Building sensor with self-configuring analog output circuit with fault detection

A building system of a building, the building system comprising:

• a building controller comprising an input connection, wherein the input connection is associated with an input impedance, wherein the building controller is configured to receive an analog current input or an analog voltage input via the input connection and perform one or more control actions based on the analog current input or the analog voltage input;
• and
• a building sensor comprising one or more circuits configured to:
• detect a feedback voltage, the feedback voltage based on the input impedance;
• determine, based on the feedback voltage, whether the building controller is configured to receive the analog current input or the analog voltage input from the building sensor;
• and
• generate the analog current input or the analog voltage input based on a condition measured by a sensing device and provide the analog current input or the analog voltage input to the building controller.

A self-configuring analog output circuit of a sensor, the self-configuring analog output circuit comprising one or more circuits configured to:

• detect a feedback voltage, the feedback voltage based on an input impedance of an external device connected to the self-configuring analog output circuit;
• determine, based on the feedback voltage, whether the external device is configured to receive an analog current input or an analog voltage input from the self-configuring analog output circuit;
• and
• generate the analog current input or the analog voltage input based on a condition measured by a sensing device of the sensor and provide the analog current input or the analog voltage input to the external device.