Which force gives the scale reading?

[MIA6]

An elevator is at rest with a bag hanging from a spring scale. My question is Which force gives the scale reading? The mg (the weight of the bag) downward or the force exerted by the scale on the bag Fn gives the scale reading?
thanks.

 

[Antineutron]

Read carefully, the elevator is at rest. Does that mean is there are other forces involved on the bag besides gravity?

 

[MIA6]

Read carefully, the elevator is at rest. Does that mean is there are other forces involved on the bag besides gravity?

Since elevator is at rest, there is only gravity, and then I think there is a normal force reacting to the gravity.