Log entry time 16:15:19 on April 7,2009

Entry number 266719

As we've discussed, the HAPPEX DAQ is to be used (optionally) to
gate the L-HRS and R-HRS.  This is done with an inhibit signal
to send to the trigger supervisor (INB input).  Logical TRUE
inhibits the 2 DAQs.  Logical FALSE lets them run.  One would
start the two HRS first, then start HAPPEX DAQ.  To end, one
would end the HAPPEX DAQ first.  

The ordering explained above is the reverse of what Transversity
did.  I doubt this matters, but Joe Katich should think about it.

At any rate, I have this Inhibit (INB) signal coming out of the
2nd output of the TIR board on both ROC23 (cnt room) and ROC26
(R-HRS).  Bo Zhao will cable it up. 

If we decide to use the R-HRS we can ``turn off'' the veto remotely
using a global variable in the VME crate.  Or take access and remove
the cable.  If we use ROC23 we can simply ``turn off'' this veto
by unplugging a cable in the counting room.  This decouples the
three DAQs.