Communication apparatus and control method for the communication apparatus

1. A communication apparatus comprising:

a connection notifying unit that causes a communication destination party to detect a connection;

an interface unit that requires initialization, and controls a communication with the communication destination party after the initialization is completed; and

a connection notification control unit that changes a state of the connection notifying unit to a state of causing the communication destination party to detect the connection during a period from a start of the initialization of the interface unit before a completion of the initialization of the interface unit.

2. The communication apparatus according to claim 1 , wherein the connection notification control unit changes the state of the connection notifying unit to the state of causing the communication destination party to detect the connection upon a start of the initialization of the interface unit.

3. The communication apparatus according to claim 1 , wherein the connection notification control unit changes the state of the connection notifying unit to the state of causing the communication destination party to detect the connection during a period from a time when a state of a device in which the interface unit is provided is changed to a predetermined state to the completion of the initialization of the interface unit.

4. The communication apparatus according to claim 1 , wherein the connection notification control unit changes the state of the connection notifying unit to a state of causing the communication destination party not to detect the connection during a suspension of a startup processing of a device in which the interface unit is provided or a initialization of the interface unit.

5. The communication apparatus according to claim 1 , wherein the connection notifying unit causes the communication destination party to detect the connection by pulling up the potential of a predetermined signal line among signal lines connecting the interface unit and the communication destination party.

6. The communication apparatus according to claim 1 , in which the interface unit includes a master station, a slave station, and a communication line that couples the master station to the slave station,

the slave station including a circuit that pulls up an electric potential of the communication line to a predetermined value, and maintains the electric potential of the communication line at the predetermined value by means of the circuit upon turning on the power, and

the master station including a detector that detects the electric potential of the communication line maintained at the predetermined value by means of the circuit so as to detect the slave station, and taking an initiative for the communication with the slave station when the master station detects the slave station by means of the detector, the apparatus being provided in a slave station of a bus communication system,

wherein the communication destination party is the master station.

7. A slave station in a bus communication system that comprises a master station, a slave station, and a communication line that couples the master station to the slave station,

the slave station including a circuit that pulls up an electric potential of the communication line to a predetermined value, and maintains the electric potential of the communication line at the predetermined value by means of the circuit upon turning on the power,

the master station including a detector that detects the electric potential of the communication line maintained at the predetermined value by means of the circuit so as to detect the slave station, and taking an initiative for the communication with the slave station when the master station detects the slave station by means of the detector, the apparatus being provided in the bus communication system,

wherein the electric potential of the communication line is maintained by the circuit at the predetermined value during a period from a start of initialization of the slave station before a completion of the initialization of the slave station.

8. A control method for a communication apparatus comprising a connection notifying unit that causes a communication destination party to detect a connection; and an interface unit that requires initialization and controls a communication with the communication destination party after a completion of the initialization of the interface unit, wherein

a state of the connection notifying unit is changed to a state of causing the communication destination party to detect the connection during a period from a start of the initialization of the interface unit to a completion of the initialization of the interface unit.

9. The control method for a communication apparatus according to claim 8 , wherein the state of the connection notifying unit is changed to the state of causing the communication destination party to detect the connection upon a start of the initialization of the interface unit.

10. The control method for a communication apparatus according to claim 8 , wherein the state of the connection notifying unit is changed to the state of causing the communication destination party to detect the connection during a period from a time when a state of a device in which the interface unit is provided is changed to a predetermined state to the completion of the initialization of the interface unit.

11. The control method for a communication apparatus according to claim 8 , wherein the state of the connection notifying unit is changed to a state of causing the communication destination party not to detect the connection during a suspension of a startup processing of a device in which the interface unit is provided or the initialization of the interface unit.

12. The control method for a communication apparatus according to claim 8 , wherein the communication destination party is caused to detect the connection by pulling up the potential of a predetermined signal line among signal lines connecting the interface unit and the communication destination party.

13. The control method for a communication apparatus according to claim 8 , in which the interface unit includes a master station, a slave station, and a communication line that couples the master station to the slave station,

the slave station including a circuit that pulls up an electric potential of the communication line to a predetermined value, and maintains the electric potential of the communication line at the predetermined value by means of the circuit upon turning on the power, and

the master station including a detector that detects the electric potential of the communication line maintained at the predetermined value by means of the circuit so as to detect the slave station, and taking an initiative for the communication with the slave station when the master station detects the slave station by means of the detector, the apparatus being provided in a slave station of a bus communication system,

wherein the communication destination party is the master station.

14. A control method for a slave station in a bus communication system comprising a master station, a slave station, and a communication line that couples the master station to the slave station,

the slave station including a circuit that maintains pulls UP an electric potential of the communication line to a predetermined value, and maintains the electric potential of the communication line at the predetermined value by means of the circuit upon turning on the power,

the master station including a detector that detects the electric potential of the communication line maintained at the predetermined value by means of the circuit so as to detect the slave station, and taking an initiative for the communication with the slave station when the master station detects the slave station by means of the detector,

wherein the electric potential of the communication line is maintained by the circuit at the predetermined value during a period from a start of initialization of the slave station before a completion of the initialization of the slave station.