5, an interface, and a microcontroller for controlling the transmission and reception of signals. This is a circuit that includes a processor, memory, etc.

In the present invention, when the control wholesale devices 1a to IC receive a manually input power control signal from the communication line 5 sent from the terminal device, they direct the corresponding instruction to the power switch units 3a to 3c. and output it. Thereby, the power switch units 33-3C turn on and off the switches 6 inserted between the power supplies 43-4C and the terminal devices 2a-2c.

The closed communication network with the above configuration operates as follows.

First, for example, an operator of the terminal device 2b
Consider the case where a database managed by a is accessed. At this time, it is assumed that the terminal device 2a is not in use and the power switch 3a is in the off state.

Here, the operator of the terminal device 2b declares the use of the terminal device 2a (hereinafter LOGI) from the keyboard of the terminal device 2b.
(called N-message) is done manually.

This LOGIN message includes a terminal code that specifies the terminal device 2a, a terminal code that specifies the terminal device 2b, a LOGIN command, and a power control signal that requests to turn on the power of the terminal device 2a. There is. The LOGIN message sent from the terminal device 2b to the communication line 5 is received by the communication control device 1a of the terminal device 2a. When this communication control device 1a recognizes that the LOGIN message is addressed to its own station, it sends the terminal code and LOGIN command of the terminal device 2b that made the request.
It is stored in the memory built into the communication control device 1a.

On the other hand, the communication control device 1a issues a command to the power switch 3a to turn on the switch 6 based on the power control signal. As a result, the terminal device 2
a is connected to the power source 4a and activated. Thereafter, the communication control device 1a outputs the LOGIN command previously stored in the memory to the terminal device 2a. Communication control device 1a is LOG
If the so-called warm-up time from receiving the IN message to starting the terminal device 2a is long, L O
The communication control device 1a may generate a return message indicating that the G I N command is pending and send it to the terminal device 2b. The operator of the terminal device 2b sees the message and waits with peace of mind.

LOG and IN commands are input to the terminal device 2a, and the terminal bag f2
Once the terminal device 2a makes a predetermined response to the terminal device 2b, the process then shifts to normal processing.

Note that after the LOG and IN messages sent from the terminal device 2b are received by the communication control device 1a, the LOG I N messages are not sent until the end of use declaration (hereinafter referred to as the LOGOLIT message) is sent from the terminal device 2b. It may also be stored in a status register within the communication control device 1a. Even when a LOGIN message is sent from another terminal device 2c, it is stored in another status register in the same way.

In this way, the control bag ff1la can recognize the terminal device currently being logged in at any time.

Moreover, for example, LOGOU sent from the terminal device 2b
Even if the T message includes a power control signal requesting to turn off the power supply 4a, other terminal devices 2
If the status register is being logged in, you can check the status register and take measures to prevent the power from being turned off.

That is, when the control device 1a receives the LOGOUT message, the control device 1a reads the LOGOUT message from the status register.
Delete the LOGIN message of the terminal device that sent the T message. and other LO in the status register
If no GIN message is stored, output a command to turn off the power switch (3a), and if even one other LOG I N message is stored, the power control signal will be ignored. With such a configuration, remote control for not only turning on the power source 4a but also turning off the power source 4a can be carried out safely and reliably.

Note that in the closed communication network of the present invention, this operation of turning off the power is not necessarily required, and may be provided as a so-called open function.

C. Effects of the Invention] According to the closed communication network of the present invention described above, it is possible to individually remotely control the power on/off of other terminal devices from any terminal device in the closed communication network. Therefore, the troublesome operation and management of turning on each terminal every morning can be eliminated. Furthermore, since the power to each terminal device is turned off except when necessary, power can be saved and there is no risk of induction failure or the like occurring.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of a closed communication network of the present invention. 1a~IC...Communication control device, 2a~2C...
...Terminal device, 3a-3c...Power switch unit, 4a-
4C...Power supply, 5...Communication line. Applicant: NEC Corporation

Claims (1)

[Claims] a communication line, a plurality of terminal devices, a communication control device inserted between the communication line and the plurality of terminal devices to control the transmission and reception of signals between the two, and a communication control device for controlling the operation of each of the terminal devices. and a power switch unit inserted between the power supply and each terminal device to turn on and off the power supply circuit of the terminal device, the communication control device monitors the communication line, A closed communication network characterized in that the on/off operation of the power switch unit is controlled by a power control signal input from the communication line.