How do I perform the initial setup and boot-up of the TC300 thermostat?

The thermostat automatically powers up after mounting on the wallplate. During boot-up, you'll navigate through several configuration screens: assigning a device name, connecting to network (BACnet MS/TP or Modbus), selecting temperature units, setting date and time, configuring equipment type, setting system switch, configuring occupancy setpoints, creating an installer passcode (4-12 characters with alphanumeric/symbol), entering service information, and optionally setting up user management. (Pages 35-42)

From the official Honeywell Set Home Thermostat manual, page 35

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