Timeout waiting for APG RCI ready.

I have an interesting problem. Our 6150 intermittently doesn't collect data on a sample or ignores it. The only error message is the following:

"G6150B     1 -310,"({AIH} ):  Timeout waiting for APG RCI ready."  at runtime 0.00 "


I know APG is in regards to the analog cables that are used to synchronize ready\start\stop among all the modules. What is RCI? And has anyone ever debugged this before?


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