Module fault_parameter

Expand description

BACnetFaultParameter full ASN.1 framing.

BACnetFaultParameter (ASHRAE 135-2020 Clause 21) selects one fault algorithm by context tag and carries its settings; FaultParameters models every alternative. none is a primitive NULL. Every other alternative is a constructed value holding context-tagged members, all required:

Tag	Alternative	Member tag	Member	Type
`[0]`	`none`			NULL, no members
`[1]`	`fault-characterstring`	`[0]`	`list-of-fault-values`	list of CharacterString
`[2]`	`fault-extended`	`[0]`	`vendor-id`	Unsigned16
		`[1]`	`extended-fault-type`	Unsigned
		`[2]`	`parameters`	list of extended values, see below
`[3]`	`fault-life-safety`	`[0]`	`list-of-fault-values`	list of life-safety states
		`[1]`	`mode-property-reference`	`BACnetDeviceObjectPropertyReference`
`[4]`	`fault-state`	`[0]`	`list-of-fault-values`	list of `BACnetPropertyStates`
`[5]`	`fault-status-flags`	`[0]`	`status-flags-reference`	device property reference
`[6]`	`fault-out-of-range`	`[0]`	`min-normal-value`	numeric choice, see below
		`[1]`	`max-normal-value`	the same four-way choice
`[7]`	`fault-listed`	`[0]`	`fault-list-reference`	device property reference

Each “device property reference” is a BACnetDeviceObjectPropertyReference, and the life-safety list holds BACnetLifeSafetyState values. Each extended parameters entry is an application-tagged primitive or a [0]-framed BACnetDeviceObjectPropertyReference.

The min/max inner CHOICE alternatives are untagged — discovered by their APPLICATION tag (REAL=4, Unsigned=2, Double=5, INTEGER=3). The Rust type stores f64, so encode always selects the Double alternative; decode accepts all four.

Functions§

decode_fault_parameters: Decode one framed FaultParameters CHOICE alternative at offset.
encode_fault_parameters: Encode a FaultParameters as its full CHOICE framing.