Gateway interface modules provide a connection between central supervisory control systems and modern building automation networks. Which option correctly describes their role?

• A. They serve as primary sensors.
• B. They implement local control in each room.
• C. They convert analog signals to digital for local controllers.
• D. They allow central supervisory control systems to communicate with modern building automation system networks.

Answer: (D)

Gateway interface modules act as communication bridges between a central supervisory system and the field-building automation networks. Their main job is to translate and relay information across different protocols and data formats so commands from the central control can reach field devices and sensor data can return to the supervisor. This includes handling addressing, data mapping, and often security or filtering, enabling centralized monitoring and control across diverse networks. They are not primary sensors, nor do they implement local room control, and their purpose is not simply converting analog signals for local controllers.