pvaSrv/DEMO at master · epics-rip/pvaSrv · GitHub

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First run a pvAccess server providing access to EPICS V3 channels via pvAccess protocol by
running ./runV3Channel in another terminal (or in background).

pvget, pvput and eget utilities are delivered by pvAccessCPP (caget and caput equvivalents).
They are located in pvAccessCPP/bin/$EPICS_HOST_ARCH directory.

1. Get the value of a V3 scalar PV
----------------------------------
> pvget double01
double01                       0


2. Put the value of a V3 scalar PV
----------------------------------
> pvput double01 1.23
Old : double01                       0
New : double01                       1.23


3. Get the value of a V3 array PV
----------------------------------
> pvget doubleArray01
doubleArray01 0

(returns an array with zero elements)


4. Put the value of a V3 array PV
----------------------------------
> pvput doubleArray01 3 11 22 33
Old : doubleArray01 0
New : doubleArray01 3 11 22 33


5. Get the values of all the fields of V3 record (-r is pvAccess request string)
--------------------------------------------------------------------------------
> pvget -r 'field()' double01
double01
epics:nt/NTScalar:1.0
    double value 1.23
    alarm_t alarm
        int severity 2
        int status 0
        string message LOLO
    time_t timeStamp
        long secondsPastEpoch 1353588502
        int nanoSeconds 133410000
        int userTag 0
    display_t display
        double limitLow 0
        double limitHigh 10
        string description
        string format %f
        string units Counts
    control_t control
        double limitLow -0.1
        double limitHigh 9.9
        double minStep 0
    valueAlarm_t valueAlarm
        boolean active false
        double lowAlarmLimit 2
        double lowWarningLimit 4
        double highWarningLimit 6
        double highAlarmLimit 8
        int lowAlarmSeverity 0
        int lowWarningSeverity 0
        int highWarningSeverity 0
        int highAlarmSeverity 0
        double hysteresis 0


6. Get the values of some fields of V3 record (-r is pvAccess request string)
--------------------------------------------------------------------------------
> pvget -r 'field(value,timeStamp,alarm)' double01
double01
epics:nt/NTScalar:1.0
    double value 1.23
    alarm_t alarm
        int severity 2
        int status 0
        string message LOLO
    time_t timeStamp
        long secondsPastEpoch 1353588502
        int nanoSeconds 133410000
        int userTag 0


6. Monitor the value of a V3 scalar PV
--------------------------------------
> pvget -m counter01
counter01                      4
counter01                      5
counter01                      6
^C


7. Scalar unsigned support (accessing V3 scalar PV as unsigned)
--------------------------------------------------------------

> pvput ubyte01 255
Old : ubyte01                        0
New : ubyte01                        255

> pvget ubyte01
ubyte01                        255