Power control for a controlled device and communication relay unit of an image processing apparatus

An image processing apparatus comprising:

• a control device that effects control of the image processing apparatus;
• and
• an electronic apparatus that includes a controlled device to be controlled by the control device, and a communication relay unit that relays communication between the controlled device and the control device,
• wherein the control device comprises:
• a connection unit that connects the control device and the electronic apparatus via a cable including a plurality of wires;
• a first power supply unit that supplies power from the image processing apparatus to the controlled device via a first power supply line among the plurality of wires, the first power supply line being connected to the controlled device;
• a second power supply unit that supplies power from the image processing apparatus to the communication relay unit via a second power supply line among the plurality of wires, the second power supply line being connected to the communication relay unit;
• and
• a main control unit that switches a power supply state by the first power supply unit and the second power supply unit between at least a first stop state in which power supply to the controlled device by the first power supply unit is continued and power supply to the communication relay unit by the second power supply unit is stopped and a second stop state in which power supply to the controlled device and the communication relay unit by the first power supply unit and the second power supply unit is stopped.