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The attachment BACnetDetect.zip (which can be unpacked and for XML import imported) contains the S.BACnet_UdpDetect picture along with auxiliary objects:

• communication process BACRT.KOM
• line L.BACnetRouter
• station B.BACnet_LD_UDP with BACnet protocol (after XML import, it is necessary to set the device IP address)
• I/O tags M.LD_WhoIs_UDP and M.LD_Txt_UDP
• auxiliary objects (structure definitions and status text)

The schema implements the following functionality:

• After clicking the "Query Device" button, it queries the Object Identifier of the Device type object in the BACnet device (using the I/O tag M.LD_WhoIs_UDP and dynamic address change).
• After clicking the "Query Objects" button, it queries the list of objects that are found (using the I/O tag M.LD_Txt_UDP and dynamic address change).
• After setting a specific object type (2 in a screenshot below) and object instance number (4186112 in a screenshot below) and clicking the "Query Obj Properties" button, it will query a list of supported attributes and their values ​​(one of the buttons cycles through properties 1-511, the other 512-8192). Different object types have different attributes implemented; some are mandatory by the standard, others are optional; vendors can also implement their own attributes.