Patent ID: 8805160

Claim:
A transmission device comprising: a first detection unit that detects a signal which is outputted from a display device to the transmission device, wherein the signal is used for determining whether an acquisition of information relating to the display device is allowed, wherein the information is used for detecting a capability of the display device; an acquiring unit that acquires the information from the display device after the acquisition of the information is allowed; a transmission unit that transmits image data, generated using the information acquired from the display device, to the display device via a transmission line; a second detection unit that detects whether the transmission line and a terminal resistor of the display device are connected; and a control unit that controls, based on a status of the signal detected by the first detection unit and a detection result of the second detection unit, whether the transmission unit transmits image data, generated using the information, to the display device via the transmission line, wherein the control unit causes the transmission unit not to transmit image data, generated using the information, to the display device via the transmission line if the acquisition of the information is allowed and the transmission line is not connected to the terminal resistor of the display device.