Eastron SDM630 with Modbusmaster

[yentl_m]

hello, i would really appreciate some help with the problem i'm facing.
I'm trying to read in modbus registers from a energymeter.

i have succesfully read registers from a Schneider IEM 3150 meter, but now i have to read from the Eastron sdm630 meter and i receive errorcode 224, which means invalid response slave ID.

I am using the MAX485 module with DE and RE connected to pin 2.
Pin 9 and 10 are respectively connected to RO and DI.

This is my code now.

#include <ModbusMaster.h>
#include <SoftwareSerial.h>
#include <SD.h>
#define TxEnable 2


// instantiate ModbusMaster object
ModbusMaster node;
SoftwareSerial mySerial(9,10); 
File myFile;

void preTransmission()
{
  digitalWrite(TxEnable, 1);
  

}

void postTransmission()
{

  digitalWrite(TxEnable, 0);
  

  
}




void setup()
{
  // use Serial (port 0); initialize Modbus communication baud rate
  Serial.begin(9600);
  mySerial.begin(9600);
  node.begin(1, mySerial);
  pinMode(TxEnable,OUTPUT);
  node.preTransmission(preTransmission);
  node.postTransmission(postTransmission);
  
}
void loop()
{
  uint8_t result;
  uint8_t  Test;

  Test = node.available();
  result = node.readInputRegisters(0x0000 ,2);
  Serial.println(result);
  delay(2500);
    
   
}

Thank you in advance.

[pylon]

Check the settings of baudrate, parity, stop bits and Modbus ID.

Check that you don't got the M-Bus variant. According to the manual the M-Bus variant will let you set an ID after setting the bus address.

[yentl_m]

Dear, thanks for taking your time anwering this thread. Turns out my MAX485 module was defective, because it worked with another MAX485 module.