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