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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 LATER: Matt thought about this and we can't make it work as described here: Bypass Events.

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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