The Johnson Controls FX-PCX3721-0 is a 16-point expansion input/output (I/O) module from the Facility Explorer® FX-PC Series. It supports 16 Binary Inputs (BI) and operates on an RS-485 BACnet® MS/TP or N2 field bus to monitor and control HVAC equipment, typically in conjunction with FX-PCA, FX-PCG, or FX-PCV programmable controllers.
Read More on eBay