Re: Geckodrive asking for user input

Most of the PLCs I use have optoisolators that can be wired with either polarity input. They have two LEDs wired opposite to each other so either one can trigger the output transistor. I don't know, however, if they can be used with the low voltage of 3.3 volts. I rather doubt it but the option to used COMMON connected to either supply polarity would be nice.

As an aside, could people be a little more careful about sending and editing the entire reply when responding to a posting. The latest was 116K. Not a problem with a cable modem, but those with phone hookups must get a little impatient.

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1) Be 100% backwards compatible with the existing drives. That means
supplying +5VDC to the COMMON terminal and require 5VDC
step/direction signal levels. The G203 would keep an unplug and
replace compatibility with our current drives.

2) Change the COMMON terminal spec from +5VDC to GND. The G203
requires only 2mA max to operate step/direction optos instead of
16mA. The G203 has a max step pulse frequency of 350kHz (>10,000 RPM
on a 1.8-degree motor) without any funny G201 step/direction timing
restrictions.

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Earle Rich
Mont Vernon, NH
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