I am starting to play with the onstep (stm32 based) coupled to a SHC (Teensy based). I think I have sort of figured out the SHC menus but I cannot find info on what looks like an "Err ?" icon that happens sometimes when I slewing the mount around (I am doing this testing on the bench, not the field). I have found info on other Err xx codes, but not the ?....any clues on what that is telling me.
