Experimental Physics and
Industrial Control System

"Zelazny, Michael Stanley" <[email protected]> · Wed, 11 Sep 2013 06:55:27 -0700

I can use TSEL to get the time stamp from another record.  Example:

>cat abc.db
record(ao, "MY:PV") {
  field(TSEL, "ANOTHER:PV.TIME")
}
record(ao, "ANOTHER:PV") {
}

>caget -d 15 MY:PV ANOTHER:PV 
MY:PV
    Native data type: DBF_DOUBLE
    Request type:     DBR_TIME_SHORT
    Element count:    1
    Value:            0
    Timestamp:        <undefined>
    Status:           UDF
    Severity:         INVALID
ANOTHER:PV
    Native data type: DBF_DOUBLE
    Request type:     DBR_TIME_SHORT
    Element count:    1
    Value:            0
    Timestamp:        <undefined>
    Status:           UDF
    Severity:         INVALID

>caput ANOTHER:PV.PROC 1
Old : ANOTHER:PV.PROC                0
New : ANOTHER:PV.PROC                1

>caget -d 15 MY:PV ANOTHER:PV 
MY:PV
    Native data type: DBF_DOUBLE
    Request type:     DBR_TIME_SHORT
    Element count:    1
    Value:            0
    Timestamp:        <undefined>
    Status:           UDF
    Severity:         INVALID
ANOTHER:PV
    Native data type: DBF_DOUBLE
    Request type:     DBR_TIME_SHORT
    Element count:    1
    Value:            0
    Timestamp:        2013-09-11 06:47:57.611329
    Status:           NO_ALARM
    Severity:         NO_ALARM

>caput MY:PV.PROC 1
Old : MY:PV.PROC                     0
New : MY:PV.PROC                     1

>caget -d 15 MY:PV ANOTHER:PV 
MY:PV
    Native data type: DBF_DOUBLE
    Request type:     DBR_TIME_SHORT
    Element count:    1
    Value:            0
    Timestamp:        2013-09-11 06:47:57.611329
    Status:           NO_ALARM
    Severity:         NO_ALARM
ANOTHER:PV
    Native data type: DBF_DOUBLE
    Request type:     DBR_TIME_SHORT
    Element count:    1
    Value:            0
    Timestamp:        2013-09-11 06:47:57.611329
    Status:           NO_ALARM
    Severity:         NO_ALARM

Note that MY:PV and ANOTHER:PV have identical time stamps.

>caget MY:PV.TSEL
MY:PV.TSEL                     ANOTHER:PV.VAL NPP NMS
>

Q: Why does the output of caget list ANOTHER:PV.VAL when I set it to ANOTHER:PV.TIME?

I'm using EPICS 3-14-12 and my IOC runus on 32-bit RHEL5.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System