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Control system using plural objects, a programming method therefor, and a peripheral devices control system

  • US 6,108,717 A
  • Filed: 09/04/1996
  • Issued: 08/22/2000
  • Est. Priority Date: 09/06/1995
  • Status: Expired due to Fees
First Claim
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1. A control system used in a computer for controlling a point-of-sale peripheral device connected to an interface port of the computer in accordance with a point-of-sale application object, comprising:

  • a first object that provides a point-of-sale peripheral device independent interface to the point-of-sale application object;

    a second object corresponding to the point-of-sale peripheral device that describes device properties, outputs commands corresponding to methods defined therein and receives asynchronously occurring events from the point-of-sale peripheral device, the device properties and the commands being specific to the point-of-sale peripheral device; and

    an interface object having;

    a first function for communicating the device properties and methods between the first object and the second object; and

    a second function for posting the asynchronously occurring events from the second object to the first object.

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