def get_power(self):
     return hex_to_float(self.msg[18:22])
 def get_current(self):
     return hex_to_float(self.msg[14:18])
 def get_voltage(self):
     return hex_to_float(self.msg[10:14])
 def get_power(self):
     return hex_to_float(self.msg[16:20])
 def get_current(self):
     return hex_to_float(self.msg[12:16])
 def get_voltage(self):
     return hex_to_float(self.msg[8:12])