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Mine

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#374847 ·published 2007-02-27 21:11 UTC
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You can do it without a quadrature but you still need a index pulse.

If you’re using a quadrature encoder and the printer port.
Most people can run a base period of 20us, which is 50khz.  Emc2 can count an edge per period.  You should be able then to count with a 100ppr-> reading all the edges is 400edges.  The max emc should be able to read is 50khz/400edges=125rps=7500rpm.  You normally want some headroom though.

If you’re using a non quadrature you should be able to double that.

sam