Image capturing apparatus, accessory apparatus, and control method therefor

An accessory apparatus to which an image capturing apparatus is attachable, the accessory apparatus comprising:

• a communication control section configured to control reception of a signal from the image capturing apparatus through the first communication channel, reception of data from the image capturing apparatus through the third communication channel, and transmission of data to the image capturing apparatus through the second communication channel, and control transmission of accessory attribute information of the accessory apparatus through the second communication channel, wherein
• the communication control section is configured to transmit first accessory attribute information of the accessory attribute information through the second communication channel by using a first communication method and then switch from the first communication method to a second communication method different from the first communication method, and control communication so as to transmit second accessory attribute information of the accessory attribute information through the second communication channel by using the second communication method,
• the first communication method is a communication method in which, at a timing corresponding to reception, through the first communication channel, of a clock signal of which a signal level switches alternately between a first signal level and a second level different from the first signal level, reception of data through the third communication channel and transmission of data through the second communication channel are performed,
• the second communication method is a communication method in which, in response to transmission of data through the second communication channel in response to switching of the signal level of the first communication channel from the first signal level to the second signal level, data is received through the third communication channel, and
• the communication control section is implemented by at least one processor or circuitry, or combination thereof.

A control method for an image capturing apparatus to which an accessory apparatus is attachable and including a communication control section configured to control transmission of a signal to the accessory apparatus through a first communication channel, transmission of data to the accessory apparatus through a third communication channel, and reception of data from the accessory apparatus through a second communication channel and control reception of accessory attribute information of the accessory apparatus through the second communication channel, the control method comprising:

• receiving, by the communication control section, first accessory attribute information of the accessory attribute information through the second communication channel by using a first communication method and then switching from the first communication method to a second communication method different from the first communication method, and controlling communication so as to receive second accessory attribute information of the accessory attribute information through the second communication channel by using the second communication method, wherein
• the first communication method is a communication method in which, at a timing corresponding to transmission, through the first communication channel, of a clock signal of which a signal level switches alternately between a first signal level and a second level different from the first signal level, transmission of data through the third communication channel and reception of data through the second communication channel are performed, and
• the second communication method is a communication method in which, in response to reception, through the second communication channel, of data transmitted in response to switching of the signal level of the first communication channel from the first signal level to the second signal level, transmission of data is performed through the third communication channel.

A control method for an accessory apparatus to which an image capturing apparatus is attachable and including a communication control section configured to control reception of a signal from the image capturing apparatus through a first communication channel, reception of data from the image capturing apparatus through a third communication channel, and transmission of data to the image capturing apparatus through a second communication channel and control transmission of accessory attribute information of the accessory apparatus through the second communication channel, the control method comprising:

• transmitting, by the communication control section, first accessory attribute information of the accessory attribute information through the second communication channel by using a first communication method and then switching from the first communication method to a second communication method different from the first communication method, and controlling communication so as to transmit second accessory attribute information of the accessory attribute information through the second communication channel by using the second communication method, wherein
• the first communication method is a communication method in which, at a timing corresponding to reception, through the first communication channel, of a clock signal of which a signal level switches alternately between a first signal level and a second level different from the first signal level, reception of data through the third communication channel and transmission of data through the second communication channel are performed, and
• the second communication method is a communication method in which, in response to transmission of data through the second communication channel in response to switching of the signal level of the first communication channel from the first signal level to the second signal level, data is received through the third communication channel.