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Since a sequence in a lower-level XPM can "overwrite" sequence eventcodes from a higher-level XPM it is important to be able to stop lower-level sequences.  Matt says one does this by setting DAQ:NEH:XPM:2:SEQENG:3:ENABLE (for example) to 0.  The current example where we have to careful of this is for XPM0 which the laser group uses for eventcodes 272,273,274.  

Matt has added a Groups/EventCodes tab to the xpmpva tool.  It shows you the effect of overwriting and which xpm is the current source of eventcodes.

currently the XPM starts sequences on 1Hz boundary (e.g. every 910000 buckets). this slows down the daq scan steps, so support for a second mode is being considered:

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