Am 29.04.2015 um 02:04 schrieb Paul W Panish:
> I’m providing power and
> ground through the CAT5e cabling.
>
I assume you use one wire for +5V, one wire for 1W and six wires for
GND? That would be correct.
>
> The errors are not just on access to the temperature sensors (which are
> hot), but also on access to the DS2408 devices (which remain at room
> temperature), though much less frequently.
>
If you don't scan the bus, all chips but the addressed one are remaining
in pure listen mode, so they could interfere with others only by
shorting the bus at random times. That's not very likely unless you are
near 125°C chip temperature.
I'd say, check cabling and connectors, they may move mechanically when
heated.
> I’ve implemented a redundant read mechanism (in addition to any
> redundancy owfs implements), which has made the system usable, but over
> the long term this is a risky solution. I can tolerate the read errors
> assuming I get an occasional success, however if a write to a PIO output
> is dropped the results could be messy.
>
The obvious solution is to read the PIO after writing and retry if
writing has failed.
I personally use Pascal's BAE0911 instead of DS2408 and have put a
simple AE watchdog program on it so it going into a safe default
automatically after some seconds without communication.
Kind regards
Jan
------------------------------------------------------------------------------
One dashboard for servers and applications across Physical-Virtual-Cloud
Widest out-of-the-box monitoring support with 50+ applications
Performance metrics, stats and reports that give you Actionable Insights
Deep dive visibility with transaction tracing using APM Insight.
http://ad.doubleclick.net/ddm/clk/290420510;117567292;y
_______________________________________________
Owfs-developers mailing list
Owfs-developers@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/owfs-developers
