#include <SoftwareSerial.h>
#include <Wire.h>
#define RE 7
#define DE 8
 
const byte O2[] = {0x01 ,0x03 ,0x00 ,0x00 ,0x00 ,0x02 ,0xC4 ,0x0B};
 
byte values[20];
SoftwareSerial mod(10, 11); // RO / DI
 
void setup() {
Serial.begin(4800);
mod.begin(4800);
pinMode(RE, OUTPUT);
pinMode(DE, OUTPUT);
}
 
void loop() {
int val1 = 0 ;
Calculate();
//val1 = ((values[5]*256)+values[8]);
val1 = (values[4]);
Serial.print("v: ");
Serial.println(val1);


delay(1000);
}
 
byte Calculate() {
  digitalWrite(DE, HIGH);
  digitalWrite(RE, HIGH);
  delay(10);
  if (mod.write(O2, sizeof(O2)) == 8) {
    digitalWrite(DE, LOW);
    digitalWrite(RE, LOW);
    for (byte i = 0; i < 11; i++) {
      //Serial.print(mod.read(),HEX);
      values[i] = mod.read();
      //Serial.print(values[i]);
      //Serial.print(" ");
    }
    Serial.println();
  }
  //return values[6];
}