ASYN parameter value vs VAL field relationship

[André Favoto via Tech-talk <tech-talk at aps.anl.gov>]

Hi folks,

I am trying to control the upper limit for a given PV via asyn (same as DRVH does, but since the value is dynamic, I'd rather handle it in the driver instead of DB links).

I have the following record:

record(ao, "$(P)$(R)$(PUMP)MaxPressure") {

    field(DESC, "set max pressure for process")

    field(DTYP, "asynFloat64")

    field(EGU,  "bar")

    field(PREC, "2")

    field(OUT,  "@asyn($(PORT),$(ADDR),$(TIMEOUT))PROC_MAX_PRESSURE")

    info(asyn:READBACK, "1")

}