US4608648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data display system
Assignee: Mitsubishi Electric Corp
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Filing: 1984-04-09
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Granted: 1986-08-26
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Expires: 2004-04-09
Abstract
Abstract A data display system for displaying selectively on a data display computational data from a central processing unit (CPU) and data stored in a memory representing setting values used as criteria for the result of computation by the CPU. Setting values to be displayed are set on an operation device and, after being processed by the CPU, are sent to the memory. The stored data of setting values are selected by a selection switch and sent through a multiplexer to a data display device. A display selection switch means operates on gate means and the multiplexer to supply a numeric code set on the operation device corresponding to computational data to be displayed to the CPU through the gate means, so that computational data from the CPU is sent through the multiplexer to the data display device.
Inventors
- 👤 Kenji Oogaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:27
CPC Classifications
H; H02; H02H; H02H3/00; G; G01; G01R; G01R13/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
372 words
A data display system for power line systems having a digital data display device for displaying selectively computational data used in a computational process carried out by a central processing unit in a digital protective relay and setting values stored in a memory for use as reference criteria in the computational process by said central processing unit, said system comprising: an operation device for specifying numeric codes in correspondence to said computational data and addresses of said memory storing said setting values; selection switch means for specifying one of said setting values stored in said memory; gate circuit means adapted to pass the output of said operation device selectively to said central processing unit or said memory; a display selection switch for controlling operation of said gate circuit means; a multiplexer adapted to pass selectively one of computational data from said central processing unit or a setting value from said memory under control of said display selection switch; said selection switch means comprising switches equal in number to the number of said setting values; an encoder circuit which receives the outputs of said switches; a second multiplexer which receives a selection signal produced by said encoder circuit in response to an ON-state of any one of said switches and, during a period of receiving the selection signal, passes only the output of said encoder circuit to said memory; said gate circuit means comprising a first gate circuit which passes the output of said operation device to said memory when said display selection switch is set in a first state and blocks the output when said display selection switch is set in a second state, and a second gate circuit which passes the output of said operation device to said central processing unit when said display selection switch is set in the second state and blocks the output when said display selection switch is set in the first state; and a data display register connected between said central processing unit and said multiplexer; whereby computational data specfied by the setting on the operation device is displayed on said display device to allow display of computational data without the need for a special maintenance operation to monitor the process of said central processing unit.
Claim 2
Dependent Claim
372 words
A data display system for power line systems having a digital data display device for displaying selectively computational data used in a computational process carried out by a central processing unit in a digital protective relay and setting values stored in a memory for use as reference criteria in the computational process by said central processing unit, said system comprising: an operation device for specifying numeric codes in correspondence to said computational data and addresses of said memory storing said setting values; selection switch means for specifying one of said setting values stored in said memory; gate circuit means adapted to pass the output of said operation device selectively to said central processing unit or said memory; a display selection switch for controlling operation of said gate circuit means; a multiplexer adapted to pass selectively one of computational data from said central processing unit or a setting value from said memory under control of said display selection switch; said selection switch means comprising switches equal in number to the number of said setting values; an encoder circuit which receives the outputs of said switches; a second multiplexer which receives a selection signal produced by said encoder circuit in response to an ON-state of any one of said switches and, during a period of receiving the selection signal, passes only the output of said encoder circuit to said memory; said gate circuit means comprising a first gate circuit which passes the output of said operation device to said memory when said display selection switch is set in a first state and blocks the output when said display selection switch is set in a second state, and a second gate circuit which passes the output of said operation device to said central processing unit when said display selection switch is set in the second state and blocks the output when said display selection switch is set in the first state; and a data display register connected between said central processing unit and said multiplexer; whereby computational data specfied by the setting on the operation device is displayed on said display device to allow display of computational data without the need for a special maintenance operation to monitor the process of said central processing unit.
Claim 3
Dependent Claim
17 words
A data display system according to claim 1, wherein said digital protective relay comprises a range relay.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-25 | 1990-02-24 | 1990-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-25 | 1994-02-24 | 1994-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-25 | 1998-02-24 | 1998-08-26 | $7700.00 | Window Closed / Lapsed |