Reverting to the legacy CPU usage for BACnet networks

For controllers running Niagara 4.12 and later, the MS/TP engine is located, by default, on the controller’s RS-485 co-processor. This task describes how to configure the .platMstp-BacnetMstpPlatformServiceQnx module so that the MS/TP engine runs on the controller CPU instead.

You are working in Workbench and are connected to a platform and running station on a properly configured BACnet Network.
The BacnetMstpPlatformService is hidden by default. This procedure explains how to make it visible under PlatformServices, and how to disable the coprocessor.
  1. Expand the controller station’s Station > Config > Services, right-click the PlatformServices and select AX Slot Sheet from the popup menu.
    The PlatformServices AX Slot Sheet view opens.
  2. Right-click the BacnetMstpPlatformServiceQnx and select the Config Flags menu item.


    The Config Flags window opens.

  3. Clear the Hidden property check box and click OK.
    The BacnetMstpPlatformService component displays under PlatformServices in the Nav tree.
  4. To display the Use Coprocessor property, right-click BacnetMstpPlatformServiceQnx, choose its AX Slot Sheet, right-click useCoprocessor, select Config Flags from the popup menu, clear the Hidden property check box and click OK.
    The useCoprocessor property is now visible in the Platform Service Properties view.

  5. Double-click the BacnetMstplatformServiceQnx node in the Nav tree, set Use Coprocessor to false and click the Save.
  6. Restart the station to finalize the change in processing location.