An 85 is returned if the temperature conversion had a problem or is not finished yet. The problem is how can you tell when it is a good reading of 85.
Eric Darryl wrote: > On 12/5/06, Mark Richards <[EMAIL PROTECTED]> wrote: >> Dallas had an issue with 18B20, 18S20, 18B20-PAR, and 18S20-PAR devices, >> known famously as the "C3" Die problem, some time ago. It is >> characterized, as I am told, by repeated 85C readings returned from the >> device caused by a failure of the chip to properly POR. The fix >> involves issuing an "exit from test mode" command prior to a conversion. >> >> Reset >> issue ROM Command (Skip, Match) >> issue 0x64 >> >> I haven't seen this problem in new stock so perhaps the best fix is to >> replace the device in question. However I do cover this in my software >> and perhaps 1WFS might, too. >> >> /m >> >> Paul Alfille wrote: >>> 85 (the AA00 bit pattern) is apparently one of the error modes of the >>> chip. We repeat the measurement if it occurs. Then return the value (it >>> COULD be correct). I don't know how to improve. Perhaps power issues? >>> Purely a guess. >>> >>> Paul >>> >> > > > Not sure what's going on behind the scenes BUT the error only occurs > when I have two separate scripts trying to read the devices BOTH > through owserver. > > -darryl ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
