Hi:
There is no central PV service.
Out of the box, nothing in EPICS gives you a list of all PVs.
It's a feature, kind of like the internet:
http://www.google.com -> You see the web page
http://www.goxxle.com -> Can't find server www.goxxle.com
caget correct_pv_name -> You see the value
caget wrong_pv_name -> Timeout
The feature is that you do not depend on a central name server.
Nothing to set up, nothing to break.
Besides: PV names are unbounded.
Every field of every record can be a possible PV name, so the list of all
possible
names would be huge. What you want is probably a list of record names.
Eventually, most sites that use EPICS develop their own way of getting a
list of all PVs.
Or: records.
Examples:
At the end of startup, IOCs run dbl > file as Eric shows,
then something parses those files into a central database.
JLab has presented a name server based on a modified channel access gateway
that 'remembers' names and the IOCs that provide them.
IRMIS uses crawler scripts to parse IOC startup files for EPICS records
and their fields.
-Kay
From: Eric Norum <[email protected]>
The 'dbl' command will print a list of record names.EPICS st.cmd startup
scripts often create a file of record names with a command something like:
dbl >"/iocinfo/pvnames/$(IOC)"
after the "iocInit" command.
On Apr 3, 2012, at 10:16 PM, manta santosh aditya santosh_aditya wrote:
How do I come to know what process variables are there in the EPICS ?
Please guide me.
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- Re: Doubt regarding Process Variable Eric Norum
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