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psdaq/build/drp/pgpread -d /dev/datadev_0 -c 1 -r

REMEMBER:  can run DAQ and rogue GUI at the same time since rogue disables opening data stream virtual channel with this line: https://github.com/slaclab/lcls2-pgp-fw-lib/blob/d57de0f1da359b3f1ab8d899968c022f92b58a28/python/lcls2_pgp_fw_lib/hardware/shared/_Root.py#L22

See 1Hz of SlowUpdates going through (transition id 10).  The SlowUpdates cause TransactionCnt to increment at 1Hz (zero'd by toggling blowoff):

Disabled slow updates, but didn't help with 100% dead time.

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