For installing technicians: mount the controller and STACK I/O, get the three ethernet ports right, commission point-by-point with timed overrides and printed evidence, generate wiring diagrams and the Commissioning Schedule, run Modbus RTU/ASCII or BACnet MS/TP on COM1/COM2 (one protocol per port), stand up the BACnet server, poll remote BACnet/IP and Modbus TCP devices with the fieldbus client, and hand over with backups you can trust — downloaded, pushed off-device by SFTP, and the signed change-over SD card fitted in the running controller. Everything happens in a web browser — nothing to install.