CA Lab Get VI (read values)

This is a polymorphic VI for reading values or fields of EPICS variables.

 INPUT:

• PV Name(s)
  • Name of EPICS variable OR string array of EPICS variable names
  • Attention if you use an array of EPICS variable names!
    Mixed target data types arise as a result of a 2-D array with size of:
    number of names multiplied by size of largest data type of the group
    
• Filter
  • optional
  • output filter  (this can save ressources and increase performance)
    Following values can be combined with OR:
    • PV indicators:
      • firstValueAsString = 1
      • firstValueAsNumber = 2
      • valueArrayAsNumber = 4
      • errorOut = 8
    • PV Info cluster:
      • pviElements = 16
      • pviValuesAsString = 32
      • pviValuesAsNumber = 64
      • pviStatusAsString = 128
      • pviStatusAsNumber = 256
      • pviSeverityAsString = 512
      • pviSeverityAsNumber = 1024
      • pviTimestampAsString = 2048
      • pviTimestampAsNumber = 4096
      • pviFieldNames = 8192
      • pviFieldValues = 16384
      • pviError = 32768
• Field Names
  • Optional
  • String array of static EPICS fields ("EGU", "DESC" etc.)
• Timeout (3)
  • Optional
  • Timeout for Channel Access requests in seconds (1-255)
  • Default value: 3 seconds
• NoMDEL (F)
  • optional
  • TRUE:
    • ignores EPICS PV field (parameter) MDEL
    • ignores monitor dead-band of Channel Access
    • all changes of values are visible (like caget)
    • disables caching of values -> higher network impact!
  • FALSE:
    • default
    • works with notifications (like camonitor)
    • significant changes of values are visible (MDEL)
    • enables caching of values -> lower network impact!
• variable PV names (T)
  • optional
  • true: in the case of changing PV names at PV name input (performance drop)
  • false: in the case of static PV names (best performance)
• Error in (no error)

OUTPUT:

• PV Names (dup)
  • Name of EPICS variable OR string array of EPICS variable names
• 1st Value (string)
  • Value of variable as String / Array of first values
  • Shows first item of value array(s) only
  • When the PREC field is queried (Field Names = [..., "PREC", ...]), the string output of the value is formatted accordingly. This enhancement applies only to EPICS records that support the PREC field.
• 1st Value (number)
  • Value of variable as Double / Array of first values
  • Shows first item of value array
• Value array (number)
  • All values of variable in double array (1D/2D)
• PV Info /PV Info array
• Status
  • FALSE: request(s) successful
  • TRUE: warnings or errors
• Error out
  • Global I/O error