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you mean if a analog value is above X = High, if below = LOW?

The hardest part of working with the parallel port is getting the latency down as you have 2 threads going and the fact the base thread is usually 25000 ns for decent stepper speed .
With a mesa setup you only need a servo thread running at 1ms. Getting the latency right is far less work, usually it's good right out of the box. You'll find you machine moves more smoothly, due to the stepper signals being generated by hardware.
It's all plus plus, mesa is well supported on the forum, Pete is an absolute gent, mesa products are rock solid and quite expandable via their Smart serial interface.
I know most people on the forum will recommend Mesa, but the thing is they are that good.

Glad to hear you're up & running.

Cheers
Rob

Brilliant!  I just had GMNOCCAPY up and running for hours without a glitch after making that change.  Believe you nailed it.

Thanks for the great tip.

Jeff

Thanks scotta , ini and hal attached.
I played around with the p i d settings today in the INI but it made no difference. Dip in voltage was still there. Also when I set the gain to 0.0025 which should be the correct value for 4000rpm. It doesn't scale right. I need to input 0.02 for it to work.
 

What makes me wonder is why  constantly forcing index-enable low does not cause a problem for you.
 
You are right. I haven't used G33.1 yet. Will test it soon. 
But from the looks of it, this is not easily solveable --> need to disconnect the index somehow...

EDIT: Could we write a switch component that passes the signal in both directions (similar to mux2 but bidirectional... ) ?

EDIT2: The easiest solution for this is to probably just install a optical sensor as a second index signal... and then use this for indexing in M19 or for G33.1 ?

Thank you. I was clearly fantasizing that the mesa card would give me the power of linuxcnc and the ease of deployment of grbl. Silly me.

For the spindle 0-10v output there is a PWM to analogue chip on the board. Remora uses hardware PWM to drive that chip. The 0 - 100% SP determines the duty cycle for the PWM.

It would help to share your config files to see what influences the SP on the LinuxCNC side as there is no interactions between the Remora modules, stepgen and PWM, running on the EC500.