. . . . . The FX-PCA2612-1 Advanced Application Programmable Controller is part of the Facility Explorer Programmable Controller (FX-PC) family. The FX-PCA26 Series controllers run pre-engineered and user-programmed applications and provide the inputs and outputs required to monitor and control a wide variety of HVAC equipment. FX-PCA26 controllers operate on an RS-485 BACnet Master-Slave/Token-Passing (MS/TP) Bus as BACnet Advanced Application Controllers (B-AACs) integrate into Johnson Controls and third-party BACnet systems. FX-PCA26 controllers include an integral real-time clock, which enables the controllers to monitor and control schedules, calendars, and trends, and operate for extended periods of time as stand-alone controllers when offline from the system network.. Johnson Controls. Johnson Controls. FX-PCA2612-1.