The shield is programmed with an ICSP tool. Normally I use an Arduino Uno with the [ArduinoISP] sketch from the IDE's examples. An Uno runs at 5V so I also need an SPI level shifter to program the 3.3V RPUadpt bus manager. I now have a board for this on [Tindie], it is called [ICSP] though it is not an ICSP tool it is an SPI level shifter.
[Tindie]: https://www.tindie.com/products/ron-sut ... with-ioff/
Add RS-422 to a Controller node
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