JPH06112960A - Power control device - Google Patents

Abstract

(57) [Summary] [Object] To provide a power supply control device capable of controlling the power supply of devices connected to a network individually and without providing a control line for the power supply. A power supply control signal 18 for controlling the power supply of a specific terminal device 13a is carried on a network 16 together with a data signal. Then, the shift register 22 of the terminal device 13a detects the power supply control signal 18 in the signal input via the receiver 23. On the other hand, the addressing DIP switch 26 holds the address of the device.
A comparator 25 compares the address held by the addressing dip switch 26 with the power supply control signal 18 detected by the shift register 22, and issues a signal when they match. The counter circuits 31 and 33 count the number of times this signal is issued, and output when the predetermined number of times is counted within the set time. Then, the power supply control circuit 34 controls the power supply in response to the outputs of the counter circuits 31, 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply control device,
More specifically, the present invention relates to a control device that turns on / off the power of a terminal device that is used by being connected by a data communication line.

[0002]

2. Description of the Related Art At present, an online system in which a host computer and a plurality of terminal devices are connected by a communication line to perform one operation as a whole is widely used in various fields such as bank ATMs and train reservations. . In such a system, there is a system provided with a system in which the power supply of the terminal devices can be collectively controlled so that the power supply of the terminal devices does not have to be individually turned on and off. In this power control system, for example, when the host computer is turned on, the host computer turns on all the terminal devices, and conversely, when the host computer is instructed to turn off the power, first of all the terminal devices are turned on. Powers off and then the host computer powers itself off.

[0003]

However, in order to provide the above-mentioned power supply control system, a control line for controlling the power supply must be laid separately from the cable for data communication, which is troublesome for wiring. However, the application of this method requires a great deal of cost. Further, in the conventional power supply control method, the following problems occur because the host computer side gives a single instruction to turn on and off the power of all terminal devices. First, although online systems are used in various fields, it may be necessary to turn on only one or several terminals depending on the business, and it may not be necessary to turn on all terminals. Even in such a case, conventionally, it was necessary to turn on the power collectively without distinguishing the required terminal and the unnecessary terminal. Further, when a certain terminal device is used to perform an off-line work unrelated to the host computer and other terminal devices, a command may be issued from the host computer to forcibly turn off the power. In this case, the content of the work performed by the terminal device may disappear without being stored in the storage device. Furthermore, since the master for controlling the power supply is fixed at any place, the host computer, which is the master station, or a specific terminal device equipped with its control device is operated to turn on / off the power supply. There was a need. An object of the present invention is to solve the above-mentioned problems, and to provide a power supply control device capable of controlling the power supply of devices connected to a network individually and without providing a control line for the power supply. To do.

[0004]

In order to achieve this object, a power supply control device of the present invention is a power supply control signal comprising a data signal on a network and an address and control information for controlling the power supply of a specific device. And a communication interface unit for transmitting and receiving information between a network and a device, a detection unit for detecting a power supply control signal from an output signal of the communication interface unit, and a device Address holding means for holding the address of the above, and comparing means for comparing the address held by the address holding means with the address in the power supply control signal detected by the detecting means, and issuing a signal when the two match. Counting means for counting the signals from the comparing means, and outputting an output when the signals are counted a predetermined number of times within a set time; And having a power supply control means for controlling the connection between the power supply and the device in response to a force.

[0005]

In the power supply control device configured as described above, a data signal and a power supply control signal including an address and control information for controlling the power supply of a specific terminal device are carried on the network. Then, the detection means of the terminal device detects the power supply control signal in the signal input via the communication interface means. On the other hand, the address holding means holds the address of the device. The comparing means compares the address held by the address holding means with the power supply control signal detected by the detecting means, and outputs a signal when the two match. The counting means counts the number of times of this signal, and outputs when the predetermined number of times is counted within the set time. Then, the power supply control means controls the connection between the power supply and the device in response to the output of the counting means.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a state in which terminal devices 13a, 13b, 13c, and 13d including the power supply control device of the present invention are connected to a LAN together with a host computer 12. Multiple terminal devices 13a, 13b, 13c, 13d
And the host computer 12 are the network cable 1
6, and both ends of the network cable 16 are terminated by terminators 15. In this embodiment, the host computer 12 controls each terminal device 13
a, 13b, 13c, 13d has a function of generating a power supply control signal for controlling the power supply to the power supply control device, and this power supply control signal is sent via the network cable 16 together with a normal data signal. Terminal devices 13a, 1
3b, 13c, 13d.

