Shell With No Cutout for Custom Connectivity, C Series Module Shell—The cRIO‑9953 offers OEMs and system integrators a cost-effective solution for developing custom CompactRIO I/O modules. The cRIO‑9953 has no cutouts for connectors, so you can choose the connectivity of your custom module. It also includes PCB right‑angle 15‑pin D‑SUB connectors for connecting the modules to the CompactRIO chassis.