Direct digital controls, or DDCs, are defined as computer-based systems that manage and monitor the mechanical and environmental systems within a building. These systems are designed to optimize the performance of a building’s HVAC, lighting, security, and other critical systems.
DDCs were first introduced in the early 1980s as an alternative to the traditional pneumatic controls that were commonly used to manage building systems. Pneumatic controls relied on air pressure to operate valves and actuators that controlled the flow of water, steam, or air within a system. While these controls were effective, they suffered from a number of drawbacks. They were often inaccurate, susceptible to temperature extremes, and difficult to maintain.
DDCs offered a more reliable and accurate way to control building systems. By using digital signals instead of air pressure, DDCs could provide more precise control over a system’s operation. Additionally, DDCs could be programmed to automatically adjust a system’s operation based on changing conditions within the building.
Over time, the capabilities of DDCs have continued to evolve. Today’s DDCs can be connected to the Internet, allowing them to be monitored and controlled remotely. They can also integrate with other building management systems, such as those that control entry into the building or monitor energy usage.