First, the structure of the power supply control signal for controlling the power supply control device of this embodiment will be described. The power supply control signal is an address consisting of 7 bits for specifying each terminal device 13a, 13b, 13c, 13d, and power on / off.
It is composed of 8 bits as a whole from 1-bit control information for instructing the OFF. The control information bit (positioned first) indicates that the power is turned off when it is "0" and that the power is turned on when it is "1". The power supply control signal having such a configuration is repeatedly transmitted 10 times in order to prevent malfunction of the power supply control device as described later.

FIG. 2 shows a block diagram of a power supply control device provided in the terminal device 13a according to an embodiment of the present invention.
First, the configuration of the power supply control device shown in the figure will be described.
Receiver 23 connected to the network cable 16
Is a data receiving circuit 24 (terminal device) for receiving the above-mentioned data signal and power supply control signal carried as a serial signal via the network cable 16 to electrically convert the voltage level and the like and performing data communication. Side) and the shift register 22. The oscillator 21 generates a clock signal 50 for detecting the power supply control signal and outputs it to the shift register 22. Shift register 2
2 separates the power supply control signal (serial signal) in the signal input from the receiver 23 by using the clock signal generated by the oscillator 21 (this operation will be described in further detail later), The parallel signal is converted and output to the comparator 25. At the same time, the first 1 bit (control information) of the parallel-converted power supply control signal
Is output to the first input terminal 28a of the NOR circuit 28 and the first input terminal 29a of the NOR circuit 29 via the inverter 27.

On the other hand, addressing DIP switch 26
Holds a predetermined address (-1110101) for specifying the terminal device 13a, and outputs this to the comparator 25. The comparator 25
The power supply control signal input from the shift register 22 and the address input from the addressing DIP switch 26 are compared, and if the two match, the signal is sent to the second input terminal 28b of the NOR circuit 28 and the NOR circuit 29. To the second input terminal 29b.

The signal from the NOR circuit 28 is supplied to the input terminal 30a of the one-shot circuit 30 and the C of the counter circuit 31.
It is input to the K terminal. In response to the input of this signal, the one-shot circuit 30 applies a low-level output from the bar Q terminal to the CLR terminal of the counter circuit 31 for a preset time. This time is set to correspond to the time required to send the power control signal from the host computer 12 ten times. The counter circuit 31 counts the signal from the NOR circuit 28 while the low-level output is being applied, and when this signal is counted 8 times, O
The signal 56 is output from the F terminal to the power supply control circuit 34. Similarly, the signal from the NOR circuit 29 is input to the input terminal 32 a of the one-shot circuit 32 and the CK terminal of the counter circuit 33.

The power supply control circuit 34 has an input line 34a connected to the power supply side and an output line 34b connected to the power supply side of the terminal device 13a, controls a relay (not shown), and counter circuit 31. Is connected to the input / output lines 34a and 34b to turn on the power, and the input from the counter circuit 33 turns off the power.

Next, the waveform of the signal carried on the network cable 16 will be described with reference to FIG. Here, the host computer 12 shown in FIG.
The case where the power supply control signal 18 is sent out onto the network cable 16 in order to cut off the power supply of 3a will be described as an example. The host computer 12 and the terminal devices 13a, 13b, 13c, 13d shown in FIG. 1 exchange information via the network cable 16. During normal data transmission / reception, a high-frequency pulse-shaped data signal 17 is carried in bursts. In order to clarify the state of the data signal 17, a part thereof is expanded on the time axis and shown as a signal 17 '. Here, when the host computer 12 attempts to turn off the power supply of the terminal device 13a, the power supply control signal 18 "01110101" including the control information "0" and the address "1110101" for specifying the terminal device 13a. Is transmitted to the network cable 16. The power supply control signal 18 is formed of a pulse signal having a frequency lower by 1 to 2 digits than the data signal, and is repeatedly transmitted 10 times in order to prevent malfunction of the power supply control device. The pulse train including the power supply control signal 18 and the data signal 17 is input to the receiver 23 shown in FIG. 2 as described above.

