JPH05204497A - Peripheral device remote-controlled on/off of power source - Google Patents

Abstract

PURPOSE:To extremely easily attain the on/off of a power source even when a peripheral device is arranged far from a high-order device by making the peripheral device to detect the on/off of the power source of the high-order device to turn on/off its own power source. CONSTITUTION:A detection part 2 contains an inside power source for its own operation. The detection part 2 monitors the voltage of a signal line 5 to respectively output a connection signal when it becomes larger than a first reference voltage and a power source disconnection signal when it becomes lower than a second reference voltage to a power source control circuit 23. The power source control circuit 23 has a power source which is necessary for its own operation inside and when receiving a power source disconnection signal and a power source disconnection signal, it disconnects the connection of an external power source and a peripheral device 2 to make the power source of the peripheral device 2 to be off. Thus, even when the peripheral device is arranged far from the high-order device, the on/off of the power source can extremely easily be executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a peripheral device, for example, a magnetic storage device, and more particularly to an S that operates in accordance with the SCSI (small computer system interface) standard.
The present invention relates to a peripheral device that has a CSI controller and is controlled by a host device and is remotely controlled to turn on and off a power supply that performs a predetermined operation by an electric power supplied from the outside.

[0002]

2. Description of the Related Art FIG. 2 is an explanatory diagram showing a connection relationship between a conventional peripheral device of this type and a host device.

This type of conventional peripheral device 3 has a built-in SCSI controller 22 and a separate SCSI controller 1
A host device 1 having a built-in device 1, for example, a personal computer main body and a plurality of connection lines 4 are used to connect both SCSs described above.
The I controllers 11 and 22 are connected to each other and are controlled by the above-described higher-level device 1 to perform a predetermined operation. The control signal from the host device 1 is input to the SCSI controller 22 of the peripheral device 3 via the connection line 4 described above.

In order to operate the peripheral device 3 connected to the host device 1 together with the host device 1, the power of the host device 1 is turned on to bring the host device 1 into the operating state and the peripheral device 3
Must manually turn on its own power switch 31 so that the peripheral device 3 is acquiring power from an external power source.

It should be noted that the host device 1 is included in the plurality of connection lines 4.
When the host device 1 is turned on and the host device 1 is in operation, a signal having a predetermined voltage is supplied from the SCSI controller 11, and when the power of the host device 1 is turned off, the above-mentioned voltage becomes zero. , And the connection line for outputting such a signal is hereinafter referred to as a signal line. In FIG. 2, this signal line is the signal line 5.

In addition to the peripheral device 3, a plurality of other peripheral devices are connected to the host device 1 in the same manner as the peripheral device 3 and used.

[0007]

When operating the above-mentioned conventional peripheral device together with the host device connected to the peripheral device, the power supply of the host device is turned on, and
It is necessary to manually turn on the power switch of the peripheral device, and at the end of the operations of the host device and the peripheral device, it is necessary to separately turn off the power supplies of these devices.

If such peripheral devices connected to the host device exist farther from the host device, or if a large number of such peripheral devices are connected to the host device described above, these As described above, when operating the device, all power switches of the peripheral device connected to this host device must be turned on manually as described above, and all such power switches must be turned on. It has a drawback that it is very complicated to turn on.

An object of the present invention is to detect, when the power of a host device is turned on or off, the peripheral device connected to this host device to detect the on / off state of the power supply of the host device and to make this detected state. Accordingly, it is an object of the present invention to provide a peripheral device in which the peripheral device itself can remotely turn on / off the power source so that the peripheral device itself can turn on / off its own power source.

[0010]

A peripheral device of the present invention, which is remotely controlled to turn on / off a power supply, is installed in a host device having a first SCSI controller via a connection line to a second S.
In a peripheral device which is connected to a CSI controller and is controlled by the host device via the first SCSI controller and supplied with power from an external power source to operate, the power source is built in and output from the first controller in the connection line. The voltage of the signal line to be monitored, and outputs a connection signal when the voltage becomes equal to or higher than a predetermined first reference voltage, and a second signal lower than the predetermined first reference voltage.
When a voltage of the signal line does not reach the reference voltage of, a detection unit that outputs a disconnection signal, and an internal power supply is self-contained and when the connection signal is received, the external power supply of the peripheral device is turned on and when the disconnection signal is received, A power supply control circuit for performing control to turn off the external power supply of the peripheral device is provided in the peripheral device.

Further, the peripheral device of the second invention, which is remotely controlled to turn on / off the power supply, has a second SCSI installed in a host device having the first SCSI controller via a connection line.
In a peripheral device that is connected to a controller and is controlled by the host device via the first SCSI controller and is powered by an external power source to operate, the first controller in the connection line always obtains power from the outside. The voltage of the signal line output from the second monitoring circuit is monitored, a connection signal is output when the voltage becomes equal to or higher than a predetermined first reference voltage, and a second signal lower than the predetermined first reference voltage is output. When the voltage of the signal line does not reach the reference voltage, a detection unit that outputs a disconnection signal, and when the connection signal is received by constantly obtaining power from the outside, the external power supply of the peripheral device is turned on and when the disconnection signal is received, the A power supply control circuit for performing control to turn off the external power supply of the peripheral device is provided in the peripheral device.

