That's a long pause -- even a reset should only be ~500 usec.
In fact you've given a great hint to the solution. There must be a
discharge-all-lines command being sent.
Indeed, trying to intermix commands on the DS2409 causes a dischargew-all
that resets the temperature conversion. I'll fix.
Thanks for the bug report -- you found an untested scenario.
Paul Alfille
On Dec 7, 2007 3:58 AM, DaEr <[EMAIL PROTECTED]> wrote:
>
>
>
> Paul Alfille-2 wrote:
> >
> > Note, there was a fix for DS2409 Hubs after the latest relesase (2.7p0)
> in
> > the CVS. 2.7p1 should be released soon incorporating this fix and fixed
> > thermocouple calculations and fixed serial port setup.
> >
> > Paul Alfille
> >
>
> I also have some problems with reading DS18s20, parasitic powered
> connected
> to a DS2409 hub using a USB adapter. I have checked it out and build it.
> I'm
> still dosn't get it to work correctly.
>
> I have been trying to understand what happens and if I look on the bus
> with
> a oscilioscope I can see that the bus is held low for quite a while ,
> about
> 7-13ms, when OWFS trying to read the temperature after the convert
> command.
> If the low time is in the lower range the temp. is read correctly, if
> longer
> I get 85.
> I don't know if is same in the cvs version as I did this observations in
> the
> v2.7p0 release.
>
> Dag Erlandsson
> --
> View this message in context:
> http://www.nabble.com/Re%3A-Problem-with-temperature-reading-tf4957646.html#a14208997
> Sent from the OWFS - Dev mailing list archive at Nabble.com.
>
>
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