spindle speed configuration question

Hi all,

I just moved to a spindle after years of using LinuxCNC with a trim router.

Everything seems fairly straighforward, but.....

I'm trying to get PWM to work with my breakout board and .... well...

I set up the basic config, as per the documentation.

speed 1 is 0, PWM 1 is 0
speed 2 is 1000, PWM 2 is 1

If I'm understanding this correctly, this should allow me to go up in speed (S100, S200.... S800, S900) and basically change the analog voltage at my breakout board from 0-10V (My breakout board goes from 0-10V).

And it does... sorta...

It goes backwards! S500 is 5V. S200 is 8V, S800 is 2V. WHY?

That totally worked. No idea WHY, since this is supposed to be a PWM wave and it really shouldn't matter, but... fuck it, it works.

Thanks!

this is for 5axis China mach boards they are activ low designed
and also expect that on the Step dir inputs