Starting in AX-3.8 and “update releases” of AX-3.7 and AX-3.6, each NiagaraAX control point exported to BACnet is automatically
given an “outOfServiceExt”. The extension has two properties:
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Out Of Service — (Boolean), by default is false. If set to true, the point’s current value is written to the Present Value property (below). Often, a remote BACnet client sets (or clears) this “Out of Service” state.
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Present Value — While “Out Of Service” is set to true, reflects the last written “Present Value”.