Reply To: Modbus with temperature/humidity/gas sensor .

[Nestor973]

#include <Controllino.h>
#include “ModbusRtu.h”
#define MasterModbusAdd 0
#define SlaveModbusAdd 1
#define RS485Serial 3

String result;
uint16_t au16data[16];
uint8_t u8state;

Modbus master(SlaveModbusAdd, RS485Serial, 0);

modbus_t telegram;

unsigned long u32wait;

void setup() {

Serial.begin(9600);
while (!Serial){}
Serial.println(“Connecting to Serial3 “);
master.begin(19200);
master.setTimeOut(5000); // if there is no answer in 5000 ms, roll over
u32wait = millis() + 2000;
u8state = 0;
telegram.u8id = 1; // slave address
telegram.u8fct = 4; // function code (this one is registers read)
telegram.u16RegAdd = 1; // start address in slave
telegram.u16CoilsNo = 1; // number of elements (coils or registers) to read
telegram.au16reg = au16data; // pointer to a memory array in the Arduino

}

void loop() {

switch( u8state ) {

case 0:

if (millis() > u32wait) u8state++; // wait state

break;

case 1:

master.query(telegram); // send query (only once)
u8state++;
break;

case 2:

master.poll(); // check incoming messages
if (master.getState() == COM_IDLE) {
u8state = 0;
u32wait = millis() + 1000;
Serial.print(“ontvangen data: “);
Serial.println(au16data[0]);

}

break;

}

delay(200);

}

• This reply was modified 2 years, 10 months ago by  Nestor973.
• This reply was modified 2 years, 10 months ago by  Nestor973.
• This reply was modified 2 years, 10 months ago by  Nestor973.