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Parallel Port breakout boards, motherboards, and dedicated accessories / Re: PMDX-126 + ESS + MACH4 + Encoder inputs
« on: January 09, 2024, 03:28:31 PM »
Great, thank you!
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part 2: both a meter and the scope report the same frequency which is dependent on the speed, however, shouldn't RPM = 1/freq * 60? The RPM display and a tachometer both report 145-147 RPM but the frequency is 39Hz, which is again leaving me scratching my head. It's unlikely there are 3.71 slots. So what gives? This difference more or less is observed through the entire range.
But does it matter if the sensor is NPN or PNP? The PMDX-126 should be able to handle either one. From the color coding on the wires from the sensor, I'd guess that red and black are the power supply (+V and GND respectively) and yellow is the signal. Take a meter and measure the voltage from black to red to verify that these are the power supply wires.