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Subject: MCA7-7: Problems to read PV mca
From: Douglas Henrique C. de Araújo <douglas.araujo@lnls.br>
To: tech-talk@aps.anl.gov
Date: Tue, 8 May 2018 16:27:26 -0300
Hi,

I installed the support mca7-7 to use a X-123SDD Detector using the MCA Amptek Driver. The IOC starts correctly and the medm screen Amptek.adl works perfectly, but I'm having problem to read a PV mca1.

In the medm screen mca.adl the graph don't show any data and return the follow message: The requested data transfer is greater than available memory or EPICS_CA_MAX_ARRAY_BYTES. If I use "caget" in this PV, I have the same problem.

But, if I limit the number of elements of array until 4095 using: caget -# 4095 mcaTest:mca1 for example, the pv return a correct value. I put a very high value in variable EPICS_CA_MAX_ARRAY_BYTES="999999999999", but it still didn't work.

Has anyone had this kind of problem? Any idea how to debug/solve this?

Best Regards

--
Douglas Henrique C. de Araujo
Software de Operação das Linhas de Luz
Laboratório Nacional de Luz Síncrotron – (LNLS)
Centro Nacional de Pesquisa em Energia e Materiais (CNPEM)
douglas.araujo@lnls.br | +55 (19) 3512 1228
www.lnls.br


Replies:
Re: MCA7-7: Problems to read PV mca Hugo Slepicka

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