DS1820 Javaproblem (Adapter)

Hallo zusammen,

ich habe nach der Schaltung von
lena.franken.de/hardware/temperaturmessung.html
einen DS18s20 angeschlossen.

Mit der Java-API von maxim habe ich ein Problem.
Beim Konvertieren der Temperatur bekomme ich einen Fehler:

Exception occurred: com.dalsemi.onewire.OneWireException: Hardware
option not available

Der Oneviewer und auch digitemp funktionieren wunderbar.

Hier mein Log:
Devel Library
=========================================
Native lib Version = RXTX-2.1-7pre16
Java lib Version   = RXTX-2.1-7pre16
Adapter ist        : {DS9097E} COM1
AdapterVersion ist : DS9097/DS9097E,DS1413,com
Speed ist          : 0
====================================================
= Found One Wire Device: CE000800ACCFB610          =
====================================================
=
= This device is a DS1920
= Also known as a  DS18S20
=
= This device has alarms
= Maximum temperature (Bereich): 100.0
= Minimum temperature (Bereich): -55.0
= High temperature alarm set to : 28.0
= Low temperature alarm set to  : 23.0
= Temperature alarm resolution  : 1.0
= Temperature resolution        : 0.5
= Resolution is selectable      : true
= Available resolution 0        : 0.5
= Available resolution 1        : 0.1
= Setting high temperature alarm to 28.0 C...
= Setting low temperature alarm to 23.0 C...
= Setting temperature resolution to 0.5...
= Could not write device state, all changes lost.
= Exception occurred: com.dalsemi.onewire.OneWireException: Hardware
option not available
= Doing temperature conversion...
= Could not complete temperature conversion...
com.dalsemi.onewire.OneWireException: Hardware option not available
Current Time = 1108023813984
Current Time = 1108023814984 (1000ms gewartet)
= High temperature alarm set to : 28.0
= Low temperature alarm set to  : 23.0
= Reported temperature: 85.0