This section applies to U.S. installations only.

Lonworks devices use SNVTs and SCPTs to exchange data, which typically use International System of Units (SI), such as degree Celsius ˚C for temperature, l/s (liters per second) for volumetric flow, and so on. Consider these the “native” units, in which numeric values are exchanged between devices.

In U.S. installations (only), you typically want to convert “metric” values to “English” values for the user interface, such as degree Fahrenheit ˚F for temperature, cfm (cubic feet per minute) for volumetric flow, and so on. If engineering a U.S. installation of a LonNetwork, it is important to understand the available unit conversion options, described in the following sections: