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// Global variables

int Buffer[9];
byte x;
int VoltReadCommand[] ={0x08, 0x04, 0x00, 0x00, 0x00, 0x02, 0x71, 0x52}; // energy meter is no. 008 on modbus, voltage is in 00 00 register

ZUNO_SETUP_CHANNELS(
  ZUNO_METER(ZUNO_METER_TYPE_ELECTRIC, METER_RESET_DISABLE, ZUNO_METER_ELECTRIC_SCALE_VOLTS, METER_SIZE_FOUR_BYTES, METER_PRECISION_TWO_DECIMALS, getterVOLTS, NULL)
);


void setup() {
  Serial1.begin(9600);
  pinMode(2, OUTPUT);
  digitalWrite(2, LOW);
}

void loop() {
 delay(20);
 
 // Set pin to HIGH > Transmit mode
 digitalWrite(2, HIGH); 
 delay(5);
 // Send command to ModBus Meter
for (int i=0; i < 8; i++) Serial1.write(VoltReadCommand[i]);
 delay(5);

// Set pin to LOW > Receive mode
 digitalWrite(2, LOW);
 delay(5);

// Read reply in Buffer[];
for (int i=0; i < 9; i++) Buffer[i] = Serial1.read();  

// Convert to Float

 ((byte*)&x)[3]= Buffer[3];
 ((byte*)&x)[2]= Buffer[4];
 ((byte*)&x)[1]= Buffer[5];
 ((byte*)&x)[0]= Buffer[6];

 delay(1500);
}

byte getterVOLTS() {
 return (x);
}