V4 DB RecordCommon

EPICS V4: RecordCommon September 16 2005

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Overview

For V4 dbCommon.dbd and RecordCommon.dbd replace the V3 dbCommon.dbd. dbCommon.dbd define widely used definitions and RecordCommon.dbd defines the fields that are common to all record types.

This document requires that the reader be familiar with:

1. V3 iocCore
2. V4 Design: Record Processing
3. V4 Design: dbdInterfaces

Unless the reader is familiar with these most of this document will be very difficult to understand.

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dbCommon

dbCommon.dbd defines the following:

    # menu definitions for RecordCommon fields
    menu(menuPriority) {
        choice(menuPriorityLow, "Low")
        choice(menuPriorityMedium, "Medium")
        choice(menuPriorityHigh, "High")
    }

    menu(menuScan) {
        choice(menuScanPassive, "Passive")
        choice(menuScanEvent, "Event")
        choice(menuScanInterrupt, "Interrupt")
        choice(menuScan10second, "10 second")
        choice(menuScan5second, "5 second")
        choice(menuScan2second, "2 second")
        choice(menuScan1second, "1 second")
        choice(menuScan_5second, ".5 second")
        choice(menuScan_2second, ".2 second")
        choice(menuScan_1second, ".1 second")
    }

    menu(menuAlarmSevr) {
        choice(menuAlarmSevrNone, "None")
        choice(menuAlarmSevrMinor, "Minor")
        choice(menuAlarmSevrMajor, "Major")
        choice(menuAlarmSevrInvalid, "Invalid")
    }

    menu(menuConvert) {
        choice(menuConvertRaw, "Raw")
        choice(menuConvertLinear, "Linear")
        choice(menuConvertTable, "Table")
    }

    struct(MonitorLink) {
        field(pvname,string) { link}
        field(process,bool) // process this record when monitor occurs
        field(inheritSeverity,bool) 
    }
    struct(InputLink) {
        field(pvname,string) { link}
        field(parallel,bool)
        field(process,bool)
        field(wait,bool)
        field(inheritSeverity,bool)
    }
    struct(OutputLink) {
        field(pvname,string) { link}
        field(parallel,bool)
        field(process,bool)
        field(wait,bool)
        field(inheritSeverity,bool)
    }
    struct(ProcessLink) {
        field(pvname,string) { link}
        field(parallel,bool)
        field(wait,bool)
    }

    link(in,"MonitorLink",MonitorLink);
    link(in,"InputLink",InputLink);
    link(out,"OutputLink",OutputLink);
    link(process,"ProcessLink",ProcessLink);

    #definitions for common properties
    struct(TimeStamp) {
        field(secondsPastEpoch,int64)
        field(nanoSeconds,int32)
    }

    struct Scan {
        field(scan,menu(menuScan)) {
            special(yes)
        }
        field(phase,int16)
        field(priority,menu(menuPriority)) {
            special(yes)
        }
    }

Event NEEDS NEW DEFINITIONS

    struct Event {
        field(eventNumber,int16) {
            special(yes)
        }
        field(timeStampEvent,int16)
        field(timeStampLink,link(in))
    }

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RecordCommon

RecordCommon.dbd must be part of every record, and defines the following:

    struct Disable {
        field(disableValue,int16) {
            default("1")
        }
        field(disableInput,int16)
        field(disableLink,link(in))
        field(disableAlarmSeverity,menu(menuAlarmSevr))
    }

    record(RecordCommon) {
        field(description,string)
        field(scan,struct(Scan))
        field(event,struct(Event))
        field(accessSecurityGroup,string)
        field(pini,bool)
        field(disablePutField,bool)
        field(alarmAckSeverity,menu(menuAlarmSevr)) {
            design(no)
            readonly(yes)
        }
        field(alarmAckTransient,bool) {
            readonly(yes)
            default("YES")
        }
        field(udf,bool) {
            dynamic(yes)
            default("1")
        }
        field(time,struct(timeStamp)) {
            design(no)
            dynamic(yes)
            readonly(yes)
        }
        field(disable,struct(Disable)) {
            special(yes)
        }
        field(alarmStatus,string) {
            default("UDF")
        }
        field(alarmSeverity,menu(menuAlarmSevr)) {
            readonly(yes)
            default("Invalid")
        }
        field(processLink,array([] struct(Link))) {
            special(yes)
        }
    }

Although it has many fewer fields, RecordCommon.dbd is a complete replacement for the V3 dbCommon. The following V3 fields are no longer needed:

• private fields - Private fields will truly be privaye to the implementation
• previous value fields - All puts to database fields will be posted. The layer above will decide if clients should be notified of changes.