Re: [CAD_CAM_EDM_DRO] Re: serial vs parallel port

On Wed Nov 5 22:32:49 2003 Don Rogers wrote:

>>In any case,
>>that's plenty fast enough for the job, with lots of room left over for global
>>synching, and more. There are also networking versions, too.
>
>
>I have no doubt that fast serials can handle the speed needed. My question
>though was synchronized movement. IE I tell Axis X to go to Third and Vine
>( serial instruction to that axis), I then tell the Y to go to second and
>Grape ( another serial instruction), I also give another instruction to
>the Z axis to lift from 3 inches to 4 inches ( a third serial
>instruction). It seems to me that each axis will act independent of the
>others to follow their instructions. They might not make the smooth turns
>I wanted, but cut corners instead.
>
>If the serial instructions parsed a move into many parts, calculating the
>path in micro moves, it should work, but a three instruction move
>could result in a path not intended.
>
>It seem to me that the parallel port step/direction movement would be more
>accurate.
>
>Back in the late 60's I went to my first training on computers. I had
>worked on the "unit Record"( electro/mechanical) card processing machines
>before. Things moved fast, but not as fast as the solid state
>computers. I made that jump in realizing how fast things could happen. It
>may be possible I need to make another jump, but for now, I am having a bit
>of a hard time seeing how gross moves can be synchronized with serial
>commands unless they are parsed down into a step/direction on three or four
>axis type movement.
>
>Don

I could be wrong here, but it seems to me that what we're discussing now, is
more of a CAM/post processor problem, than a hardware one. With plenty of
signal lines, and signals to use on them, synching a procedural start should be
a no brainer. Keeping something in synch during an operation, is a controller/
software/driver function.

Bill


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