RS485 Wind Direction Transmitter

[zeldhris]

@zeldhris

node.begin(2, Serial); // wind sensor id =

I understand that this part initializes my serial port for Modbus communication but this should not be enough to establish a link with my sensor?

@zeldhris

  if (resultMain == node.ku8MBSuccess) 
  {
    Serial.print("Result: ");
    Serial.println(node.getResponseBuffer(0x10));
  } 

In the same way, this process should be executed correctly if the Modbus communication is already initialized or I need something else?
I have been guided by the following code as a reference:

#include <ModbusMaster.h>

#define MAX485_DE      3
#define MAX485_RE_NEG  2


ModbusMaster node;

void preTransmission()
{
  digitalWrite(MAX485_RE_NEG, 1);
  digitalWrite(MAX485_DE, 1);
}
void postTransmission()
{
  digitalWrite(MAX485_RE_NEG, 0);
  digitalWrite(MAX485_DE, 0);
}
void setup()
{
  pinMode(MAX485_RE_NEG, OUTPUT);
  pinMode(MAX485_DE, OUTPUT);

  
  digitalWrite(MAX485_RE_NEG, 0);
  digitalWrite(MAX485_DE, 0);

  Serial.begin(9600);
  
  // Modbus slave ID 2
  node.begin(2, Serial);
  

  node.preTransmission(preTransmission);
  node.postTransmission(postTransmission);
}
//bool state = true;
void loop()
{
  uint8_t result;

  result=node.readHoldingRegisters(0x0017, 1);

  
  if (result == node.ku8MBSuccess)
  {
    Serial.print("Vbatt: ");
    Serial.println(node.getResponseBuffer(0x00));

  }
  delay(500);
}