Kirk Wallace wrote: > On Sat, 2012-05-26 at 13:45 -0600, Jeshua Lacock wrote: > ... snip > >> Interesting. So the pull down resistor would go on the encoder ground? >> > > No, between the encoder input terminal for each input having a problem > to the ground associated with the input. This will lower the input > impedance so the noise will be pulled closer to ground and also lower > than the trip voltage. Jeshua's AMT-103 encoder has a 2 mA source/sink driver when used by itself (without the line driver cable option). So, you can't apply too much of a pull-down or it will alter the logic levels. It should be possible to read the logic levels with a DVM by very gently moving the motor and letting it settle, you should be able to see both the high and low logic levels. The Universal Stepper Controller has about a 2.5 V logic threshold, the Gecko interface uses a PNP emitter follower driving the opto-coupler's LEDs, but the threshold there also is about the same.
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