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The typical communication protocol used in building automation systems includes BACnet and Modbus, which are specifically designed for the control and automation of building systems. BACnet is a data communication protocol that facilitates the integration and interoperability of various devices and systems within a building, such as HVAC, lighting, and security systems. It allows for efficient management and monitoring, enabling different manufacturers' devices to communicate with each other effectively.

Modbus, on the other hand, is a widely used protocol in industrial and building automation for connecting electronic devices. It is simple and reliable, making it suitable for various applications where devices need to communicate over a network, especially in environments like building management.

The other options listed—FTP or HTTP, Wi-Fi or Bluetooth, and RS-232 or RS-485—serve different purposes and are not typically used as primary communication protocols for building automation systems. FTP and HTTP relate more to file transfer and web communication, while Wi-Fi and Bluetooth are wireless technologies that, while they can be utilized in some building applications, are not the mainstay protocols for automation communication. RS-232 and RS-485 are serial communication standards that are often used for connecting devices, but they do not provide the extensive interoperability and features that BACnet and Modbus offer