Smart home technology was developed in 1975, when a company in Scotland developed X10. X10 allows compatible products to talk to each other over the already existing electrical wires of a home. All the appliances and devices are receivers, and the means of controlling the system, such as remote controls or keypads, are transmitters. If you want to turn off a lamp in another room, the transmitter will issue a message in numerical code that includes the following:
•An alert to the system that it’s issuing a command,
•An identifying unit number for the device that should receive the command and
•A code that contains the actual command, such as “turn off.”
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