readInputRegister static method
Implementation
static Uint8List readInputRegister(int slave,int addr,int size){
Uint8List data = Uint8List(4);
data[0] = 0xff & addr>>8 ;
data[1] = 0xff & addr;
data[2] = 0xff & size>>8;
data[3] = 0xff & size;
return modbus(slave, 0x04, data);
}