Issue
The Dynamic DEMUX object in the R2 LonWorks jar (Conversions folder) appears to incorrectly set output bits for certain SNVT_State values, causing confusion when interpreting state information.
Product Line
TAC IA SeriesEnvironment
Niagara R2(all versions)
Cause
The discrepancy occurs because some third-party manufacturers define SNVT_State bits starting from bit15 on the left, counting down left to right. In contrast, the Dynamic DEMUX object assigns bits from bit0 to bit15, with bit0 on the left and counting left to right.
Resolution
- Understand the bit assignment logic used by the Dynamic DEMUX object:
- For example, a SNVT_State value of
1000 hexequals1000000000000000in binary. - The DEMUX object interprets this as bit0 ON.
- For example, a SNVT_State value of
- If third-party documentation indicates bit15 ON for the same value, this is due to their reversed bit numbering convention.
- Once this difference is understood, interpret DEMUX output bits accordingly.
