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Entry  29 Jan 2020, Pintaudi Giorgio, Info, Force triggering of idle routine of a frontend 
    Reply  02 Feb 2020, Konstantin Olchanski, Info, Force triggering of idle routine of a frontend 
       Reply  02 Feb 2020, Pintaudi Giorgio, Info, Force triggering of idle routine of a frontend 
    Reply  03 Feb 2020, Stefan Ritt, Info, Force triggering of idle routine of a frontend 
       Reply  04 Feb 2020, Pintaudi Giorgio, Info, Force triggering of idle routine of a frontend 
          Reply  07 Feb 2020, Stefan Ritt, Info, Force triggering of idle routine of a frontend 
             Reply  07 Feb 2020, Pintaudi Giorgio, Info, Force triggering of idle routine of a frontend 
                Reply  09 Feb 2020, Stefan Ritt, Info, Force triggering of idle routine of a frontend 
                   Reply  10 Feb 2020, Konstantin Olchanski, Info, Force triggering of idle routine of a frontend 
                Reply  12 Feb 2020, Stefan Ritt, Info, Force triggering of idle routine of a frontend 
Message ID: 1811     Entry time: 07 Feb 2020     In reply to: 1808     Reply to this: 1812
Author: Stefan Ritt 
Topic: Info 
Subject: Force triggering of idle routine of a frontend 
Dear Giorgio,

ok, now I'm slowly getting your point.

Dynamically changing the slow control readout rate is possible with your modification, but I consider this badd practice.

You mentioned the case of your HV over a quirky serial line. I had the same some years ago. Rather than reducing the readout rate to reduce the number of errors, I modified my device driver. If the connection is broken, the driver tries silently to reconnect. Only if the reconnect fails for more than a given period (like 1 min), then an error is produced. Otherwise the driver reads as fast as possible. Imagine you have some instabilities in your HV, which only last for a few seconds. If you read only once per minute, you might miss that. We worked hard to make the slow control system multi-threaded, so a slow many-times-retrying-to-reconnect driver does not slow any other equipment. On the other hand, if the re-connect fails for a minute, then you know that your HV unit really has a problem the shifter should follow up.

Best,
Stefan
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