@Zeplin1967 : Welcome! It is best to post a new topic when asking a new question. General Chit Chat or Projects ( viewforum.php?f=141 ) might be best. Also, try searching for “Arduino OneWire”. There are some 1-wire serial number devices which may do what you need? E.g. DS2401+.
@transistors62 : You say “after each reset, the baudrate is set back to 500kbp”. When you say “reset”, do you mean power-cycling the OpenLog Artemis, or do you mean an actual reset (option “r” from the menu)? The baud rate is saved both in memory and on the SD card. A power cycle should not change it. There must be something unusual going on if it is being reset to the default.
Best wishes,
Paul