Transmission method of changing protocol and data processing apparatus using this method

Claim 2

A transmission method according to claim 1, characterized in that the second step includes; step (S6) for preventing, before a passage of a specified period without the first response signal received by the first data processing apparatus from the second data processing apparatus, the first data processing apparatus from transmitting the second request signal.

Claim 3

A transmission method according to claim 1, characterized in that the second step includes; fourth step (S1, S8 and S9) for repeating, when the first data processing apparatus receive neither the first nor the second response signals from the second data processing apparatus, the first, second and third steps by a specified number of times until the first data processing apparatus receives a second response signal to the second request signal from the second data processing apparatus.

Claim 4

A transmission method according to claim 2, characterized in that the fourth step includes; step (S10) for disconnecting, when the first data processing apparatus receives no second response signals from the second data processing apparatus after the second request signal is transmitted by the specified number of times, the second data processing apparatus from the first data processing apparatus.

Claim 5

A transmission method according to claim 1, characterized in that the first transmission step includes; third transmission step (S2) for transmitting a third request signal from the first data processing apparatus to the second data processing apparatus at a first transfer speed for requesting a change from the first transfer speed to a second transfer speed different from the first transfer speed; wherein the second transmission step includes; fourth transmission step (S6) for transmitting, after a passage of a specified period with not third response signals to the third request signal received by the first data processing apparatus from the second data processing apparatus, a fourth request signal from the first data processing apparatus to the second data processing apparatus at the second transfer speed for requesting a change from the first transfer speed to the second transfer speed.

Claim 6

A transmission method according to claim 3, characterized in that the fourth step includes; step for transmitting, when the first data processing apparatus receives no fourth response signals from the second data processing apparatus after the first, second and third steps are repeated by the specified number of times, a reset signal for initializing the second data processing apparatus from the first data processing apparatus to the second data processing apparatus.

Claim 7

A transmission method according to claim 3, characterized in that the fourth step includes; step for transmitting, when the first data processing apparatus receives no fourth response signals from the second data processing apparatus after the first, second and third steps are repeated by the specified number of times, a reset signal for initializing the second data processing apparatus from the first data processing apparatus to the second data processing apparatus by a second specified number of times until a fifth response signal as a response signal to the reset signal is transmitted from the second data processing apparatus to the first data processing apparatus.

Claim 8

A data processing apparatus comprising: means (2) for holding an attachable/detachable second data processing apparatus (P) and transmitting and receiving data to and from the second data processing apparatus; first means (3, S2) for transmitting a first request signal from the transmission means to the second data processing apparatus based on first protocol for requesting a change from the first protocol to a second protocol different from the first; second means (3, S6) for transmitting, when the first information processing does not receive any first response signals to the first request signal from the second data processing apparatus, a second request signal from the transmission means to the second data processing apparatus based on the second protocol for requesting the change from the first to the second protocol; and third means (3, S4 and S7) for determining, in accordance with receiving of a second response signal to the second request signal by the receiving means from the second data processing apparatus, whether data transfer with the second data processing apparatus should be executed or not.

Claim 9

A data processing apparatus according to claim 8, characterized in that the second means includes; means (3, S6) for preventing, before a passage of a specified period with first response signals received by the receiving means from the second data processing apparatus the second means from transmitting the second request signal.

Claim 10

A data processing apparatus according to claim 9, characterized in that the second means includes; fourth means (3, S1, S8 and S9) for repeating, when the first data processing apparatus receive neither the first nor the second response signals from the second data processing apparatus, procedures of the first, second and third means by a specified number of times until the receiving means receives a second response signal as a response signal to the second request signal from the second data processing apparatus.

Claim 11

A data processing apparatus according to claim 10, characterized in that the third transmission means includes; means (2, 3, S10) for disconnecting, when the receiving means receives no response signals from the second data processing apparatus after the second request signal is transmitted by the specified number of times, the second data processing apparatus from the holding means (2).

Claim 12

A data processing apparatus according to claim 8, characterized in that the first transmission means includes; third transmission means (2, 3, S2) for transmitting a third request signal from the transmission means to the second data processing apparatus at a first transfer speed for requesting a change from the first transfer speed to a second transfer speed different from the first; wherein the second transmission means includes; fourth transmission means (2, 3, S6) for transmitting, after a passage of a specified period with no third response signals to the third request signal received by the transmission means from the second data processing apparatus, a fourth request signal from the transmission means to the second data processing apparatus at the first transfer speed for requesting the change from the first transfer speed to the second transfer speed.

Claim 13

A data processing apparatus according to claim 10, characterized in that the fourth means includes; means (2, 3) for transmitting, when the receiving means receives no fourth response signals from the second data processing apparatus after the procedures are repeated by the specified number of times, a reset signal from the transmission means to the second data processing apparatus for initializing the second data processing apparatus.

Claim 14

A data processing apparatus according to claim 10, characterized in that the fourth means includes; means (2, 3) for transmitting, when the receiving means receives no fourth response signals from the second data processing apparatus after the procedures are repeated by the specified number of times, a reset signal from the transmission means to the second data processing apparatus for initializing the second data processing apparatus by a second specified number of times until a fifth response signal as a response signal to the reset signal is transmitted from the second data processing apparatus to the first processing apparatus.

Claim 15

A data transmission system comprising: a first data processing apparatus having; means (2) for holding a second data processing apparatus (P) and transmitting and receiving data to and from the second data processing apparatus; first means (3, S2) for transmitting a first request signal from the transmission means to the second data processing apparatus based on first protocol for requesting a change from the first protocol to second protocol different from the first protocol; second means (3, S6) for transmitting, when the first data processing apparatus does not receive any first response signals to the first request signal from the second data processing apparatus, a second request signal from the transmission means to the second data processing apparatus based on the second protocol for requesting the change from the first to the second protocol; and means (3, S4 and S7) for determining, in accordance with receiving of a second response signal to the second request signal by the receiving means from the second data processing apparatus, whether data transfer with the second data processing apparatus should be executed or not; the second data processing apparatus having; means (15) connected to the first data processing apparatus for receiving and transmitting data; means (11, 12, 13 and 14) for performing specified processing of the received data; and means (11, 12, 13 and 14) for changing protocol in accordance with the first or the second request signal from the first data processing apparatus and transmitting the first or the second response signal to the first data processing apparatus.

Claim 16

A transmission method according to claim 1, wherein the second step includes; step (S7) for returning to the first step when the first data processing apparatus receive neither the first nor the second response signals from the second data processing apparatus.