RE: [CAD_CAM_EDM_DRO] EMC questions

At 08:22 14/07/2003 -0600, you wrote:

> > "Stepper motor control is implemented using a second real-time task
> > that runs at 100 microseconds. This task writes the parallel port
> > output with bits set or cleared based on whether the a pulse should
> > be raised or lowered. This gives an effective period of 200
> > microseconds for a full up-and-down pulse, or a 5 kilohertz
> > frequency."
>
>Like much of EMC documentation you can not believe all that you read.
>This is not correct. I have EMC running with a pulse stream of 25
>kilohetz. It will actually go somewhat faster depending upon the speed
>of your system. For stepper use you can get the fastest rates with
>steppermod.o, but the pulse stream is not evenly paced. You will get a
>better pulse stream pacing with freqmod.o, but it take more system
>resources. On the system you are running either one of the motion tasks
>will give you a much higher rate than 5 Khz if you tune it properly.

Isn't it comforting to hear yet more evidence of how user-friendly EMC
is... ;-)


Regards,
Tony