[Dsg-hallc_gem] Two channel GEM monitoring system

[William Henry]

Hi Marc,

As of this morning, they were not available on the accelerator network.  I think it is because the computer center asked us to move all of our iocs to a virtual machine and now firewall policies need to be changed.  I was working on getting this resolved  today, see
<https://logbooks.jlab.org/entry/4333887>
logbooks.jlab.org<https://logbooks.jlab.org/entry/4333887>
[X]<https://logbooks.jlab.org/entry/4333887>

However last I checked, it is still not working when I try to use myaplot , but liveplot does work.  I haven’t tried the Wave tool yet.  I will try to get this resolved tomorrow.   If not, I can move the ioc to a cdaq computer as a temporary solution.  Sorry, I’m not a networking expert so I’m learning on the fly, (broadcast, subnets, firewalls, gateways 🤯)

Bill Henry

On Feb 27, 2025, at 4:38 PM, Marc Mcmullen <mcmullen at jlab.org> wrote:


Hi Bill,

I tested your environment change on the Pi using the command line, it at least gave access to the PVs on the IOC. I am trying to add the CA address list to the Bashrc file.

What I am not sure is that those PVs are accessible on the accelerator computers. Have you checked to see if you could access the PVs values using the Wave tool?

I had to bring the Pi back to my office to work on it. I am trying to reinstall it tomorrow sometime?

Marc

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________________________________
From: William Henry <wmhenry at jlab.org>
Sent: Thursday, February 27, 2025 1:39:10 AM
To: Marc Mcmullen <mcmullen at jlab.org>; dsg-hallc_gem at jlab.org <dsg-hallc_gem at jlab.org>
Subject: Re: Two channel GEM monitoring system

Marc,

Try setting this environmental variable, it worked for me (see below).  In a terminal do

  *
export EPICS_CA_ADDR_LIST="129.57.147.143"

then you should be able to caget the variables.  That is the IP address of the virtual machine the IOC is running on.  I added that line to my .login file.

Regards,

Bill

pi at raspberrypi:~/epics/base/bin/linux-arm $ ./caget HCGEM:gas:ch01
Channel connect timed out: 'HCGEM:gas:ch01' not found.

pi at raspberrypi:~/epics/base/bin/linux-arm $ export EPICS_CA_ADDR_LIST="129.57.147.143"

pi at raspberrypi:~/epics/base/bin/linux-arm $ ./caget HCGEM:gas:ch01
HCGEM:gas:ch01                 0

________________________________
From: Dsg-hallc_gem <dsg-hallc_gem-bounces at jlab.org> on behalf of Marc Mcmullen <mcmullen at jlab.org>
Sent: Wednesday, February 26, 2025 5:04 PM
To: dsg-hallc_gem at jlab.org <dsg-hallc_gem at jlab.org>
Subject: [Dsg-hallc_gem] FW: Two channel GEM monitoring system






From: Marc Mcmullen <mcmullen at jlab.org>
Date: Wednesday, February 26, 2025 at 2:02 PM
To: dsg-hallc_gem at jlab.org <dsg-hallc_gem at jlab.org>
Subject: Two channel GEM monitoring system

Hi Holly,



The system installation was completed earlier today.



There is some issue with the PVs on the IOC. The PVs are not available on the 168 subnet. Bill Henry is looking into this.



But I was able to confirm that the software runs on the Raspberry Pi. Once Bill gets the PVs running, he’ll let me know and I’ll start the software.



Bill also said that Hall C would connect the gas lines to the flow sensor box. If he needs guidance with that our gas system specialist George Jacob’s can be contacted through this mailing list.



The Gas lines attach a the quick connects on the GEM gas monitor box (see attached photo).



Regards,

Marc



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