[WizenedEE]

Do you mean the module? The blue piece with the silver sides that plugs into the CRIO itself? It should be plugged into the CRIO such that both of the metal sides are snapped in and flush with the walls of the CRIO. If they're not, push it in farther (but be careful).

Another thing that might be going wrong is if the module is plugged into the wrong slot. It MUST be plugged into slot 4 (counting from the part of the CRIO with the ethernet porst and such) or else the RSL will not work.

You could also try replacing the module (I believe the CRIO comes with two digital modules).

Did you say that the LED only flashes if the RSL is hooked up? That's bad, but I have no idea how to fix it (bar what's already been said in the thread).