Experimental Physics and
Industrial Control System

[email protected] (Tim Mooney) · Mon, 14 Dec 1998 18:47:02 -0600

re...

> 	I am using a special record developed at JLab to control LeCroy
> 1458 High Voltage mainframes and associated modules.  This record and its
> associated support works very well.  However, the record definition doesn't
> include a .PREC field.  This seems to produce the result, when I display
> the voltages and currents in a medm gui in "decimal" format, that I only
> see integer values.  Unfortunately, the first (and sometimes second)
> decimal place in the voltage and/or current contains information that I
> would like to see.  If I just add a .PREC field to this record and give it
> a value of 1 or 2, will medm "do the right thing" ?  Please note:  This
> special record does not make use of the .VAL field.  Instead, the values of
> interest are stored in other fields (essentially .VOLTAGE and .CURRENT)
> which I display in the medm gui.  So I am really asking if the .PREC field
> will influence the display of these other fields in the record.

Just adding a PREC field won't do anything at all because medm doesn't actually
look at that field.  Display precision is determined by what the record-support
function get_precision() says when it's called and asked (separately) about each
field medm wants to display.  PREC is just a convenient, standard way for the
database developer or user to give get_precision() a default answer.

Tim Mooney

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System