Experimental Physics and
Industrial Control System

On 10/12/20 8:54 PM, Mark Rivers via Tech-talk wrote:
> 
> However, in the process of testing it, it was found that only a single PV can be monitored
> 
> In p4p can’t you just call the monitor() method multiple times, once for each PV that you want to monitor?

As Mark says, it should be as simple as calling monitor() again.

I wonder though about the mention of 'multiChannel'.  While most PVA servers which support the
GET network operation on a given PV also support MONITOR, this is not required (though imo. it
should be).  So it is entirely possible for a custom PVA server not to implement the MONITOR
operation.  There is nothing a client can do about this.

Which PVA server is involved here?


> In pvapy can’t you just create a Channel object for each PV, and call it’s monitor() method?
> 
> Mark
> 
> 
> Sent from my iPhone
> 
> On Oct 12, 2020, at 10:18 PM, 秦天 via Tech-talk <tech-talk at [email protected] <tech-talk at [email protected]> wrote:
> 
> Subject: How can I use pvapy or p4p to monitor multiple PVS
> From:Sky Qin<qt980319 at mail.ustc.edu.cn>
> To:tech-talk at aps.anl.gov
> Date:Tue,13 October 2020
> 
> Hi EPICS community, I am trying to monitor several EPICS7 PVs using pvapy or p4p. pvapy and p4p are described below:
> 
> http://epics-pvdata.sourceforge.net/docbuild/4.7.0/pvaPy/
> 
> https://mdavidsaver.github.io/p4p/
> 
> However, in the process of testing it, it was found that only a single PV can be monitored.The method of connecting to multiple PV is multiChannel,but there is only get(),  no monitor method. What method can be used to monitor a large number of PV?
> 
> Best regards,
> Sky Qin
> 下载视频
> 

References:

How can I use pvapy or p4p to monitor multiple PVS 秦天 via Tech-talk <tech-talk at aps.anl.go

Re: How can I use pvapy or p4p to monitor multiple PVS Mark Rivers via Tech-talk

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