[dhprc2]

Hi,

From time to time I have read recommendations to use an optocoupler or opto-isolater between a CNC control card and the parallel port on the computer as a way of preventing potential damage to the innards of the computer.

Is there a commercial product available to perform this function or is it something I need to build myself?

Are there any instructions available on how to build such a beast?

Do any control cards come with this feature integrated on the card? It would seem to make sense to me...

Thanks for the help!