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    This is exactly the method I use for testing development boards I make. A shield is attached which links 50% of the pins to the other 50% through 100r resistors. Scanning the pins with one set low checks for both proper continuity as well as shorts to other pins. Commented Jul 10, 2018 at 22:39
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    Beautiful. This is the paradigm I was missing. It totally hadn't occurred to me that I could actually measure under different configurations in rapid succession. My options for building things just exploded. I'll try it out. Commented Jul 11, 2018 at 5:57
  • This worked wonderfully. I much prefer it over my analog approach, as I don't need to worry about defining expected voltage ranges for each input. And of course, I didn't need to check all 12*11/2 combinations, since I really just need to know which wires are connected to each terminal (6*6 checks) - if two terminals or two wires were connected, it would necessarily result in the wrong combination of wires connected to a given terminal. It is however important to check for more than the expected 6 connections, to handle the case where the user somehow bridges all the terminals. Thanks! Commented Jul 12, 2018 at 5:04