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FS-8700-21 LonWorks Manual Page 25 of 72

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Appendix A. Useful Features

Appendix A.1. Using UNVT’s

UNVT’s are User-defined Network Variable Types and are defined in the configuration file by filling the SNVT_Type field with

“UNVT”. The UNVT’s size in bytes should also be added to the UNVT_Byte_Length field and the UNVT’s type number in the

UNVT_ID field. Valid UNVT_IDs are 0 and the range 146 to 255. The UNVT_ID value will be substituted with the default value

of 0 if the field is left empty. Refer to the example in Section 7.2.3

Appendix A.2. Using NV_Min, NV_Max etc.

The NV_Min_Value, NV_Max_Value functionality were added to stop the propagation of ‘out of bounds’ network variables

across a LonWorks network. NV values higher than assigned by the NV_Max_Value field or lower than assigned by

NV_Min_Value field will not be sent out on the network or copied to their relevant Data Arrays. If one or both of these fields

are not assigned values, limit checking will not be performed on that particular field. This functionality applies only to SNVT's

of either Floating point or Integer formats. Refer to the examples in Sections 1.1.1 and Appendix A.6.1.

One or both of these fields can be linked to a configuration network variable update input in order to create an interoperable

configuration property. For further information refer to Appendix A.5