An air replenishment
system includes a source of air, a plurality of air fill stations, a
piping assembly, a first controller, and a second controller. The source of air is to provide air at an operating pressure greater than or equal to 3000 psig. The
piping assembly is coupled with the source of air to provide the air to the plurality of air fill stations. The first controller is to monitor at least one first condition associated with the air. The second controller is to receive a state
signal regarding a state of the first controller over a first connection between the first controller and the second controller, and to transmit to a
fire control panel, over a second connection, a fault
signal of at least one of the first condition and the state of the first controller.