Error: "Unable to change the state of the network interface. (Subsystem NI, #31)" (KB409)

Question Detail

When I was trying to open a new (or existing) network using the LonMaker tool or an another LNS application, I got an error message saying "Unable to change the state of the network interface. (Subsystem NI, #31)" and I could not open the network. Why?


i.LON 100 or SmartServer:
There are two types of RNIs, "Other" and "LonScanner". For LonMaker (or a LNS application), you must use the "Other" RNI. For LonScanner, you must use the "LonScanner" RNI. Check the interface setting in the LonWorks Interface Applet which is available in the Windows Control Panel. Select the RNI tab and double click the RNI you are using. If the interface setting is set incorrectly, change it to the correct one and press the Apply button.

PCC-10 or PCLTAs:
The LonMaker tool works with NSI or "VNI" NI application images, i.e., PCL10VNI or NSIPCLTA. To eliminate this error message, open the LonWorks Plug 'n Play utility from the Control Panel and check your NI Application. If it is "PCC10L7", it needs to be changed to PCL10VNI or NSIPCLTA. Hit Apply to change the image, then go ahead and open the network again.

Related Products
  • i.LON 100 e2 (Ver 1.1)
  • i.LON 100 e3 (Ver 3.0)
  • i.LON SmartServer
  • LonMaker 3.0
  • LonMaker 3.1
  • LonMaker Turbo (Ver 3.2)
  • LonScanner FX Protocol Analyzer
  • LonScanner Protocol Analyzer 3.0
  • PCC-10
  • PCLTA-10
  • PCLTA-20
  • PCLTA-21
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