| 摘要 |
A method and apparatus for controlling an electronic display comprises a guest controller transparently linked to an existing host computer system or network. The host computer network is typically a serial network of point-of-sale (POS) electronic cash registers wherein one register functions as the network server. Nevertheless, the various preferred embodiments of the present invention are readily adapted for use with a variety of host computer systems. The guest controller "listens" to information transferred in the host computer system or network and produces output to the electronic display according to predetermined preferences and formats. The guest controller and the electronic display system are manipulated and programmed using existing host input devices, such as a register keypad, without any obvious effect upon the existing computer system or network. Additionally, installation and operation of the guest controller does not require any hardware or software modifications of the existing computer network, other than a link into a communication line. The link may comprise any conventional signal splitter or connection to a serial or parallel port. The method and apparatus are particulary useful to a business providing drive-thru ordering of products, such as a fast-food restaurant.
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