Shell With Cutouts for 25-Position D-SUB Connector, C Series Module Shell—The cRIO‑9954 offers OEMs and system integrators a cost-effective solution for developing custom CompactRIO I/O modules. The cRIO‑9954 includes cutout slots for a 25‑pin D‑SUB connector, PCB right‑angle 15‑pin D‑SUB connectors for connecting the module to the CompactRIO chassis, and a 25‑position D‑SUB connector with screws.