Re: [CAD_CAM_EDM_DRO] Re: Controlling VFDs from your PC?

I am pretty sure that you get from somebody an interface card from the
shelf. Standard input for inverters is -10V...0...+10V.
Just search for it. Often trying to make things yourself becomes way
more expencive then goin to the next shop.
Luck
Sven Peter
...
of cause, you could generate an analog output from one of the output
lines

> > of the parallel port, by generating a PWM signal on the pin by software
> > means & feeding the output into a suitable R/C network. The output of the
> > network would then be a voltage varying between 0 and +X (where X is the
> > voltage on the pin when outputting a "1"), dependent upon the mark/space
> > ratio of the PWM output...
> >
> > Regards,
> > Tony
>