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Subject: Re: Proposed change in asyn - request for comments
From: Andrew Johnson <anj@aps.anl.gov>
To: tech-talk@aps.anl.gov
Date: Fri, 1 Jun 2012 09:55:48 -0500
Hi Bruce,

On 2012-05-31 Bruce Hill wrote:
> 
> My concern was that overloading the TSE field to contain EVR Event codes
> would be inappropriate for a module like asyn that is used by many sites
> that don't use EVR's.

The TSE and TSEL fields were originally /designed/ for use with timing system 
event codes.  The Record Reference Manual describes the TSE field thus:

    This indicates the mechanism to use to get the time stamp. '0' - call
    get time as before '-1' - call the time stamp driver and use the best
    source available. '-2' - the device support provides the time stamp
    from the hardware. Values between 1-255 request the time of the last
    occurrence of a generalTime event.

  https://wiki-ext.aps.anl.gov/epics/index.php/RRM_3-14_dbCommon

I agree that this mechanism is not currently much use on systems that don't 
use an event timing system, although it would be quite feasible to write a 
plugin for the generalTime event subsystem that provides global event times 
from UDP packets.

- Andrew
-- 
Never interrupt your enemy when he is making a mistake.
-- Napoleon Bonaparte

Replies:
Re: Proposed change in asyn - request for comments Williams Jr., Ernest L.
Re: Proposed change in asyn - request for comments Bruce Hill
References:
Proposed change in asyn - request for comments Mark Rivers
RE: Proposed change in asyn - request for comments Kim, Kukhee
Re: Proposed change in asyn - request for comments Bruce Hill

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