Starting in AX-3.5, the Bacnet Device Manager provides a 
button that may let you change the Device ID (Object_ID property of its Device object) in one or more selected remote BACnet devices. To work, devices must be in the station and
reachable (OK status), and accept a change to Device ID. If a device does not accept a change to Device ID, the function fails with a popup describing why, typically “write access
denied”.
This function can be useful where “out of the box” BACnet controllers have been installed, all with some identical Device ID. In this case, such controllers appear in fault (orange) in the Discover pane (see Figure 23).
When added, such devices will remain in fault (or down) unless Device ID is changed in the device, with a corresponding change in the (Config) Device Object’s “Object Id” property of the BacnetDevice in the station. This function provides a way to do all this all in one step—again, providing that the BACnet device accepts changes to Device ID.
Note that merely changing the “Object Id” property in a BacnetDevice’s Config, Device Object does not write to the actual device, it only determines how the station communicates with the device.
The 
button becomes enabled with one or more devices selected in the Database pane. When you click it, a pre-confirmation dialog
appears (Figure 28).
If you choose , a popup dialog appears, shown in Figure 29.
As shown above, this dialog has two fields:
-
Name
The Device object’s Object_Name in the BACnet device. Editable if only one device selected.
-
Device ID
The Device object’s Object_ID in the BACnet device.
In this second field you can enter a new numerical Object ID value, which must be unique across the job’s BACnet internetwork. The valid range is from 0 to 4194302.
If you’ve selected multiple BacnetDevices, this function will assign new Device IDs sequentially, starting with this number.
For example if you have three devices selected and “62” entered, it will attempt to change Device IDs to 62, 63, and 64 amongst
the three devices.
Clicking shows a summary of the Device ID changes to be made, as shown in Figure 30.
Clicking launches a “Change Device Id Job”, with an entry in the station’s JobService. The job ends with a popup notification that explains whether the Device ID change was successful or not (Figure 31).
