G - Physics – 01 – P
Patent
G - Physics
01
P
G01P 3/481 (2006.01) G01D 5/245 (2006.01) G08C 21/00 (2006.01)
Patent
CA 2232399
The present invention relates to a device that incorporates all of the features of an incremental encoder, plus the necessary circuitry to count the pulses from the encoder, and the circuitry to communicate the results to a user-friendly application environment on a personal computer, in a single compact housing. The output from the incremental encoder is converted to an absolute output using a hardware counter which reads a 2 wire pulsed quadrature signal and which outputs a binary parallel latched signal. This output is subsequently converted in a microprocessor to either a high resolution position signal, or it is converted to a speed measurement, based on a precise clock in the microprocessor. The microprocessor also handles the conversion of the position or speed measurement to a signal which is transmitted to a host computer using a high speed serial communication protocol. The nature of the output can be controlled from the host computer, typically a personal computer, and can be easily modified by the user to change features such as the maximum position count of the encoder before the reading returns to zero, or the time interval which is to be used in the calculation of the speed of the device, or the calibration of the units in which the output is displayed. The device itself is self-contained and does not have any user-serviceable parts. All diagnostics and configuration and calibration are performed on the host computer. The communication protocol used is the Universal Serial Bus, which is fast, and which does not require any technical expertise of any sort on the part of the user. The device incorporates all of the features one would typically find in an absolute encoder, but the mechanical design is that of an incremental encoder, and it is therefore very simple to manufacture, and flexible in design.
Hohner Corp
Penner Alvin
LandOfFree
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