try with a active device
2008/9/12 Paul Alfille <[EMAIL PROTECTED]>
> 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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