On demand properties in history import descriptors

When using the Niagara History Import Manager to import remote histories, there are two properties in a NiagaraHistoryImport descriptor related to “On demand” polling:

On Demand Poll Enabled

Either true (default) or false.
- If true, a system user will be able to use the “Live Updates” (play) button in history views to poll for live data for the associated imported history(ies).
- If false, this button will not be available in history views for the associated imported history(ies).
On Demand Poll Frequency

Either “Fast”, “Normal”, or “Slow”, which references the “On Demand Poll Scheduler” rates under the NiagaraNetwork’s “History Policies” container slot. See History Policies for related details.