Re: Controlling VFDs from your PC?

>--- In CAD_CAM_EDM_DRO@y..., "audiomaker2000" <audiomaker@s...>

wrote:

> Thanks guys.
>
> That makes me ask....
>
> How do you produce an analog signal of varying voltage from one of
> your computer's ports? I don't know much about this, but from what
> I've read, most pins produce either a "high" or "low" condition
>which
> I can see triggering a relay, but not a variable "pot".
> I suppose this is normally taken care of by the complex electronics
> of a CNC machine, but I am retrofitting with a system that appears
>to
> only produce step and direction signals.
> So how do you turn your computer into a "dimmer" instead of
> a "switch"?
>
>
> Any ideas?

Sean,
What system are you using?
I ask because AHHA is able to output an analog signal 0 - 10V on it's
card to control a VFD. You just take two wires from the port to the
VFD and whatever you program in is then sent to the VFD as a
referance voltage.

John S.