View source for EPEVER Solar Controller RS485 MODBUS test

==Synopsis==
==Notes==

This was developed to test communication to the EPEVER AN Solar controller from the Arduino



==Code==
<syntaxhighlight lang="C++" line='line'>
//Power is not currently working for battery or panel

#include <ModbusMaster.h>


#define MAX485_DE   49
#define MAX485_RE   48

#define PANEL_VOLTS     0x00
#define PANEL_AMPS      0x01
#define PANEL_POWER_L   0x02
#define PANEL_POWER_H   0x03
#define BATT_VOLTS      0x04
#define BATT_AMPS       0x05
#define BATT_POWER_L    0x06
#define BATT_POWER_H    0x07
#define OVERVOLT_DISC   0x00
#define CHARGING_LIMIT  0x01
#define OVERVOLT_RECON  0x02
#define EQUILIBRIUM_CV  0x03
#define BOOST_CV        0x04
#define FLOAT_CV        0x05
#define BOOST_RECON     0x06


// instantiate ModbusMaster object
ModbusMaster node;

//#include <SoftwareSerial.h>

//SoftwareSerial mySerial(10, 11); // RX, TX

void setup()
{
  Serial.begin(115200);
  while (!Serial) {
    ;
  }
  Serial.println("Moooooo!");

  pinMode(MAX485_RE, OUTPUT);
  pinMode(MAX485_DE, OUTPUT);
  // Init in receive mode
  digitalWrite(MAX485_RE, 0);
  digitalWrite(MAX485_DE, 0);

  // Modbus at 115200 baud
  Serial1.begin(115200);

  // EPEver Device ID 1
  node.begin(1, Serial1);

  // Callbacks
  node.preTransmission(preTransmission);
  node.postTransmission(postTransmission);
}

void loop()
{
  uint8_t result;

  // Read 8 registers starting at 0x3100)
  node.clearResponseBuffer();
  result = node.readInputRegisters(0x3100, 8);

  if (result == node.ku8MBSuccess)
  {
    Serial.print("VPanel: ");
    Serial.println(node.getResponseBuffer(PANEL_VOLTS)/100.0f);
    Serial.print("IPanel: ");
    Serial.println(node.getResponseBuffer(PANEL_AMPS)/100.0f);
    Serial.print("PPanel: ");
    Serial.println((node.getResponseBuffer(PANEL_POWER_L) +
                    node.getResponseBuffer(PANEL_POWER_H) << 16)/100.0f);
   
    Serial.print("VBatt: ");
    Serial.println(node.getResponseBuffer(BATT_VOLTS)/100.0f);
    Serial.print("Ibatt: ");
    Serial.println(node.getResponseBuffer(BATT_AMPS)/100.0f);
    Serial.print("PBatt: ");
    Serial.println((node.getResponseBuffer(BATT_POWER_L) +
                    node.getResponseBuffer(BATT_POWER_H) << 16)/100.0f);                   
    Serial.println();
    Serial.println();
  } else {
    Serial.print("Miss read, ret val:");
    Serial.println(result);
  }
  //delay(1000);

  // Read 6 registers starting at 0x9003)
  node.clearResponseBuffer();
  result = node.readHoldingRegisters(0x9003, 7);

  if (result == node.ku8MBSuccess)
  {
    Serial.print("Overvolt Disconnect Voltage: ");
    Serial.println(node.getResponseBuffer(OVERVOLT_DISC)/100.0f);
    Serial.print("Charging Limit Voltage: ");
    Serial.println(node.getResponseBuffer(CHARGING_LIMIT)/100.0f);
    Serial.print("Overvolt Disconnect Voltage: ");
    Serial.println(node.getResponseBuffer(OVERVOLT_DISC)/100.0f);
    Serial.print("Overvolt Reconnect Voltage: ");
    Serial.println(node.getResponseBuffer(OVERVOLT_RECON)/100.0f);
    Serial.print("Equilibrium Charge Voltage: ");
    Serial.println(node.getResponseBuffer(EQUILIBRIUM_CV)/100.0f);
    Serial.print("Boost Charging Voltage:  ");
    Serial.println(node.getResponseBuffer(BOOST_CV)/100.0f);
    Serial.print("Float Charging Voltage: ");
    Serial.println(node.getResponseBuffer(FLOAT_CV)/100.0f);
    Serial.print("Boost Reconnect Voltage: ");
    Serial.println(node.getResponseBuffer(BOOST_RECON)/100.0f);
                  
    Serial.println();
    Serial.println();
  } else {
    Serial.print("Miss read, ret val:");
    Serial.println(result);
  }

  delay(2000);
}

void preTransmission()
{
  digitalWrite(MAX485_RE, 1);
  digitalWrite(MAX485_DE, 1);
}

void postTransmission()
{
  digitalWrite(MAX485_RE, 0);
  digitalWrite(MAX485_DE, 0);
}

</syntaxhighlight>