The new design upgraded the BAS system to a fully operational direct digital control
(DDC) system with a Web-based graphical front end to provide increased monitoring capability, remote access and control.
Johnson Controls used personal environmental modules, highly integrated direct digital controls
, as well as other technologies for an extensive renovation/new construction of its headquarters in 2009.
* Upgrade building controls, particularly by replacing pneumatic controls with direct digital control
While the transition from springs, diaphragms, and mercury switches to networked direct digital control
(DDC) has been remarkable, the groundswell response to BACnet has revolutionized the building automation industry.
As part of the direct digital control
system, the controls contractor installed the following equipment (Figure 1):
Users of building direct digital control
(DDC) systems do not care about what communications technologies are used by the industry.
There is no doubt that direct digital control
(DDC) has transformed the HVAC industry.