Experimental Physics and
Industrial Control System

john sinclair <[email protected]> · Fri, 15 Mar 2002 10:21:37 -0500 (EST)

On Thu, 14 Mar 2002, Jon Brinkmann wrote:

> John,
> 
> I would like to modify the EDM monitors, especially "meter" and "bar", to allow
> them to optionally
> 
> 	- display maximum and/or minimum values received in either a specified
> 		number of readings/time or since EDM was started
> 	- average a specified number of readings or since EDM was started,
> 
> either using the primary indicator or as an additional indicator.
> 
> Before I embark on this project, I thought I'd check to see if said
> modifications or some subset of them already existed.  Has anyone seen them?
> 
> Thanks,
> 
> Jon

Jon,

This is a very nice suggestion. In fact, we were using VSystem (a
commercial product) prior to EPICS and edm was written to provide some of
the functionality provided by VDraw but not present in medm, dm2k & dm.
VDraw implemented this behavior for the meter widget and I have
already received a request to do the same by several members of the staff
here.

Another thing these widgets need is an indication of alarm range.

Anything you do along these lines will be appreciated.

Be aware that the edm widget developers documentation is a bit out of
date. If you decide to proceed, I will be happy to provide any assistance
and will take this opportunity to begin updating the documentation.

Also note that the edm architecture supports a "plug-in" mechanism for
widgets. This means you may copy the existing widgets and create entirely
new widgets in a separate library. Thus you may distribute these new
widgets for others to test without compromising the stability of their
current configuration (if there's a problem, they simple remove the
plug-in and restart edm). When you are satisfied with the performance and
stability, we can then replace the existing widgets with your enhanced ones.

John Sinclair
[email protected]
Oak Ridge National Lab
865-576-6362   865-574-1268 (fax)

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System