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Steppers only go forwards

Posted by Grogyan 
Steppers only go forwards
March 19, 2010 01:29AM
I am having a serious problem with my Gen 3 electronics.

All my steppers will only drive forwards when jogged in the RepRap host.
When I reverse the direction and jog a stepper driver backwards (any number above zero), nothing happens.

I have tested the Dir pin, and it is being held low to indicate backwards movement, and high when driven forwards.
I have also used simple G-Code that just drives only the steppers forwards and backwards, the effect is that they are only going forwards, no backwards movement

I have also tried updating the firmware, same thing happens.
I'm using RepRap host 20090804 with Java 1.5.21

I have absolutely no clue why this is happening, and I could use some help please figuring this out.
Re: Steppers only go forwards
March 19, 2010 05:05AM
The firmware must think the end stops are triggered. It won't move backwards if it thinks it is already at the end.

Have you got end stops attached?

Re: Steppers only go forwards
March 20, 2010 01:01AM
Thanks, thats what I did wrong, no end stops.

I knew it was something so simple.
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