Hood
I am obsessed.
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- Carnoustie, Scotland
Where the parallel port starts to fall down is when you are using servos rather than steppers due to the pulse requirement of servos. As an example my Plasma has approx 1700pulses per mm and a velocity of 20,000mm/min so that means I need a pulse rate of approx 567KHz which is more than 10x the reliable pulse rate (45KHz) that the parallel port can output. Yes you can do electronic gearing within the servo drive to reduce the requirements but that may or may not be ideal.
Another thing about the parallel port is it is 5v (more often 3.3v or so) and that can be problematic for noise, personally I much prefer to have everything , I/O wise, at 24v
Another thing about the parallel port is it is 5v (more often 3.3v or so) and that can be problematic for noise, personally I much prefer to have everything , I/O wise, at 24v