Used by Ming-Fu's image intensifier.

ACR
 |
 v
xpm0 (room208 bldg 901)
 |
 |----------------------------------->xpm3 (rix hutch)
 v
xpm2 (tmo hutch, supervisor xpm for tmo, generates group triggers and sequences of eventcodes)
 |
 |--------------------> detectors (piranha, hsd)
 v
xpm4 (tmo hutch, 1.6us delay going through each xpm stage)
 |
 |--------------------> detectors (hsd (4 hsd channels))
 |
 |
 v-----> controls timing fanout (like a simpler xpm)
           |
	   v
           --------> TPR and other hutch controls devices
                      |
                      |----> multiple TTL (12?)

L0GroupTrigger means xpm2 sending out group0 trigger

time---->
 begin(from acr)                                                                        Beam
-100us       L0GroupTrigger: ~-25us(Group0:L0Delay+fiberdelays)                         0us
                                   FZPPiranha: -16us (84-75=9us, done by daq software)
             IntensifierTrg: ~-25us+94us (feels late? should be more like 9us)

previous number that worked was 14us, which feels more correct than current 94us with TPR TREF=0
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