def set_position(self, x, y, speed=None):
        ''' Move chuck to absolute position in um'''
        if speed:
            self._intf.write('MoveChuckSubsite %1.1f %1.1f R Y %d' % (x, y, speed))
        else:
            self._intf.write('MoveChuckSubsite %1.1f %1.1f R Y' % (x, y))
Move chuck to absolute position in um