Argonne National Laboratory

Experimental Physics and
Industrial Control System

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<== Date ==> <== Thread ==>

Subject: pvget to an _output_ record
From: wbrown@csg.lbl.gov (Bill Brown)
Date: Mon, 5 Dec 94 10:48:09 PST
It turns out that we have a situation where a pvget directed to
an ouptput record needs to do some processing (read the actual
device) rather than simply return the restored value.

I've looked at the IOC Application Developers Guide, as well as the
"Drivers Education" document, and it's not clear how to to this, or
even if it can be done

I see that the record structures include entries for things like:
    long            rbv;            /* Readback Value */
    long            orbv;           /* Prev Readback Value */
    etc
    
but it's not clear how these values get set and who uses them.  Or even if
they are applicable to the problem.

But I don't see anything here that would tell device support if it should be
doing a read or a write.

Any help/pointers (pun intended) would be appreciated.


Disclaimer:  Any opinions are my own and have	    |
    nothing to do with the official policy or the   |  -bill
    management of L.B.L, who probably couldn't      |   wlbrown@lbl.gov
    care less about employees who play with trains. |   Berkeley, CA

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