Experimental Physics and
Industrial Control System

"D. Peter Siddons" <[email protected]> · Thu, 24 Aug 2006 09:18:17 -0400

I noticed that the ezca library does not recognize ENUM as a valid data
type. One can work around that by telling it to use a SHORT instead. If
we get the data type from the field itself, it is then necessary to wrap
the ezca call and trap ENUMs and make the switch to SHORT. I had trouble
when trying to post monitors on ENUM fields, such as the CNT field in
the scaler record. the ezcaNewMonitorValue function tries hard to
guarantee valid data is received by simply returning true if any error
occurs. The idea is that this forces the application to make a read,
whether it's needed or not. I was using this function to wait for
counting to be done before retrieving scaler contents. Given that CNT is
an ENUM, and ezcaNewMonitorValue treats this as an invalid data type, it
always returns true, defeating my logic. I resorted to posting the
monitor on the scaler contents instead, which worked fine. It would seem
that ezca should be modified to include this data type, or is there a
reason this isn't practical?

Pete.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System