Shell With Cutouts for 4 BNC Connectors, C Series Module Shell—The cRIO‑9956 offers OEMs and system integrators a cost-effective solution for developing custom CompactRIO I/O modules. The cRIO‑9956 includes cutouts for four BNC connectors and a PCB right‑angle 15‑position D‑SUB connector for connecting the module to the CompactRIO chassis with screws.