Disable output record using asynInt32 interface automatic read from the hardware

[Yann Mandza via Tech-talk <tech-talk at aps.anl.gov>]

Hi all,

I have an asyn port driver using the asynInt32 and asynFloat64 interfaces for different output record types. Am using the asynDrvUser to create the driver parameters.

I noticed that for asynFloat64 interface, there is no auto call to the ‘readFloat64’ method when DB load at ioc boot which is the behaviour am expecting. However, for asynInt32 interface, Ao records tend to make a call to the ‘readInt32’ method somehow automatically. I tried longout and bo on that interface and there are no initial calls to ‘readInt32’.  Tried to follow this thread. https://epics.anl.gov/tech-talk/2019/msg01402.php, but am still puzzled on how to control this feature on AO records.

 

My DB looks somehow like this, am my driver has these asynflags: ASYN_CANBLOCK | ASYN_MULTIDEVICE

 

record( ao, "$(P)$(R):DelayedTripAction-O") {

      field(DTYP,"asynInt32")

      field(OUT,"@asyn($(PORT))INT_PARAM1($(ADDR))")

}

 

record(mbbo,"$(P)$(R):R2") {

       field(DTYP,"asynInt32")

        field(OUT,"@asyn($(PORT)) INT_PARAM2($(ADDR))")

}

 

Best Regards

 

Yann