What is a ModDef document?
A ModDef document is a declarative description of a device: its identity, its
Types & storage
A point separates how the value is stored on the wire from what it means
Transforms & scaling
A raw register rarely is the engineering value. A transform turns the
Measurands
An address tells you where a value is. A measurand tells you what it is.
Writing & constraints
Points that control the device carry an access mode and, when writable,
SunSpec discovery
Most register maps are static: a point lives at a fixed offset. SunSpec devices