Any chance that the problem is at the other end, i.e., are you sure your analog acq. is configured properly to use the RTSI signal? Here's a suggestion for debugging:
1. Run your program that tries to send the signal onto the RTSI bus.
2. In a separate program, config a different 6602 counter for event counting and specify the RTSI signal as the source. If this fails, your original counter isn't putting its output onto RTSI, either due to a failed board or config issues which you are already pursuing. If it works, proceed to the next step.
3. Config a counter on your MIO board for the same kind of event counting using the RTSI signal as a source. If this fails (after step 2 worked), check your RTSI cable connection inside your PC (w
ith the power off!). If it works, then RTSI is getting to your MIO board and the problem may be in the way you're configuring analog acq. to use the RTSI signal.
Good luck!
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