Re[2]: [CAD_CAM_EDM_DRO] EMC signal output

Hello Jon,

How do you know what kind of machine I have ?

As far as I know I need a pulse like that and now I need to know how
to do that. Do I have to write some C-code or is there any settings on
that?

You mentioned your "step rate generator". Where I can get that, if I
can get that?

--
Cryo - Cryo@...

--- Original Message ---
JE> Cryo wrote:

>> I didn't find any documentation about EMC's port settings.
>> Can I change step/dir signal polarity easily somewhere?
>> My driver needs signal which is normally down and when step coms is
>> up.
>>
>> Another thing is timing. Can I change pulse width and other that kind
>> of stuff somewhere?
>> I need signal which is like this:
>>
>> step |---| |---|
>> ----| |-------| |----
>>
>> dir |-------| |-------|
>> ---| |---| |-
>>
>> I put oscilloscope to EMC output and it's like:
>>
>> step |---| |---|
>> ----| |----| |----
>>
>> dir |------------|
>> ----| |----
>>

JE> I don't see the problem here. It should be legal for the direction
JE> signal to stay at the same polarity if two consecutive steps will be in
JE> the same direction. The only concern is that the direction signal does not
JE> change too close to the active edge of the step signal (which can be the
JE> rising or falling edge, depending on the step driver).

JE> The polarity of the step signal is also not generally important, except
JE> for the relationship to changes in the direction not ocurring too close
JE> to the active transition.

JE> My parallel port step rate generator does allow the width of the step
JE> pulse, as well as the setup time delays around the active edge of the step
JE> signal to be controlled. I will probably put polarity switching logic
JE> in the final version of this.

JE> Jon


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