CT-N Series Specification

Compact Non-contact Infrared Thermometer

Page

4 of 5

1.0.1

- Sample Code

#include <MsTimer2.h>

// Timer library.

#include <ModbusRtu.h>

// Modbus library.

#include "SoftwareSerial.h"

// SoftwareSerial library

#define DISABLE 0

#define ENABLE

1

#define DE_RE 2

#define USING_SOFTWARESERIAL 4

#define ID 1

int8_t Timer_Flag = 0, Data_Print = DISABLE;

uint16_t au16data[2];

int16_t Object, Ambient;

SoftwareSerial mySerial(3, 5);

// RX 3, TX 5

Modbus master(0,USING_SOFTWARESERIAL,DE_RE);

// Modbus Master, 4:Using SoftwareSerial , DE/RE 2

modbus_t telegram;

// Master query structure

void setup() {

Serial.begin(9600);

// for Serial Monitor (Ctrl + Shift + M )

master.begin(&mySerial, 19200);

// begin the ModBus object.

master.setTimeOut( 25 );

// Modbus timeout : 25 ms

Serial.println("Waiting for sensor initialization time");

delay(1000);

// Wait for sensor initialization time

MsTimer2::set(500, timerISR);

// Timer interval : 500ms.

MsTimer2::start();

// Timer Start

}

void loop() {

if(Timer_Flag) {

// Check timer interrupt

Timer_Flag = 0;

Transfer_Data(ID);

// Request data transmission : Timer cycle

}

if(master.getState() == COM_WAITING) {

// Get modbus master state : waiting for answer

master.poll();

Data_Print = ENABLE;

}

if ((master.getState() == COM_IDLE) && (Data_Print == ENABLE)) {

// Get modbus master state : idle

if(master.getLastError() == 0 ){

// Get the last error in the protocol processor (0: No error)

Object = au16data[0];

Ambient = au16data[1];

Serial.print("Object Temp: ");

Serial.print(float(Object)/10, 1);

// celsius

Serial.print("

Ambient Temp: ");

Serial.println(float(Ambient)/10, 1);

}

else if(master.getLastError() == NO_REPLY) {

// Time-out

Serial.println("No reply.");

}

Data_Print = DISABLE;

}

}

void timerISR() { Timer_Flag = 1; }

// Timer Interrupt Service Routine

void Transfer_Data(uint8_t uid) {

if( (uid == 0) &&(uid>200) ) {

// ID : 1~200

uid = 1;

}

// Do not change the parameter values below.

telegram.u8id = uid;

// slave ID

telegram.u8fct = 3;

// function code = 03 (Read Holding Registers)

telegram.u16RegAdd = 40002;

// start address in slave

telegram.u16CoilsNo = 2;

// number of elements to read

telegram.au16reg = au16data;

// pointer to a memory array in the Arduino

master.query( telegram );

// send query

}