JP2001306484A - Peripheral device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a peripheral device which can surely turn on and off the terminal resistance and also can set an ID number in a short time. SOLUTION: This peripheral device is connected to a computer via a bus and provided with a push button switch which inputs commands, a terminating resistance and a control part which connects the terminating resistance to the bus or opens the resistance in response to the command that is inputted from the push button switch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a peripheral device capable of turning on / off a bus terminating resistor and setting an ID number.

[0002]

2. Description of the Related Art As shown in FIG. 3, a system in which a computer 20 is connected to peripheral devices 21 to 23 by using, for example, SCSI buses 25 to 27 for operation is often used today.

In this system, terminating resistors 29 and 30 are connected to buses 24 and 28 which are terminating terminals, and an ID number must be set to each of the peripheral devices 21 to 23. The user sets the terminating resistor and the ID number by removing the cover of each peripheral device and operating the setting switch when constructing the system.

[0004]

As described above, it takes a long time to set on / off the termination resistor and set the ID number by removing the cover of the peripheral device and operating the setting switch. .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a peripheral device which can reliably turn on / off a termination resistor and set an ID number in a short time.

[0006]

According to the first aspect of the present invention, in a peripheral device connected to a computer via a bus, a push button switch for inputting a command, a terminating resistor, and an input from the push button switch are input. And a controller for connecting or disconnecting the terminating resistor to or from the bus based on the command.

According to a second aspect of the present invention, the control section performs a control operation of connecting or disconnecting the terminating resistor to the bus when a power switch is turned on while pressing the push button switch.

According to a third aspect of the present invention, a non-volatile ID recording unit for recording an ID is provided, and the control unit stores the ID number input from the push button switch into the ID number.
The information is recorded in the recording unit and the ID is set.

In the invention according to claim 4, an LED display unit is provided, and the control unit displays a control result based on the input command on the LED display unit. In the invention according to claim 5, a sound generation unit is provided, and the control unit causes the sound generation unit to generate a control result based on the input command.

[0010] In the invention according to claim 6, a sound is emitted from the sound generator and a control result is output.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an operation flowchart of the embodiment.

In FIG. 1, 1 is a connector for connecting a bus, 2 is an interface (I / O), 3 is a terminating resistor, 4 is a terminating resistor control unit for controlling connection and disconnection of the terminating resistor 3, and 5 is a push-button. Button switch, 6 is ID recording section, 7 is LE
D display unit, 8 is a sound generation unit, 9 is a headphone jack, 10 is a control unit, 11 is a processor (CPU), 12
Is a power supply unit, and 13 is a power switch.

Next, the operation will be described with reference to FIG. When it is desired to set the termination resistor on / off and set the ID number, the process proceeds to step S 1, and the operator turns on the power switch 13 while pressing the push button switch 5. In step S2, if the push button switch 5 is not depressed, the process proceeds to step S3, and the operation of the normal peripheral device is started.

If the push button switch 5 is depressed, the process proceeds to step S4, and the control unit 10
And the control operation start is displayed by the sound generation unit 8. As an indication of the start of the control operation, for example, the LED display unit 7 is continuously lit. In step S5, the operator inputs a control item using the push button switch 5.

The input of the control item is, for example, when the push button switch 5 is continuously pressed for 2 seconds, the terminating resistor is turned on. When the push button switch 5 is pressed twice continuously for 2 seconds, the terminating resistor is turned off.
When three consecutive presses are performed for three seconds, the ID is set, and when five consecutive presses are performed, the process ends.

If the terminating resistor is ON in step S5, the process proceeds to step S6, where the control unit 10 instructs the terminating resistor control unit 4 to connect the terminating resistor 3 to the connection line connecting the connector 1 and the I / O6. I do. Thereafter, the terminating resistor control unit 4 keeps the terminating resistor 3 connected as long as the terminating resistor OFF command described below is not transferred from the control unit 10.

If the terminating resistor is turned off in step S5, the process proceeds to step S7, where the control unit 10 instructs the terminating resistor control unit 4 to connect the terminating resistor 3 to the connection line connecting the connector 1 and the I / O 6. More open. If the ID setting has been input in step S5, the process proceeds to step S8, where the ID number is input.

The input of the ID number is performed by the number of times the push button switch 5 is pressed. That is, if the ID number is 5, the push button switch 5 is pressed five times. The input ID number is recorded in the ID recording unit 6 composed of a non-volatile memory, and is thereafter used as the ID number of the peripheral device during normal operation.

In step S8, an ID number is input, and the ID number is recorded in the ID recording unit 6, and the process proceeds to step S4.
When the process has proceeded to, the number corresponding to the ID number recorded by the LED display unit 7 and the sound generation unit 8 is continuously blinked, and a confirmation display of the recorded number is performed.

If the end is input in step S5, the process moves to step S3 to start the normal operation. Note that the peripheral devices of the push button switch 5, the LED display unit 7, and the sound generation unit 8 described in the embodiment are CD-ROM / CD-R / CD-
If the drive is an RW drive, a push button switch, an LED display, and a sound generator provided in the drive may be shared.

The start of the control operation in step S4 and the output of the control result may be output as sound and output from the headphone jack.

[0022]

According to the present invention, a command is input from the push button switch 4, and the control unit performs ON / OFF of the terminating resistor and setting of the ID number, so that the ON / OFF of the terminating resistor and the setting of the ID number are reliably performed in a short time. be able to.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is an operation flowchart of the embodiment.

FIG. 3 is a diagram for explaining a system configuration.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connector 2 Interface (I / O) 3 Terminating resistance 4 Terminating resistance control part 5 Push button switch 6 ID recording part 7 LED display part 8 Sound generation part 9 Headphone jack 10 Control part 11 Processor (CPU) 12 Power supply part 13 Power supply switch

Claims (6)

[Claims] 1. A peripheral device connected to a computer via a bus, a pushbutton switch for inputting a command, a terminating resistor, and the terminating resistor connected to the bus based on the command input from the pushbutton switch. A peripheral device, comprising: a control unit for connecting or disconnecting. 2. The control unit according to claim 1, wherein the control unit performs a control operation of connecting or disconnecting the terminating resistor to or from the bus when a power switch is turned on while pressing the push button switch. Item 2. The peripheral device according to item 1. 3. A non-volatile ID recording unit for recording an ID, wherein the control unit records the ID number input from the push button switch in the ID recording unit to set the ID. 3. The method according to claim 1, wherein
Peripheral device as described. 4. The peripheral device according to claim 1, wherein an LED display unit is provided, and said control unit displays a control result based on said input command on said LED display unit. apparatus. 5. The sound generator according to claim 1, wherein a sound generator is provided, and the controller generates a control result based on the input command from the sound generator. Peripherals. 6. The peripheral device according to claim 5, wherein a control result is output by emitting a sound from the sound generation unit.