Niagara R2 LON Integration Error: Wrong NV Direction for nvUpdate

[Product_Support]

Issue

When integrating LON with Niagara R2, the following error appears in the Standard Output Window:

{lon} Wrong Nv direction for nvUpdate from {lon}MNV2_16(1/17) for Selector 132.

Product Line

TAC IA Series

Environment

• Niagara R2
• LON

Cause

The error occurs due to a mismatch between the Lon network management tables in the Niagara R2 UNC station and the actual configuration in the controllers on the bus.
Common reasons include:

• Controllers offline during network binding changes
• Rogue controllers with duplicate domain, subnet, and node IDs

Resolution

1. Verify Errors

   • Run Lon Utilities Manager (right-click on LonWorks service)
   • Select the local Lon device
   • Use Command Reports → Verify to compare UNC tables with controller values

2. Correct the Issue

   • Re-commission the local Lon device
   • Re-commission all controllers
   • Perform a bind to clear tables, recalculate selectors, and rewrite bindings

3. Confirm Resolution

   • Run Reports → Verify again to ensure no further errors