Power and data interface for peripheral devices
First Claim
1. An interface, for coupling the serial port of a computer to a bar code scanner that requires energy, said interface comprising:
- power transmission means for transferring substantially all of the energy required by the bar code scanner from the serial port to the bar code scanner; and
data transmission means for transferring unformatted pulse data between the bar code scanner and the serial port for processing by the computer.
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Abstract
An interface (12) is disclosed for coupling a peripheral device (18) to the serial port (14) of a computer (16). in one application, the interface allows the serial port to provide the power required by a scanner for operation. To reduce power consumption, the scanner is typically operated in either/a reduced-power, nonscanning mode or a higher power scanning mode. The interface may include an energy storage device (36) for storing energy from the serial port when the scanner is operated in the nonscanning mode and providing energy to the scanner when it is operated in the scanning mode. Thus, a scanner that requires more power than the serial port can provide at any one time can be used. The interface also includes a shutdown circuit (46) that prevents the scanner from being operated in conditions that might lead to the erroneous interpretation of data. Further, an input leakage isolation circuit (48) is included to prevent the discharge of the storage device when the scanner is not in use.
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Citations
7 Claims
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1. An interface, for coupling the serial port of a computer to a bar code scanner that requires energy, said interface comprising:
power transmission means for transferring substantially all of the energy required by the bar code scanner from the serial port to the bar code scanner; and
data transmission means for transferring unformatted pulse data between the bar code scanner and the serial port for processing by the computer.- View Dependent Claims (5, 6)
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2. An interface, for coupling any general purpose port of a computer to a bar code scanner, said general purpose port having a plurality of signal lines, said interface comprising:
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transmission means for transferring power required by the scanner to the scanner from at least one of the plurality of signal lines of the general purpose port, said transmission means including data transmission means for transferring unformatted data from the scanner into the general purpose port, for processing by the computer; and control means for controlling the transfer of power to the scanner from the general purpose port. - View Dependent Claims (3, 7)
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4. An interface, for coupling the serial port of a computer to a magnetic stripe scanner that requires energy, said interface comprising:
power transmission means for transferring substantially all of the energy required by the magnetic stripe scanner from the serial port to the magnetic stripe scanner; and
data transmission means for transferring unformatted pulse data between the magnetic stripe scanner and the serial port for processing by the computer.
Specification