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<== Date ==> <== Thread ==>

Subject: Re: enhanced seq record
From: Tim Mooney <[email protected]>
To: Benjamin Franksen <[email protected]>
Cc: [email protected], [email protected]
Date: Sat, 28 Jan 2006 20:46:35 -0600


Benjamin Franksen wrote:

[warning, slightly longer post]

Hello Everyone,

I am in the process of writing an enhanced version of the seq record[1] (named 'sequence' record to distiguish it from the old one). Current status is "working prototype". I send this message in order to find out if there are others who would like to use it and to give anyone opportunity to request additional features or propose changes. Hopefully, this record will eventually move to base (and retire the current seq record).

What prompted me to start this was repeated frustration about seq record being limited to numbers, i.e. its inability to read or write strings. Thus, it is impossible to use a seq record to e.g. change link fields in other records. Available solutions to the problem (such as using a sequence program, or a genSub record, or an external caput-script, or whatnot) are either complicated, unsafe, too heavy-weight or simply awkward. <aside>Similar problems exist with other standard record types, e.g. sel, calc, etc.</aside>

You can use a string-calcout record (sCalcout) for this purpose. See http://www.aps.anl.gov/aod/bcda/synApps/calc/R2-4/sCalcoutRecord.html Some of the string expressions are intended mostly for use on links, e.g., the expression "xxx:myMotor.DESC"{".DESC",".VAL"} yields "xxx:myMotor.VAL"

--
Tim Mooney ([email protected]) (630)252-5417
Beamline Controls & Data Acquisition Group
Advanced Photon Source, Argonne National Lab.

References:
enhanced seq record Benjamin Franksen

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