Patent ID: 8489790

Claim:
A control method for an extender to achieve a two-way transmission of information, the extender having a transmitting unit and a receiving unit, the method comprising steps in sequence of: (a) a transmitting terminal microprocessor unit of the transmitting unit stopping outputting image signal of an image signal modulating unit of the transmitting unit to an image signal demodulating unit of the receiving unit, stopping outputting voice signal of a voice signal modulating unit of the transmitting unit to a voice signal demodulating unit of the receiving unit, or stopping outputting serial data of a serial data modulating unit of the transmitting unit to a serial data demodulating unit of the receiving unit; (b) the transmitting unit sending a request signal to a receiving terminal microprocessor unit of the receiving unit through a circuit that is for stopping outputting the image signal from the image signal modulating unit to the image signal demodulating unit, that is for stopping outputting the voice signal from the voice signal modulating unit to the image signal demodulating unit, or that is for stopping outputting the serial data from the serial data modulating unit to the serial data demodulating unit; (b1) when a receiving terminal image signal detecting unit of the receiving unit detects the image signal modulation unit stops outputting the image signal, a receiving terminal serial data detecting unit of the receiving unit detects the voice signal modulating unit stops outputting voice signal, the receiving terminal microprocessor unit is informed; (b2) the receiving terminal microprocessor unit reading extended display identification data of a display device or peripheral data of a control device which is stored in a receiving terminal memory unit of the receiving unit; and (c) sending the extended display identification data or the peripheral data from the receiving unit to the transmitting unit.