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Update: Support for the above was added to control.py and pushed to the git repo on 3/10/22.

NOTE: If we couple all readout-group deadtime then we don't learn how many high-rate shots we drop with integrating detectors, but Matt suggests putting in a counter in the timing stream that counts the number of deadtimed-events and attaches that counter to the data stream when it can readout: the counter will often be zero, but will be non-zero in the case where we have deadtime.  Matt points out that MPS can effectively the rate of beam, so we can't depend on a fixed-rate beam.

PROPOSAL: Couple all readout deadtime which is conservative (like BaBar) and see how we do.  Up until now (Jan. 18, 2023) we have not done this, and it meant that different readout groups would see different numbers of SlowUpdate transitions, for example.

Transition Deadtime

The XPM may be instructed to require a transition to obey deadtime by including bit 7 (OR 1<<7) when writing to the "MsgHeader" PV.  Ordinarily, just the TransitionId is written to this PV.

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