Adaptor device, imaging apparatus, and method for controlling same

A method for controlling an adaptor device to be attached between an imaging apparatus and an accessory device, the method comprising:

• controlling communication with the imaging apparatus via a first contact, a second contact, and a third contact, and communication with the accessory device via a fourth contact and a fifth contact,
• wherein the controlling includes performing communication in a first communication mode in which transmission of data via the fourth contact based on reception of data from the first contact or transmission of data via the second contact based on reception of data via the fifth contact is controlled and communication in a second communication mode different from the first communication mode, and in the second communication mode, a second command and data are received via the first contact and then the data is transmitted via the fourth contact, and
• wherein the communication in the first communication mode is performed based on connection detection communication with the accessory device in the second communication mode and a first command corresponding to an instruction to enter the first communication mode.

A method for controlling an imaging apparatus to which an accessory device is attached via an adaptor device, the method comprising:

• controlling communication with the adaptor device via a first contact, a second contact, and a third contact,
• wherein the controlling includes performing communication in a first communication mode in which communication with the accessory device via the adaptor device is controlled via the first contact and the second contact and communication in a second communication mode different from the first communication mode, and in the second communication mode, a second command and data are transmitted via the first contact, and
• wherein the communication in the first communication mode is performed based on connection detection communication with the accessory device in the second communication mode and transmission of a first command corresponding to an instruction to enter the first communication mode.