The ACI Accelerator Control Interface is a robust control system designed to interface a particle-therapy accelerator with up to three treatment rooms plus a “room 0” staging area. It routes analog beam current commands and fiber-optic signals from the treatment rooms to the accelerator and collects monitoring data (beam current read-back, compliance voltage, energy frequency, interlock status) for high-speed diagnostics. With standard Ethernet access and a web-browser interface for remote monitoring, the ACI delivers deterministic high-isolation communication paths, beam-stop control and high-performance interlock integration in demanding accelerator environments.