Charge Controller RS-485 Guide

01 04 30 A0 00 01 XX XX

01 04 30 A0 00 01 XX XX

import minimalmodbus
import serial


instrument = minimalmodbus.Instrument(‘COM12’,1) # COM number will change depending on computer and port used


instrument.serial.baudrate = 9600 			# Sets the baud rate
instrument.serial.bytesize = 8				# Sets the byte size
instrument.serial.parity = serial.PARITY_NONE		# Specifies no parity bit
instrument.serial.stopbits = 1				# Specifies 1 stop bit
instrument.serial.timeout = 1				# Sets timeout value
instrument.mode = minimalmodbus.MODE_RTU	# Specifies the protocol


reg = instrument.read_register(36898,0,3) # Reads low voltage register value
# Arguments are: decimal register, number of decimals in data, function code
print("Low Voltage Protection: ", reg/100)


reg = instrument.write_bit(0,1,5) # Writes load output value to ON
# Arguments are: decimal register, value to store, num of decimals, function code,
# and whether the data is signed/unsigned
if reg == None:
	print(“Write Success”)
	

#include <Arduino.h>
#include <ModbusMaster.h>   // import necessary libraries
#define Battery_Voltage_Address 0x30A0 // Register we want to read
#define MAX485_DE      D13    // Send/receive signal
#define usbSerial Serial    
ModbusMaster node;      // instantiate ModbusMaster object
double load = 1;        // Setting load output to ON


void preTransmission1()   // Sets pre-transmission signal (trans)
{
  digitalWrite(MAX485_DE, 1);
}


void postTransmission1()    // Sets post-transmission signal (rec)
{
  digitalWrite(MAX485_DE, 0);
}


void setLoad(){       // Turns controller output ON/OFF
    if (load == 1){
    Serial.println("Output ON");
    node.writeSingleCoil(0x0000, 1); // Write the value to the register
    delay(1000);  
  }
  else{
    Serial.println("Output OFF");
    node.writeSingleCoil(0x0000, 0);
    delay(1000);  
  }
}


int readModbusRegister(uint16_t regAddress)
{
  uint8_t result;
  uint16_t data;
  int value = -1;
  int numRead = 1;


  Serial.print("Reading Modbus Register at address: 0x");
  Serial.println(regAddress, HEX);


  result = node.readInputRegisters(regAddress, numRead); // Read register


  if (result == node.ku8MBSuccess) {    // Check for success
    Serial.print("   Response Bytes: ");
    for (uint8_t i = 0; i < numRead; i++) {
      Serial.print(node.getResponseBuffer(i), HEX);
      Serial.print(" ");
    }
    Serial.println();



    for (uint8_t i = 0; i < numRead; i++) {
    }
    data = node.getResponseBuffer(0);
    value = data;


  } else {              // Else error
    Serial.print("Error reading input register " + String(regAddress) +  ". Error code: ");
    Serial.println(result, HEX);
  }


  delay(1000);
  return value;           // return register value
}



void setup()
{
  pinMode(MAX485_DE, OUTPUT);   // Set pin modes and values
  digitalWrite(MAX485_DE, 0);


  Serial.begin(9600);       // Begin serial communication
  Serial1.begin(9600);
  node.begin(1, Serial1);     // Modbus slave ID 1, Serial1


  // Callbacks allow us to configure the RS-485 transceiver correctly
  node.preTransmission(preTransmission1);
  node.postTransmission(postTransmission1);
}


void loop()
{ int res = 0;
  res = readModbusRegister(Battery_Voltage_Address); // Read/print address
  delay(1*60*1000);           // Wait 5 mins
}