For systems integrators and head-end engineers putting an OBELISK under a BACnet supervisor or Modbus head-end: what the B-BC profile really implements (read Protocol_Services_Supported first), exposing points with semantics-driven mappings and units, reading efficiently with RPM and COV, archiving TrendLogs with ReadRange that resumes by sequence, routing alarms and acknowledging them so acks attribute, DCC/ReinitializeDevice etiquette and the time-master decision, full backup/restore over BACnet from the OWS, and BACnet/SC, SNMP monitoring and the IT security conversation.