I had semi-similar issues also setting up the 7i with Duet WiFi. The 1m servo cable that I received would allow the panel to power up but would not communicate with the board. Some research found that less than 1ohm resistance through wiring was needed. I needed to use a little larger conductor wiring. Also as DC suggested, make sure connectors are pinned correctly.
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Posts made by mattrpelto
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RE: Paneldue woes