# BACnet Endpoint Properties

## `objectType` (string, enum, required)

Identifier of the BACnet object type of this endpoint

This element must be one of the following enum values:

* `analog-input`
* `analog-output`
* `analog-value`
* `binary-input`
* `binary-output`
* `binary-value`
* `calendar`
* `command`
* `device`
* `event-enrollment`
* `file`
* `group`
* `loop`
* `multi-state-input`
* `multi-state-output`
* `notification-class`
* `program`
* `schedule`

Example: `"analog-input"`

## `objectInstance` (integer, required)

Integer number to describe the concrete object instance that should be accessed

Example: `1`

## `property` (string, required)

The name of this property. The most common property has the name present-value. Other typically available property names are: object-name, description, status-flags, units. On the device object the properties location, object-list and system\_status are typically available

Example: `"present-value"`

## `interval` (integer)

The poll interval in milliseconds

Default: `1000`

Example: `1000`

## `cronExpression` (string)

The Cron expression used to poll the endpoint. (For examples, see: <https://github.com/node-cron/node-cron>)

Examples: `"1,2,4,5 * * * *"`, `"1-5 * * * *"`, `"*/2 * * * *"`, `"* * * January,September Sunday"`

## `priority` (integer)

Only effective during writing to BACnet: Defines the priority (highest: 1, lowest 16 = default)

Example: `16`

Additional restrictions:

* Maximum: `16`

## `propertyTag` (integer)

Only effective during writing to BACnet: Forces the data type of the provided value into the provided BACnet type (called propertyTag). The propertyTag is an integer value (enumeration), please see the documentation for the encoding

Example: `4`