Patent ID: 7990260

Claim:
An electric device comprising: a communication unit configured to transmit and receive from a plurality of first electric devices, and a normality determination unit which performs a first determination, when a first used in automatic address setting in which an address is assigned to each of said plurality of first electric devices from at least one of said plurality of first electric devices is normally received, that a communication function of said electric device is normal, performs a second determination, when a second signal used in normal communication from at least one of said plurality of first electric devices is normally received after said automatic address setting, that the communication function of said electric device is normal, and performs a third determination, when said second signal fails to be received from all of said plurality of first electric devices in a predetermined time period after said second signal is normally received, that it is not asserted that said communication function of said electric device is normal, and maintains said first determination when said second signal is never received normally from all of said plurality of first electric devices after said automatic address setting.