Return the Dynac representation of this steerer instance.

def dynacRepresentation(self):
        """
        Return the Dynac representation of this steerer instance.
        """
        if self.plane.val == 'H':
            p = 0
        elif self.plane.val == 'V':
            p = 1
        return ['STEER', [[self.field_strength.val], [p]]]