The state record is a means for a state program to communicate with the operator interface. Its only function is to provide a place in the database through which the state program can inform the operator interface of its state by storing an arbitrary ASCII string in its VAL field.
Note this record is deprecated and may be removed in a future EPICS release.
The record-specific fields are described below, grouped by functionality.
The state record has the standard fields for specifying under what circumstances it will be processed. These fields are listed in "Scan Fields". In addition, "Scanning Specification" explains how these fields are used.
See "Fields Common to All Record Types" for more on the record name (NAME) and description (DESC) fields.
Field Summary Type DCT Default Read Write CA PP NAME Record Name STRING [61] No Yes No No DESC Descriptor STRING [41] Yes Yes Yes No
The state record has the alarm parameters common to all record types. "Alarm Fields" lists other fields related to a alarms that are common to all record types.
These parameters are used by the application code to convey the state of the program to the operator interface. The VAL field holds the string retrieved from the state program. The OVAL is used to implement monitors for the VAL field. When the string in OVAL differs from the one in VAL, monitors are triggered. They represent the current state of the sequence program.
Field Summary Type DCT Default Read Write CA PP VAL Value STRING [20] Yes Yes Yes Yes OVAL Prev Value STRING [20] No Yes No No
long (*process)(struct dbCommon *precord)process() triggers monitors on VAL when it changes and scans the forward link if necessary.