RE: List of available pvs

[Emma Shepherd <Emma.Shepherd@synchrotron.org.au>]

Hi Tito,

 

What’s the reason for not leaving the unused channels in the database, is it because of I/O errors on the IOC console when they are not connected?  If so, I often build an ‘on/off’ function into the database so that I can easily disconnect the hardware (at least this works very well for streamDevice applications).  Instead of having lots of records on periodic scan rates polling the hardware, I put them to Passive and fwd link to them from a single fanout record.  You could then have a record in the database to represent the ‘in-use’ status, and have this change the .SCAN  field of the fanout record appropriately.

 

But not sure if this will work for your scenario!

 

Cheers,

Emma

 

 

From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of Tito Körner
Sent: Wednesday, 6 November 2013 11:18 AM
To: tech-talk@aps.anl.gov
Subject: List of available pvs

 

Hello,

I use a substitution file to create pvs representing the channels of high voltage boxes. The pattern is:

{box, level, channel}

{1, 0, 0}
{1, 0, 1}
{1, 0, 3}
{1, 1, 0}
...

As indicated not every channel of every box is in use. It would be nice to have some kind of info which channels are currently in use without simply trying every possible channel and checking whether it exists or not. It would be useful to have some kind of pv that contains this info, but currently I have no clou how I could do this. What could I do?

Regards,

Tito