I’m new to this Arduino Portenta Machine Management (PMC) board. Sadly I can’t discover many sources on this specific board. I’m attempting to implement communication between HMI (Delta DOP-103BQ) and an Arduino Portenta machine management utilizing modbus communication by RS485 cable, to regulate the LED state within the PMC by enabling/disabling the button within the HMI.

I created a easy mission within the DIA display screen software program, positioned a button within the display screen and gave the learn tackle as B2 in Link2 kind.
I wrote this Arduino code on my own, please level out what I did improper within the code…

#embrace <ArduinoRS485.h>
#embrace <ArduinoModbus.h>
#embrace <Arduino_MachineControl.h>

arduino::UART _UART0_{ PA_0, PI_9, NC, NC };
RS485Class rs485{ _UART0_, PinNameToIndex(PA_0), PinNameToIndex(PI_13), PinNameToIndex(PI_10) };

machinecontrol::DigitalOutputsClass digital_outputs;

void setup(){
  Serial.start(115200);
  Serial.println("Begin");
  digital_outputs.setLatch();

  rs485.setDelays(1,1);
  ModbusRTUServer.start(rs485,1, 115200, SERIAL_8N1);
  ModbusRTUServer.configureCoils(0x00, 10);
  ModbusRTUServer.configureHoldingRegisters(0x00, 10);
  if(ModbusRTUServer.holdingRegisterRead(0x01) == 1){
    digital_outputs.setAll(255); 
    Serial.println("All Channels/led's turned on");
  } else {
    digital_outputs.setAll(0);
    Serial.println("All Channels/led's turned off");
  }
}
void loop() {
  ModbusRTUServer.ballot();
}

I do not know which operate code to make use of to make the communication occur. All I wish to do is make this built-in LED activate and off once I press the button within the HMI.

Wire connection:
RS485 cable for connecting the HMI and Arduino PMC in RS485 cable-
brown wire linked to the RXN485 pin
yellow wire linked to the TXN485 pin
inexperienced linked to floor.

I’d be glad if anybody may assist me with this.