@profdc9 The digit 1 is silk screened on the programming board and on the pack. And the physical setup of the connectors makes it very difficult to orient the connectors backwards. However Murphy is more robust than this. The cable itself can be reversed (left vs right in the picture.) The cable is not symmetrical, but does not have a key. It also has no silk screen on it, coloring, or any other indication of polarity. The only clue that it is asymmetric is that the trace on the left is fatter.
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