If I remember correctly from working on the driver was that the controller handles step count as 16-bit value so the maximum step count is 65535 and then it would wrap to 0. Unfortunately there is no command to sync/set the step count to a lower value like many other controllers have so the only way to lower it is to run the focuser in a bit (to maybe 50000 or so) and then move the focuser out manually to the focus point so that the values when searching for focus are lower.

Read More...