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The Cavity-Based X-ray Free-Electron Laser (CBXFEL) project in the Linac Coherent Light Source (LCLS) Hard X-ray (HXR) undulator line requires X-ray beam diagnostics for alignment and optimization of the optical cavity. The instrumentation combines silicon and diamond X-ray Beam Intensity Monitors (XBIMs), direct and amplified signal paths, high-speed digitizers, accelerator timing, and EPICS-based controls. The system acquires beam-synchronous XBIM signals at up to \qty{120}{Hz} and associates each measurement with the corresponding accelerator pulse. This paper describes the system architecture and commissioning results, including crystal alignment, intra-cavity intensity measurements, cavity ringdown, and investigations of detector grounding, signal conditioning, and electrical noise.
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