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The reason can be that the device is not reachable via not work network or that the BACnet device status of the device is not "operational". The device status can be verified by clicking at on the device within the Item Tree and search for the Item Property "system-status".
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These status flags are also shown as item properties within our NETx Server. To show them, select the BACnet object within in the server item tree and take a look at the item's properties:
In some uses use cases, it is desired to show item value as GOOD even if one of these flags is true. To configure this behavior, open BACnet > Driver Configuration ... and enable the corresponding options. For example, to show the item value as GOOD if the status flag "FAULT" is true, enable the following option:
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