Contoh program Modbus TCP Master

3. Contoh program Modbus TCP Master

#include <SPI.h>

#include <Ethernet.h>

#include <ModbusIP.h>

IPAddress server(192, 168, 1, 177);

EthernetClient client;

ModbusIP mb;

void setup()

{

  Ethernet.begin(mac);

  Serial.begin(9600);

  mb.client();

  if (!client.connect(server, 502))

  {

    Serial.println("Connection failed.");

    return;

  }

}

void loop()

{

  uint16_t data[6];

  int result = mb.readInputRegisters(1, 0, 6, data);

  if (result == mb.ku8MBSuccess)

  {

    Serial.print("Humidity: ");

    Serial.print(data[0]);

    Serial.print(" %\t Temperature: ");

    Serial.print(data[1]);

    Serial.println(" °C");

  }

  else

  {

    Serial.print("Error: ");

    Serial.println(mb.lastError());

  }

  delay(1000);

}