G0 Cryogenic Target Control Epics Database
		March 2001


In EPICS, devices are monitored and controlled by database records.
Each record consists of many fields that individually can be monitored
or changed.  
Most used fields in database records:
<name>.VAL                  value of record (default)
<name>.PREC                 display precision (integer 0-10)
<name>.NAME                 record Name (ascii)
<name>.HOPR                 display upper limit
<name>.LOPR                 display lower limit
<name>.SMOO                 Smoothing Factor 
                            {val = newval*(1-smoo) + oldval*smoo}
<name>.SIMM                 Simulation mode
<name>.SVAL                 Simulation mode value
<name>.DESC                 Description of  record or record type
<name>.CALC                 algorithm used in a calculation
<name>.INAM                 Initializing subroutine used by a subroutine record
<name>.SNAM                 subroutine used by a subroutine record

  Analog Input record that are connected to hardware will depend on the
address mapping to convert the analog signal to digital counts (ie. 5v = 65535).
<name>.DTYP                 Device Driver Name (ie IP_ADC )
<name>.INP                  Hardware address designation
                              #Cc Ss @as,ch,pol,inp,vol
                              where c = carrier (0-2)
                                    s = slot #  (0-3)
                                   as = slot char. (A-D)
                                   ch = chan # (1-8)
                                  pol = polariy (0 = unipolar, 1= bipolar)
                                  inp = input (0=differential,1="+",2="-")
                                  vol = max volt
<name>.LINR                 Conversion Type (NO CONVERSION,LINEAR)
<name>.EGUF                 Engineering Units Full
<name>.EGUL                 Engineering Units Low
<name>.ESLO                 Slope for Linear Conversion 
                                 eslo = (eguf - egul)/8192;  /* calculated only once */
                                  val = (rval + roff)* eslo + egul

  Subroutine and Calculation records have additional value fields, that
can be used as input values for the calc record and either input/output
or intermediate values in subroutine records.
<name>.A - <name>.L         

  Alarms are generated in the following manner....
   high alarm=hsv  && (val >= high||((lalm==high)&&(val >= high-hyst)))
   hihi alarm=hhsv && (val >= hihi||((lalm==hihi)&&(val >= hihi-hyst)))
   low  alarm=lsv  && (val <= low ||((lalm==low )&&(val <= low +hyst)))
   lolo alarm=llsv && (val <= lolo||((lalm==lolo)&&(val <= lolo+hyst)))
      lalm is the alarm status during the last processing cycle.
<name>.HIHI                 High-High Alarm limit
<name>.HIGH                 High Alarm limit
<name>.LOLO                 Low Low Alarm limit
<name>.LOW                  Low Alarm limit
    The severity can be (NO_ALARM, MAJOR, MINOR, INVALID) where NO_ALARM
    is displayed as GREEN, MAJOR as RED, MINOR as YELLOW and INVALID as
    WHITE.
<name>.HHSV                 High-High Alarm severity 
<name>.HSV                  High Alarm severity 
<name>.LLSV                 Low Low Alarm severity 
<name>.LSV                  Low Alarm severity 

 Digital Valve Control 
<name>O.VAL                 Valve Open switch
<name>C.VAL                 Valve Close switch
<name>.VAL                  Valve position (-1 open,.5 close,-.5 midway,0 power failure)