Module event_parameter

Expand description

BACnetEventParameter full ASN.1 framing.

BACnetEventParameter (ASHRAE 135-2020 Clause 21) selects one event algorithm by context tag and carries that algorithm’s settings. Each alternative that BACnetEventParameter models is a constructed value under its own tag, holding context-tagged members that are all required:

Tag	Alternative	Member tag	Member	Type
`[0]`	`change-of-bitstring`	`[0]`	`time-delay`	Unsigned
		`[1]`	`bitmask`	bit string
		`[2]`	`list-of-bitstring-values`	list of bit strings
`[1]`	`change-of-state`	`[0]`	`time-delay`	Unsigned
		`[1]`	`list-of-values`	list of `BACnetPropertyStates`
`[2]`	`change-of-value`	`[0]`	`time-delay`	Unsigned
		`[1]`	`cov-criteria`	`[0]` bit string or `[1]` REAL, see below
`[4]`	`floating-limit`	`[0]`	`time-delay`	Unsigned
		`[1]`	`setpoint-reference`	`BACnetDeviceObjectPropertyReference`
		`[2]`	`low-diff-limit`	REAL
		`[3]`	`high-diff-limit`	REAL
		`[4]`	`deadband`	REAL
`[5]`	`out-of-range`	`[0]`	`time-delay`	Unsigned
		`[1]`	`low-limit`	REAL
		`[2]`	`high-limit`	REAL
		`[3]`	`deadband`	REAL
`[9]`	`extended`	`[0]`	`vendor-id`	Unsigned16
		`[1]`	`extended-event-type`	Unsigned
		`[2]`	`parameters`	list of extended values, see below

cov-criteria is either [0] bitmask (a bit string) or [1] referenced-property-increment (a REAL). Each extended parameters entry is an application-tagged primitive or a [0]-framed BACnetDeviceObjectPropertyReference.

Four tags carry no alternative here. Tag 6 is skipped because it would mirror the proprietary complex-event-type notification alternative, and tag 19 is skipped because change-of-reliability has no event parameters. Tag 7 is deprecated and tag 12 is reserved.

Alternatives with no Rust model (command-failure [3], change-of-life-safety [8], buffer-ready [10], unsigned-range [11], access-event [13], *-out-of-range [14..=16], change-of-characterstring [17], change-of-status-flags [18], none [20] NULL, change-of-discrete-value [21], change-of-timer [22], vendor tags) are preserved byte-for-byte through BACnetEventParameter::Opaque. The omitted/deprecated/reserved slots 6, 7, 12 and 19 are rejected on decode.

Functions§

decode_event_parameter: Decode one framed BACnetEventParameter CHOICE alternative at offset.
encode_event_parameter: Encode a BACnetEventParameter as its full CHOICE framing.