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<== Date ==> <== Thread ==>

Subject: Re: Channel Access and channel name weirdness
From: Michael Westfall via Tech-talk <tech-talk@aps.anl.gov>
To: "Johnson, Andrew N." <anj@anl.gov>
Cc: "tech-talk@aps.anl.gov Talk" <tech-talk@aps.anl.gov>
Date: Mon, 22 Jul 2019 14:27:03 -0400
Hi Andrew,

I've filtered for packets coming from a specific IP address, so I know which IOC is sending it.

I hadn't considered the possibility that the problem is in a sequencer program. A quick check of the relevant  sequencer programs shows that these channels are referenced there as well as in the main database file. So... I will do some further investigation...

On Fri, Jul 19, 2019 at 5:38 PM Johnson, Andrew N. <anj@anl.gov> wrote:
Hi Mike,  How do you know what client is requesting those names? My guess is it may be a sequence program (or maybe a PV named in an access security file) running on the same IOC which hasn't been given the right prefix.

The 'dbcar' command lists the IOC's dbCa links, and can confirm or deny that it's a database link (use dbcar "*", 0/1/2 to see increasing amounts of info). You'll need to use the sequencer commands seqShow and seqChanShow to check for unconnected channels for your sequence programs, I forget what the arguments are to seqChanShow but I think you give it a program name and "-" to see only disconnected channels. There is also a similar 'ascar <level>' command for reporting CA connections if you're using access security.

HTH,

- Andrew

-- 
Complexity comes for free, Simplicity you have to work for.


--
Mike Westfall
Control Systems Software Engineer



References:
Channel Access and channel name weirdness Michael Westfall via Tech-talk
Re: Channel Access and channel name weirdness Johnson, Andrew N. via Tech-talk

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