The plus is connected to the doorbell and the two inputs of the SAX35. The minus is connected to the camera and the doorbell button. From the doorbell button to the first input on the SAX35 (and the doorbell), and from the camera to the second input of the SAX35.
When the doorbell rings, both inputs of the SAX35 gets activated. If there is motion detected, both inputs are detected and the doorbell rings ...

What am I doing wrong? Hopefully I do not have to get two seperate power supplies?