What is the difference between direct digital control (DDC) and pneumatic control?

What is the difference between direct digital control (DDC) and pneumatic control?

• A. DDC uses analog sensors and pneumatic actuators with no network.
• B. Pneumatic control uses compressed air to move actuators and analog signals.
• C. DDC does not support data logging or remote monitoring.
• D. DDC uses digital sensors/actuators and microprocessors with network communication.

Answer: (D)

Direct digital control relies on digital sensors and actuators connected to a microprocessor-based controller that communicates over a network. This setup enables programmable logic, precise control, data logging, and remote monitoring across the building system. Pneumatic control, on the other hand, uses compressed air to move actuators and generally relies on analog air pressures rather than digital signals, with little to no built-in network capability. So the key difference is digital, processor-based control with networking versus air-driven, analog control without standard network integration.

Direct digital control relies on digital sensors and actuators connected to a microprocessor-based controller that communicates over a network. This setup enables programmable logic, precise control, data logging, and remote monitoring across the building system. Pneumatic control, on the other hand, uses compressed air to move actuators and generally relies on analog air pressures rather than digital signals, with little to no built-in network capability. So the key difference is digital, processor-based control with networking versus air-driven, analog control without standard network integration.