Try to use the alarm-directory.
# Setup
foreach 12.*
openeach
writevalue_to_set_alarm
closeeach
end foreach
# Main loop
foreach uncached/alarm
openeach
readvalue
reset_alarm
closeeach
end loop
--
Serg.
> Greetings to all,
>
> I am implementing a system which need to poll sensors (mainly DS2406 and
> DS2408) nearly every second. Of course I use uncached values of sensors to
> get the most recent data. I have about 15-20 sensors to poll.
>
> I see three options:
>
> First:
> loop:
> openfile("12.XXXXXXXX/latch.A");
> readvalue;
> closefile;
> end loop.
>
> The most obvious one, but open/close file is rather costly operation.
>
> Second:
> openfile("12.XXXXXXXX/latch.A");
> loop:
> readvalue;
> goto_first_line;
> end loop;
> closefile;
>
> This is better, but is there some chance, that value will be cached somewhere
> inside OS?
>
> Third:
> give up on owfs and use owhttpd and make tcp connections to read files.
>
> I think this is a heaviest one, but crossplatform, so can be used on windows.
> Can owhttpd have about 20 concurrent connections in a second?
>
>
> What strategy to choose? Thank you for any help in advance.
>
>
> Best Regards,
>
> Ivan, PhD
>
>
>
>
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