Hello all. I have recently been delivered two of the newest versions of the Hydros 21 CTD sensors. They are replacing two that were destroyed after a year in the field. Anyway, with these new sensors, I am having issues with the SDI12 address. I have run the SDI12 check code (posted earlier) and have used that to try and program the sensor so that the SDI12 address is 1 and not 0. That works great. However, each time I restart the Mayfly or try and upload the logging sketch, the sensors revert back to address 0. As such they fail to transmit the data and I get -9999 results. Thoughts?