Transmission method of changing protocol and data processing apparatus using this method
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United States of America Patent
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May 5, 1998
Grant Date -
N/A
app pub date -
Mar 21, 1996
filing date -
Mar 22, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
As a method for transferring data between a first data processing apparatus and a second data processing apparatus connected thereto attachably and detachably, there is provided a transmission method of changing protocol having a step for transmitting a first request signal from the first data processing apparatus to the second data processing apparatus, based on a first protocol, for requesting a change from the first protocol to second protocol, a second transmission step for transmitting, when no first response signals to the first request signal are received from the second data processing apparatus, a second request signal to the second data processing apparatus, based on the second protocol, for requesting the change from the first to the second protocol, and a step for determining, in accordance with receiving of a second response signal to the second request signal from the second data processing apparatus, whether data transfer between the apparatuses should be executed or not. There is also provided a data processing apparatus using this method.
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