Intelligent Home Technology consists of devices or appliances, which are receivers and the means of controlling the system such as keypads or remote controls which are transmitters. If one wants to turn off an electrical appliance in a room, the transmitter will generate a message in numerical code which includes:
1. A code which contains actual command ‘turn off’.
2. An alert message to the system that it is issuing a message.
3. An identifying unit number for device that receives the command.