st1 = Stream("st1", dispatcher)
add_device(st1, force = True)
st1.addScalar("SLAAR21-LCAM-C561:intensity")
st1.addScalar("SLAAR21-LCAM-C561:x_fit_mean")
st1.addScalar("SLAAR21-LCAM-C561:y_fit_mean")
st1.initialize()
st1.start(True)
try:    
    bscan (st1, 10, save=False)
finally:
    st1.close()