Thanks for the info. I believe this is working. I am having power issues now though too so I can’t be sure. The dc jack will not give consistent power. I may have fried something when we tried to set this up in the field using the gnd and vin pins (didn’t have the jacks at the time).
I may be asking more questions about the SDI12 setup then too. I have a CTD sensor we want to use in this manner as well.