Each server item within our NETx Server has a quality. This item quality reflects the quality of the item's value i.e. whether the current value of the item can be trusted or not. If the quality is "GOOD", the values are shown as green within the Server Item Tree – if they are not good ("UNCERTAIN" or "BAD") they are shown as red and value is replaced by ???.
If a BACnet items is shown as "not good", there can be different reason for that.
BACnet device is offline
If the BACnet device is offline, all corresponding BACnet objects i.e. server items are shown as UNCERTAIN. In that case, the corresponding GATEWAY item shows False:
The reason can be that the device is not reachable via not work or that the BACnet device status of the device is not "operational". The device status can be verified by clicking at the device within the Item Tree and search for the Item Property "system-status".
The device status is specified by the BACnet standard. For more details about possible system-status values take a look at the BACnet specification and at the datasheet / user manual of your BACnet device.