Experimental Physics and
Industrial Control System

Jack Harper - UKRI STFC via Tech-talk <[email protected]> · Thu, 28 Feb 2019 14:43:21 +0000

I have been using pvget as well as the CPP API to attempt to set up a request for a v3 IOC that populates the timeStamp and display.units fields. For some reason, whenever i use anything from display, it stops timeStamp from being populated. I know the PVRequest is order-dependent, so I have tried moving the order of the fields around, but this doesn't help. I think this may be a bug, I am not sure if it affects V4 IOCs but i'd imagine someone would have flagged it up earlier if so.

Here is my output with a pvget request in channel access mode, you can see that the timestamp does not appear in the PV structure:

pvget SIMPLE:DOUBLE -r "value, alarm, timeStamp, display.units" -p ca

SIMPLE:DOUBLE
structure
    double value 1
    alarm_t alarm NO_ALARM NO_STATUS NO_ALARM
    structure display
        string units mm

Here is the output with the request without display (anything in display seems to prevent the timestamp being shown)

pvget SIMPLE:DOUBLE -r "value, alarm, timeStamp" -p ca

SIMPLE:DOUBLE
epics:nt/NTScalar:1.0
    double value 1
    alarm_t alarm NO_ALARM NO_STATUS NO_ALARM
    time_t timeStamp 2019-02-28T14:39:06.177 0

Any help or verification that this may or may not be a bug would be appreciated.

Thanks,
Jack

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System