FX-PCA Series Controllers are programmable controllers that can communicate using BACnet®/IP, MS/TP, or N2 communications protocols, depending on the model. The FX-PCA4911 communicates using BACnet/IP communications protocol, and is a BACnet Advanced Application Controller (BAAC). The other FX-PCA Series controllers can be switched between MS/TP and N2 Communications protocols and when used as MS/TP devices are BACnet Advanced Application Controllers (B-AACs).

FX-PCA Series Controllers can also operate as stand-alone controllers in applications that do not require a networked supervisory device or for network applications where it is preferred to have the scheduling, alarming, and/or trending performed locally in the field controllers.

The FX-PCA4911 communicates using BACnet/IP communications protocol, and is a BACnet Advanced Application Controller (B-AAC). The FX-PCA4911 controllers operate on BACnet/IP networks and integrate into Johnson Controls and third-party systems.The FX-PCA3611 model includes a fast persistence feature that allows data values to be held a configurable value, up to once per second. Persistence refers to how often samples of data are stored locally. In the event of a problem, such as a loss of power, data can be retrieved up to the rate that the data is persisted, minimizing the potential loss of data. When power is restored, previously persisted data, up to the rate of persistence, remains available and accessible. For example, if persistence is configured for once per second, you only risk losing one second of data. Persisting data may be essential for situations that require greater data accuracy, including certain methods of utility data collection and billing.

FX-PCA2612 controller models feature line-voltage relay outputs, making these controllers well suited for use in terminal units. The FX-PCA2612-2 model uses a line-voltage power supply, eliminating the need for a 24 VAC transformer in line-voltage applications.