# OPC DA Endpoint Properties

## `tag` (string)

The name of the tag that should be accessed. Use this property for a single tag, or alternatively the tags property for multiple ones.

Examples: `"Random.Real4"`, `"Triangle Waves.Int2"`

## `type` (string, enum)

The type of the tag

This element must be one of the following enum values:

* `DATE`
* `CURRENCY`
* `VARIANTBODY`
* `VARIANT`
* `DOUBLE`
* `COMARRAY`
* `BOOLEAN`
* `SHORT`
* `INTEGER`
* `FLOAT`
* `STRING`
* `UUID`
* `BYTE`
* `LONG`
* `CHARACTER`
* `INTERFACEPOINTER`
* `INTERFACEPOINTERBODY`
* `DISPATCH`
* `COMOBJECT`
* `POINTER`
* `STRUCT`
* `UNION`
* `COMSTRING`
* `UNSIGNEDBYTE`
* `UNSIGNEDSHORT`
* `UNSIGNEDINTEGER`
* `DUALSTRINGARRAY`

## `tags` (array)

An array of names of the tags that should be accessed. Use this property for multiple tags, or alternatively tag for a single one.

The object is an array with all elements of the type `string`.

Example: `["Random.Real4","Triangle Waves.Int2"]`

## `browse` (string, enum)

The method for browsing this OPC DA server. Use this property if the endpoint should serve as a browse endpoint, alternative to the tag or tags endpoint.

This element must be one of the following enum values:

* `flat`
* `tree`

Default: `"flat"`

## `interval` (integer)

Polling interval in ms for subscriptions

Default: `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"`