If you run 3.6.x, you need a serial inverter, documented here
Otherwise, you can try 3.7.0-dev from the repository and use SERIAL_OPTIONS to invert your com signal.
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If you run 3.6.x, you need a serial inverter, documented here
Otherwise, you can try 3.7.0-dev from the repository and use SERIAL_OPTIONS to invert your com signal.