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                12.1    INTRODUCTION . . . . . . . . . . . . . . . . . .  12-1
                12.2    MONITORING CRATE STATUS  . . . . . . . . . . . .  12-1
                12.3    CRATE INITIALIZATION PROCEDURE . . . . . . . . .  12-2
                12.4    CRATE VERIFICATION . . . . . . . . . . . . . . .  12-3

                                      CHAPTER 12
                         CRATE MONITORING AND INITIALIZATION

        12.1  INTRODUCTION

        The CRATE job in the micro takes  care  of  monitoring  CAMAC  crates,
        intialization   of   crates   when  necessary,  and  performing  crate
        verification upon request.

        12.2  MONITORING CRATE STATUS

        One function of the CRATE job is monitoring the status  of  the  CAMAC
        crates  associated  with  a  micro.   The  data register of each crate
        verifier is initialized with the word  TEST_DATA.   If  power  to  the
        crate  is  lost,  the  TEST_DATA  pattern  in  the  verifier  will  be
        destroyed.  The CRATE job waits at its mailbox with a  finite  TIMEOUT
        (currently  5  seconds).   If  it  has received valid mail during that
        time, it decodes the low order  function  code  and  carries  out  the
        actions  corresponding  to  that code.  If the wait at the mailbox has
        timed out, i.e.  if there is nothing else that it is requested to  do,
        then the CRATE job calls CRATE_WATCH to loop over all crates, checking
        the data register in each crate verifier to see if the data  is  still
        equal  to TEST_DATA and checking the CAMAC status return to see if the
        crate is presently on line.  If a crate is now online, but was offline



        CRATE MONITORING AND INITIALIZATION                          Page 12-2

        during  or  since  the  last  call  to  CRATE_WATCH,  then  the  crate
        initialization procedure is performed.

        12.3  CRATE INITIALIZATION PROCEDURE

        The following sequence of initialization is  done  on  each  crate  at
        start-up and whenever the CRATE job detects that a crate is now online
        but has been offline since it was last initialized:
              o  Clear ("Z") to the crate, if power has been off.
              o  Make sure inhibit is turned off.
              o  Initialize data register in crate verifier with TEST_DATA.
              o  If the crate contains a cable access receiver module  (CARM),
                 then reset it with CAMAC code F(9).
              o  If the crate contains a PDU, then do PDU initialization
              o  If the crate contains magnet DACs and SAMs, send a message to
                 MGNT job to have it do its own initialization.
              o  If crate controls klystrons, send a message to KLYS job to do
                 its own initialization.
              o  Additional initialization messages for  other  jobs  will  be
                 added as needed.
              o  



        CRATE MONITORING AND INITIALIZATION                          Page 12-3

                 Read back data in  crate  verifier  and  check  CAMAC  status
                 return  to  be  sure  that  crate  is now online and has been
                 online during the initialization procedure.   If  so,  update
                 the crate status :CRTS:  in the database to be online.

        12.4  CRATE VERIFICATION

        Upon receipt of the function code CRAT_VEREX from the VAX,  the  CRATE
        job does a verify of the requested crate and sends the results back to
        the VAX for display.