Electrical computers and digital data processing systems: input/ – Input/output data processing – Input/output access regulation
Reexamination Certificate
2006-04-25
2006-04-25
Torres, Joseph D. (Department: 2133)
Electrical computers and digital data processing systems: input/
Input/output data processing
Input/output access regulation
C714S799000
Reexamination Certificate
active
07035947
ABSTRACT:
It is an object to allow an output apparatus to certainly recognize an error when the error occurs at the time of a data transfer using an upper layer (IEEE 1284.4). In a communication system in which an information processing apparatus and an output apparatus can communicate data by using an interface constructed by the upper layer (IEEE 1284.4) and a lower layer (IEEE 1284), when the information processing apparatus detects an error at the time of a data communication using the upper layer, a predetermined command (device ID request) specified in the lower layer is used in order to allow the output apparatus to recognize the occurrence of the error.
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