Next, the operation of the power supply control device shown in FIG. 2 will be described with reference to the timing chart shown in FIG. The receiver 23 demodulates the pulse train input via the network cable 16, converts the voltage level, shapes the waveform, and inputs the output signal 51 to the shift register 22. On the other hand, the oscillator 21 generates a clock signal 50 having a frequency close to the frequency of the power supply control signal 18 and outputs it to the shift register 22. Shift register 22
Constantly tries to shift the signal 51 input from the receiver 23 using the clock signal 50 from the oscillator 21, and the power control signal 18 is included in the signal 51 from the receiver 23.
, It is shifted into the signal 5
Separated from 1. The separated power control signal 18 is
The shift register 22 performs parallel conversion and outputs the 8-bit signal (01110101) to the comparator 25. The comparator 25 outputs the power control signal 1
8 (8-bit signal) and the address of the terminal device 13a input from the addressing DIP switch 26 (-11
10101) and detected the power supply control signal 18
Determines whether the terminal device 13a is designated. In the case of this example, the power supply control signal 18 indicates that the terminal device 1
3a is designated and coincides with the address from the addressing DIP switch 26, the low-level signal 52 from the comparator 25 causes the second input terminal 28b of the NOR circuit 28 and the second input terminal 29 of the NOR circuit 29.
It is output to b and.

At the same time, from the shift register 22, the control information "0" at the head of the separated power supply control signal 18 is outputted.
The low-level signal corresponding to is the first signal of the NOR circuit 29.
It is output to the input terminal 29a. As a result, the low-level signal 53 is output from the NOR circuit 29 and input to the input terminal 32a of the one-shot circuit 32 and the CK terminal of the counter circuit 33. With this signal 53, the one-shot circuit 32 inputs the low-level signal 54 to the CLR terminal of the counter circuit 33. As described above, this signal 54 maintains the low level for the time corresponding to the interval at which the power supply control signal 18 is transmitted 10 times. Then, each time the power control signal 18 is sent from the host computer 12,
The NOR circuit 29 outputs a pulsed low-level signal 53. The counter circuit 33 counts the pulsed low-level signal 53, and when the count value reaches eight times while the low-level signal 54 from the one-shot circuit 32 is being applied, a high-level signal 55 from the OF terminal. To the power supply control circuit 34. In response to this, the power supply control circuit 34 shuts off the power supply of the terminal device 13a.

In the above description, the host computer 12
Has described the example in which the power of the terminal device 13a is cut off. Conversely, when the power of the terminal device 13a is turned on, the host computer 12 causes the control information "1" and the terminal device 13
A power supply control signal "11110101" including an address "1110101" for specifying a is sent to the network cable 16. As a result, the shift register 22 of the power supply control device outputs a high-level signal corresponding to "1" as the control information, which is the inverter 27.
Is inverted by the first input terminal 28a of the NOR circuit 28.
Entered in. On the other hand, the low-level signal 52 from the comparator 25 is also supplied to the second input terminal 28b of the NOR circuit 28.
The NOR circuit 28 outputs a signal to the one-shot circuit 30 and the counter circuit 31. As a result, the counter circuit 31 outputs the signal 56 from the OF terminal, and in response to this, the power supply control counter circuit 34 turns on the power of the terminal device 13a.

In this embodiment, the host computer 1
The reason why 2 sends the power supply control signal 18 ten times and causes the counter circuits 31 and 33 of the power supply control device to count this will be described in more detail with reference to FIG. 3 again. In data communication, a high frequency data signal 17 is carried in bursts on a network cable 16. In this embodiment, the high frequency data signal 17 and the low frequency power supply control signal 18 are transmitted, but the burst state of the data signal 17 accidentally forms a shape similar to the power supply control signal 18. Can be. Therefore, if the power supply control device is caused to perform the control operation by detecting the power supply control signal 18 once,
It was expected to cause a malfunction. Therefore, in the present embodiment, the number of times, which cannot occur by chance due to the data signal 17 by chance, is set as a condition for operation to prevent malfunction.

