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!
! SDDL Name:	ENG_TELEM_USE.SDDL
!
! Purpose:      This SDDL file defines the ENG_TELEM_USE relation.
!
! Modification History:
!
!   Date       OPR      Who                       Reason
! --------   -------    ----   ------------------------------------------------
! 11/14/00    44862     Baum   Original implementation
!
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!
!
 
LANGUAGE	SQL

RECORD  ENG_TELEM_USE_TYPE
 
!------------------------------------------------------------------------------
!
!   RECORD INFORMATION
!
!------------------------------------------------------------------------------
 
 
DESCRIPTION       "This relation is used to identify the telemetry used to
                   generate various products, and to indicate
                   trigger codes to be used when a changed value has been 
                   detected. A trigger code of zero indicates that the latest
                   value must be saved but no immediate processing is required.
                   If there is no entry in this table for a particular class
                   then that telemetry item should be ignored. The names of the
                   telemetry items is found in the eng_telem_name table. The 
                   names of the trigger codes are found in the eng_trigger
                   table. "

!------------------------------------------------------------------------------
!
!   FIELD INFORMATION
!
!------------------------------------------------------------------------------

    FIELD  product_type
        TYPE            C3
        DESCRIPTION     "FGS for jitter, AST for astrometry,  GSA for GS
                         acqusition data, or OTM for STIS temperatures."

    END_FIELD

    FIELD eng_number
        TYPE            I4
        DESCRIPTION     "A small positive value used only in FGS or AST 
                         engineering telemetry files. "
    END_FIELD

    FIELD eng_trigger 
        TYPE            I4
        DESCRIPTION     "A numeric code indicating the processing to be
                         performed when a change in telemetry value has been
                         detected. A zero value is not a trigger but that entry
                         is used to indicated that the telemetry value should
                         be saved. "
    END_FIELD

END_RECORD                             
 
 
!------------------------------------------------------------------------------
!
!   RELATION DECLARATION
!
!------------------------------------------------------------------------------
 
 
RELATION  eng_telem_use
 
    TYPE             ENG_TELEM_USE_TYPE
 
    DESCRIPTION      "Engineering Telemetry Use Relation"
 
    SUBSYSTEM_USING  "OPUS"

    INDEX  eng_telem_use_1
        TYPE         unique, clustered
        FIELDS       product_type,eng_number
    END_INDEX

END_RELATION