code: def move_position(self, dx, dy, speed=None):
          ''' Move chuck relative to actual position in um'''
          if speed:
              self._intf.write('MoveChuckPosition %1.1f %1.1f R Y %d' % (dx, dy, speed))
          else:
              self._intf.write('MoveChuckPosition %1.1f %1.1f R Y' % (dx, dy)f move_position(self, dx, dy, speed=None):
          ''' Move chuck relative to actual position in um'''
          if speed:
              self._intf.write('MoveChuckPosition %1.1f %1.1f R Y %d' % (dx, dy, speed))
          else:
              self._intf.write('MoveChuckPosition %1.1f %1.1f R Y' % (dx, dy))
docs: Move chuck relative to actual position in um