Information processing system connected by radio communication
First Claim
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1. A print control apparatus comprising:
- first determining means for determining whether or not data transmitted from an external device is a power-off command;
first control means for turning off a power supply to printing means when said determining means determines that the data from the external device is the power-off command;
detecting means for detecting a signal transmitted from the external device prior to a data transmission;
means for discriminating whether the power supply to the printing means has been turned off by the power-off command from the external device;
second control means for, in response to an output of the detecting means, turning on the power supply to the printing means when a discrimination of the discriminating means is negative, and for, even if the signal is transmitted from the external device prior to a data transmission, leaving the power supply off when the discrimination of the discriminating means is positive.
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Abstract
To control an information processing system in which a host unit is connected by radio communication to a slave unit, the host unit transmits data and a selected one of plural carrier waves both containing ID information to select a specific information process. The slave unit recognizes the ID information which corresponds to the frequency of the selected carrier wave and performs its operation accordingly. A difference in frequencies of the carrier waves may be used as a type of ID information.
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Citations
10 Claims
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1. A print control apparatus comprising:
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first determining means for determining whether or not data transmitted from an external device is a power-off command; first control means for turning off a power supply to printing means when said determining means determines that the data from the external device is the power-off command; detecting means for detecting a signal transmitted from the external device prior to a data transmission; means for discriminating whether the power supply to the printing means has been turned off by the power-off command from the external device; second control means for, in response to an output of the detecting means, turning on the power supply to the printing means when a discrimination of the discriminating means is negative, and for, even if the signal is transmitted from the external device prior to a data transmission, leaving the power supply off when the discrimination of the discriminating means is positive. - View Dependent Claims (2, 3, 4, 5, 9)
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6. A method for controlling a power supply to printing means comprising the steps of:
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first determining whether or not data transmitted from an external device is a power-off command; first turning off a power supply to said printing means when the data from the external device is determined to be the power-off command; detecting a signal transmitted from the external device prior to a data transmission; discriminating whether the power supply to the printing means has been turned off by the power-off command from the external device; first turning on, in response to a detection of the signal, the power supply to the printing means when a discrimination in the discriminating step is negative; and leaving the power supply off when the discrimination is positive, even if the signal is transmitted from the external device prior to a data transmission. - View Dependent Claims (7, 8, 10)
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Specification