I have a pair of circuit boards communicating between each other. There are 3 wires, one is ground. I'm not sure if data is on both lines, or if one is signal and the other is power, but the whole system is 12 volts. I wondering what communication protocols I should look at. On the scope both lines (not gnd) seem to have signals on them.

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    \$\begingroup\$ j0h - Hi, Please add clear scope traces of the signals and details of the devices involved, into your question. Also include details of all your analysis so far, to avoid site members responding with details that you already know, or suggestions which you have already considered and eliminated. Thanks. \$\endgroup\$
    – SamGibson
    Nov 25 at 1:57
  • \$\begingroup\$ I can do it tomorrow when I return home. \$\endgroup\$
    – j0h
    Nov 25 at 2:09