Kirk Wallace wrote: > I believe it is a matter of running wires from the encoder to both the > step/dir controller and digital inputs to EMC2. These inputs could be > parallel port inputs, but again these parallel port software counters > (input version of signal generator output) are slow. The problem with doing this is the pulses of power drawn by the Gecko (or similar) PWM drive stage produces quite large transients on the grounds. These can easily reach 20 V or more difference between the grounds on two Gecko drives with only a few inches of wire to the common power supply. Tying the encoder signals from multiple drives to a common logic input group (either PC or encoder counter interface) will likely cause a lot of interference between drives, and may not work at all. That's why my Gecko Interface uses opto-isolators to connect the encoders to individual Gecko drives.
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