Machsupport Forum
Third party software and hardware support forums. => Mach3 and G-Rex => Topic started by: ich-bin-du on November 12, 2011, 11:52:47 AM
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Hello,
Can anybody tell me, how long the DIR Pulse for the X,Y or Z takes "High" in mach3?
In Motor tuning is written down, that I can take a time between 1 and 5µs, but I can write down 7 or 8. is the signal then 7 or 8µs long or only 5µs?
I hope you understand my bad english
Greetings
Michael
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Hi Michael,
The values entered in those fields is the amount of time to be added to the standard pulse width (around 3uSec). So if you enter 5 there you will get an 8uSec pulse width. I think it is only true for the step pulse, the direction signal being just a change of state, but am not sure about this as some time ago someone was reporting a different behaviour (although with SmoothStepper) which was never confirmed by other users.
If you need a wider pulse than that then use Sherline Mode (under Ports and Pins), which will give you around 20uSec pulse width.
Dan
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Hey
Oky thanks, that was it, i was looking for ;)
greetings
Michael
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The values entered in those fields is the amount of time to be added to the standard pulse width (around 3uSec). So if you enter 5 there you will get an 8uSec pulse width.
Are you sure? I've never heard this before.
If you need a wider pulse than that then use Sherline Mode (under Ports and Pins), which will give you around 20uSec pulse width.
I believe Sherline mode is 40us pulse width.
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Hi Gerry,
I am only sure I remember Art or Brian mentioning it, but whether it's really the way it works I don't know.
Regarding Sherline mode, I am sure about it, as half the cycle time at 25Khz kernel is 20uSec ;)
Dan