Each proxy point typically represents a piece of data in a remote device (see About proxy points). In cases for drivers that support a “learn” mechanism, a proxy point may be created with its facets (units) already defined—these reflect its “Device Facets” (in its ProxyExt).

If needed, you can change the parent proxy point’s facets to use similar (same family) units. For example, if a Lonworks proxy point for a temperature NVI (learned in degrees C), you can change the proxy points facets to degrees F. The “default” conversion performed in the LonProxyExt automatically adjusts the output value appropriately. In this case, facets directly affect the point’s out value.

If you change a proxy point’s facets to use units that are dissimilar from the device facets in its ProxyExt (without also changing its Conversion from “Default”), the proxy point will have a fault status (to show misconfiguration). For example, if its device facets are temperature, and you change the point’s facets to pressure, the point will have a fault status.For details on properties common to the ProxyExt in all proxy points, including Device Facets and Conversion, see ProxyExt properties.