Modbus RTU and PM5110 Schneider Wattimeter

[wgirardi]

Hey guys, I'm needing to read the data from a power meter PM5110 Schneider using converter rs485 and Arduino Mega2560, but my code is not being able to read the data . I've followed several similar tutorials but it didn't work out.

Follow my code below

#include "REG_PM5110.h"
#include <ModbusMaster.h>

#define baud 9600
#define timeout 100
#define  polling 100
#define retry_count 10
ModbusMaster node;

#define MAX485_DE      22
#define MAX485_RE_NEG  23

void preTransmission()
{
  digitalWrite(MAX485_RE_NEG, 1);
  digitalWrite(MAX485_DE, 1);
}

void postTransmission()
{
  digitalWrite(MAX485_RE_NEG, 0);
  digitalWrite(MAX485_DE, 0);
}

//------------------------------------------------
// Convent 32bit to float
//------------------------------------------------
float HexTofloat(uint32_t x) 
{
  return (*(float*)&x);
}

uint32_t FloatTohex(float x) 
{
  return (*(uint32_t*)&x);
}
//------------------------------------------------

float Read_Meter_float(char addr , uint16_t  REG) 
{
  float i = 0;
  uint8_t result,j;

  uint16_t data[4];
  uint32_t value = 0;
  node.begin(ID_meter,Serial1);
  node.preTransmission(preTransmission);
  node.postTransmission(postTransmission);
  
  result = node.readHoldingRegisters(REG,4); ///< Modbus function 0x03 Read Holding Registers
  delay(500);
  if (result == node.ku8MBSuccess) 
  {
    for (j = 0; j < 4; j++)
    {
      data[j] = (node.getResponseBuffer(j));
    }
    value = data[0];
    value = value << 16;
    value = value + data[1];
    i = HexTofloat(value);
    Serial.println("Connect modbus Ok.");
    return i;
  } else 
  {
    Serial.print("Connect modbus fail. REG >>> "); Serial.println(REG); // Debug
    delay(1000); 
    return 0;
  }
}

void GET_METER() 
{     // Update read all data
  delay(1000);                            
    for (char i = 0; i < Total_of_Reg ; i++)
    {
      DATA_METER [i] = Read_Meter_float(ID_meter, Reg_addr[i]);
    } 
}

//**************************************************************************************************************
void setup() 
{
  Serial.begin(9600);
  Serial1.begin(9600,SERIAL_8N2);

  Serial.println(F("Test"));
  pinMode(MAX485_RE_NEG, OUTPUT);
  pinMode(MAX485_DE, OUTPUT);
  // Init in receive mode
  digitalWrite(MAX485_RE_NEG, 0);
  digitalWrite(MAX485_DE, 0);
}

void loop() 
{
  //float x = Read_Meter_float(ID_meter,Reg_Volt);
  GET_METER();
  Serial.println();
  Serial.print("Current = "); Serial.print(DATA_METER[0]);Serial.println(" A");
  Serial.print("Voltage =  "); Serial.print(DATA_METER[1]);Serial.println(" V");
  Serial.print("Frequency =  "); Serial.print(DATA_METER[2]);Serial.println(" Hz");
  Serial.print("Power =  "); Serial.print(DATA_METER[3]);Serial.println(" Kw");
  delay(3000);
}

The list of equipment records is at this link

https://download.schneider-electric.com/files?p_enDocType=User+guide&p_File_Name=PM5100_PM5300_PMC+Register+List.xls&p_Doc_Ref=PM5100-PM5300_PublicRegisterList&_ga=2.117493450.272376122.1666886479-1122591807.1662051886

PM5110.ino (2.5 KB)
REG_PM5110.h (361 Bytes)