Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2001-10-16
2002-10-22
Young, Brian (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S116000
Reexamination Certificate
active
06469651
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a multi-function type absolute converter that can be adapted to a user-specification based interface.
2. Description of the Prior Art
An absolute converter having a preset specification incorporates a conversion circuit for converting absolute sensor detection signals to digital position signals, and is configured to output digital signals having a specific, predetermined pattern. Therefore, each time there is a change in the required signal specification, it is necessary to make changes to the circuitry of the absolute converter. Moreover, in order to write information to, and erase information in, system ROM in which are stored signal conversion lookup tables and conversion control programs and the like, it is necessary to remove the ROM or to make up separate write circuit patterns.
An object of the present invention is to provide a multi-function type absolute converter that can readily convert output signal patterns and the like.
SUMMARY OF THE INVENTION
A multi-function type absolute converter according to the present invention comprises a sensor I/O port having a plurality of sensor connection terminals that can be connected to a plurality of absolute sensors, a conversion circuit for converting absolute sensor detection signals input via the sensor connection terminals to digital position signals, a programmable logic device that can perform prescribed processing on the digital position signals thus generated, a host I/O port having output terminals for outputting the digital position signals and signals generated by the programmable logic device, a switching circuit for switching sensor connection terminals, and a control circuit for controlling each part, the control circuit comprising mainly a CPU, ROM and RAM.
Switching by the switching circuit can be controlled by switching control signals from the control circuit or switching control signals input via the host I/O port.
Further features of the invention, its nature and various advantages will be more apparent from the accompanying drawings and following detailed description of the invention.
REFERENCES:
patent: 5066953 (1991-11-01), Lengenfelder
patent: 5933106 (1999-08-01), He
Burns Doane Swecker & Mathis L.L.P.
Harmonic Drive Systems Inc.
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