[0012]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a peripheral device of the present invention which is remotely controlled to turn on and off the power supply.

As shown in FIG. 1, a peripheral device 2 (hereinafter referred to as a peripheral device 2) of which the power supply of the present invention is remotely controlled is connected to a SCSI controller 22 and a signal line 5 and its voltage is controlled. Detection unit 21 for monitoring, and detection unit 21
The power supply control circuit 23 controls the power supply of the peripheral device 2 by turning on and off the power supply control circuit 23. The power supply control circuit 23 is a control circuit that supplies or cuts off power from an external power supply (not shown) connected to the peripheral device 2.

The peripheral device 2 is connected to the host device 1 by a plurality of connection lines 4 including a signal line 5.

The detection unit 2 has its own internal power supply for operating, and has a preset first reference voltage and a second reference whose absolute value is smaller than that of the first reference voltage. Has a voltage and monitors the voltage of the signal line 5,
When the voltage is higher than the first reference voltage, a connection signal is generated and output to the power supply control circuit 23. Further, when the voltage of the signal line 5 is lower than the second reference voltage, the disconnection signal is generated and output to the power supply control circuit 23.

The power supply control circuit 23 has a power supply necessary for its own operation inside, and upon receiving the above-mentioned connection signal, connects the peripheral device 2 to an external power supply (not shown). When the disconnection signal is applied to the power supply control circuit 23, the peripheral device 2 is disconnected from the external power supply (not shown) and the peripheral device 2 is powered off.

Now, the value of the first reference voltage is set to be slightly smaller than the voltage output from the host device 1 to the signal line 5 when the power supply of the host device 1 is turned on, and the value of the second reference voltage The value of the reference voltage is set to the signal line 5 when the host device 1 is turned on.
If it is sufficiently smaller than the value of the voltage output to the peripheral device 2, the power supply of the peripheral device 2 connected to the host device 1 by the connection line 4
The detection unit 21 detects the voltage of the signal line 5 that changes in response to the power on / off of the host device 1
The power of the peripheral device 2 is also turned on / off in conjunction with the turning on / off of the power.

In the above-described embodiments, the detection section 21 and the power supply control circuit 23 each have a built-in power supply necessary for their own operation, but instead of the built-in power supply, Alternatively, the power may be constantly obtained from the external power supply.

[0020]

As described above, the peripheral device of the present invention, which is remotely controlled to turn on / off the power supply, detects the on / off state of the power supply of the host device by an internal detection unit and turns on its own power supply. Since this can be performed by a power supply control circuit having built-in power supply and off, even if this peripheral device is located far away from the host device, or if a large number of peripheral devices of the present invention are remotely controlled to turn on and off. Even when connected to one host device, the power can be turned on and off extremely easily.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a peripheral device of the present invention that is remotely controlled to turn on and off a power supply.

FIG. 2 is an explanatory diagram showing an example of a connection relationship between a conventional peripheral device of this type and a host device.

[Explanation of symbols]

 1 Upper device 2 Peripheral device whose power supply is turned on / off remotely 4 Connection line 5 Signal line 21 Detector 22 Power control circuit

Claims (2)

[Claims] 1. A second SCSI controller, which is built in, is connected to a host device having a first SCSI controller via a connection line, and is controlled by the host device via the first SCSI controller to supply electric power from an external power source. In the peripheral device that is supplied and operates, the voltage of the signal line output from the first controller in the connection line is monitored and the voltage becomes equal to or higher than a predetermined first reference voltage. When the connection signal is output and the voltage of the signal line does not reach the second reference voltage lower than the predetermined first reference voltage, a detection unit that outputs a disconnection signal and an internal power supply are self-contained. And a power supply control circuit for controlling the external power supply of the peripheral device to be turned on when the connection signal is received, and the external power supply of the peripheral device to be turned off when the disconnection signal is received. A peripheral device that is remotely controlled to turn on / off a power source, which is provided in the peripheral device. 2. A higher-level device having a first SCSI controller is connected to a second SCSI controller, which is built in, through a connection line, and is controlled by the higher-level device via the first SCSI controller to supply power from an external power source. In the peripheral device which is supplied and operates, the power is constantly obtained from the outside, the voltage of the signal line output from the first controller in the connection line is monitored, and the voltage is equal to or higher than a predetermined first reference voltage. And a detection unit that outputs a disconnection signal when the voltage of the signal line does not reach the second reference voltage lower than the predetermined first reference voltage when the connection signal becomes When the power is acquired and the connection signal is received, the external power supply of the peripheral device is turned on, and when the disconnection signal is received, the external power supply of the peripheral device is turned off. A peripheral device which is remotely controlled to turn on and off the power supply, wherein a power supply control circuit is provided in the peripheral device.