UNC stops communicating with LonWorks devices

Issue

UNC stops communicating with LonWorks devices. The following messages are seen in the UNC's standard output.

Opened lon / LON1
>>> Lon Driver opened!
 
ERROR: readProperty() failed for property
tridiumx.lonworks.LonException E_LON_INVALID_MSG_CODE
Opened lon / LON1
>>> Lon Driver opened!
Opened lon / LON
>>> Lon Driver opened!
Opened lon / LON1
>>> Lon Driver opened!

Product Line

TAC I/A Series

Environment

I/A Series UNC-520 LonWorks communications

Cause

The standard output of the UNC shows that the UNC LON port and LON driver were successfully opened and indicates no error. The cause of the problem is unknown at this time. 

Resolution

Current workaround is as follows:

  • In the UNC station, go to Services > LonWorksService > LonDeviceManager.
  • Select the LocalLonDevice and Commission it.