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| <== Date ==> | <== Thread ==> |
|---|
| Subject: | Re: 回复: Re: question about pcaspy |
| From: | Wang Xiaoqiang <[email protected]> |
| To: | Silver <[email protected]>, tech-talk <[email protected]> |
| Date: | Mon, 29 Aug 2016 15:35:41 +0200 |
Hi, Yes. The scan value can be arbitrary, and each PV has its own scan thread.If you have many PVs to poll, you can instead poll them sequentially in a thread.
def __init__(self):
Driver.__init__(self)
tid = threading.Thread(target=self.poll)
tid.setDaemon(true)
tid.start()
def poll(self):
# get values from the device
<<get value1>
<<get value2>
<<get value3>
# set to the pv database
self.setParam("value1", value1)
self.setParam("value2", value2)
self.setParam("value3", value3)
# post the monitor event
self.updatePVs()
Then you don't need to set the scan field, and omit the read method.
Such an example is here
https://github.com/paulscherrerinstitute/pcaspy/blob/master/example/simscope.py.
It runs a simulation task and publish the results periodically.
On 08/29/2016 02:22 PM, Silver wrote:
hi, xiaoqiang:
Thanks a lot for your letter. In fact, pcaspy is very convinent and
helpful for me, thanks for your work.
I have another question, can scan field be set to a arbitrary value such
as 0.001? If it can work, corresponding, the server.process(0.01) will
be set instead of server.process(0.1)?
------------------------------------------------------------------------
Best wishes
Geyang 2016-08-29
*发件人：* Wang Xiaoqiang <mailto:[email protected]>
*发送时间：* 2016-08-29 15:34
*收件人：* geyang <mailto:[email protected]>; tech-talk
<mailto:[email protected]>
*主题：* Re: question about pcaspy
Hi,
According to
http://www.aps.anl.gov/epics/base/R3-14/12-docs/CAref.html#Configurin2,
you can set EPICS_CAS_SERVER_PORT
# on the server side
$ export EPICS_CAS_SERVER_PORT=5078
$ python dummy.py
# on the client side
$ export EPICS_CA_SERVER_PORT=5078
$ caget MTEST:RAND
MTEST:RAND 0.000 (SEVR:INVALID STAT:UDF)
But if the same driver is instantiated for many devices, you can create
the database with different prefixes.
if __name__ == '__main__':
...
prefix = sys.argv[1]
server.createPV(prefix, pvdb)
...
Then to run the server for each device
$ python dummy MTEST1:
$ python dummy MTEST2:
Best
Xiaoqiang
On 08/28/2016 02:45 AM, geyang wrote:
> hi,
>
> I would like to ask if SimpleServer's port can be changed to
others
> in code, such as 5066/5068? For example, I have a device driver
written
> by pcaspy, I want to implement the same driver for many same type
> devices on one machine, then I need to set them different server
ports.
> thanks a lot for your help.
>
>
> Best wishes
> Geyang 2016/8/28
>
>
>