So... you mean a MAX31**8**50K? -_-
The latest OneWire library is here, and that page points to a good Dallas Temperature library here. Look in the examples subdirectory, also accessible from the IDE File/Examples menu.
How can I get now all Temperatures without using adress. only use unique ROM?
The Address pins don't affect the ROM selection process. The Address pin states are accessible in the CONFIG register, which is byte 4 of the scratchpad memory.
To read the temperature from a specific device, see the "Multiple" example:
float tempC = sensors.getTempC( deviceAddress );
deviceAddress is the ROM serial number (an address), not the 4 Address pins on the MAX31850K.
Cheers,
/dev