Modbus Energy Meter Reading using GPRS MQTT Protocol - Indino 4.0

Energy meters with an integrated Serial RS485 Modbus interface allow direct reading of all relevant data, such as energy , current and voltage , frequency and form factor for every phase and active and reactive power for every phase and for the three phases

step 1- Select the required parameter and register address of the modbus energy Meter as shown in the below given image .

Step 2- Copy the code and change the required parameter 

Step 3 - Execute the code 

Step 4 Watch the expected result at cloud MQQT Server

Test Setup

/*

* The example file shows making a phone call

*  

* Pin Connection :  

*  

*/

#include <IndinoDI.h>  

String data1;

/*    Cloud initialisation         */

char* host = "m16.cloudmqtt.com";

//char* host = "52.3.184.147";

char* port = "16997";

char* username = "eoszmzsz";

char* password = "at1yeUD1pERj";

char* topic = "meter";

char *APN = "INTERNET"; //Vodafone

uint8_t funCode = 0x04; //Read holding register

uint8_t slave_id = 1;

uint16_t start_addr = 3854; //Address to read frequency=3854

uint16_t start_addr1 = 3850; //Line to Neutral Voltage=3850

uint16_t start_addr2 = 3846; //Avg PF=3846

uint16_t len = 2; //Datatype is 32-bit Float for MFR 2810

uint16_t data[2] = {0};

uint8_t freq_hex_bytes[4] = {0};

float frequency = 0;

float voltage = 0;

float power = 0;

uint32_t VALUE;

char data2[80];

void setup()

{

Serial.begin(9600);

Serial3.begin(9600);

Indino_Modbus_Master_Init();

delay(2000);

pinMode(41, OUTPUT);

delay(2000);

Serial.println("Start..");

power_on(APN);

delay(1000);

}

void loop()

{

Indino_Modbus_Master_Read_Raw(funCode, slave_id, start_addr, len, data);

/*     place register values in byte array, lsb in position 0      */

freq_hex_bytes[3] = (data[1] & 0xFF00) >> 8;  

freq_hex_bytes[2] = (data[1] & 0x00FF);

freq_hex_bytes[1] = (data[0] & 0xFF00) >> 8;  

freq_hex_bytes[0] = (data[0] & 0x00FF);

/*    Convert to Float         */

memcpy(&frequency, freq_hex_bytes , 4);

Serial.print("Frequency =");

Serial.print(frequency,2);

Serial.println(" Hz");

delay(300);

Indino_Modbus_Master_Read_Raw(funCode, slave_id, start_addr1, len, data);

/*    place register values in byte array, lsb in position 0        */

freq_hex_bytes[3] = (data[1] & 0xFF00) >> 8;  

freq_hex_bytes[2] = (data[1] & 0x00FF);

freq_hex_bytes[1] = (data[0] & 0xFF00) >> 8;  

freq_hex_bytes[0] = (data[0] & 0x00FF);

/*      Convert to Float          */

memcpy(&voltage, freq_hex_bytes , 4);

Serial.print("Line to Neutral Voltage =");

Serial.print(voltage,2);

Serial.println(" volts");

delay(300);

Indino_Modbus_Master_Read_Raw(funCode, slave_id, start_addr2, len, data);

/*     place register values in byte array, lsb in position 0      */

freq_hex_bytes[3] = (data[1] & 0xFF00) >> 8;  

freq_hex_bytes[2] = (data[1] & 0x00FF);

freq_hex_bytes[1] = (data[0] & 0xFF00) >> 8;  

freq_hex_bytes[0] = (data[0] & 0x00FF);

/*     Convert to Float         */

memcpy(&power, freq_hex_bytes , 4);

Serial.print("Power factor =");

Serial.print(power,2);

Serial.println(" PF");

data1 ="Frequency=";

data1 +=frequency;

data1 +=",Voltage=";

data1 +=voltage;

data1 +=",Powerfactor=";

data1 +=power;

for(int i=0;i<data1.length();i++)

data2[i]=data1[i];

Serial.println(data2);

Indino_GPRS_Upload_MQTT(data2, APN, host, port, username, password, topic);

delay(3000);

}

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