Passive mode is the serial port based adapter than uses only diodes and
resistors rather than a special chip like the DS2480B.
On 9/12/08, Mike Dunn (owfs-devel) <[EMAIL PROTECTED]> wrote:
>
> I've actually tried to isolate the DS2409/DS1820 on a short, single
> network branch, so it does not appear to be a network or hardware
> problem. Additionally, I have tried other 1-wire adapters and different
> DS1820s to make sure the error is repeatable.
>
> Can anyone explain what "passive mode" is? I've found some references
> to the fact that 1-wire devices cannot be parasitically powered, while
> in passive mode. Is this relevant to the 1-wire bus master, or
> something in owfs?
>
> Thanks
> Mike
>
>
> Roberto Spadim wrote:
> > maybe a hardware error cause a reset on ds18s20
> > try it near ds9097
> >
> > 2008/9/8 Mike Dunn (owfs-devel) <[EMAIL PROTECTED]
> > <mailto:[EMAIL PROTECTED]>>
> >
> > Hi,
> >
> > I was hoping that someone could help me with a problem I've
> > encountered with my DS18S20's. I am getting the dreaded 85C error
> > when I parasitically power a the DS18S20 on either the main or aux
> > branch of my DS2409 based hub. If I provide +5 to the temp
> > sensor, or move the sensor (in parasite mode) to the main branch,
> > the sensor works normally. The sensor also works behind the
> > DS2409 in parasite mode, if I probe the sensor using Digitemp.
> >
> > In researching the problem, I've tested with 2.7p2, 2.7p4, and
> > yesterday's CSV. I've also tested the patch Paul provided in last
> > week's thread regarding an 85C problem, but it appears to have had
> > no effect. The problem also reproducable using a DS9490 USB
> > adapter, a DS9097 serial adapter, and on a small, isolated 1-wire
> > network.
> >
> > Any help would be greatly appreciated! I've captured a log
> > (error_level=9) during which I owdir the device, owread unpowered
> > (producing the 85C error) and then owread again with power. The
> > log was captured using owfs 2.7p6 (yesterday's CSV with the 85C
> > patch) on a Debian Etch host.
> >
> > Thanks!
> > Mike Dunn
> >
> >
> > trillian:/usr/bin# owdir -s 4304 /1F.16E903000000/aux
> > /1F.16E903000000/aux/10.9B317F010800
> > trillian:/usr/bin# owdir -s 4304 /1F.16E903000000/aux/10.9B317F010800
> > /1F.16E903000000/aux/10.9B317F010800/address
> > /1F.16E903000000/aux/10.9B317F010800/crc8
> > /1F.16E903000000/aux/10.9B317F010800/die
> > /1F.16E903000000/aux/10.9B317F010800/family
> > /1F.16E903000000/aux/10.9B317F010800/id
> > /1F.16E903000000/aux/10.9B317F010800/locator
> > /1F.16E903000000/aux/10.9B317F010800/power
> > /1F.16E903000000/aux/10.9B317F010800/present
> > /1F.16E903000000/aux/10.9B317F010800/r_address
> > /1F.16E903000000/aux/10.9B317F010800/r_id
> > /1F.16E903000000/aux/10.9B317F010800/r_locator
> > /1F.16E903000000/aux/10.9B317F010800/temperature
> > /1F.16E903000000/aux/10.9B317F010800/temphigh
> > /1F.16E903000000/aux/10.9B317F010800/templow
> > /1F.16E903000000/aux/10.9B317F010800/trim
> > /1F.16E903000000/aux/10.9B317F010800/trimblanket
> > /1F.16E903000000/aux/10.9B317F010800/trimvalid
> > /1F.16E903000000/aux/10.9B317F010800/type
> > trillian:/usr/bin# owread -s 4304
> > /1F.16E903000000/aux/10.9B317F010800/temperature
> > 85trillian:/usr/bin#
> > trillian:/usr/bin# owread -s 4304
> > /1F.16E903000000/aux/10.9B317F010800/temperature
> > 26.5trillian:/usr/bin#
> >
>
>
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