Patent ID: 8266355

Claim:
An electronic apparatus for transmitting and receiving a signal through a single wire, the electronic apparatus comprising: a sub-electronic apparatus configured to transmit a detection signal containing status information through a single wire and perform a predetermined operation upon receiving a response signal to the detection signal; and a main electronic apparatus configured to receive the detection signal through the single wire and transmit the response signal having a different signal format from the detection signal to the sub-electronic apparatus, wherein the main electronic apparatus includes a control unit configured to transmit the response signal according to the status information upon receiving the detection signal, and a switching unit configured to switch a transmission path therein according to a reception of the detection signal and a transmission of the response signal, the sub-electronic apparatus includes a detection unit configured to detect an internal status of the sub-electronic apparatus, and an operation unit configured to perform the predetermined operation according to the response signal, and the switching unit includes a first switch configured to be opened when the detection signal is received and closed when the response signal is transmitted to form a transmission path for the response signal, a detection resistor electrically connected to the detection unit of the sub-electronic apparatus and configured to receive a predetermined operating power and detect internal status of the sub-electronic apparatus, and a second switch configured to be closed before the detection signal is received to electrically connect the detection resistor and the detection unit and opened when the response signal is transmitted.