Experimental Physics and
Industrial Control System

On 10/12/20 11:54 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?

In pvapy can’t you just create a Channel object for each PV, and call it’s monitor() method?

Mark

What Mark said should work.

For example
 |             def echo(x):
 |                  print 'New PV value: ', x
 |              channel = Channel('exampleFloat')
 |              channel.subscribe('echo', echo)
 |              channel.startMonitor()

Marty

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
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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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