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Subject: Re: Last chance to save the sequencer's pv layer ?
From: Ben Franksen <ben.franksen@online.de>
To: tech-talk@aps.anl.gov
Date: Mon, 30 Jan 2012 02:05:34 +0100
Am Freitag, 27. Januar 2012, 22:46:42 schrieb Matthieu Bec:
> I am looking for a framework to develop state machines, à la SEQ/SNL but
> ... not targeted to epics or channel access.

Which system are you interested in, instead of EPICS/CA?

> The PV API - still present in seq-2.1.4? - seems to go in the right
> direction, but I recall a discussion in 2010 stating it might eventually
> go away.

Does your system fit the PV API framework? It should at least support 
subscriptions, i.e. notification messages when a value changes. How are a 
variable's alarm status and severity encoded and is this compatible to the way 
the PV API defines them?

I may be persuaded to keep the PV layer if it turns out it is of any practical 
use. I just don't like to maintain code that nobody uses and thus merely adds 
overhead (runtime and maintenance costs). BTW, the sequencer uses only a 
subset of the existing API, which I can identify to you, if you are 
interested. In any case it would make sense to reduce the API to what the 
sequencer actually needs.

Cheers
Ben


References:
Last chance to save the sequencer's pv layer ? Matthieu Bec

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