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

If you want to try controlling your VFD from a spare serial port - B&B
Electronics www.bb-elec.com have a product No. 232SPDA for $89 which may
be helpful. I've not used this product, but have used many other
products of theirs and they work well and are easy to get going etc.,
plus they provide good tech support if you get stuck.

They are generous with sending free catalogues if you make a request.

Cheers, Peter


stevenson_engineers wrote:

>>--- 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.
>
>
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