What is Direct Digital Control (DDC)?

 What is Direct Digital Control (DDC)?

Direct Digital Control is a control technology that uses digital microcontrollers to automatically manage processes like temperature and pressure or respond to specific conditions (logic). Widely adopted by the HVAC industry, DDC technology enables precise control along with features such as programmability, network connectivity, data exchange, and remote management.
Components of DDC Control Systems
A complete DDC-based control system consists of three main components: input devices, DDC controllers, and output devices.
The input devices in a DDC-controlled HVAC application are typically sensors such as those measuring temperature, humidity, CO2, static pressure, flow, current, and switches. The output signals from these sensors vary by manufacturer but generally include 0 to 5 volts, 0 to 10 volts, 4 to 20 mA, or resistive signals (e.g., 10 KΩ for temperature). These sensor outputs are connected to the DDC controller inputs via control wiring.
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