AnsweredAssumed Answered

vrf newbie advice sought...

Question asked by g.nied on Nov 14, 2004

Phil,

there is nothing wrong with your code! The only thing you should have a look at is if you really need to check (poll) the line state that often or - if not - if an On Cycle loop would do the job as well once or twice a second.

best regards,

G. Nied



Georg Nied  Software-Development  Hansestr. 7  51149 Cologne  Germany
Tel: +49 (2203) 9770915  Fax: +49 (2203) 9770924  E-Mail: info@gn-software.de


-------- Original Message --------
Subject: [vrf] newbie advice sought... (15-Nov-2004 14:28)
From:    P.J.Vossler@exeter.ac.uk
To:      vrf@agilent.com

> Please can someone advice the best way to "wait" for an external i/o event?
>
> My system  consists of an intelligent stepper motor controller that is
> controlled from Vee via a serial port. I can monitor the "DSR" line via
> a direct i/o object to tell when motion is taking place. Essentially I
> want my program to "wait" or "sleep" until movement has finished i.e.
> DSR toggles low.
>
> Currently I am using an until break object with a direct i/o and if/then
> clause to wait for a change in DSR.
>
> e.g.
>
> Until Break
>     READ IOSTATUS DSR x
>     if X==0 then
>     Break
>
> is there a more efficient method?
>
> (please accept my apologies if this has been asked a thousand times before)
>
>
> Many Thanks
>
> Phil Vossler
> School of Physics
> University of Exeter


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