Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: RodC on October 29, 2014, 05:22:10 PM

Title: Step Active Low works, board specifies Active High
Post by: RodC on October 29, 2014, 05:22:10 PM

I am converting mill that has a MN400 driver board to a parallel board.  Everything seems to be working great, however, I had to set the motors step signals to Active Low.  The board specifies Active Low.

The board I'm using is a DM8010

http://microkinetics.com/pdfmanuals/DM8010.pdf

From the manual:
Step input signal ............................................... TTL compatible positive edge trigger

And:
Step - used to step the motor. The stepping frequency range is from 0 to 300
KHz. The driver updates the motor position after a LO-to-HI transition
occurs. The minimum pulse width (LO level) should be 2uS

Should I worry or try to correct this.  TIA

Title: Re: Step Active Low works, board specifies Active High
Post by: Hood on October 30, 2014, 04:06:11 AM

What happens when you set it Active High (ie remove green tick) ?

Hood

Title: Re: Step Active Low works, board specifies Active High
Post by: stirling on October 30, 2014, 06:15:56 AM

Easy way to find out. Set an output pin to the same pin as one of your step pulses is on and then with your hand on the motor, execute a few activateSignal(OUTPUT?), deactivateSignal(OUTPUT?) commands in the script editor. You'll feel which one causes the motor to step.

Title: Re: Step Active Low works, board specifies Active High
Post by: RodC on October 30, 2014, 08:00:37 AM

If I set it to Active High the motors will not turn.  You can feel a very small pulse when the direction changes, but no movement.