Experimental Physics and
Industrial Control System

Steven Hartman wrote:
> 
> On Fri, 8 Jun 2001, J. Frederick Bartlett ([email protected]) wrote:
> > dbProcess. The question is: what do I put in the DTYP and INPUT fields
> > of the record when I define it in a .db file?
> 
> If I understand correctly . . .
> 
> record(ai,"foo") {
>         field(DTYP,"Soft Channel")
>         field(INP,"")
> }
> 
> where INP is a constant with no initial value.
> 
> --
> Steve Hartman
> [email protected]
> Duke Free Electron Laser Laboratory


This is a better answer than the one I gave. There is a difference between

    field(INP,"")

and

    field(INP,"0")

devAiSoft has the statements

static long init_record(pai)
    struct aiRecord     *pai;
{

    /* ai.inp must be a CONSTANT or a PV_LINK or a DB_LINK or a CA_LINK*/
    switch (pai->inp.type) {
    case (CONSTANT) :
        if(recGblInitConstantLink(&pai->inp,DBF_DOUBLE,&pai->val))
            pai->udf = FALSE;
        break;
Thus for field(INP,"") udf will not be set FALSE but for field(INP,"0") it will
be set false.

Marty Kraimer

References:

Re: Input records with no device support Steven Hartman

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