HisMode

Indicates the way that history data is collected for a point.

Data is sampled on a regular interval. The timestamp indicates exactly when the sample was taken, and we assume linear interpolation between samples.

Data is logged when it changes. The means the timestamp indicates exactly when it changed (inclusive) and it remains that value until the next sample's timestamp (exclusive).

Integral data is sampled on a regular interval and logged at the end of the interval. The timestamp indicates the end of the interval. Therefore, the raw data is logged as start exclusive, end inclusive. This is mode is typical for consumption meters.