Portenta MachineControl - Modbus RTU Server

Hardware Portenta Portenta Machine Control
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Hi All, I'm having trouble getting the ArduinoModbus 1.0.6 library ModbusRTUServer to work properly.

Has anyone successfully for this combination working ?

Edit: When i load the example RS485_halfduplex into 2 units they both communicate with each other fine.

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