Further, in this embodiment, as described above, the one-shot circuits 30 and 32 are set to the time corresponding to the transmission time of the power supply control signal 18 ten times, and within this time, the counter circuits 31 and 33 are set to 8 times. The power supply is controlled when the signal input is counted more than once. As a result, the power supply control device according to the present embodiment is provided with the power supply control signal 18 once or twice due to, for example, noise on the network cable 16.
Even if it is not detected, the control operation can be surely performed.

Here, another configuration example of the network shown in FIG. 1 will be described with reference to FIG. Although the bus-like LAN is used in the network of FIG. 1, the host computer 12 and the terminal device 13 are used in the network of FIG.
e, 13f, 13g, and 13h are the respective cables 1
It is composed of a star-shaped LAN directly connected by 4. The power supply control device of the present invention can be preferably used in a LAN having such a configuration.

In the above-described embodiment, in order to hold the address on the side of the terminal devices 13a, 13b, 13c, 13d shown in FIG. 1, the address is set in the addressing DIP switch 26 shown in FIG. 2 by a mechanical method. However, instead of this, it is also possible to hold an address as a part of software by using a register or the like. Further, in the above description, the terminal devices 13a, 13b, 13c, 13
Although the example in which the connection / disconnection of the power source of d is controlled from the host computer 12 has been described, the system using the power source control device of the present invention sends the power source control signal 18 to the terminal device 13a, in the same manner as performing data communication. 13b, 13c, 13d
You can send and receive to and from each other. Therefore, for example, the terminal device 13
It is possible to control the other terminal devices 13b and 13c from a, and further it is possible to control the host computer 12 including the power supply control device of this embodiment from the terminal device 13a.

[0020]

As is apparent from the above description,
According to the power supply control device of the present invention, in an online system, the power supply of each device connected to the network can be controlled without laying a control line for controlling the power supply. Further, in the present invention, the terminal device is specified by the address of the power supply control signal to control the power supply. Therefore, it is not necessary to collectively turn on and off the power of the entire system as in the conventional case, and the power supply of the specific terminal device is not required. Only this can be turned on / off. Further, in the present invention, since the power supply control operation is performed when the power supply control signal is detected a predetermined number of times within the set time, there is an advantage that no malfunction occurs and the reliability is high. Furthermore, according to the present invention, it is not necessary to separately control a power source as a master (a side that issues a control command) and a slave (a controlled side) for power source control as in the related art, and a terminal device can be designated by specifying an address. Mutually
It is possible to control the power supply of the host computer from the terminal device, and there is a remarkable effect that the flexibility of the power supply control of the online system can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of a network using a terminal device to which a power supply control device according to an embodiment of the present invention is applied.

FIG. 2 is a block diagram of a power supply control device according to an embodiment of the present invention.

3 is a waveform diagram of signals on a network using a terminal device to which the power supply control device shown in FIG. 2 is applied.

FIG. 4 is a timing chart of the power supply control device shown in FIG.

5 is a block diagram showing a configuration example different from the network configuration shown in FIG. 1. FIG.

[Explanation of symbols]

 12 host computer 13a terminal device 16 network cable 21 oscillator 22 shift register 23 receiver 25 comparator 26 addressing DIP switch 30 one-shot circuit 31 counter circuit 32 one-shot circuit 33 counter circuit 34 power supply control circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical indication location H04L 29/00 H04Q 9/00 301 A 7170-5K 8220-5K H04L 13/00 T

Claims (2)

[Claims] 1. A power supply control device in a system in which a data signal and a power supply control signal composed of an address and control information for controlling the power supply of a specific device are carried on a network. Communication interface means for transmitting and receiving information between devices, detection means for detecting a power supply control signal from the output signals of the communication interface means, address holding means for holding the address of the device, and the address holding means The address held by the means is compared with the address in the power supply control signal detected by the detecting means, and the comparing means that issues a signal when the both match, and the signal from the comparing means are counted and set within the set time. A counting means that outputs an output when a predetermined number of signals are counted, and a connection between the power source and the device in response to the output of the counting means. A power supply control device having a power supply control means. 2. The power supply control device according to claim 1, wherein the power supply control means controls a connection between the power supply and the device based on control information in the power supply control signal.