Experimental Physics and
Industrial Control System

Hi Christophe,

If you are talking about the code such as "prec->rval = (epicsInt32)(value + 0.5) - prec->roff" in the ao record, I don't think this should be changed because this is the appropriate way how ao / ai performs the conversion in the routine convert() called by record support process routine process().

For the conversion of ao, the data flow (conversion direction) is VAL (double type) --> RVAL (integer); input is double, output is integer;

For the conversion of ai, the data flow (conversion direction) is RVAL (integer) --> VAL (double); input is integer, output is double;

HTH,

Yong

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of haquin
Sent: Thursday, February 21, 2013 8:12 AM
To: tech-talk
Subject: Rounding in conversion of ao record

Hi people,

There is a rounding operation (cast to (epicsInt32)) when using the conversion of the ao record, hence, with this conversion only integer is output, no float ...
This is surprising and not equivalent to what is done for the ai record.

Could this be changed ?

Regards,
Christophe

Replies:

Re: Rounding in conversion of ao record Kasemir, Kay

References:

Rounding in conversion of ao record haquin

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