If we are not showing the 43000 series it is probably that it was an older model series and thus we might have not tried it before. I looked in the Haydon website and could never find the 43000 series, only the 46000 and the specs for those seem to be controllable using our boards. If you have the specs for the stepper motor you want to control we might be able to tell you if it is possible to do it.