cur-point – Project Haystack

def

cur-point

Point with support to report a "real-time" current value. By real-time we typically mean freshness within the order of a few seconds or at most a few minutes. For systems with direct I/O the current value is typically driven by the I/O scan rate. For overlay systems which acquire data via a protocol such as BACnet or Modbus then the current value is typically refreshed using polling or subscription over a network. Also see Points chapter.

conjunct

cur

Supports current value

point

Data point such as a sensor or actuator

meta

usage

cur  point

supertypes

marker

Marker labels a dict with typing information

    entity

Top-level dicts with a unique identifier

        point

Data point such as a sensor or actuator

tags

cur

Supports current value

curErr

Error description when curStatus indicates error condition

curStatus

Status of point's current value reading

curVal

Current value of a point

dis

Display name for an entity

enum

Defines an eumeration of string key names

equipRef

Reference to equip which contains this entity

his

Supports historization of data

id

Defines the unique identifier of an entity in system using a ref value type

kind

Kind name used before Haystack 4.0 to identity data types

maxVal

Inclusive maximum for a numeric value

minVal

Inclusive minimum for a numeric value

siteRef

Reference to site which contains the entity

spaceRef

Reference to space which contains this entity

tz

Timezone identifier from standard timezone database

unit

Unit identifier from standard unit database

vfd

Variable-frequency drive

writable

Supports writing data