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Data transfer apparatus with automatic transmission rate adjustment
| Details |
Inventors: Iizuka, Shinji; Kajinami, Mamoru; Kanno, Tetsuo;
Assignee: International Business Machines Corporation (Kanagawa-Ken, JP); Advanced Peripherals Technologies, Inc. (Armonk, NY)
Primary Examiner: Shin; Christopher B.
Assistant Examiner:
Attorney, Agent or Firm: Volpe and Koenig, P.C.
A data transfer apparatus includes a computer-side input and output unit for transmitting a data signal which is periodically updated, and a printer-side input and output unit for receiving the data signal transmitted from the computer-side input and output unit and detecting the logic level of the data signal. Particularly, this data transfer apparatus further includes a state transition time measuring circuit, a computer-side CPU, and a printer-side CPU cooperated to transmit a transition test data signal from the computer-side input and output unit in a tuning mode, measure the transition time of the transition test data signal received by the printer-side input and output unit, and adjust transfer parameters which define the transmission rate of the data signal to be transmitted from the computer-side input and output unit and a timing for detecting the logic level of the data signal, on the basis of a result of measurement. |
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DETAILED DESCRIPTION It is an object of the present invention to provide a data transfer apparatus capable of minimizing the data transfer time without causing an erroneous operation in a given operational environment.
In order to achieve the above object, according to the present invention, there is provided a data transfer apparatus comprising a transmission unit for transmitting a data signal which is periodically updated, a reception unit for receiving the data signal transmitted from the transmission unit and detecting a logic level of the data signal, and control means for controlling the transmission unit to transmit a transition test data signal in a tuning mode, measuring a transition time of the transition test data signal received by the reception unit, and adjusting on the basis of a result of measurement transfer parameters which define a transmission rate of data signal to be transmitted from the transmission unit and a logic level detection timing of the data signal.
In this data transfer apparatus, the control means controls the transmission unit to transmit the transition test data signal in the tuning mode, measures the transition time of the transition test data signal received by the reception unit, and adjusts on the basis of a result of measurement transfer parameters which define a transmission rate of the data signal to be transmitted from the transmission unit and a logic level detection timing of the data signal.
That is, the transmission rate of the data signal and the logic level detection timing can be optimized in a given operational environment in order to detect the logic level of the data signal immediately after completion of transition thereof without being influenced by the operational environment.
Even when the transmission unit and the reception unit are connected through a cable having a length larger than the standard length, a detection error can be prevented since the logic level of the data signal is not detected during transition thereof.
Further, even when the transmission unit and the reception unit are connected through a cable having a length smaller than the standard length, waste of time can be prevented since the timing of logic level detection is not delayed with respect to completion of transition of the data signal
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